Carbide tool mirror finish interrupted cut

[Raymond AndersonParticipant @raymondanderson34407]

304 it's a w***e, 303's the one for me. 303 is free cutting Stainless and is not problematic to turning, milling or any other op.

[Neil WyattModerator @neilwyatt]

Curiously enough i just made an M5 thumbscrew in random stainless from an old inkjet.

Lovely steel to work, so probably 303.

Occurs to me that such things are a great practice piece, turning, facing, 45 degree bevelling knurling and threading all on a tiny bit of metal.

Neil

[MWParticipant @mw27036]

I agree with some others that without experience of turning stainless 303, I treated it like any other piece of steel and used the wrong speed, which didn't work out too well with HSS tools =s (was fine once I adjusted it).

I think I've heard 316 being a very nice one to use. That might be only in plate/sheet form though.

I've certainly heard that .304 is the devilish one for sure . Might actually only be appropriate for welding or just wanting a plate that's dead hard. 

Michael W

Edited By Michael-w on 09/06/2018 15:15:40

[Raymond AndersonParticipant @raymondanderson34407]

Hi Michael w, 316 is available in round bar in addition to plate. 316 comes in a few different compositions ie 316 Ti 316 H ect.

[Ian S CParticipant @iansc]

Found an interesting way of taking the edge off a carbide tip on my latest wee job. A new Butcher has taken over the local butcher's shop, and he found that the cutter discs on the mincer were badly worn, he sent them to me at the Menzshed. I decided that the Box-Ford A was not the machine for the job, so I took them home to my 1326 BH Taiwanese machine with 8" chucks and 1.5 hp motor. The mincer discs are made of Inox steel, and fairly tough. The high parts on the discs were at the rim and near the centre, but the killer bit is the piece in between with dozens of 4 mm holes. I took it down until it just started to rub on the in between area, then left it, when I got to the butchers I suggested that to do better it would need to be ground and the 4 fingered knife would need regrinding to fit, But they were over the moon to get what I had managed. The steel might have been tough, but the tool left no marks, it came up like a mirror at 420 rpm.

One of the discs required to be bored, and I was getting on fine, taking off .5 mm DOC, as the hole opened out I thought(twitt) that some cuttng fluid might help, squert, snap, the tip of the insert fell off. Don't suddenly cool a carbide tip. The broken tip actually cut better than before the break, and finished the job.

Ian S C

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