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Collet quality

Maplehead

Active Member
Active Member
Joined
Feb 20, 2017
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#1
Hi All
I’ve been noticing that my 2MT collets have been starting to have an issue when I am tightening them in place with the draw bar. I hold them by hand firmly, with end mill in them and then as I tighten down and then go to use my spindle tool to final tighten the collet in place, they drop down a bit. However, my chuck with its 2MT collect never has an issue. This is becoming a PITA. I usually have to grab my pliers to hold the collet while I do the final tightening.
Is this a quality thing?
I got my collets from the Little Machine Shop. I run a micro mill that I bought from there. (And yes, it cuts steel.)
 

rgray

Active User
H-M Supporter-Premium Member
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Nov 26, 2012
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#2
Solid morse tapers are self wedging. I have never used a split morse taper but one with the appropriate sized tool in it should fit the same as a solid.
Clean and dry and with the end mill or whatever in it...insert it into the machine with some speed and it should wedge right in and hold itself in place.
Is the drawbar preventing you from doing this? If so can it be lifted out of the way till the collet is in?
 

4gsr

HM Chief Foreman
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Aug 8, 2011
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#3
Clean the threads on the drawbar with a die nut and clean out the threads on the collets with a tap. Also clean the bore of the spindle real good and the OD's of the collets and see if that fixes the problem.
 

Tony Pisano

Swarf
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Nov 2, 2017
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#4
Is the spindle keyed? I haven't dealt with that size collet, but the machines I've used with split collets have all had a small key to keep the collet from spinning as you tighten. Smoetimes the keys get worn if collets aren't properly seated and need to be replaced.
 

Maplehead

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Feb 20, 2017
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#5
Hi All
Thanks for the replies.
This is the set of collets that I got.
https://littlemachineshop.com/products/product_view.php?ProductID=3491&category=
I’ve tried the above suggestions the best I could. The main collet giving me trouble is the 3/8’th one. That one gets the most use. The issue still stands. Maybe it’s just worn out in the wrong spot. I tried re-tapping it but I couldn’t get the tap to go into it. I’ll probably just order and set, or at least, another 3/8’th.
 

casca92

MURPHY:Was an optimist ,when compared to me
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Jan 22, 2017
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#6
I sure don't have the vast knowledge that stored away on this board. but, may I suggest is that you replace the 3/8 collet with a mucher higher quality collet. I have been purchasing tooling here and there. As I have a better understanding of my needs and the crap tools float to the top. The better quality becomes more of an investment than an experiment
 
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