Cutting/boring bush

What sort/shape should a cutter be boring out a copper coated bush in a milling machine. Was going to use a piece of 6mm hss.

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When you say coated. How thick is the coating and what is the base material under the coating.?

I ask this as if it's not a very thick coating you may be able to get under it in the first pass.

Are you also sure the bush is copper.?

Nick

And, following on from Nick's post, are you sure it isn't an oilite bush?

It's a copper coated small end bush. I assume it'll be steel. Only got to remove about 0.4mm

What size is the bore as that will determine what sort of tools will fit down the hole.

Do you have a boring head?

50mm bore by about 50mm deep. Yeah a vertex adjustable boring head which has 18mm holes

Piece of 18mm bar drilled across at the end to take your 6mm HSS toolbit and then cross drilled for a grub screw say M5 to retain the bit. Should be nice and rigid which will help keep the bore parallel.

Thanks yeah that what I was thinking but what shape should I grind the cutter to get the best result. I.e. Large radius , relief and speed etc

Edited By Rocketman on 18/08/2017 18:59:45

Is it a Glacier bush, or whatever they call themselves these days. They make steel backed bushes with various bearing materials. If it is then it can be pushed out and a replacement fitted, no matching necessary.

Click the "988 photos" under my avitar and look in the "sketches" album, there are 4 photos there of a between ctrs boring bar numbered bb1-4 they show a suitable cutter profile.