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How does this collet work?

8.5mm to MT1 with tang

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Ian P22/05/2019 20:31:29
2406 forum posts
101 photos


I dont have anything in my workshop that takes Morse 1 but I keep moving this item from drawer to drawer and every time wonder what it would be used for.

An 8.50mm drill shank is a perfect fit but how would it be tightened up?

Ian P

Ian McVickers22/05/2019 20:45:28
185 forum posts
89 photos

It's for holding straight shank drill in a taper socket. Does it not lock onto the drill when gently tapped into the MT socket?

HOWARDT22/05/2019 21:26:59
567 forum posts
15 photos

It is a Morse taper split sleeve drill driver. The drill to suit the driver is parallel shank with a small pair of flats on the end. Used in production setups for small drills, cheaper to use with replaceable straight shank drill rather than morse taper. Used to use these quite a lot on multi spindle drill heads with smaller, sub 10mm drills.

Ian P22/05/2019 21:35:40
2406 forum posts
101 photos

Ah, I understand now. I did not realise that the drill would have driving flats and could not see how the collet could be tightened other than by hitting the exposed edge which seems a bit crude.

If anyone seeing this thread has a use for it and pays postage or collects they can have it.

Ian P

John Reese24/05/2019 00:48:59
842 forum posts

A taper length drill in that drill driver is intended to have the same overall length as a taper shank drill.

DC31k29/05/2019 21:20:04
211 forum posts

What does the writing on it say?

I have a few of these and they are all for letter-size drills. If you squint at the picture, it looks like an 'R' on it, which would be closest to 8.5mm (but could equally be an '8'.

Ian P29/05/2019 21:40:12
2406 forum posts
101 photos

No writing on this one, but it slips on an 8.5mm drill shank perfectly.

Ian P

Michael Gilligan29/05/2019 22:00:51
15868 forum posts
693 photos


MIchaelG. nerd

HOWARDT29/05/2019 22:15:09
567 forum posts
15 photos

A link to Google books for those who need to read further.


Ian P29/05/2019 22:17:16
2406 forum posts
101 photos
Posted by Michael Gilligan on 29/05/2019 22:00:51:


MIchaelG. nerd

You've got better eyesight than me, or maybe used a microscope!

I will examine it tomorrow to see why I missed it.

Ian P

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