Old fairy tale, fact ist that brass (depending on the zinc content) needs a lower cutting angle then steel, both tools ought to be as sharp edged as possible. For holes in brass larger than 10 mm, I use drill bits with a 90° edge (broken edge, as we say) since a 12 mm bit cougth once and almost smashed my ellbow by flinging the machine vise a me... Peter
Am 23.01.2016 12:48, schrieb andy pugh: > 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. --- 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
