Coring on DVR XP

[Bernie Weishapl]

I have the DVR XP. I core at about 450 to 650 and have it set to hard. Haven't had a problem coring 15" blanks. Keeping your knives sharp it key. If you didn't sharpen them when you got it you probably should have. Like Faust said you have to sharpen those knives such as the #3 after 1 or no more than two cores. #2 I can get 3 cores and #1 I can get 4 cores but no more than that for each one.

[Mark J Porter]

My friend, who got me hooked into this vortex, turns on a DVR and has cored hundreds of bowls with a Oneway system. He says to keep the tools sharp and frequently clear the shavings from the bowl blank. Let the tool do the work and don't force it. I have never seen him work it hard enough to heat the head it stock. If it starts cutting hard, he removes the tool and blows out the shavings. I have used his lathe and tool to core several blanks. I could force it hard enough to slow and almost stall the lathe. I had no problem after he showed me to not force the tool and to let it do the work.

[George Thompson]

The trick with the DVR and somthing that Nova will not tell you is if you run your lathe at 600 to 650 RPM it will develope the most HP and has the best cooling. I always do all my coring at that speed and yes the shrper the better.

George

[Reed Gray]

The newer Mark 8 McNaughton blades have a pretty good curve to them. Some of the older ones did not. The blades always drift to the outside as you cut. My reasoning is that the last 1 inch of the tip goes straight rather than following the curve of the blade, so the blade follows the tip and not the curve of the blade. No problem on a shallow/small core, but a bit of a problem on a larger core. I have bent the tips in just a hair on a few, and that straightens up the cut a lot. If you can get one of the plastic circle templates, lay your blades out on them and see how good or bad they are. John Lucas had an article in the last Woodturning Design magazine on different bending jigs. Kel McNaughton does not agree with my reasoning. The last time I talked to Mike Mahoney, he said, "hmm, you might have some thing there". The wood variety depends a lot on how often I sharpen. With Madrone (nearest wood I can think of cutting wise is pear) I can easily get several bowl cores with one sharpening. With Walnut or Oregon Myrtle, I can get one. Same with locust.

robo hippy

[Trevor Mills]

Just want to thank everyone for their input. I cored 3 x 15.5 " bowl blanks today and each one was easier than the one before. Amazing what a faster RPM, a fresh edge on the knife, and the proper torque setting will resolve.
Thanks again!
Trevor