Power case trimmer- RPM?

[skeet_man]

So I'm setting up my benchtop lathe to trim cases. Bought a Forster replacement shaft which I centered in a 4 jaw chuck, then I hold the case in the tailstock with a Lee case holder in a drill chuck.

Only did 10 cases so far, turning out really nice. It'll be quite a bit quicker when I get a DRO on my tailstock and don't have to rely on the crude hashmarks.

Turned them around 600rpm, I could go up to 2k though. Any thoughts on a good range? I cut these 10 dry, anybody use cutting oil on the cutter? I was getting some chips sticking to the cutter.

I also have a benchtop mill that I can hold the chamfer/deburr tool in w/ a collet. I noticed that I had to keep the RPMS fairly low or I got a lot of chatter.

Speed really isn't an issue since I am a low volume shooter, but I just thought I'd pick brains and maybe save myself some time experimenting.

 

[Catfish]

If it works don`t fi it. The difference in trimming cases is very small with RPMS of !0 and RPM of 1,000. I like faster RPM but reaming inside and out side of case neck for taper it all works out about the same as time is concerned. If your getting what you want stat with what your doing.

 

[Joe R]

So I'm setting up my benchtop lathe to trim cases. Bought a Forster replacement shaft which I centered in a 4 jaw chuck, then I hold the case in the tailstock with a Lee case holder in a drill chuck.

Only did 10 cases so far, turning out really nice. It'll be quite a bit quicker when I get a DRO on my tailstock and don't have to rely on the crude hashmarks.

Turned them around 600rpm, I could go up to 2k though. Any thoughts on a good range? I cut these 10 dry, anybody use cutting oil on the cutter? I was getting some chips sticking to the cutter.

I also have a benchtop mill that I can hold the chamfer/deburr tool in w/ a collet. I noticed that I had to keep the RPMS fairly low or I got a lot of chatter.

Speed really isn't an issue since I am a low volume shooter, but I just thought I'd pick brains and maybe save myself some time experimenting.

I assume you're using some sort of mandrel to guide the case against the cutter.

If you increase the speed of you will be increasing the heat generated by the friction of the case neck against the mandrel then bad things start to happen. There is no benefit from higher speed and there are negatives.

Personally I prefer to turn my necks at lowest speed I can manage with my variable speed drill. I used to have a Gracey neck turner that spinned at 3200rpm and I sold it because it was problematic.

Regards,

Joe