Drilling a hole through Keyless chuck

This topic has 4 replies, 3 voices, and was last updated 7 August 2012 at 19:22 by Lambton.

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6 August 2012 at 21:39 #95862
Ian P
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@ianp
I have a unused 1/4"-6mm 'Supra' Rohm drill chuck which I want to 'improve' by drilling a 1/4" hole all the way through. At present the jaw opening and the fixing ends are both blind.

The jaw section of the chuck has a very shallow depth and only grips the top 15-18mm of the drill. Its fine for most drills but I want to hold a (usually double ended) Slocumb bit so only the tips of jaws really come into play.

The part I want to drill is very hard but I am hoping it will succumb to a carbide drill so I need to dismantle it first. Does anyone know how easy it easy to dismantle a Rohm chuck?

Ian

Edited By Ian Phillips on 06/08/2012 21:41:35
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6 August 2012 at 21:39 #22172
Ian P
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@ianp
6 August 2012 at 22:04 #95865
JasonB
Moderator
@jasonb
I would have thought its easier to cut one end off the centre drill than modify the chuck or if it's just for starting a hole use a spotting drill.

J
6 August 2012 at 22:37 #95866
Ian P
Participant
@ianp
You may be right Jason! After my posting I Googled to see if I could find a 'Teardown' video on youtube, I didn't, but I did see a cross section view and it looks as if this type of chuck has a central 'Leadscrew' so my drilling would have nicely wrecked it.

Ian
7 August 2012 at 19:22 #95900
Lambton
Participant
@lambton
What you are trying to drill through is the hardened thrust plate which works against the inner ends of the jaws and is operated by the rotation of a screwed sleeve. I do not think you will have much luck and if you do manage to drill through the thrust plate you will probably ruin a good chuck.
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Drilling a hole through Keyless chuck

Drilling a hole through Keyless chuck

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