On Monday 25 January 2016 18:34:10 John Figie wrote: > Why not reference the Machineries Handbook? > I have a copy of #27. Its been less than Biblical to me.
1. Hard to find in the index. 2. Once you THINK you have found the proper table, the column heading abbreviations are quite often so terse as to be worthless. It should be called "tap drill size" "body drill size" etc. I forget what sort of shorthand they use, but its not always readily translatable to a native 'Merican reader who was taught phonetics 75 years ago. > https://www.google.com/search?q=diyhpl.us+%E2%80%BA+papers2+%E2%80%BA+ >27_Thread_09A&oq=diyhpl.us+%E2%80%BA+papers2+%E2%80%BA+27_Thread_09A&aq >s=chrome..69i57.1787j0j4&client=ms-android-att-us&sourceid=chrome-mobil >e&ie=UTF-8 > > On Jan 25, 2016 4:33 PM, "Peter Blodow" <p.blo...@dreki.de> wrote: > > Erik, > > right tomorrow morning I'll copy another table (fine threads) for > > you, for today I have had sufficient wine for not attempting (I > > found a 30 year old bottle this afternoon in our rarely used > > basement room). > > > > In case you need the size still tonight: the formula: diameter minus > > pitch is always correct for metric threads, also for fine threads as > > M12 x 1,5, as long as they are 60 degree, als Andy stated. I admit > > that they get easier to cut and breakage is less likely as the > > prefabricated bore is larger, with the limitation of bore diameter > > equal to outer thread diameter. > > > > Good night > > Peter > > > > Am 25.01.2016 16:07, schrieb Erik Christiansen: > > > On 25.01.16 14:28, Peter Blodow wrote: > > >> I have run a machine shop with up to twenty workers for 36 years > > >> and I never heard about percentage of engagement etc. > > > > > > Peter, > > > > > > On the 10.2mm hole for M12x1.75, given in the table you posted > > > yesterday, engagement is 84% - very strong, but hard on taps. > > > > > > Industry standards are necessary, and we rely on bought bolts > > > conforming to them when we tweak % engagement in the tapped hole > > > to receive them. > > > > > > Please have a look at: https://en.wikipedia.org/wiki/Screw_thread > > > under the heading "Thread depth". You will discover that nefarious > > > tapping practices are institutionalised beyond anyone's ability to > > > eradicate. ;-) > > > > > > The text at the OSG calculator, cited upthread: > > > http://www.osgtool.com/Technical.asp?tid=1&id=1 > > > is also relevant. To wit: > > > > > > » > > > To minimize tapping problems and lengthen tool life, use the > > > largest drill possible to produce a minor diameter that will > > > result in the lowest percentage of full thread consistent with > > > adequate strength. A minor diameter that provides a 55% to 65% > > > thread is sufficient for most requirements, but in some cases a > > > higher percentage of thread may be necessary to conform with the > > > minor diameter limits of the thread class specified. > > > « > > > > > > Seriously, once we buy an ISO bolt, we can use it as circumstances > > > permit. In industry, you just need an engineer to sign off on > > > that. > > > > > > Would you like to post the drill size your tables specify for > > > M12x1.5, and we'll check the engagement on that? (The table from > > > yesterday included only M12x1.75, so does not help Tom, or allow > > > comparison with our preferred hole size. ) > > > > > > Erik > > > > -------------------------------------------------------------------- > >---------- > > > > > 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 > > > > --- > > Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. > > http://www.avast.com > > > > > > > > -------------------------------------------------------------------- > >---------- 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
