The general tap hole size goes out the window with many materials and thread depths and brass as you know is not like tapping cold butter...
JT On 1/23/2016 5:48 AM, andy pugh wrote: > On 23 January 2016 at 11:28, Erik Christiansen <dva...@internode.on.net> > wrote: >>> The OSG online tool recommends a 27/64” (10.7mm) drill, so I am very >>> close (0.008” difference). >> That only gives 60% thread engagement, if counting on my fingers is >> working for me. > Most digital calipers seem to have a table on the back. Mine says > 10.2mm for M12 x 1.75 > (Which is no help, as this is M12 x 1.5) > M10 x 1.5 is given as 8.5, which ties in well with the 10.5mm > suggested for M12 x 1.5. > > I have heard that there used to be a rule that new tools (taps, files) > were used only on brass until they started to go dull, then they would > be transferred to work on steel and another brand-new tool would be > brought in to work on brass. > ------------------------------------------------------------------------------ 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
