Metal Lathe Tutorial 8: Concentricity
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- čas přidán 3. 08. 2024
- This is Lathe Skills, a multi-part series to help you learn basic machine shop work. Exclusive videos, drawings, models & plans available on Patreon!
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Came here to say this lady is the greatest teacher of all things! Seems I'm not the only one that feels that way! Imagine a world where ALL teachers are as great as she is!
My dad tried to teach this craft to me as a young lad. You are much more patient than he was! Thank you, your awesome in your teaching skill!!!!!
In Germany the Lathe dog is called "Dreh-herz" by the way. Cool videos, I like it.
You explain this so perfectly 😀
I havent used a lathe in over 50 years and am buying one soon (an oldie but goodie) . I have been watching your tutorials to learn (or relearn) what I need to know. I love the fact you speak clearly, and simply, and the length of the video is long enough to cover subject matter, but not so long, you get bored (no pun intended)... Keep up the good work, as this old dog loves learning new tricks....
Great vid. Your teaching IS the best on U- Tube. Thank you Quinn. Deep respect.
Thank you! ☺️
Nicely done.....like Abom appearance too
Nice Abom reference. I don't even own a lathe, but it's oddly fascinating to see people indicate a chucked up part.
It is very satisfying. 😁
@@Blondihacks indeed, indicating a part is... pretty cool to be able to do. :)
One day, I'll own a lathe, and some indicators, and can get back to doing this again. :)
You are a very good teacher. Very intelligent and with a great vocabulary. You get the point across extremely well with fewer words. Fantastic work 👍👍👍👍👍👍
I just bought a Myford lathe (my first entry into a machine lathe. I really appreciate the videos. I've learned so much from you. Thanks!!!
Thank you. You’re a great teacher.
I found this VERY helpful! I watched small amounts of three very waffley videos before i realized they weren’t explaining it! 😂And then found this one, which was worth every single word.
I don’t lathe, because i don’t have a lathe, but i still watch a lot of lathe stuff because i love it and hopefully one day i will have, said lathe. Until then, i am filling my noodle (upper noodle, not lower) with useful information! This was wonderful thank you. 😂🙏🏽
Although I know most of the info in the videos, I enjoy watching you work and am impressed with your ability to teach and of course I learn a little too. Thanks Blondihacks!
Seven videos in and I love your brain!!!
The way you explain everything so concisely is like turning between centres... magical
Best explanation i came across on the topic
Your videos are just excellent! Congratulations! Your explanations are extremely clear and precise! Well done!
You explain things very well. You have enlightened me on several topics that I have struggled with. Thank you for your tutorials 👍
Enjoying your videos. They are "magical". Thanks
I am learning so much from you. You have very good at explaining this.
I am also she is definitely a great teacher.
I have a silly question, were you or are you a teacher? You have a clear and concise way of getting the information out in a very understandable way.
Yeah, my impression exactly. Very clearly explained.
Thank you, that’s very kind! I’m not a teacher, just passionate about trying to help people understand machining and other topics. Thanks for watching and taking the time write!
You're welcome,your and Abom's videos have been very helpful with machining a model steam engine. Thanks again and keep doing what you do.
@@steveshindeldecker42 I love Adam's videos too. I've learned a ton from him!
I have to disagree with you. You are in fact a natural teacher and it shows.
Well there little Lady I tip my hat to your skills Great Video series 👍
As a certain frontman once sang out: "I wish I knew you when I was young"...Subscribed.
Thanks for the sub! 😀
Es muy facil de entender como están estructurados tus videos hay tanto que aprender en este oficio gracias Quinn por compartir tus conocimientos un abrazo desde Chile
Just love this. As a newbie your amazing! Just starting watchmaking so I’ll be turning on a micro scale. :).
Terrific. Thank you
Magnificent explanation!
Thanks! 😁
Excellent Refresher!
It took me a long time to pick up on the accent. I am in WA state, and people in the Pacific Northwest of the USA have some of the best voices. Blondihacks has a very "Seattle" or "California" accent, but it turns out that she is Canadian. Nicely done Blondihacks. Your broadcast skills are very good. The Canadian accent is almost identical, but a couple words are said differently, and that's one of the giveaways. Canadian's speak more similar to British English speaking people, with more original word pronunciations.
Great video, thanks for sharing.
I've got that Jungle Book song stuck in my head now, but it's "Concentricity, simple concentricity..."
While shooting that, I said the word so many times it lost all meaning.
Thank you forvthe refresher.
This really gives me the itch to dig out my mini-lathe and get turning again. Also, nice Abom79 cameo :)
He would be unimpressed with my four jaw chuck skills. ;-)
@@somebodyelse6673 During the Four Jaw Challenge at last year's Bar-Z Bash, he did actually say "I'm not used to these tiny chuck keys". It's on CZcams somewhere...
Thanks Quinn
Thanks!!! Very nice content!!!
Great content
Very well done. I'm your newest subscriber.
Thanks very much for the kind words, and for subscribing!
I notice that when you use a lathe key, drawbar wrench etc. your hand never moves far from it as long as it's engaged. I don't know much, but that is one piece of wisdom I always try to pass on, learned the hard way! Thanks for your good works!
Very well explained, great video, I think I need to suck it up and start using my 4-jaw more. 👍🏻
It’s fun once it becomes second nature.
I love that Limor Fried is one of your patrons!!! :)
She was, anyway. She dropped off recently, but I was glad for her support for a while. 😁
Blondihacks well, perhaps I'll eventually get around to creating a patreon account, and I can fill in where she left off. :)
I love this series - very well done!
However, one little nit: When you're describing how concentricity is lost, you mention "relationship to the surface of the part" very briefly. You should have also pointed out that you're also doomed because the surface that you're clamping to isn't concentric to the machined surface of the part.
1st year apprentice here...Thanks Blondi
I am learning so much from your videos - and I don't even have a lathe. Yet....
This old Tony loves his 4 jaw
This Old Tony is the master. 😀
one thing about loosing concentricity is also that raw material like round stock is rarely really round or straight but if the surface was turned round then the change if loss of concentricity would be negable or nor non
Awsome Awsome
Love the videos, thank you. When you chucked the rectangular L shaped piece, how would you insure it is centered properly. Very new to metal lathes. Thanks for the reply.
Super usefull, thank you.
Is there a kind of a kit for the minilathe for the last solution with the plate, and the "holder" mecanism instead og the chuck, one can buy if we want to make shafts like you show here?
Great video as usual! Can you possibly explain how 4 jaw self centering chucks work?
Hi Quinn. Maybe I misunderstood but in your "what to buy for newbies" video you said a 4 jaw chuck is an essential. I noticed you seem to always use a 3 jaw. How come you're not using a 4 jaw in all these videos so far? Thank you. I love how informative you've been and I admire your intelligence.
I agree with others you should at least mention collet chucks. The are actually the best from both worlds with repeatability and convenience in one. My father in law tool and die place uses those on Hardinge lathes for making production die parts. The only downside is the cost here as you need a lot of collets for different sizes and they don’t go as high in sizing as you chuck it up in the 3 or 4 jaw chuks.
8 episodes in before I managed to find a possible dumb question to ask. That is consistently impressive, you´re a very good teacher ! :) Likely premature for me to do, but I like comparing abilities between known by name horses; Will outer concentricity be able to become "truly" circular if shaped by the means of a todays higher precision CAD controlled XYZ router ? (surface with integrated male axle tap designs, as ex)
I feel that this video is missing the other option which is a collet chuck of some description as is used in most Clickspring clockmaking videos.
Yep, there are many other options. There are also adjustable backplate chucks, machinable soft jaws, and high precision scroll chucks, for example. You gotta draw the line somewhere in any instructional video though, to keep it concise. I’m focusing for now on the basics that any hobbyist will have access to.
Not to mention the use of superglue as a machining essential. *g*
Thank you so much Quinn for explaining the leave dog I didn't understand why they called it a dog I understood it was a dog leg looking thing. But I didn't understand what its purpose was thank you so so much. I've learned so much from you thank you. I did purchase the lathe and the mill. I hope to be making chips and the next 3 to 4 weeks.
P.S. do you have any videos you can recommend on lathe and Mill placement in my garage it's 25 x 20 and pretty much that's all that will be done inside of it I have a welding shop that's a 25 by 20 outside my garage. Where on my welding grinding takes place. Any videos or suggestions would be much appreciated.
I talk about lathe placement a bit in my import lathe buying guide. Basically you need space to the left and behind it. Mills go well in a corner at a 45° angle because the table needs room to move but the back of the mill is narrow.
@@Blondihacks thank you so much. If I sign up right now for $2 a month can I raise it to $10 a month after I go back to work next week. Can I do that as a patreon supporter I've never done this before.
@@1ton4god You bet! You can change your pledge amount at any time. Any amount people can afford is always appreciated! ❤️
👍👍👍👍👍👍👍👍
When center drilling the stock for turning between centers, how do you ensure that the points line up? I know that theoretically we are supposed to be turning around the line between the two points, which is unique, but aren’t we actually seating the centers within 60º cones? If they aren’t symmetrical about the line between their end points, won’t we have problems seating the stock when we get to the turning stage?
😸
Hi, video are really great, does a lathe collet help with Concentricity?
Inquiry: I do have both 3- & 4-jaw chucks but my primary is the 3-jaw. When I want to achieve "Concentricity" with my 3-jaw, I use a "sharpie" and place an index mark on the workpiece and one of the jaws so when the workpiece is placed back in the chuck, it's positioned in the same relative position as when it removed. Can you comment please?
I have a small doubt in case of three jaw chuck suppose after achieving the concentricity I do centre drill on the job and remove it then put it again in the three jaw chuck and support it with tailstock will i achieve the same concentricity as it was in the beginning?
thank you again ... Would have like to know how long it actually took you to regain concentricity with the 4 jaw Chuck 'Norris' ...
Question, if I turn down a length of stock long enough to flip it and re-chuck on that turned down surface, would concentricity be repeated on a 3 jaw chuck?
She knows :)
I like your lesson what lathe brand we need for workshop for small and medium project
Don't forget 5c collet closers :p
Could you theoretically turn a concentric part and mount it on the concentric end which you prepared and then start the piece? And then start working from the other end?
You mean in a 3-jaw? This will _help_ ... however, it's still not as precise as dialing something in on a 4-jaw, generally speaking. You will probably get better concentricity clamping to whatever you just turned than to the initial shape of the part, though.
Edited to add: I _think_ the above is true. I'm a novice, though, so take this with a grain of salt. :)
Excuse a noob question, but why don't the three-jaw chucks have a center built in the middle of them, that could repeat the center of the work when used?
Hello blonde! I am a hobbyist machinist and I have a question: I need to perform a reaming operation on an already drilled pipe. I've heard that I should center the holes on both ends and disregard the centering of the outside. Is this correct? How is this operation performed? Thanks for the content!
Hello! Do you have any tutorial on how to make a faceplate/lathe dog plate?
Greetings from Guatemala!
So then can you maintain concentricity by holding a dead center in the three jaw, using a dog, and then a live center in the tail stock?
D Jaco That’s a great question! The answer is “sometimes”. If you use an unhardened dead center in the three jaw, then turn down the point to make it concentric, you can now turn between centers with it. This is something people often do to save swapping chucks. You have to turn a fresh point on the center every time you do it, because you have to reacquire concentricity each time you put something in a 3-jaw.
No, the three jaw will still make in non concentric. The centers maintain concentricity. Dogs are not used with chucks.
@@witzed1 Blondiehacks has it correct. If you turn a scrap to a 'dead center' point in the 3-jaw, it is as concentric as your spindle bearings go. Then you use that without removing it from the chuck.
I mostly do this because it is rare that I have to make a between centers part and when I do, it is far more convenient to just return the same scrap to a point than to get the crane, lifting hook, protections, unclamp the 3-jaw/4-jaw and redo everything in reverse later, as the chuck weighs around 200 kg.
What happens if you mark the work piece so that it is “keyed” to a given jaw on the three-jaw? When you take it out and put it back and align the mark with the same given jaw it should at least compensate for the non-circularity of the work piece.
You’ll never get it back in exactly the same place for thousandths-level precision.
Possibly stupid question:
How does one ensure that both centers are on the same plane? Does it matter?
You should check out my video on lathe alignment!
@@Blondihacks Will do, thx!
It does matter to prevent you from accidentally turning a taper if the line between the centres is not parallel to the ways.
The other thing that matters is that the spindle dead center must be running completely true with absolutely no runout. Nearly impossible with a small lathe. I accomplish this by mounting the dead center in a 4-jaw chuck and dialing in the center point.
Quinn I read all the questions did not see this question in there. If I am buying a Bolton lathe that has a 3 jaw Chuck on it. they don't have a 4 jaw Chuck for it and it doesn't have a backing plate or something what he said I'd have to make it backing plate to accept any four jaw chuck? Would it be that difficult to make a backing plate? Or to have one made? Would it be that expensive? Lot of variables here I understand just looking for a shot in the dark what you think? Definitely value your opinion. Thank you.
Yes, a common project for a lathe is to make a chuck backing plate. The four jaw is a relatively easy case because the plate doesn’t have to be perfect. Any runout will be dialed out when you dial in the part anyway. A three jaw or collet chuck backing plate needs to be either adjustable, or made perfect to begin with.
@@Blondihacks thank you so much.
And ends with the cat… algorithmic magic
One question. I understand that turning between centers would keep the part rotating around its true center and be repeatable, but what ensures that the center is centered relative to the tool? ...or, is that just inherent to the design of the machine? (in other words, how can you be absolutely sure the tailstock point and the spindle center are perfectly aligned? (can they ever be out of alignment relative to the tool and the rails the tool moves on? Couldn't the points at the spindle and/or the tail stock be slightly out of center? (maybe this is a DUH question... but I am a noob)
You are relying on the straightness and squareness of the ways, and the concentricity of your centers. Turning between centers is highly repeatable (since the spindle and tailstock are only moving on 1 precision surface, the ways) so you can maintain the concentricity. It is possible to turn tapers using centers, by intentionally raising or lowering the tail support.
Nevermind. This video just explained.
just got a grizzly g602
Hi, did you make the dog or can it be purchased somewhere? Tnx!
Wait, wait, I thought Keith Fenner was the reigning Four Jaw Champion?
Architype0 He is indeed!
I don’t know. Abom has a magic chuck key. He goes around a couple of times with that thing and dials in 10” stock to half a thousandth.
He claimed that he retired from competition.
Can you put the 2nd center into a 3 jaw chuck and do two center turning?
Use a 4-jaw chuck and dial in the center point.
3 Jaw or 4 jaw chucks be danged, I would rather chomp on a Wood chuck says kitty @ 8:59
An observation that I've made: Some of the most intelligent CZcams content creators seem to be from Canada.
Canadian Legends:
1.) Jason Quitt - Genius Canadian, mineral seller, spiritual teacher.
2.) George St. Pierre
3.) Ryan "Fort Nine" funniest and best motorcycle channel ever invented by man, Ryan writes all his own scripts. YOU MUST see his videos. They are engineering and educational masterpieces.
4.) Eric Dollard - Master inventor, historical electricity researcher, and seller of electronic medical devices. SOTA instruments.
5.) Throttle House - Hilarious car show on CZcams. Another must see. Hosts are like sitcom actors. One is Canadian.
The intelligence of Canadian people, especially their fluidity of speaking and precision of language, appears to be significantly higher than the American people I've seen across CZcams.
One thing that is really frustrating about American men, is their wholly incomplete knowledge of Physical Science and Chemistry. A channel like this is an outlier, where there is actually NEW scientific information presented. Thank you Blondihacks.