On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote:
> > -----Original Message-----
> > From: Gene Heskett [mailto:[email protected]]
> > Sent: Tuesday, August 01, 2017 7:49 PM
> > To: [email protected]
> > 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?
Because I can cut 1/4 turn at a time with the motor inertia.
>
> If this is a thru hole
It is, in 3" od rolled and welded joint utility pipe. Nominally .100"
t0 .125" wall, nothing precise about it, just barely round and straight
depends on how many inches long the straight edge is. 2 or 3 inches
maximum run IOW.
> you can use a spiral point ("gun") tap to push
> the swarf ahead of the tap and out of the bottom.
I think that would describe the tap I am using except the flutes and
cutting edges are straight.
> 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.
Std cheap pipe, fairly free machining stuff. .125" thick wall worst case.
Thanks Ken.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
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