Convert 4-jaw to front-mount?

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DaveH:
Hi Dave,

I drilled thru and counter bored (the front face) to take 4 cap head screws of my 4 jaw chuck to fit on my RT.
To help to align it (centre it) on the RT, I also counter bored the back part of the 4 jaw chuck to act as a register.
:beer:
DaveH

Jonny:
Dave if you take the chuck apart and see where the workings are, you could then drill through at 90 or 120 degrees to line u with T slots.
Easy done it 13 yr ago and still in use daily. My trouble was small 3 jaw 5 1/4" scroll chuck on to an 8" RT with 4 slots. Less is more substantial, i drilled through and tapped the RT. Heres a piccy took whilst doing one of the dros, patterned out 3/4" thick aluminum one pass- good enough not moved yet?
][/img]

hopefuldave:
It sounds like drilling the chuck body's feasible, then...

Right, time to steel my nerves and drill it! To get the holes to line up with each other quickly, I think I might put "keep plates" on the end of the tee nuts so it stops 'em disappearing towards the centre, then (knowing the diameter of the holes' PCD in the chuck) mark and drill - this would at least leave the chuck roughly centred, and with a 4-jaw I'll be centring the work anyway :)

Thanks for the suggestions, chaps!

Dave H. (the other one)

Jonny:
Try clamping the actual chuck and centre up and zero all dials.
Then just offset either way 90 degrees X amount and drill that hole. Back on centre move X axis either way same x amount and drill, no need for marking, cr drilling etc.
Just make sure theres no mechanical bits where going to drill through as in 3 jaw scrollers.
I wouldnt go any larger than the screw size you are using.

Could stamp a mark to line chuck and RT up when refitting.

75Plus:
If the chuck is about the same diameter as the RT it would seem that you could just drill the existing holes through to the front. Then counter bore the holes to recess the heads of socket head cap screws. Depending on the size of the existing holes you may be able to use a smaller diameter cap screw or, if necessary, the same size screw can be reduced just above the threads that enter the tee nuts. The latter would keep the screws captive.

Joe

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