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View Full Version : Identifying Collet and a Stuck Collet



Fasttrack
05-20-2009, 12:36 AM
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!

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010008.jpg

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010050.jpg

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010033.jpg

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010034.jpg
The largest part on the collet is .875" in diameter...

doctor demo
05-20-2009, 01:44 AM
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

hardtail
05-20-2009, 02:01 AM
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.......

ARFF79
05-20-2009, 03:53 AM
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"

MickeyD
05-20-2009, 09:39 AM
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 .

JCHannum
05-20-2009, 10:24 AM
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/kwikswitch/index.html

Fasttrack
05-20-2009, 10:36 AM
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.

lane
05-20-2009, 06:58 PM
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.

JCHannum
05-20-2009, 08:18 PM
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.

JCHannum
05-20-2009, 11:44 PM
Here you go; K&T 20 collet per johnoder.

http://www.practicalmachinist.com/vb/showthread.php/kearney-trecker-2d-angle-181792.html

Fasttrack
05-21-2009, 01:56 AM
Thanks guys. I got a chance to play with it a little today. It just dried out enough to start planting so I'm working 12-16 hour shifts with my brother-in-law. I was being mentally deficient earlier - I assume that big nut you all referred to was the one with the "holes" for a spanner wrench, not the larger one with the "slots". That one came off and the whole collet chuck popped out nice and easy. Now I can get a brass rod down in there and knock out the collet.

Now I'd like to know if that quick change nose comes off, and, if it does, how... The book says it has a 30 taper spindle and I'd really like to get a ER collet chuck for it. I figure I can get a whole set of those a lot easier than a KT proprietary set of collets. I've got a few, but nothing near a "complete" set.

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010082.jpg

http://i108.photobucket.com/albums/n22/fasttrack237/Kearney%20Trecker%202D/P1010083.jpg

edit: I did try tapping it on the side, but no luck. I didn't want to get too carried away and damage the spindle/spindle bearings going after it with a 3 lb sledge or something :D

JCHannum
05-21-2009, 07:30 AM
From johnoder's reply in the thread I linked to, he mentions a K&T 30 taper spindle in the K&T 2D.

That holder looks like it is a 30 taper. Since the 2D head moves as it does, a drawbar cannot be used. This would require the holder to be retained form the bottom with a "draw nut". This might be what you are seeing and a common 30 taper collet chuck might not fit.

At this point, I don't think there is anything more to tap on the machine.