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Post by FrankenMech on Jul 30, 2020 17:48:20 GMT -5
What brand of taps were you buying?
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Post by 90GTVert on Jul 30, 2020 17:52:36 GMT -5
The first was Snap-On. The set of 3 was Irwin, which I read was supposed to be made by the same folks that make Snap-On.
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Post by FrankenMech on Jul 30, 2020 18:08:34 GMT -5
Wow, that is terrible. Most of my taps are Hanson, Starret (STC), or Greenlee (GTD) . I have never seen one that wasn't concentric. I have some that are unidentified though.
I suppose that taps made for machine tapping have to be better than taps ostensibly used for hand tapping or in a hand drill.
You might have better luck with buying taps from a regular tool company that specializes in industrial tools for lathes or Mills.
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Post by 190mech on Jul 30, 2020 19:26:18 GMT -5
Only way to make a concentric inner thread with an outer diameter is cutting it with a single point tool which is an operation with absolute focus on the task at hand..  |
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Post by FrankenMech on Jul 30, 2020 22:44:46 GMT -5
Small diameters are a tap only type operation. A lot depends on how concentric the hole for the tap is. I have done inner dia single point threading of 3/4" threads but nothing smaller. I don't think I could see well enough or be coordinated enough to do that anymore. Single point threading up to a shoulder or the bottom of a hole or counter bore is a hair raising task. When I worked on the pipe die line most of the threading was done at 100RPM and 12 threads per inch. That was a high 'pucker factor' operation.
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Post by 90GTVert on Feb 1, 2021 7:35:54 GMT -5
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Post by oldgeek on Feb 1, 2021 9:29:41 GMT -5
Those are very nice, especially the carriage stop. Thanks! |
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