On Friday 22 January 2016 12:43:35 tom-...@bgp.nu wrote: > This is the tap I am using: > http://www.mscdirect.com/product/details/58607482?rItem=58607482 The > drill I am using is 10.5mm which is 0.875 of 12mm so I would say that > seems fairly large. The OSG online tool recommends a 27/64” (10.7mm) > drill, so I am very close (0.008” difference). Also, if I was using > OSG's tap they recommend 23.8764 IPM which equates to a spindle speed > of 400 RPM. I can try that (I used 300 RPM), but I suspect I am going > to have the same (torque) issue I had before. And perhaps the answer > is I just don’t have enough torque at low spindle speeds to do it in > one pass… > > -Tom
Spinning a 12mm tap in my G0704, in low backgear, will likely require a not more than 1/4 turn deeper per peck cycle. Its only a 1 horse. A 10mm tap made it do some serious belly dragging, but did get it done at a turn per peck. It also did a 3/8 USS tap into a slightly undersized hole in a white ash jig base, but I used all the tap, at about a turn per peck. Made great threads in the wood, and for a change, the studs stood dead straight up! > > On Jan 22, 2016, at 12:00 PM, John Thornton <j...@gnipsel.com> wrote: > > > > What kind of tap did you use? I use only ElectroLube coated taps > > from OSG. OSG has an online tool to select the correct tap and drill > > for each job. I once had to deep hole tap in some 7075 and my normal > > taps broke off. I used the tool and got the right tap and drill so > > the hole size was correct for the job. Tapping charts usually use > > 75% thread depth which is usually OK for a depth = diameter, for > > deeper depths you need a bigger hole. > > > > JT > > ---------------------------------------------------------------------- >-------- Site24x7 APM Insight: Get Deep Visibility into Application > Performance APM + Mobile APM + RUM: Monitor 3 App instances at just > $35/Month Monitor end-to-end web transactions and take corrective > actions now Troubleshoot faster and improve end-user experience. > Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > _______________________________________________ > 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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
