Re: Case neck turning tools...
Good idea with the masking tape on the pumpkin. I should do that just as a reminder.
I bought the Sinclair case driver to attach straight to a cordless screwdriver, but what I found was that there was far less wobble with the case chucked directly into a drill like you have it.
Interestingly, I ran a bunch of cases using five techniques:
1) Drill Press using Sinclair driver and Pumpkin clamped in a vise
2) Cordless screwdriver using Sinclair driver and holding both the Pumpkin and the screwdriver
3) Drill Press with case chucked directly in and holding Pumpkin
4) Drill Press with case held by Midway driver and holding Pumpkin
5) Manual method (using the Sinclair Driver with a screwdriver handle)
I measured 25 cases using each method measuring at 4 points, and I found that manually yielded the most consistent results (but also took the longest), but second in consistency was the case chucked into the drill press and holding the pumpkin with my hand. The worst was the cordless screwdriver. Technique is a lot of it, so I am sure that I could improve on my results with the cordless, but I have found that I am better off fixing the drill and moving the turner.
Chucking the case directly in leads to better results because you are getting all of the case runout from the head to the mouth plus whatever runout is in the driver. By chucking it in, you are only getting the runout from about mid-case to the mouth. There is still some wobble (I was using virgin Lapua), which causes an uneven cut. And for the record, while the manual cases did not look as smooth, they measured better than the automatic ones, so visual case inspection doesn't cut it. You have to measure.
