In our door shop we manufacture roughly 150 doors per day. We use an edge sander and widebelt, then putty the joints and sand with 5" orbitals. We have not found a machine that can profile sand and remove putty for a nice finish. Any process/equipment advice is welcome!
From contributor J:
You probably don't won't to hear this, but skip the brush sanders. They don't work as advertised and will give you a lot of grief. We make a little over 400 doors a day and after the doors leave the widebelt, they get an edge profiled on them. Then it's off to the sanding tables where several people putty, hand sand (some with orbitals and some with blocks) and check for defects. By far this is the biggest bottleneck. After they are hand sanded, then it's off to the wide orbital, then they are drilled and bound for shipment.
This is what the brush sander will not do.
1) It will not remove cross grain scratches. Only one machine will do that and it's an automatic orbital sander.
2) It will not remove putty from your door. It might smooth it a little, but not calibrate it off like you want.
3) It will not remove scratches or other imperfections in your door.
It is estimated that in the United States there are about 2000 brush sanders sanding kitchen cabinet doors in production lines before sealer and after sealer. I represent the QuickWood brand of finishing sanders.