Drilling a hole through Keyless chuck

[Ian PParticipant @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

[Ian PParticipant @ianp]

[JasonBModerator @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

[Ian PParticipant @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

[LambtonParticipant @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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