Re: [CAD_CAM_EDM_DRO] Re: Thread milling

> Thread mill crests are ground perpendicular to the shank, taps have

a

> spiral. Taps rotate in the center of the hole and advance into the

hole

> at the thread pitch, thus the spiral is correct.
> Thread mills rotate about the tool axis, offset from the hole axis,

thus

> the high side of the crest will rub. It might not be terribly

critical

> for hobby work, I've read posts from people that use taps and don't
> relieve them. But it won't pass for aerospace quality work...
>
> Jon

Hi,

I've been following this thread with some interest. Kinda imagining it
in my mind's eye... And when I "glanced up" I realized I have no idea
how you'd hold a tap in the spindle. Seems like thread mills had
standard sized shanks, no? Maybe if the tap was just the righ size
a collet would do the trick. If not I'm stumped. Or did I miss
something?

Thanks,

Jeff