Reversing a bench grinder Plus Bonus video covering Why!
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- čas přidán 27. 08. 2024
- When working with tools Ive seen a lot of people not taking the time to setup their tools to be faster and safer. You want to make all your tools run the same direction to keep from sticking a knife on a spinning tool the wrong way. Here is how you can reverse your bench grinder in 3 minutes
Discovered this method many years ago after I bought a 1800 rpm grinder. . Wanted my flat and profiled 8” leather honing wheels to turn away from me. Shared with my local carving club members but this was pre You Tube. Thanks for sharing to a wider audience.
Thx. Subscribe.
That's so funny man! I rewired my motor, wasn't hard, but all I had to do was flip the base. Love it!
I was looking for a way to put a reverse switch on it when I found this video.
I'm still looking for a way to put a reversing switch on my bench grinder.
My dad's pedestal grinder had a reverse switch on his. Did not need it very often but it sure was handy when you did!
Also his pedestal grinder had separate units.
The grinder part was separate from the motor part with a v-belt between them.
I sure do love that grinder he had!
I wish I had it!!!
You could work on larger pieces without the motor getting in the way!!!
I put a reversing switch on my drill press. Now I can put a grinding wheel or a wire wheel on the drill press and run it in either direction with almost nothing getting in the way!!!
Huge help. I experienced cutting my new leather stropping behold repair before reversing wheel.
Extremely helpful video
Thx. I was afraid it was a little slow. I’m still learning how to shoot these.
You're so smart! Thank you for sharing. Have a blessed day.
Another great video Peter! Thank you! I have been a subscriber for a few weeks now and am working my way through your videos. You do great job of sharing your experience and knowledge. I look forward to your new content.
Great HOW & BRIEF WHY - just what I wanted!!
I just subscribed. I sharpen a lot of knives and use the same set up with the belt grinders. I have 3 cheap 1x30 HF that I also flip on their back so the belt is going away from you. Each one has its own belt so it doesn’t need to be changed. They are lined up on the bench so each machine is the same height etc.
I’ve seen that setup and it can be a fast setup. I only wish the hf sanders we’re really 1/3 hp and better bearings ( noisy) If you ever try a sander with a real 1/3 you wonder how hf rates the hp. How/where do you work? I’m thinking of a series on the different ways you can make money sharpening. Hobby job to full time.
Peter G Just a hobby for me. I just wanted to sharpen my knives which led me to the 1x30. Which led to making knives. Which led to needing a bigger machine. I didn’t want to pay so I built a 2x72. I fell in the rabbit hole and haven’t come out yet. I enjoy seeing the many way to put an edge on something especially your video on the flat bevel knife. Maybe a few videos on repairing broken tips etc.
@@tomp577 thanks for info
I was looking for a way to put a reverse switch on it when I found this video.
I'm still looking for a way to put a reversing switch on my bench grinder.
My dad's pedestal grinder had a reverse switch on his. Did not need it very often but it sure was handy when you did!
Also his pedestal grinder had separate units.
The grinder part was separate from the motor part with a v-belt between them.
I sure do love that grinder he had!
I wish I had it!!!
You could work on larger pieces without the motor getting in the way!!!
I put a reversing switch on my drill press. Now I can put a grinding wheel or a wire wheel on the drill press and run it in either direction with almost nothing getting in the way!!!
I have a 1hp jet bench grinder polisher with long 1”arbors. It’s about 30” total width. I wish it fit in my trailer. Instant start, coasts for almost 5 minutes before stopping. Hard to let go of a tool you love
One is extra hard very fine convolute wheel, the second wheel is Rock Hard Felt wheel with Black Magic compound. Both get 1-2 light passes. No heat is produced with light passes. Heat is bad and you must avoid. grinder is run at 3200 rpm
hi, can you just turn the grinder backwards, instead of taking it apart?
Turning the machine around does it for me simple
Nice & simple, but handy to know. Good video P G.
I expect the time would be the same. And not knowing which wire to cut I really screw it up. Spinning is the safer option for my skill set. But if you know its the way that's better.
With no guards you can just turn the grinder around on the table. Or stand behind it lol.
If you reach over the tool enough times eventually you will catch the inside forearm. I’ve sharpened about 60,000 knives. That a lot of arm cuts IMO.
Nice!
So easy, thanks a million.
Goid idea, safety alway good points
Another great video brother
Legend!
Watch out! Some Chinese grinders like this have the screws INSIDE the motor case and they're loose, so they can fall inside the motor once the nuts are off.
Easier method is to turn the whole grinder 180 with the switch facing to the rear. Use a momentary foot switch instead. No reaching to the rear to access the on/off switch. Spin it back to factory position for standard operation. Less than 30 seconds. Plus you now of the safety feature of the foot switch.
Could you one day make a video on your steps and gear you go through to restore a chipped and damaged knife through to the final hone and strop stage, for a client?
What I don't show in the video is big chip removal. If a lot of metal needs to be removed its fastest to put the apex on the belt so the spine is up. grind the correct contour while grinding away the chip. Then decide if you need to thin the knife before sharpening. Often I talk to the customer about thinning since the knife will look different than when I got it.
@@FREEHAND.WETGRINDER Do you have a video with the typical steps you go through to sharpen a knife, with all your gear. I think you shared something a while back but I can't find it. Thanks for the good work!
I see. the switch is still facing forward but the motor and wheels are reversed 180 degrees causing direction to also reverse from before.
That’s the idea. The top of the wheels turns away from you. Let’s you work on the top
Wow. I was expecting a bunch of wire and electricity mumbo jumbo. Simplicity can easily go over our heads!
Hey PG how did you find the gigantic bushing for the convolute wheel, these things are 3" hole.
MSC industrial. They have an aluminum turned one $$, and a stamped sheet metal one $. Both work the same.
@@FREEHAND.WETGRINDER aaah I see the turned ones are more than the wheel hehe. yea, not worth.
@@Musicpins Call them. I did and the salesman knew where to look in catalog for the cheap stamped style
Isn't there a risk of the spindle lock nuts coming loose while the grinder is being operated? The lock nuts are usually tightened in the opposite direction of wheel spin tp prevent them coming off as per bicycle pedals with a reverse thread on one pedal, so by reversing the direction of spin, lock nuts tightning torque will now be compromised.
It’s still spinning the same but it’s turned around so you can use the switch and still have it spinning away from you
The axle nuts on those grinding wheels are so tight they will not come loose on their own no matter what you do to the wheel itself!
My dad had a grinder that ran in both directions with a switch and those nuts never did come loose. We always had to use a wrench to change them.
What grit stones do you use on this bench grinder? How fast do you run it? Does it not affect the hardness of the blade since it heats the blade?
Yes it will affect it
I did that now the speed doesn't work, what should I do?
Look for loose wire and try revealing back. If you just bought it and can’t find the problem return it.
Hi, what is the model of your bench grinder please 🙏
I have 3 I just bought at Home Depot.
And they charge brands.
@@FREEHAND.WETGRINDER thanks i'am in France and I search a model like this with variator, have you got a link to see the specifications? It's to put wheel paper kit, they say it works with 3000 rpm but in my opinion it's to speed..
It's for personal use Just my kitchen knifes.. Have you ever tried this type of wheels? Thxss from France 🙏🙏🇫🇷
@@Tendeep4 Mine are about 3000 at full and 1800 at low I think. Ive used the 3000 with paper wheels and it's fine. The speed lets you use very light pressure so less heat.
P.S. use as little wax as possible on abrasive wheel.
@@FREEHAND.WETGRINDER
OK thanks a lot..👌👌❤️ I will keep an test on my classic bench grinder. .
Actually I did find a way to run my bench grinder in either direction.
A few years ago the centrifical switch in my bench grinder came loose and slide over so that it would not run unless I push the grinding wheel in One direction or the other.
But when I do push it , it will continue running full speed in the direction that I push it!!!
Normally that's a indication of a bad capacitor, but on some it also means your certificate switch is not working right.
The centrifical switch in any electric motor switches windings from start windings to run windings.
Does this work on all bench grinders? And what model is the bench grinder you are showing?
It should work on most all. Your actually only turning the base 180 deg. The wires should be long enough but I can’t guarantee anything since I don’t know all the different bench grinders. You don’t want to stress the wires so check clockwise and counterclockwise for what’s best. If it’s too tight abort unless you’re confident about adding the wire
Reverse the polarity.
Peter what's the variable speed drive on the kalamazoo and how you like it?
I like it’s not worth the cost. You need a dc motor to go with it. I increased my motor to 1/2 hp. Plenty for my work. But because the speed controller has a brain when I start it on my generator it thinks there is a power problem as it spools up the generator. The fix was to tell the controller I have a 1/4 hp but when loaded double the power. This hits the generator softer. Also I have it start softer to help but I use the brake feature to stop fast for belt changes.
I would not recommend due to cost. It was about $500 -600 for controller and motor
Have you used MDF wheels on bench grinder to sharpen? Pros and Cons??
Yes.
Pros- cheap, Simple, delivers a mirror polish type edge.
Cons- makes lots of heat, only good for mirror polish type edge, slow rate of metal removal when correcting a problem.
This system is fine for the money. But has limits. If it’s for home use and you want to keep it easy/cheap it will work. If you want to sharpen for money it’s one of those tools you will replace with something more efficient/ flexible.
What is the rubberized wheel you use? Do you have a link to where you bought it?
I have two wheels on this grinder. Neither is rubber. The white wheel with black edge is a Felt Wheel w/black magic compound on it. The hardness is called “rock hard” which is between “hard & Flint hard”$
The other wheel is a non woven Scotchbrite wheel. Very fine and hard. My supplier sells it with out any identification so I don’t even know who makes it. $$$
Peter G Thanks. Do you get it from PEC?
P G What dimension is that wheel(non woven ascot rite one), is it 8”, and what is the arbor size? Is there a way to contact you?
Couldn't you just turn the grinder around without switching the base??
That is what most guys do. But use it enough,having to give it the reach around, you will eventually touch your under side forearm on a wheel. And both the wheels give a nasty abrasive burn. Setting it up right only takes a few minutes.
Why don't you grind from the other side?
All my tools turn the same direction. Ever mistakenly touched a knife edge to a polishing wheel when the wheels turning towards the edge? If you do enough knives eventually you will see what that’s like unless all your tools turn the same way. I do about 10,000 knives a year. That provides lots of opportunity’s to stab myself!
how do you reverse a belt sander
Put the motor on the other side of the belt. Perhaps you can swap wiring but I’m not sure.
Why can't you just turn the grinder around 😬
People have asked this many times.
When you use a tool a lot any problems that can cause injury needs to be solved. If you turn it around your reaching around to turn it off and on.
Ever get an abrasive burn on your forearm? It sucks. And it can be fixed in about 10 minutes for free.
Lol I just did it on my delta and it still spins wrong way
It lets you turn it around and not have to reach over to use the off/on switch. It actually doesn’t reverse the direction. But turning it around makes it turn in reverse
@@FREEHAND.WETGRINDER lol! I'm such a clutz. My delta already has the switch in front. What I was wanting was it to spin clockwise instead of the way it comes to stock, counterclockwise. It is a little more complex on the delta because it has guards on each side so one can't just simply turn it around. I got used to this after using my buddies for quite some time. To me, it makes sharping easier. Since I'm here, what way should it be spinning for sharpening? Clockwise or counter?
ShyRage1, clock or counter? It’s up to you. Here is my situation and the right decision for me. I try to hold my knives flat for all tools. It makes freehand sharpening easier to get the right angle on the stones. Example: I use the armature wire on my tormek/wen for proper angle with the knives held flat. Then when I go to the grey scotch bright wheel and felt polishing wheel I again hold knives flat but these wheels at aliens when I line up the sharp edge with the motor housing nearest the wheel. This is also the thinnest motor housing if you’re looking. I find these points with the tormek angle gauge. As the wheels get smaller I have to recheck my mark. But always the knives are flat. Only tool I change the knife angle is the belt sander and the. Finishing grinder that I have mounted on custom stand so I can work under it for seeing results and incase it throws the knife. Remember- I’m working at farmers markets and throwing knives out of the trailer is very bad. Also I’m doing a lot of knives at markets. I have to be efficient. I’m doing 50-100 knives a day 5-6 hr. I put more effort in efficiency than others need to.
Always remember this. There are a lot of ways to achieve a very sharp edge. I’m trying new ideas a lot. It keeps it fun. I use my tooling enough to justify the cost of trying new tools/ stones etc... just yesterday someone read a better way of doing toothy edges. I tried it today on about 20 knives and decided to adjust what they were doing for even better/more consistent results. And once again I’m doing something different. It keeps it from being boring. Look at comments for (Part 1) video
@@FREEHAND.WETGRINDER ok will do. Thanks for the reply
And does this work for any grinder? I think not.
Why not? Really all your doing is turning the switch to the back so you don’t have to reach over the top each time you turn on/off.
I just turn my grinder the other way 😩
Turning it around is a technical solution that is easy but if you use it every day the reach around will have a failure rate higher than I’ll accept. Wheel burns suck, especially on the inside of your forearm.
I don't get it. Why don't you just rotate the whole grinder 180 degrees? Is this a joke?
Because I hate getting burned by spinning wheels when I turn it on and off.
And to the next question you will have- I use this tool all day I turn it on and off 50 times a day.
Thanks for asking.
Seems like a joke to me.
What a stupid idea, the locking nuts on a bench grinder go in the direction so that when the bench grinder is in operation they stay tight and in place, reverse the direction and you risk the wheels coming off and causing an an accident.....a serious accident. Also how is this a "trade secret"? I've worked in an engineering capacity for close to 40 years and NEVER has anyone been stupid enough to do something like this. You sir are a danger to the public posting a video like this.
Thank you for your opinion. Sometimes things are done that have consequences. But in this case you need to think of what is actually going on. First the benefit is when using a bench grinder for knife sharpening you use the top of the wheel not the front face. The direction needs to be reversed. Either by turning the whole unit around. This is the easiest but the switch is now on the back of the grinder. Turning it off and on 100 times a day eventually you will bite your inner forearm. Or if you’re wearing long sleeves it can be far worse. By doing what I showing all that is happening is essentially, the motor stays put, base is rotated 180 deg. Then you turn it to have the switch in the front. The motor will still be turning the same direction just turned around. Hope this helps explain.
Why wouldn't you sharpen from the bottom? Also why wouldn't you just turn the whole thing around if you were dead set on sharpening from the top? The thing about Wheels is no matter where you are if it's spinning at some point they're going to be spinning away and towards you. Everything in this video is strange and unnecessary. I saw this video a while ago and it immediately stopped me from getting advice on CZcams Forever
All my tools are approached with the knife flat and edge away. Having a habit is the safest way to do things that include high speed spinning wheels and sharp knives. Nothing is as exciting as having just one tool spinning the opposite direction.
And as to sharpening from the bottom. I guess you like to sharpen knives with the edge scrapping the metal base, but it isn't my first choice.
Also if you just turn the tool around you have to reach over the spinning tool and hit the switch. Now we both know how easy that is unless your doing it often. Like you "I'm sure" we've almost sharpened 60,000 knives. At least I have. Setting tools up right is better that setting them up wrong.
Perhaps you don't want to get advice on CZcams but trust me Matt you need to get it from somewhere! Seriously!
Never seen anything so stupid in all my life…he turns the belt sander flat to get the reverse direction, but doesn’t realise all that’s needed with the grinder is to turn it round…..Is this an April fool?
Hi john, I’m guessing you don’t sharpen with a bench grinder turned the factory direction just turned around. If you did, often you would know how much it can hurt giving it the “reach around” and rubbing your inside forearm on a wheel. This video is just a tip I use to streamline my process, nothing more. Sorry you didn’t find it helpfully. As a professional sharpener I do about 120-160 knives a day. I’ve heard some guys do double that. Professionals know streamlining is quite important.
That's not reversing it that's turning it around
actually it turns and the off/on stays. I call that turned around. Listen all you need is to use a reverse spinning tool with the switch in front so you don't catch your wrist giving it the reach over 100 times a day.