ER32 Collet Chuck for Proxxon PD 400

[Wongster]

Nothing much to show lately as I haven't have much time in the shop. This morning, I spent about an hour continuing where I left off. From 90mm dia, I managed to get it down to 76mm. Took me about 1.5 hours with some calls in between from my clients.

In the session, I replace the Sherline insert tool with the Proxxon HSS roughing tool. It was till at an angle so that I do not have too much unintended chamfer on the shoulder. The slight slope will be squared off later when I reach the desired 50mm dia for the boss.

I found that I'm able to cut deeper with this tool without the strange sound I heard earlier. But I stayed on at 0.5mm doc (1mm off dia each pass). Also, I was turning by hand using the saddle handwheel. This allows me the control over the feed. Like what was suggested, finishing is not critical at this point. Using the power feed, I have the problem of long stringy swarf bundling together. I've to stop several times each pass to remove them. By hand, the swarf just broke off when I ease off the feed. Closer to the shoulder, I would just wind back the saddle to remove them.

This is the angle I set for the HSS roughing tool:



This is where I am at:



I may have an hour later to do some work. Hope to finish off the boss today.

May I ask, should I start drilling and boring the centre hole after roughing out the boss or it should be done after I flip the stock over to clean out the other side?

Regards,
Wong