On Wednesday 02 August 2017 01:10:14 dave wrote: > From the dept of various information: > https://www.parlec.com/Parlec/media/technical_specs/Tapping-Speeds-Tor >que-Requirements.pdf?ext=.pdf > http://www.tapmatic.com/tapping_questions_torque_setting_data_for_hss. >ydev > > Dave
Thanks Dave. I've been looking for something like that for a long time. I think I can translate this to metric close enough for the girls I go with. I expect the rpms needed for many taps and materials would rather handily exceed the z drives ipm though. That, if useing G33.1 would make some overtravel vs rpm charts to be cobbled up, very important for blind holes... I have some extra hal stuff I can watch with a halmeter, but the data is in encoder edges and needs scaled into revolutions, then the revolutions by the tpi so I'm seeing actual distance. Its looking like I need to loadusr some math stuffs to make it translated into travel distance before being peak detected and displayed. IOW make hal do math. Sounds like a slower thread, similar to what I'm doing on the lathe for the jog dials. And probably done when that itch strikes again... > > On 08/01/2017 07:34 PM, Gene Heskett wrote: > > On Tuesday 01 August 2017 20:33:11 Ken Strauss wrote: > >>> -----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? > > > > 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 > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
