Reaming stainless

[Martin DowingParticipant @martindowing58466]

what type of reamers are best for stainless 304 if you don't want them blunt in no time at all?

[Martin DowingParticipant @martindowing58466]

[David George 1Participant @davidgeorge1]

You can buy carbide reams either solid or carbide tipped. They are not cheap but it depends how many holes in stainless you are reaming.

David

[Tim StevensParticipant @timstevens64731]

One problem with stainless is the work-hardening caused by rubbing – caused by a blunt tool – and which then blunts the tool further. But I expect you have found that already.

Cheers, Tim

[old martParticipant @oldmart]

A sharp tool, slow speed, but high feed rate is safest with SS. Lubricate with cutting/tapping oil.

Edited By old mart on 28/02/2021 15:52:09

[Martin DowingParticipant @martindowing58466]

Many thanks for these comments, as always they are helpful.

@David – will investigate these. 20 holes 7mm @ 2 inch deep for vacuum equpiment.

@Tim – yes, I have found it already. I do all what I can to ensure that reamer works as cutting rather than rubbing or cold forming device – but you know mistakes/errors do happen and drill 6.7 mm can on odd occassion cut a bit larger hole, particularly if hand sharpened.

@old mart – now I have lever operaed tailstock – it is God sent device for reaming. Handwheel ended up in box and wasn't seen from then onwards.

[Chris Evans 6Participant @chrisevans6]

I avoid 304 stainless. 306 is bad enough for me. But for hobby use I get to choose which you cant do if an industry specification.

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