djtom
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| posted on 12/9/11 at 05:03 PM |
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What are these?!
I bought a job lot of tooling from an engineering workshop that was closing down and I'm selling it bit by bit on eBay.
I've just come across some items that I don't recognise. They're about 2" long, 1 1/2" wide and look like big thread
taps, but the grooves are parallel, not spiral.
Any ideas (and are they worth anything!)?
Tom
 
mystery tools
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Peteff
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| posted on 12/9/11 at 05:17 PM |
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The one without grooves looks like a reamer.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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The Shootist
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 posted on 12/9/11 at 06:26 PM |
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Hobbs
No wait! No spiral?
Roughing mills. definitely.
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MikeRJ
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| posted on 12/9/11 at 07:41 PM |
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quote:
Originally posted by The Shootist
No wait! No spiral?
Roughing mills. definitely.
I though the flutes would be spiral on a roughing mill? Also the "teeth" would have to be staggered otherwise you really would produce a
rough finish!
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The Shootist
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| posted on 13/9/11 at 05:28 PM |
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I though the flutes would be spiral on a roughing mill? Also the "teeth" would have to be staggered otherwise you really would produce a
rough finish!
Depends on intended usage. Some milling is done with the cutter at an angle across the workpiece. With a roughing mill material removal is top
priority, surface will be cleaned up by a later pass with a finishing cutter.
They seem to be for milling as i think I see an internal taper.
Ahaa! They are "Thread Mills" http://www.carbidedepot.com/formulas-threadmilling.htm
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djtom
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| posted on 18/9/11 at 06:09 PM |
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Yes, I am coming to the conclusion that theyy are thread mills. That would explain why the collection of them that I have acquired have different
pitches between the teeth....!
Thanks for all input. Anyone want to buy them?
Tom
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