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5th Apr 2009, 10:04 PM #1
Need to borrow some taps and dies
Does anyone have some 3/8" UNF Left & Right hand taps and dies I can borrow?
If not UNF then any other fine thread. If not 3/8" then similar size.
It's for an entry in the AWRs toolmaking competition
Cheers,
Andrew
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5th Apr 2009, 11:44 PM #2Most Valued Member
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- Jun 2007
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- sydney ( st marys )
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Why dont you just give yourself the practice and cut them on your new lathe.
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6th Apr 2009, 10:34 PM #3
I can't cut left hand threads on my lathe
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6th Apr 2009, 11:14 PM #4Member
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- Kyabram, Victoria, Australia
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6th Apr 2009, 11:17 PM #5
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8th Apr 2009, 10:04 AM #6Senior Member
- Join Date
- Nov 2008
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- Canberra
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I bet you can cut left hand threads on your lathe. Put one extra idler gear (it doesn't matter how many teeth it has, it won't change the pitch) on the gear train and left hand she will cut. This is how it was done on many old fashioned lathes made for the amature. You can make an internal screwcutting tool out of silver steel and possibly not need a tap or a die
A small tip about taps if you end up buying any. The toolshop usually sells them made of HSS with the threads ground. These are expensive. It is also possible to get good carbon steel taps which are much much cheaper and don't have ground threads. Carbon steel taps are at least as hard as HSS, but can't stand as much heat. Why you need hand taps to take heat I'm not sure. If your tool shop doesn't have carbon steel taps they can probably order them in for you. Personally I never buy HSS taps.
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