I have enough work coming up in the next few months that I could justify adding one more piece of equipment. I picked up a planetary grinder setup for dry grinding. The conventional grinder works but takes a long time and requires enough pressure that the thoughts of doing more than one kitchen make my arms hurt. The planetary grinder gets the job done about 5 times faster and has enough weight that all I have to do is hold on. This should pay off in time very quickly.
For a test I quickly ran up through 3000 grit on spare piece in the garage. Although you wouldn't go up to 3000 for a kitchen or bathroom, I just wanted to see how it works. This is a 30 inch by 20 inch piece and it took less than 20 minutes to work from 50 to 3000. The general surface texture is much better/more consistent than the single head unit.
It will be a busy fall.
On-going and Up-coming Projects:
1. Concrete planters
2. Fireplace surround, bathroom vanities, bathroom sink, and bar top for a new remodel
3. Island countertop
4. Kitchen remodel