On Saturday 23 January 2016 06:18:55 Peter Blodow wrote: > Tom, the formula for drilling for metric threads is simple: nominal > thread diameter minus the pitch, e.g. 12 - 1.5 = 10.5 mm for M12, or 6 > - 1 = 5 mm for M6 etc.
Does that not give a 100% thread? I was under the impression we use a .85 multiplier. I made a couple 3mm holes yesterday when carving up a temporary camera mount, applied that rule and used a .089 # drill as the starter hole. Had about the taps length to do as the screws I had were 12mm long and the material was 1/2" thick. Not wanting to load up the tap and break it since it was a crap Irwin/Hanson, I pecked it by hand from the mdi command line, 3mm at a time. Worked great. But I need to junk that set of drills, they are gold painted wheel weights & only good for 3 or 4 holes in alu before the edge is gone. I had bought one of those 115 piece things for about a $30 bill several years ago, and half of them have burned up or broken, and most are too small to be worked over by the original drill doctor. Its good for big bits, but has bad centering problems when you get below about 3/16" Looking at the fleabay offerings, what does this group think about Drill Hog? Like these: <http://www.ebay.com/itm/Drill-Hog-60-Pc-NUMBER-Drill-Bit-Set-Wire-Gauge-HI-MOLY-M7-USA-Lifetime-Warranty-/181752876465?hash=item2a5150cdb1:g:x4oAAOSwMmBVrQ3a> [...] Thanks everybody! We have about 14" of snow on flat areas, and its still building, perhaps an inch/hour. A winter wonderland out, if I didn't have to clear some of it when it finally does stop. I stuck an arm & camera out the back door, and my rider and 20 kw standby are just tall lumps in the snow, completely covered. For those of you sort of on the "right coast" with me, orders from Grandpa Gene: don't go have a heart attack shoveling it. Ya'll hear? 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
