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3 Jaw self centering ER chuck

An unusual tool

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Joseph Noci 120/02/2019 09:54:34
443 forum posts
805 photos

Would there not be a chance of swarf, minute or otherwise, penetrating the collet/jaw contact area when the jaws are released to remove the work piece? After all, the swarf flies everywhere inside the cabinet and in the video, the tiny brass shavings might enter the chuck area. Unlike a normal collet holder that is essentially sealed except for the slots at the workface.

I still like the idea though. I also especially like the cnc machine..

Joe

JasonB20/02/2019 10:01:20
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14864 forum posts
1492 photos

He says he uses through coolant collets so slots are sealed

jimmy b20/02/2019 10:45:30
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434 forum posts
27 photos

I just used to hold an ER collet chuck in some soft jaws.

I really can't see an advantage to how this is shown.

JIm

Chris Trice20/02/2019 10:45:51
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1332 forum posts
9 photos

Given the high degree of accuracy with which the chuck jaws are obviously machined, I can imagine that the part of the jaws that fits in the collet groove also contact the bottom of the collet groove and participate in the closing action as well as preventing the collet being squeezed out the chuck..

Chris Trice20/02/2019 10:51:21
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1332 forum posts
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Posted by jimmy b on 20/02/2019 10:45:30:

I just used to hold an ER collet chuck in some soft jaws.

I really can't see an advantage to how this is shown.

JIm

I don't think it's an attempt to improve accuracy but more about being able to change sizes quickly and positional consistency. However, I suspect it's probably very accurate also since the soft jaws by their nature hold very accurate tolerance when holding at the position they were machined at.

JasonB20/02/2019 11:19:28
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Once again if you read the link you will see in this instance he has 250 of those brass tubes to machine and the setup allows the material autofeed to be used rather than having to stand by the machine to undo and tighten an ER Collet 250 times

Edited By JasonB on 20/02/2019 11:20:11

Neil Lickfold21/02/2019 06:02:20
506 forum posts
89 photos

It is a easy way to have an auto collet closer using the 3 jaw chuck.

Neil

Joseph Noci 121/02/2019 06:26:27
443 forum posts
805 photos
Posted by JasonB on 20/02/2019 10:01:20:

He says he uses through coolant collets so slots are sealed

I am not sure I understand what you mean by 'sealed'

Your photo below shows normal slit collets - where is the sealed slots? My query was re swarf entering the three jaw to collet contact area,ie the collet taper surface. The 3 jaws have space between them where swarf could enter and when the 3jaw retracts to decompress the collet, swarf can enter the gap, enter the collet slit, or the collet to soft-jaw contact area, upsetting TIR surely..?

Joe

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