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Thread: Identifying Collet and a Stuck Collet

  1. #1
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    Default Identifying Collet and a Stuck Collet

    Well I just got my paws on a Kearney Trecker No 2D mill. The standard taper spindle is supposedly a NMTB 30 taper (or NT 30 or NST 30 etc)

    I'm not sure what kind of collets these are, however. What's more, I've got a collet stuck in the collet chuck and I don't know how to remove the collet chuck or collet! There is no drawbar going through the spindle and I'm not sure how it all goes together. Not at all like the other mills I've seen ... Any help is appreciated!








    The largest part on the collet is .875" in diameter...

  2. #2
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    Just tap on the side of the collet with a brass, lead ,dead blow, etc. bfh and the collet should fall out. In your pic it looks to Me that there is a nut that would use a spanner wrench simmilar to a ( loo taper spindle nut) wrench for a lathe. It wouldn't hurt to squirt a little WD40 in there first.

    Steve

  3. #3
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    Congrats on the K&T.......if the Pacemakers weren't enuff to pi$$ a person off you go and get the mini grandaddy of em all........LOL, paint em all green envy.........

    Good find FT, you have some fine iron accumulating in the quonset.......
    Opportunity knocks once, temptation leans on the doorbell.....

  4. #4
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    The collet is know by a letter designation and I believe it is a "Z" the smaller ones are double lettered and also come in a size "Y"

  5. #5
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    Shopswarf has a useful table for identifying collets - http://shopswarf.orconhosting.net.nz/collet.html , and their main index has some other very useful information on everything from horsepower required for compressors to reamer speeds and feeds - http://shopswarf.orconhosting.net.nz/sindex.html .

  6. #6
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    Quote Originally Posted by ARFF79
    The collet is know by a letter designation and I believe it is a "Z" the smaller ones are double lettered and also come in a size "Y"
    I don't think it is that type collet, the Z is a Universal collet, dimensions are here:

    http://www.tools-n-gizmos.com/specs/DT_Collet.html

    NMTB 30 taper is retained by a drawbar, but there are various takeoffs using the same taper. The spindle taper is probably 30 taper, the large nut should unscrew, allowing the holder to drop out. Take a look at the underside of the retaining nut. If it has notches, it might be like a Kwik Switch and take only a partial turn to release.

    http://www.mistequaygroup.com/univ/k...tch/index.html
    Jim H.

  7. #7
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    I thought I could just remove that large nut too - it turns out that is the spindle brake nut. It has three bronze shoes that lock the spindle to the quill... At least, that's what the parts manual calls it.

  8. #8
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    That is a universal engineering collet. Ether a z are zz series. Tap on the side of it and it will fall out. Typical of that stile of collet.

  9. #9
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    The taper on the backside looks long for a Universal collet. It might just be the photo, but there is a K&T head on the PM For Sale forum with a similar appearance. Maybe it is a K&T proprietary collet?

    In either case, it should drop out if tapped. Tapping can be variable, of course.
    Jim H.

  10. #10
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    Here you go; K&T 20 collet per johnoder.

    http://www.practicalmachinist.com/vb...le-181792.html
    Jim H.

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