On Friday 22 January 2016 13:08:09 John Thornton wrote: > I was close too trying to deep hole tap the 7075 but close didn't cut > it. I had to buy the recommend bit. Is your spindle stalling out? Oh I > read your initial post again, cool thing in LinuxCNC the axis follows > the spindle so if it stalls nothing moves. > > JT > Correct John. Stalled, kill the spindle power only, grab a chuck wrench and back it out, the carriage follows the hand reversal just like a hungry puppy. Gotta love it. :) > On 1/22/2016 11:43 AM, 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 > > > >> 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 > > ---------------------------------------------------------------------- >-------- 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
