ER Collet Question

Most companies claim .039" collapse range on typical ER collets...


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I find it hard to believe that a 1MM collet (04208-01.0) can close down to just about zero and still hold something. Anyone know if the smaller collet sizes have a different close-down tolerance that they are simply rounding?

Regards, Joe Agro, Jr. (800) 871-5022

01.908.542.0244 Automatic / Pneumatic Drills:
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Spindle Drills:
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Reply to
Joe AutoDrill
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When I buy the smaller ER 11 collets, they can get down to about .015" without appreciable runout.

I, uh, haven't tried holding a 0" drill, tho ;-)

Reply to
Tom Accuosti

"Joe AutoDrill" wrote in news:H%LCg.5214$Pp1.3967@trndny04:

They can. Years ago 1mm was the smallest collet you could get. Today you can get .5mm collets. The .5 will give you good TIR more consistantly than a 1mm collet will. Also when using very small shank drills, they are less apt to get caught in the slots on the smaller collet.

Anymore, I try to use 1mm shank drills for any drill under 1/32". Those drills tend to be straighter and are certainly easier to change. Unfortunately most have a fairly limited drill depth.

Reply to
D Murphy

Normaly, the smaller ones can only close-down 0.5mm. Above 3mm or so (depending on the collet size), they do 1mm.


Reply to
Nick Müller

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