> -----Original Message-----
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: Tuesday, August 01, 2017 7:49 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Question on Z backlash vs rigid tapping
>
> On Tuesday 01 August 2017 17:14:55 Ken Strauss wrote:
>
> > It doesn't answer your question but have you considered using thread
> > forming taps? Certainly no gullets to fill!
>
> True Ken, but what is the difference in required torque? I am afraid that
if I use
> a peck routine, it might get stuck and the spindle would not have the
power to
> back it out. Not to mention the shanks aren't big enough for an ER-32
collet to
> get an adequate, slippage free grab at those torque levels. Thats only a 1
hp
> rated motor, and I'm running in backgear at 200 revs to even turn an 8mm
> tap.
>
> Thanks Ken.
I don't really understand your comment that you have insufficient torque to
tap completely in one go. Why does pecking reduce the torque required?
If this is a thru hole you can use a spiral point ("gun") tap to push the
swarf ahead of the tap and out of the bottom. If this is a blind hole then
use a spiral flute tap to extract the swarf upwards. I don't believe that
you mentioned the material being tapped or the depth.
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