turmning test

turmning test

This topic has 4 replies, 3 voices, and was last updated 23 May 2011 at 08:06 by Sam Stones.

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22 May 2011 at 16:07 #69024
Nobby
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@nobby
Hi

Was this a test for screwcutting that went wrong

Nobby
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22 May 2011 at 16:07 #21864
Nobby
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@nobby
23 May 2011 at 02:00 #69063
Ian S C
Participant
@iansc
Been there done that! I still do’nt know what went wrong, sorry can’t help. Ian S C
23 May 2011 at 06:51 #69065
Ian S C
Participant
@iansc
Sorry Nobby, did’nt read your question correctly,yes i’v had a thread come out like that. From what was said by the origional thread I think it needed abit more depth of cut, and a bit faster feed rate, he said he was using his finest rate of feed, so the tool was proberbly just rubbing, then digging in then starting all over again. Ian S C
23 May 2011 at 08:06 #69066
Sam Stones
Participant
@samstones42903
In my opinion, that sort of finish is typical of very low grade mild steel (MS), where the swarf is tearing and periodically reattaching itself to the workpiece.

Someone gave me some old lift (elevator) 3″ diameter winding axles, removed from a city office block in Melbourne. I was delighted until I came to use it. It turned out to be rubbish, and wouldn’t turn or mill without wearing out cutters.

With reference to this thread, a test with the same cutters on some free-cutting MS might prove me wrong. And of course, having the cutter height set correctly if that wasn’t already checked.

A decent cutting fluid might also yield more information.

Regards,

Sam
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