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Chuck fitting

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Vic18/07/2021 11:15:51
3060 forum posts
8 photos

After some thought I think I’d prefer to re-drill three new holes in the flange if I can. I will test it with a new bit soon. One concern for me was bolt spacing with the flange in situ. I do however have a collet Chuck with threaded through holes so I could clamp this in place and use it as a guide with some threaded guides in the holes. I did also think to space the new holes equidistant with the old but I’m not sure there’s any advantage in this. If I can drill the flange I plan on using hi tensile socket set screws and flanged nuts. My thinking with all of this is that provided the threads are kept clean I should be able to spin the nuts on and off most of the way with tools, just resorting to a spanner for final tightening.

old mart18/07/2021 15:08:55
3724 forum posts
233 photos

Space the new holes evenly between the old ones and you will always have the choice of two fixing methods.

Vic18/07/2021 15:41:51
3060 forum posts
8 photos

Spacing the new holes like that was my first thought but it doesn’t matter, I’ll still have the choice no matter where the holes are.

Howard Lewis19/07/2021 20:32:32
6032 forum posts
14 photos

If you plan to mount a 4 jaw chuck at any time in the future, it may be worth having one of the new holes common to both 3 and 4 jaw fixings.

And it means one hole less to drill!i, so that the flange does not start to look like Edam cheese!

By that stage it will have 9 holes in it!, 3 counterbored and 6 new ones for the chucks.

Personally, I would turn up collars for the existing holes and drill the three extra holes for the 4 jaw chuck, fit studs to the chucks, and use nuts.


Vic20/07/2021 21:27:26
3060 forum posts
8 photos

All my chucks, 4” 3JSC, 4” FJI, 5” FJI and ER32 collet all have the same bolt hole centres.

Some of the studs arrived today so I tried it out using the existing holes and some flange nuts and it seemed quite secure. Once I can see what clearance I have I may make some top hat washers for the existing holes and see how that goes.

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