How Lawn Mower Blades Cut Grass (at 50,000 FRAMES PER SECOND) - Smarter Every Day 196
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- čas přidán 30. 06. 2018
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Destin
#smartereveryday
#lawnmower - Věda a technologie
At 6:03 my stepdad walked in and told me to go mow the front yard
Hey Smarter Everyday. I really Hope you will find my comment. I need ya to rewatch your Rolling. shutter video and consider how is it 4D. I made a comment but it drowned in thousands of others so I will just past IT here. I know you will get what I mean.
"SMARTER EVERY DAY, we think similar, I know you can analyse this topic well so PLEASE do:
Consider this. This is actually badly made 4D video. Assumimg that time is the forth dimension we as the 3D creatures can see only points (like frames or pictures). Like stick is a never ending road for an ant (like time for us). There is infinite amount of dots (points) on the line but only when you see all of them at the same time you can spot the line. The same thing with time. These videos show you not only where the string was at this specific second. It also shows you where it was at every other milisecond. This is an actual 4D !!!"
*Thanks for reminding him
This is no surprize though, i pooped while writing this comment and didnt sign a press release. Get real man! 1.3 million people watched this video so far. It was bound to happen to someone.
Seemed rubbish explanation, seems just brute force.
ZetPerson mmm
walks into barbershop
Destin: you know lawn mowers?
Barber: say no more
i was the 100th like.. youre welcome
I was 323rd, you're welcome
i was not 420, you're not welcome
I was the somewhere between the 76,000th and 77,000th like. And nobody cares 🤷♂️
651st like and very ambivalent
Your sound guy did an awesome job on this one!
Gordon from A Shell In The Pit Audio is amazing. Did you know you can follow him on Spotify? I'd love it if you did. My favorites are "Mountain" and "Rings in Rings in Rings"
open.spotify.com/artist/0HIiXblDOFPXxkuI35wOMx
yeah, ever since that video where he showed how the sound is made, ive appreciated the sound design a lot more in the slowmo videos :D
Great job!! My fathers old gravely walk behind had horrible air flow. 60 years old with years of brush hogging. When we straighten up the cowlings around the perimeter the cut improved tremendously.
@@gregkinney2565 glad it's not just me who noticed that
“Don’t modify your lawn mower”
Project Farm: *heavy breathing*
he even replaced engine oil with banana 🤣
Lol
@projectfarm
Yes 😂😂😂
I understand that reference
My barber can't even cut my hair, let alone give me physics lessons.
My barber get mad Bc idk what tapper means
I only got barber stories from my barber
Just don't let him run a lawn mower across your head and you'll be a-okay
I'd love to see how a scythe cuts grass. Does the curvature of the blade help or is it just for shape ? What's the technique etc
Not sure how the curve helps, if at all. I do know scythes need to be much sharper than a mower blade, like kitchen knife sharp. They also need to be honed very often while in use
the curve is because you kind of swing it around yourself and because your arms draw a curve the blade has to be that too
the grass is getting cut due to the slicing movement
grassynole07
Speed is the key, blade to ground speed.
Fast and consistent, it’s an inertia tool.
Of course the blade should be razor sharp, done with light strokes of a fine grade stone every 4-5 minutes of cutting time.
An impressive tool in the right hands, and the movement is all in the knees and hips.
whatthewhat11
A scythe is slicing tool, like a Katanga.
The curve is so that the scythe blade hits the grass blade at a very small angle, about 10degrees, and slices it.
The cut swathe is less wide than the scythe blade.
It is not an inertia tool: an experienced user can move the blade quite slowly.
This is quite different from the rotary mower blade, which hits the grass blade at about 90degrees and so depends on speed and inertia. The cut swathe is as wide as the blade is long.
I was taught to use a scythe by my father, who (65 years ago) used it for mowing hay, and by the gardener at the Manse who used a scythe to mow the squire’s lawn (A British lawn; grass 0.5 inches).
Don’t think it was invented for cutting lawns .
I love how Destin can turn something as simple as how a lawnmower works into a fascinating hands on science experiment
Because IT IS a fascinating hands on science experiment!
Simple? I think its ex scythe ing!
I just wanted to comment that, things we dont even think about are amazing.
Who said it's simple? You just don't understand the complexity of the world created around you.
@@Luka-xx5ve - it's like someone else did all the thinking and we were just amazed. yea, it happens.
Destin: Mowers don’t cut like scissors.
Reel mowers: Am I a joke to you?
The first thing I thought of when I saw this video last night. I wonder if he is aware of this since making the video.
Haybine.
Beat me to it!!!
Obviously many people thought the same as me. The neighbor across from my parents mows his acre with 5 reel mowers he pulls behind his riding mower that is just pulling. He says it cuts sharper and straighter and from how manicured it always looks I'd have to agree. I think some golf courses use these as well.
@@johnjornod6429 Fairway and greens- Reels..cut more evenly and closer to the ground. Rough - Rotary. The reel mower blades are harder to sharpen and require more overall maintenance from what I have been told.
This is the most dad video I've ever seen
I concur
I feel attacked. 😄
That's why I'm here. This is awesome.
Wait until you come across Reel Low Dad
Heck , just come watch me mow the grass , it's always in slow motion , I'm 60
Haha.
I hope I have even half the humor you have when I get there..
😂💯
LOL
shure46 sucks to be you old man hahaha!
10:00 pm : just one more video
3:00 am : how lawn mower cuts grass
So you have the UTC Timezone
Currently 9:57pm. I know that you've just described my night
@@pags5zonda623 currently 2:56 am est just clicked on this video, the prophecy is true.
Try turning a blue light filter on your device and turning the volume to the lowest setting you can with out making it too hard to hear.
5:01 whoa wait... 5 I thought it's 3. By, I'm going after just this one
This also shows why it's important to having a sharp blade while mowing, ie; cutting the grass. Great series BTW!
I'm glad I saw this near the top. Those blades were embarrassingly dull and rock pitted.
I sharpen my blade at the beginning of the season, and then a couple times during.
Yea Destin is a smart engineer, and he has a workshop to boot, i'm surprised he didn't sharpen his blade for the video xD
Came here to see/say this... some of that grass looked sad post-cut...
The scythe deserves its own segment...I’ve seen people mow a field faster than a weed eater can be fueled and started .
One guy wasn't a guy. Yikes. Hope you're still with us.
The scythe is remorseless
Collaborate with Mr Chickadee on the traditional scythe.
Nothing like a razor sharp, just peened scythe... love mine!
YES
That intro was kind of “Mythbusters” Esque... I like it!!
A Glimpse Inside I think that was the point
That legendary guitar riff!
And the welded plate
Esque
Aubrey Hoes Thank you I made the change. Appreciate it
Just watching that first clip of the mower cutting grass in slo-mo was well worth it. Amazing work, as usual!
You can learn from anyone if you are humble enough to ask. Great job showing this!
I learned something today too... your lawn mower blades are super dull lol
I noticed that to.
It is kinda interesting... at one of my first jobs, the guy I worked for had me use a lawn mower which was later found out to have the blade upside down. It did not cut well, but it did... far better than I ever expected it to.
@@tonysmith5077 *too
I just wanted to kiss those blades with a bench grinder. Or a file. For real.
@@paulstandaert2042 I thought you were me lol
I want to see a chainsaw. It wouldn't be cool in wood(because wood is opaque) but maybe in clear plastic. I have always wanted to see the blade in slow motion tearing away wood chips
A circular saw would be cool too, especially if you could see how each tooth cuts from a different side.
Bigfoot And Bananaman for some insight. I would not say that chainsaw tears away the wood. It's more of a wedge that shaves the wood. Each tooth on the Chain just shaves a little more off as it's pulled through the wood. Similar to a wood plane shaving wood off. Circular saws do the same thing.
I rarely bother to comment on CZcams videos, but I came down here to also request chainsaw footage.
I agree with the chainsaw, including circular saws. My question would be about different chain types (not so common) or different circular saw blade types (more common). I know saw blade types are for rough cut (fast ripping) vs smooth cut (usually slower). I imagine there is a trade off between how much material you can knock off with each tooth VS bogging down the motor and loosing RPM & efficacy.
I also want to see a chainsaw, a real nice gas one and maybe a comparison to a decent battery powered one. I'm curious about a few things.
Great video! Awesome camera work and love the slo-mo the best. Finally got to see how the blades of grass get sucked up then sliced. Mystery solved. Thanks a lot.
No wonder why it’s harder to mow when the grass is wet. The blade can’t lift the grass up because the water/dew adds up to the weight. This is very educational. Thank you for posting this video. I highly appreciate it!
Mine appears to cut fine. I have to stop often to clean the under side or empty the bag and clean the chute. Letting it grow too long between cuts can add to this problem or even be necessary for this to be a problem.
Slow-mo starts at 7:13
Whew, Thank you ~ can't believe it took that long, all that yapping
you have to watch the whole think if you want to appreciate the science of it
thankyou.
MJM Productions I agree 100%, but sometimes I like to watch the slow mo first so I can think about the footage while he discusses it throughout the video.
*Slow-mow.
It's true. Neighbors must mow lawns whenever a camera is rolling. I don't know how that law got on the books but it is what it is.
edit: Also, as a former landscaper: you can get high lift blades for your mower that cut way better than your standard blades.
Where would you find those high lift blades?
Jackson Kotecki Your local helicopter store of course
fuckgoogleplus lmfao
NightHawkInLight hey dude, love your channel
I wonder if it will help my lawn mower not get clogged all the time.
How wonderful! As an engineering student, I always wondered what was going on under the lawn mower engine. Thanks for the remarkable video.
Finally a video about how the blade looks when actually cutting the grass I was trying to find a video like this for.....well years😂
i love you Destin. Your personal hype for figuring stuff out is infectious. These videos, for many reasons, are some of the best pieces of content on the internet.
Hey for fun you should so a slowmo to see if dandelions actually duck under the blade when you mow the lawn 😁
i agree it's weird how they always survive
@@okaylars3248 Try pulling your mower backward over them. They disappear. It's weird but it works.
@@juansolo1617 ... illuminati confirmed
@@okaylars3248 lol it took me a second but that actually sounds perfect.
@@juansolo1617 ahahaha
Excellent video to show how important it is to keep your mower blades sharp.
I didn’t know I needed this video in my life. 🤔😂
Lets do a collaboration on a stump grinder. We can show how the teeth disintegrate the wood as they grind the stump away. That would be perfect for a slow mow sequence. I have a brand new one we can use. I've done a few heavy equipment videos like that and have plenty of gear to test out.
Also your retaining wall videos saved my backyard.
yes please
That would be awesome
Would be awesome
Throw in a Chainsaw and hedge trimmer as well, while you're at it. :)
Anyone else wanna see a weed whacker in slow motion?
Yes
Yes
Yes
Jup, with wire and blade please :)
Not just wire and blade but there are two types of wire, round and the twisted square type. Why is one better then the other?
Definitely earned my subscription..I love the "How things work" ...never knew that and I've been cutting for years
Another great video, thanks. At 7:23 if you look close at the left over grass (or shorter old grass) after the cut, your blade is ripping the grass because its a dull blade. Thats how the grass gets the brown jagged ends because of a dull blade which opens the door to grass disease and harder / longer to heal, so your causing unhealthy grass as well. Professionals may carry several blades with them and even switch them out during the busy day of mowing if they see this effect.
Remember the old trick where you unfold a newspaper and lay it across half a ruler. If you hit the ruler fast enough you could break the ruler in half. The speed you hit the ruler at was just too fast for the newspaper to lift up, so the ruler broke. This is how lawnmower blades work. It's speed, not lift. I mean, the lift does help in various ways, but it's certainly not a pivotal part of the process. Please do a video with perfectly flat and straight blades and see what happens. I bet you it'll cut grass pretty well.
Destin, I think you got this one wrong. I agree with Chrispm84. I assert that this is a turbulence + momentum phenomenon. Not a suction one.
The little blades of grass are whipping around in the turbulence and eventually get hit by the mower blade. The mower blade is moving so quickly that the grass can't move out of the way (due to momentum) and get chopped.
I would also suspect that some grass blades require two or more hits before they are chopped down to the mower blade's height.
david garlisch I think Destin is over thinking this. Where I live we don't use lawn mowers but grass cutters. It's basically a high speed fan on a stick that spins a thick nylon(can use steel blades but nylon strings are safer since you arent in danger of a blade chipping) very fast to cut grass and it cuts pretty well. No suction, no wind.
I'd also point out that when using larger farm equipment (good ole bush hog), those blades are elongated chunks of iron swiveling around under a shroud. I don't think there is much of any lift in that equation. It's more like bludgeoning the grass until it short.
Yeah I think it's more of an inertia effect
Chrispm84 Well yes, but what I believe the lift does beside help a little with the cut is eject the grass so is "clean" enough to keep cutting without interference. Thought I've seen mowers with straight blades.
I just watched a 10 minute video about mowing grass and didn't get bored. You know how to make a good video!! @smarter every day
JakerMB I did tho
lol I thought I was crazy trying to research the science behind how lawnmowers cut grass. Nice to know someone else out there is doing the same. This all started out because I was trying to figure out what the best grindangle would be for cutting the lawn. It would be nice to have a video on The different angles and how it affects cutting the grass. Thanks keep up the good work
I’m 25 and younger than both you and your barber and I knew that about lawnmowers from a fairly young age. I’m glad you’re still learning and finding new information without being embarrassed in any capacity about little facts you may not have considered because that’s what I aim to do when I’m your age and beyond.
This isn’t a condescending comment either, I’m both surprised I knew something you didn’t and also inspired by your motivation to keep learning even though your career and studies have left gaps that you’re still figuring out. Keep it up, I love seeing these videos because I don’t know everything either lol
You just went with your assumption that your hypothesis was correct; that the blade wing is what makes it work. You never tested it without.
Yes that is what I thought. Please cut the wings and compare the results to show the effect. At 5:50 I thought the grass could also be lifted by its own stiffness.
He doesn’t have to because it’s not an assumption, it’s fact.
Then show me.
Highstranger951 that is not how science works. Hypotheses are considered potentially factually true after empirical testing, not before.
Forssa1 do your research guys.
Well, the most obvious thing to study next is the weed wacker, but I'm curious about the garden hose sprayer. You know, the one with the dial that you can use to switch between spray options like, shower, jet, and mist. I'd like to see an explanation of how the water breaks up and spreads out as it travels through the air.
You most likely put more pressure for jet with a different pattern and less pressure for mist with a different pattern
I agree - the weed whacker (also known as a line trimmer or whipper snipper) would be a great second edition to this series.
Not exactly. Spray Systems does the science behind sprayers. The shape of the cavity is very carefully designed to get different spray patterns. A lot more to it than just pressure like turbulence and flow regimes.
Jonathan Tash I want to see the weed wacker
You always study whackers
Cool video. Always thought the bent up tabs at the back of the blades were to help expel the grass. Now I know better, thanks!
You’re such an interesting, intelligent CZcamsr. So fun watching all your videos.
Also this one is called - SlowMo-wing.
Damnit
Kris Bendix i see what you did there 😃😂
Get out.
why do people hate puns? I love them
I learned that mowers pulled the grass up from "Honey I Shrunk the Kids"
HaunterOfKanto that’s a good movie 🍿
Great point, well recognised! And a fun example too :)
It cuts because the grass is wet and sticks to the super fast blades. Flymo lawn mowers blow the grass down.
Same 😁
Lawn series: Does a drop spreader spread more fertilizer when it's full (compared to the last quarter before empty)?
Why do some garden hoses kink and others don't?
Does a sprinkler apply water evenly, or more in some areas?
Is a reel mower like a pair of scissors?
How does an aerator really let the air flow in, although the holes are far apart?
How can you reduce evaporation on your lawn?
How does cutting your awn to different heights affect evaporation, spreading of grass plants, wear resistance, weeds...
Out of all the people on CZcams I would want to meet you the most. You seem like a really cool guy to talk to!
Why didn't you use smoke to show the airflow?
NINJABDUDE probably too much turbulent air around the mower from ambient wind, not to mention he's shooting the video at home so what would he use for smoke? He would probably have to use smoke balls which would get sucked up into the blades unless anchored. The grass does a well enough job at showing airflow.
NINJABDUDE yea, or put babypowder or something in the grass and see it get lifted out.
I was going to suggest explosives and rupert gum drops.
NINJABDUDE that's a cool idea but perhaps Hunter is right.
Yeah Destin, why didn’t you make a better video?!?
A weed whacker has no vacuum so I wonder if the speed of the strings makes up for the need for a vacuum by just hitting the grass blades extremely fast. Also an analyzation of different weed whackers in slow motion would be awesome to watch
The purpose of a string trimmer is to be portable but for small areas. The line wears out, but will not cut your shoes...
That is the trade off
The OTHER aspect of it is that a weedeater can get into DETAIL spots where you CANNOT drive or push a mower easily
So it is truly for trimming. This is why commercial outfits use a big mower - but generally have a team of followers trimming the walks and edges
Have you ever seen a Hover Lawn Mower? I think they came around some Where in the 60's. The lawnmower basically hovered over the grass, like floated over the grass & cut the grass @ the same time. Super maneuverable when it's running.
Something interesting I learned from this. Thank you.
I can’t believe I just watched a 10 minute video about mowing. I also can’t believe I was intrigued. You sir are my favorite hillbilly in the world 😂 and the world needs more of you.
Roll Tide.
The blade does create 'lift' (read airflow) but it's not required to cut the grass, or else line trimmers wouldn't work. The grass breaks when the blade speed is high enough that the grass can't get out of its way (inertia). The bent blade is a fan that lifts & blows the cut grass into the catcher or out a chute. That effect stops when the bent bit wears out.
I am highly grateful for this video. Thank you
Ok two things if you ever think about revisiting this. You should set like a control where you get blades without the tab and see what kind of difference there is and also I wanna know how the old push mowers work the ones with the spiral blade
Cylinder mowers (called reel mowers in the US) have opposing blades. One is fixed to the frame, the other is wrapped around the cylinder (usually 5 or more separate blades) and as they rotate they shear the grass between them selves and the fixed blade. They make a much neater cut, and for that reason are used on fine lawns, putting greens, tennis courts etc.
Spencer Wilton my first mower. No ethanol!
I was going to say the same thing. Reel lawnmowers have been around, I'd say, for more than 100 years. No, I can't provide a citation. They typically have a grass catcher on the back. For a push type lawnmower the reel is driven by the wheels via a ratchet system of gears so it can continue to spin even when the wheels were stopped. The sound of the ratchet was a sure sound of summer many years ago.
Even today, the grounds keepers for golf courses use reel type lawn mowers on the greens. A rotary blade just wouldn't do, maybe on the fairways but not the greens.
oooh. thank you!
They also get wracked but non-grass (sticks, rocks, toys, etc.) running through them more easily and more labor intensive, is also why they are better suited to highly manicured small areas.
Also sickle bar mowers and similar used for harvesting hay (just drops it instead of pulverizing).
Oh you have to do how a chainsaw blade!!!!!! Please please please do a chainsaw blade!!!love this series idea.
Daniel Bisagni that was my first thought too
Daniel Bisagni going with the grain, vs against
Especially looking into cutting edge angles and cutting depth and why they should be adjusted for the type of timber being cut.
A saw chain is an intricate mechanism made of many moving parts - that having been said, there are many videos on how to sharp a chainsaw chain - it is complex and I will not detail it here because it has been talked about elsewhere, most notably by "Swedish Homestead" at YT
Tanner Beverley they cut trees down across grain I belive
Love your channel. Thanks for putting your advertisement at the end of your video I enjoyed all 10:27 minutes worth.
Awesome video, and found just in time to save me from cutting the front off of my lawnmower in search of similar knowledge.
1.7K blades of grass have disliked this video.
They are very edgy, it seems.
Nah, they are just being grass.
lol
939+
I think there are so many cow watching this and dislike it.
"No Grass is harmed during this video?"
Kedar Nimbalkar that's funny
Tell that to my ripped meat eating friends that dont like u messing w there food’s food
This video illustrates the reason for a sharp well designed blade. As well the need for a well designed deck. I have had a number of lawn mowers over the decades. My 15 year old Ariens has the best suction, pick and even cut.
How did you not know this, I was just looking for a video of a dull lawnmower cutting, to se what happens 😊
I learned so many new things from this video!! Looved it man. Keep it up.
What about a manual lawn mower with no engine?
Matthew Shultz that uses the same principle as scissors or the two blade method
That's a rotating scissor/shear at work there.
Do you mean like an old fashioned push mower?
Here’s a video of mine cutting paper czcams.com/video/qxDO6aSbSGM/video.html
They're called reel mowers. They have a back edge and work like the scissors do.
“You’ve spent a ton of your life on a lawn mower”
New Yorkers: am I a joke to you
New Yorker: what's a lawn?
Grass? isn't that something you buy
I like in NY on a farm and mow 10 plus hours a week
Gavin Kvinlaug NYC
@@alejandrosalazar6975 ok but u didn't specify
Yea dont lump the rest of the state in with the "California of the east" (nyc is its own mess that ruins it for the whole state.)
Hey Destin look into reel mowers, they work just like scissors , the best way to cut grass
A chainsaw blade/chain seems like it has some interesting science behind it. Any thoughts?
RumbleLab
Really fast sharp thingies 👍
RumbleLab link the time
RumbleLab it does. It cuts on the top not the side of chain for 1. Teeth alternate so cuts straight and not pull to the side. Ramps in between teeth so chain only cuts what it can handle without digging in and jamming. Plus chain has to remove the debris as you cut. Low kick back chains have higher ramps so you can't cut as much with each pass and won't jam as hard if it does get caught. That's based on my understanding. Sorry if I mis spoke about something
Yeah it would be interesting to watch the material being pulled out
Joe Smith isn't there a link that "slices" followed by a link that "digs" almost like a knife and a chisel?
Lawnmower blade, blade of grass
Mowing is actually a sword fight with nature
Great insight into lawn mower physics. Thanks. Subscribed! if you have not done so yet, you could explore the brushcutter/string trimmer Oregon mulching blade and the Chapello M4 or Flexitiller harrowing /tilthing blades. Amazing tools.
What a fantastic video thanks fellas
I love this series! If you want more info on this I can take you to the engineering department of Toro and take you behind the scenes. We could also do a series on Heavy equipment with Volvo.
volvo sucks.... cat is better
Thank you DMZ!
This would be neato
I was just going to comment that he should contact folks that manufacture lawn mowers and talk to a mower design engineer. Quit guessing and ask the people who already know.
Please, make this happen!!
Scythes.
Sven Servette i was literally looking at if I could buy a scythe in the next tab lol x
like cutting tomatoes. its a slicing motion instead of a chopping motion. Just watch a video on them and watch the way it moves through the grass and the way the taper interacts with the grass.
Cheesus Sliced what's the difference between those two? Genuine question
Tori Ko between slicing and chopping? Slicing uses the sharpness of blade with minimal force to cut the material with an extended motion. Sliding the edge of the blade across something, all the energy being applied parallel to the cut. When chopping, the energy is applied perpendicular to the direction of the slice, and its a weight or force applied directly to the knife to push the blade through something, using only one part of the blade. Axes chop, scythes slice. In terms of food again, you can chop through bones with a meat cleaver, or slice it from the bones with a boner knife
Edit: a way to think of the kinetic energy difference is pulleys. If you use a series of pulleys, you achieve the same lift with less force but longer motions, while without the pulleys its shorter motions but more force for the same lift
Cheesus Sliced thanks!
I do have a mover that works like a hair buzzer, also a modernized push style mower and one that uses cables like a weedwaker. This video has got me thinking of a mover that has blades going in opposing directions.
That slow motion camera is so amazing!
You know what you have to do. Make your own blades without the lift tab. Check the slow mo and see if the grass doesn't stand up. Shouldn't be too hard it's just a flat slab of steel.
VicMorrowsGhost better to just heat and hammer the lift edge down. Balance is very important for those blades, mainly for the integrity of the blade deck. The vibration of an unbalanced blade will eventually rip the pulleys out of the deck.
Symmetrically grinding opposing blade faces across a central axis is as difficult as it sounds. Add into that keeping it balanced as the previous comment noted does not make it any easier.
VicMorrowsGhost you can buy mulching blades like that. No tabs. I've had stupid employees put blades on upside down and could barely tell a difference. Rpm fast enough to still cut.
Just go buy some
He also should make a clear deck to let it do it's thing properly. Opening the hatch like that will effect the upward flow, wouldn't it?
It's not to "pull the grass up." The lift is designed to expel/discharge the clippings, unlike mulching blades, that have less of the lifting force and are designed to make secondary cuts.
Wow that’s actually pretty awesome! I never knew that. Very cool 👍🏻👍🏻
I'd love to see that footage again with the tabs bent down to a neutral position. 😀
It would still cut, the tabs simply create air flow to move the clipping out of the deck. It’s just speed, same how a sword cuts. This video is false.
You have just confirmed my theory which I have thought about once a week every week from March through November for about an hour since I was 12.
Clay Thomas same
Haha yea
I felt itchy for you... 0:30
Justin Schmidt hahe
I'm allergic to grass and all I could do is cringe and scratch lol
Lol
Yes
Grass makes me itch like crazy. I think it may be because of the pollin
Good tip on how grass is cut.i service lawns and larger water sheds and drainage culverts.i am always looking on how to cut better and leaving the job looking good.
Your videos rock ur a smart man and it's good you share that knowledge. I appreciate it ...
I'm not entirely convinced that the upward force from the lawnmower blade plays an especially significant role in the cutting part of mowing. Certainly it's useful overall, since it's what lets the lawnmower collect the grass in a bag or in the case of mulching mowers, suck it up so it gets hit by the blades again and again until it's shredded into little pieces. However, an object moving at 200 MPH will rip or cut through grass regardless of airflow. There's just too much friction against the edge of the blade and inertia making the grass fold over onto the blade as it moves past for there to be any chance of it somehow whipping back around and sliding under the blade intact.
I'd like to see a control test with the curved lifting portions cut off to give a flat blade. Also, what if you installed the blade upside down so that it provided down force? A comparison of the quality of the lawn cut under these conditions would be very interesting! This would test the assumption that the lifting blade pulls flattened blades back up straight again so they're cut to the same length as all the others. If this is the case, doing a comparison immediately after mowing might be a mistake since any blades that were flattened by the mower may still be laying flat. Better to give it 24 hours after mowing for the wind to straighten them up again first.
As far as I can tell, the lifting lawn mower blade is a relatively new invention. Before this, blades were presumably flat, though sadly I can't find pictures of old lawn mower blades anywhere on Google. Apparently there are no antique lawn mower blade collectors for some reason.
Now, what about cylinder blade lawn mowers? The geometry on those makes no sense to me. How do they work?
cylinder blade lawn mowers' paddles/blades push grass into another blade and operate like sissors in that respect.
I can tell you as a Lawn Maintenance Provider that the lifting tab on the back of the blade makes a HUGE difference as to how well that blade will cut. If I use a "Low" lifting tab type of blade, the grass doesn't get cut as evenly or I have to make several passes over the lawn. The "High" lift tabs allow me to make a single pass. Also note that the "High-end" Commercial mower have tall decks (5"+) to maximize airflow under the deck to provide that perfect cut. Great video as always!
The old rotary mowers cut like a pair of scissors as he explained in the video (cutting blade and bed knife blade), but there are commercial mowers that are in the Flail Mower category. They have a ton of little blades on a shaft/drum that spins and cuts grass like a knife cutting paper pretty heavy duty machines.
i don't necessarly agree but i upvoted it for visibility.
it is interesting to answer these questions in more depth.
7:15 doesn't look like it cuts the grass right now.
also the cutting efficiency heavily relies on the bility of the cut thing being able to move away. if you jus a grass blade from the side it will be way easier.
Yes it is. Actually one of the most important aspects besides sharp blades. Yes it will cut, but cutting ALL the grass is the end game. And airflow will provide that. If the grass blades aren't lifted up they will just lay down never making contact with the mower blade. 26 years commercial mowing experience here.
Reel type lawn mowers do shear like scissors....
They have rotating blades that shear against a bed knjfe....
Okie Male hahahaha I was thinking the same thing when he was talking about it....... he lost his point right away in the first minute 😂
Cool video en sound effect btw
They also make sickle mowers that work like barbers clippers.
Okie Male , and boy! do they do a good job.!
I was thinking the exact thing about reel mowers when he was talking about that
Wow thanks for going out of your way on making the video.
Anyone ever "mow" or "weedeat" with a stick as a little kid?
My name's not important: like in the lines of the driveway?
@@noahshaw8247 yeah, or just tall grass next to an old building 😂
Had to be kinda tall, so on the sideways didn't work the best
yeah i learned how to actually weed eat because we have a landscaping business
I like beating weeds with sticks
I had fencing wire for that! Mainly bigger weeds. Then I sharpened some steel flat bar to do the same thing.
That Mythbusters reference lol
Do not click this link, it's just self-promoting spam to a trash song.
However, I did not notice a mythbusters reference... Anyone care to enlighten me?
Indeed that is spam.
at 0:25-0:28 the part with the name of the channel on a metal plate is just like the way Mythbusters would do a transition. And if I am not mistaken the music itself is the same (or I have been watching SED for so long that his music has been embedded in my brain and I no longer can tell the difference).
Ahh! Good catch, you're totally right, very mythbusters-esque.
Gavers23 No, that’s definitely Mythbusters music. Makes me happy to hear it again :’)
A grazing cow will also lift and chop the grass leaving a nice short lawn. Thank goodness they don't spin at 200 mph.
anasmrright what, are you afraid of lawn mowers?
ROFL!! 😂
If it did, make sure to dump buckets of chocolate over it first
anasmrright , You ain't ever been in a twister, have ya!? 😁
Twister (1996) Anyone? Cows do spin in the air. Sometimes multiple times. (The 200 mph moo)
Lawn mooers
In the slow motion we can the grass is being lifted up! That's Awesome filming!
This was a great explanation in engineerspeak for something that I always thought I knew intuitively... This. Was. Great. 😁
5:35 Your Welcome :)
HotDog thanks
Thanks
God bless you son
You're
God bless all but your spelling man
Slow mow
That is one awesome comment!
Bwhahahaha! I see what you did there.
Not as slow as 343,000, which I've seen
No.
lawrence offley Yes.
Great video! There is one mower that works like a pair of shears. The rotary blade mowers have two opposing blades. One is a straight stationary blade and the other rotates. That would make for a good slow motion video.
I’d love to see a deep dive into scythes.
High speed, showing how experienced cutters hold their angle, etc…
Youre barber is a lowkey mechanical engineer. Times must be tough
Maybe being a barber was his true passion or just a more chill job as you get older and have acquired a hefty retirement already.
or times are hard too lol
It's like Mike Rowe says. There's no reason why a plumber can't quote Friedrich Nietzsche, and there's no reason a philosopher can't fix his own bathroom.
Reel mowers cut like a pair of scissors, you could go to a golf course and get high speed video of them mowing a green.
I think he's too young to know about reel mowers. 🙂
Reel mowers are still very much a thing.
My uncle has a couple antique ones too
BW Tractors They are practically extinct. Only in a few specialized applications like golf courses and often used by the Amish.
LTVoyager they're also often used on pro ball stadiums with real grass. They're not extinct, just specialized. Because specialized places are the only ones with the training and maintenance department to keep them running effectively
BW Tractors I call that nearly extinct. You can still by buggy whips also...
0:18 destin’s energy is so contagious it reminds me of me as a young kid. I want that curiosity back
Your vids are the best- YOU BRING OUT THE SMARTER IN ALL UF US!!!
THANKS FOR THAT😉👍👍
How does a weed wacker work
On it. Several people will probably try to scoop me on this one, but I have an interesting idea for it.
If you know any tool companies wanting to partner let me know.
Literally was just about to comment this! Great suggestion 😊
Thank you and I like your videos
It's simple. It wacks the weed
Yes. Weed whacker doesn’t have lift tabs, it’s just a whip what manner of sorcery is this? Also what’s better the weed whackers that use line, or the ones that have those plastic blades
Using smoke would probably visualize it better
the mower acts like a leaf-blower on everything outside the deck - the air-pressure is all outward, not in/upward. It doesn't draw smoke in, it blows it away. Once you park it over the smoke, it's in a low-pressure center by the pivot, but no uncut grass ever reaches there since the grass is cut by the outermost edge of the blades.
Love your videos. I am old enough to remember that in the early 1960s, rotary mowers had flat blades because they didn't have catchers. In fact I flatten mine with a sledge hammer so there is less drag on the motor and less grass choking up the chute where the catcher isn't attached, and they still mow fine. Furthermore whippersnippers use just inertial cutting. So I don't think the suction thing is that important. Maybe it gives a cleaner cut at lower speeds?? But those old mowers with flat blades cut just fine.
This guy over complicated the matter. He quotes some simple law of physics tried to makes us think he got some higher academic achievement.
Loved this video because that's what I do for a living. One question I have is "How does the self-drive speed affect the cutting quality?" I have a lawn mower that seems to go to fast and so the cut is sometimes hit and miss with some long strands of grass being missed. How could that ratio be changed? How can you slow the self-drive speed down? Have you ever had this problem?