I have one of those made for wood (not drywall), and it takes FOREVER. Overheats and burns if you don't go super slow. Next I bought one of those crazy heavy 7" hole saws you can buy on Amazon in just about any size, and it was pretty clunky too. I ended up using a router with a hole jig, but I'm more going for holes rather than pucks. Lathe is probably the right answer. Here's a super cheap one that I recently bought for another project: https://www.amazon.com/gp/product/B092C1T6GH/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1