On 01/22/2016 09:58 AM, tom-...@bgp.nu wrote: > I need some advice rigid tapping on an Emco120p lathe.
> When I ran my first attempt at 300 rpm the tap went in, perhaps to full > depth, and then stalled. Well, if your spindle stalled, I'm not sure you have any real options. Even peck tapping is kind of a kludge. You need more spindle torque. If there is no back gear or other way to get more torque, you need a bigger motor. You say 3.5 Hp at 50-3000 RPM. Well, the problem is at constant torque, with 3.5 HP at 3000 RPM you get 0.35 Hp at 300 RPM (assuming no belt or gear changes). I've tapped aluminum fixture plates with 10-32 at something like 600 RPM with a 1 HP Bridgeport. But, 12 mm is quite a bit bigger. Jon ------------------------------------------------------------------------------ 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
