Re: Roll/thread form taps

Posted by greywynd on March 17, 2005 at 23:54:26 from (216.209.119.152):

In Reply to: Re: Taps/Easy outs posted by Aces on March 17, 2005 at 18:51:05:

I never thought to mention these, they aren't usually the sort of thing that a 'tractor' guy would come across or need. Some people call them thread form taps, like you said, or I know a lot of guys that call them 'roll' taps, because of the way they 'roll' the material into the thread form. We use a lot of them at work for 'tapping' the zinc diecastings that we produce, and we have to be really careful selecting the tap that we use, as a lot of our taps are oversized, because we have to allow for plating after tapping. Due to different plating thicknesses, we have different types and sizes of taps to allow for that.

You're also right, thay are not for use in steel or cast iron, I believe they only work in non-ferrous metals, such as aluminum and zinc. I don't know if they work in brass or opper, I can't recall seeing them used, but maybe with the right applications they can be.

Mark

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