Re: [CAD_CAM_EDM_DRO] Re: Thread milling

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jeff Jones" wrote:

> 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?
>
A standard set of collets has sufficient range to hold any size shank
within their min to max size range. Depending on the type collet,
they will each collapse a certain amount. The collapse amount varies
by type of collet and that determines the increments necessary to
actually have a "full" set of collets.

////I was taught and its common knowledge within the ranks that there is no such thing as a size range on collets. Collets are ground to specific diameter. Using them on any other diameter will disfigure them and is referred to as "the cardinal sin of collets". Installing a larger or smaller than intended diameter in their bore will result in 3 points of contact within the spindle and risk triangulating the taper. To hold a tap shank which none of them are nominal, simply make an adapter in the lathe with a nominal O.D and setscrew to secure. There are some commercially available with collapsible collets like tapmatic uses if memory serves me correct.

Ron





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