[TheForge] 2 tapping questions, oops 3

[theforge@mailman.qth.net]

>3.  One of the taps has no flutes or spaces in the cutting teeth, but the
>cutters are continuous 360 degrees.  What is it?  I have some retreading
>taps and they don't look like that.
>

>
>Jeff Valentine
>
______________

called a forming tap. sometimes called a roll thread tap. the thread is similar to a rolled thread but not technically "rolled". tap drill size for a forming tap is the pitch diameter of the desired thread. thread size is controlled by making the hole bigger or smaller. forming taps take more power but make a very nice thread in any material.

bob s.