POSITIONING PARTS USING ISOSTATICS FOR SHORT PRODUCTION RUNS (JIGS & FIXTURES), MARC LECUYER
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- Опубликовано: 5 июл 2024
- This video answers Patrick's (from Belgium) question about how to position parts using isostatics. Isostatics is at the base of accurate and repetitive part positioning and is crucial to jig and fixture desing. As for all thatlazymachinist videos, this video is aimed at the novice machinist who wishes to develop proper basic work skills. MARC LECUYER, thatlazymachinist.com
Great stuff! I've never seen anyone cover the theory behind proper fixturing at all, much less with this kind of clarity. I'm sure many will be putting this info to work; I know I will.
Really good video Marc. Haven't seen anything like it or heard of isostatics before. Thanks again.
Your channel is my PRICISION channel. I am much older than you are, I grew up in my grandfather's steel fabrication shop, not machine shop but we had lathe, 50 T presses, heavy cutting machine etc. At 14 after school I was on the lathe, old flatbed ceiling transmission, and turning out the lookout aluminum assembly for the bomb shelter doors we we're fabricating. Was not pricise work. Therefore your terrific presentations are fresh air for me and thanks many times for all.
Very interesting "quickie". It is a delight to experience your sense of order as indicated by the efficient, clear, concise and complete explanations you offer. It is clear that you have a mastery of the subject material which inspires confidence in the learner, moi. Positioning now understood by the beginner at the beginner level (mine). I would have loved to have had you as my shop teacher! Much kudos is due your efforts.
Thank you. Yet again you have my admiration and appreciation.
Marc, I appreciate you sharing this info. At first I thought it was going to be boring, but when I saw you application on the mill, it all fell into place. It was interesting how the 123 blocks were angled, and producing the least amount of error. Thanks for the lesson.
Very nice 'quickie' and as always much appreciated you sharing knowledge.
Cheers
Bengt
Marc, Nice video. Thanks for sharing you time and talent
Keep the videos coming. I learn something new each time.
Thanks Marc, excellent lesson very much appreciated
Subscribed! Excellent information and delivery! Thank you!
Great video Marc. It's exactly what I've always intuitively done to position pieces accurately I'd just never stopped to think about why I was doing it.
Thank you, Mark! Method of drilling that you have shared, is very useful.
So much knowledge, it's amazing! :) Thanks for sharing!
In awe,
Arye Segal.
Thanks for another beneficial lesson.
Very informative. thanks for sharing your knowledge.
This was fascinating! I've never heard of this stuff before. Neat!
learning a lot Marc; keep up the good work.
Extreamly well informed am I (yoda). Exstreamly informative video not boring at all.
Great video!
Excellent Marc!
another great video
That's great. This is one of those things that I probably work out without knowing it. But having that little rule gives me a bit of help.
Just for that I'm subscribing. Thanks.
Love your videos
One thing that I know for sure that I learned from this video is the word tertiary I’ve been using thirdandairy Thank you And as always great video keep up the good work
A very thought provoking video. Thank you very much. I am already playing with a pair of 123 blocks on a fixture plate having fun thinking about it. I'd never thought about it before, but using 3 carbide balls in the fixture plate for the primary surface reference points would really eliminate some issues (and cause others).
Then we get to the issue that metals are flexible... and clamping makes everything move. Oh well, that's the fun of it, eh ?
Marc thank you so much for sharing all this knowledge . I started watching your videos a few months ago and I would like to ask you if you can do a quickie on a mill machine positioning an object that all the surfaces are round . I’m talking about making a fly cutter. Producing the slot and making the holes for the set screws. Thank you from Los Angeles Ca.
as Herb: seemingly boring at first - but really worth to stay through. A good example for theory applied to practical problems. Thanks a million for sharing.
Greetings Harald
This is superb stuff. It's fundamentals but I don't think it's commonly shared.
Very interesting. I'm sure I will use this info soon.
While waiting to visit Belgium, why not check out their world famous beers!!!! Try a glass of "Kwak" to be getting on with. Strong, smooth and tasty. Drink it cool, not freezing, say 13 deg. C. FYI, a similar Italian beer is Baladin brewery's "Elixir" and an English version would be Fullers brewery's "Golden Pride". All may be hard to track down.
Are there two "schools" of positioning? I have always thought of it as 6 degrees of freedom (which all have to be constrained). It works out the same, since each constraint fixes two directions, but it does seem to affect how I think about it. I like the 3-2-1 mnemonic (3 on primary, etc.) because it covers the two cases where positioning is meaningless in one or more directions. (A perfect disk has no rotational distinction, and a perfect sphere can rotate in any direction without being in a different position.)
Of course a clean plane against a clean plane substitutes for three points of constraint: Z linear, and X and Y rotations (assuming the plane is horizontal). You can tell that it substitutes for 3 points by counting the number of degrees of freedom it constrains.
Marc, why is it twice (as opposed to 3x or 4x) as accurate to forgo the sloppy fit of a central pin, for two pins on the external edge of the disk? 11:20
whatever variation you have on the overall length of your part will also affect the spread dimension of your holes when you flip the part end for end like that.
This is true and I should have mentioned it in the video! If the precision of the holes is high or if the outside of the part is not accurate but the spacing of the holes must be, one can drill all the first holes in all the parts and then move the spindle to the second location and do all the second ones keeping the part oriented the same way as they were for the first holes. Watch out for burrs when repositioning for the second holes! Thanks for the great insight The87wing and for the interest you take in my videos. Marc L'Ecuyer
איפה קונים קוביות כאלה ?
24/5000
Where do you buy such cubes?
I'll never fixture with the face of a 1-2-3 block again. BTW, what's a 1-2-3 block called in a metric country? 25.4-50.8-76.2 block? :-)
Hi the BerkeleyGang, in English I have always called them 1-2-3 blocs regardless of the unit used, in metric however they measure 25 x 50 x 75 and that's just to long to say. In French they are called "bloc de montage" and the translation would be "fixturing blocs". It's all quite confusing and I often have to measure a bloc before using it since I have both metric and imperial ones. Marc L'Ecuyer
Thanks Marc. Keep up the good work! Makes sense to me that they'd just be called a fixturing block. Even the tapped holes are "standard" thread vs. metric, so I've wondered how useful they'd really be to a machinist working with metric tools.
Marc, great video but what a surprise! I have a very good "pen pal" via the Internet named Rik Retsin who lives in Belgium. He and another Internet friend who lives in Alaska corresponds regularly with me. Both have machine shops and we learn much from each other. We have even formed our own online site just for ourselves called the Very Cool Tool Guys Club. It might be interesting to have you get in touch with him. I know I would always have a place to stay and a good friend in Belgium if I can ever get there. I don't want to speak for him but I can touch base with him to see if he would be interested.
Zed? What is zed? Is that canadian for z?
Yessir, it is. They pronounce many other words wrong, too.
:-)
Great information, but I will bet that if a millennial saw this video it would completely blow their mind and they would have no clue. LMAO
I'm not sure these programs are perfect, or it's just me who feels that way.
bonjours marc svp me contacter je tai laisser un message avec mes coordonné sur facebook.
merci
Denis