Making a large hole a bit larger

I've got a stainless steel ring, approx 100mm in diameter, with an approx 50mm hole in the centre. The item is about 2mm thick. I'd like the hole in the middle to be a bit wider, say 60mm - what's the best method to use in doing this? Doesn't have to be mega accurate or concentric (it's an escutcheon that goes around a steering column on a kit car that was a little too small) so the odd mm here and there won't matter, as long as it looks round by visual inspection

Reply to
Robin
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Robin,

If you don't want it super accurate, grab the ring in the outside jaws of a three jaw SC and bore the hole to the size required. If you want accuracy, grab in the outside jaws of a four jaw and adjust to be concentric, then bore to size.

A 100mm disc should go in the outside jaws of a 4" chuck without too many problems. I think I could manage it on my ML10 without the jaws fouling the bed. :-)

Jim.

Reply to
Jim Guthrie

The other option would be to clamp it to the face plate of the lathe i

the chuck jaws won't hold it. You can clamp it finger tight and spi the face plate gently tapping the ring until it runs true and the clamp it tightly. Ideally space it away from the face plate so th cutting tool doesn't mar the front face

-- DX-SF

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Reply to
DX-SFX

The message from "Robin" contains these words:

I would just fix a bit of say, plywood to a face plate. Skim the surface and maybe leave a 50mm plug to centre the plate then fix with double sided tape or some screws around the rim and bore out to size. Bill Lamond

Reply to
William J Lamond

The ring has already got screw holes in it, so fixing it shouldn't be a problem. I haven't got a face plate at the moment, but it should fit in my 4-jaw chuck... a spacer might be a good idea... I'll have a play around

thanks!

Reply to
Robin

You could easily hold a bit of wood in the chuck, face it clean and screw the disc to that.

-- Dave Baker

Reply to
Dave Baker

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