Re: [CAD_CAM_EDM_DRO] Using a tapping attachment with a CNC bore cycle

On Thu, 14 Feb 2002 19:44:20 -0800, Jon Anderson
<janders@...> wrote:

>In CNC use with a tool changer, the torque arm is captivated. For most
>other uses, there's nothing wrong with just letting it ride against a
>stop.

I can do that. I'll just make an "L" shaped handle to rest against the
stop.

>Just make sure what ever you do, that you underfeed the tap in.
>Procunier's use a cone clutch that locks up even harder as pressure
>increases. Get ahead of the tap a bit and you run the risk of breaking
>the tap, or maybe even something in the head. Underdriving in both
>directions will do nothing more than increase the wear on the clutches
>somewhat, not likely to cause you any problems.

Makes perfect sense. I'll run the spindle as close as I can to 90% and
see what happens. It will radically underfeed coming out but that
shouldn't be a problem.

I also bought a New In the box New Tapmatic N/C-R1 Tapping Head with an
NMTB40 adaptor (which matches my mill) on Ebay for around 25% of the
catalog prices. It covers the next size range up (#10 to 1/2"). I
figure I'll practice with the Procunier which was less than sixty bucks!
Once I get the hang of it, I'll try the other one.

I am guessing that since the spindle is always going in one direction, a
single stop works fine?

Thanks
Fitch