I installed the dust boot today and hooked up my shop vac/Dust Deputy to it in a very unprofessional way with some bungy cords. I suspended the router power cord with another bungy cord; it'll do while I sort everything out. I installed the spoilboard and set about flattening it.
I set the 1" bit to take off 0.005". Where I started at the front it was just about that amount, but the further it moved towards the back the deeper the cut became, and it was at least 1/16" by the time it got to the back, 2-1/2 hours later.
I first thought it was because the torsion box wasn't flat (it's not, but it's not that far off), but later realized that the MDF was humping up as I cut it. I had only screwed it down in 4 places. I bought the MDF more than a month ago, but the only reason I can think of why it would bow like that is because of a moisture imbalance. I'm going to have to do it over.
The good news is that the shop vac did a good job of removing the dust as it was generated, and the Dust Deputy did an awesome job of spinning out the dust and keeping the filter in my shop vac clean. I don't think I'll need to use my big dust collector, which is a good thing from both a noise and power usage standpoint.
The further good news is that the machine works as it should. I can testify, however, that if your toolpath has ANY errors in it there's likely to be an unpleasant surprise. After the main field of the spoilboard had been flattened, the toolpath instructed the bit to make a pass around the perimeter to clean things up. That was fine, except that halfway around the bit started to ramp down another 0.005". I hit the E stop before it did anything worse. Sure enough, there was a command in the Gcode telling it to go 0.005" deeper. When I scrutinized my VCarve drawing I found an unwanted vector that I think was the culprit. The machine does only what you tell it, so you have to be sure you're telling it only what you want it to do.
One of the reasons I bought a CNC was to keep my mind engaged. It's working.
John