Rik, I would say that as long as it is easily drillable, you should have no problem. Ian S C

Surely the easy answer to this is to strip the chuck down, plot where the holes you intend to drill are going and then establish if they are going to interfere in any way with the workings of the chuck. If in doubt don't proceed.

I can quite understand the response from WARCO and think it is quite reasonable as this is not something that I would expect them to have any knowledge of and is well outside of their remit. There is no reason why he/she should have any knowledge of what could go wrong if you decide to make a non standard modification to your chuck

Martin

Safest to strip and check. Make sure there is room and depth for the counterbore to take the head of the socket screw. Hard to visualise a chuck that doesn't have room but we all know about ASSumptions. Its always the silly, "too obvious to check" stuff which gets me!

Many front mount four jaws have the fixings at about 1/3 rd to 1/2 radius from the centre rather than out on the rim. Leaving aside the big industrial A series mounting stuff is this just a different way of going about things or are there specific advantages and disadvantages relative to rimwards fixing which may be worth considering depending on the planned application.

Clive

There’s not much to strip in a four jaw independent once the jaws and actuating screws are out. A photo would help but I can’t imagine there’d be much problem in doing what you want to do. Burnerd 4″ four jaws are front mounting. The body is likely to be cast iron or sometimes steel, both easy to drill. Any chuck that’s more “exotic” won’t be on a budget Warco.

Have just had another look at my 4 jaw. The backplate is held on by 4 screws and carries the 3 M8 fixing screws. I t looks as if the backplate could be rotated to allow for thu' drilling.

Since you will be stripping down the chuck ..you will won’t you?… any of the moving bits will immediately become clear whether they would be intersected by the drill holes..

Good luck

Rik, the only thing you need to look out for is the thickness of the casting between the jaws, as the back of the chuck is hollow, although the threaded holes from the back could be taken right through. There may not be enough metal in some parts to take the counter bore. Ian S C