ER32 Collet Chuck for Proxxon PD 400

[Wongster]

The process of turning the nose is a long one. For the past couple of hours (with interruptions), I only managed to bring the diametre down from 100mm to 90mm. The target is 50mm for a length of about 25mm. Consulting the chart on the lathe, I'm supposed to set the belt to spin at 80 rpm and change it to 160 rpm when I'm down to 80mm diametre. I tested depth of cut at 0.1mm to 0.5mm. Not being comfortable going at 0.5mm, I reduced the depth to 0.4mm. I adjusted the spindle speed to 160 rpm and it seemed to be working fine.

I'm not sure if I'm getting this speed and depth thing right. A video was taken with my iPhone showing the cut with spindle at 160 rpm, depth of 0.4mm, and with autofeed at 0.07mm/rev. I was told that the steel block I bought is mild steel. Wonder if anyone can tell just from this video that I should adjust any of my settings (speed, depth of cut etc).





Regards,
Wong