Single point threading - my best was a M6 x .5 20mm depth using a Micro-100 solid carbide mini threading bar in 303 Stainless. Thread milling - #6-32 with a usable thread depth of .470" in 6061 AL.
Andy's boring head tapping (X axis) - I have lost many carbide threading inserts which chipped when run backwards. On inch thread engine lathes with a metric change gear you are usually required to not disengage the half nut during the threading operation so you back off the cross slide and reverse the spindle to get back to your start point. If you don't back off the part deflection puts enough pressure on the insert tooth that it tends to chip. For some insert geometries you can get 5% Cobalt HSS inserts and these are ideal for this type of usage. That said - I'd do it like Andy did since its a one time do or die type job and use a number insert points as needed. Greg ------------------------------------------------------------------------------ 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
