I've got a Jet 10-20 drum sander. I've had it and used it for several years. Today I used it for the first time since we moved and discovered a strange problem.
I was thicknessing some maple boards by taking them down to 1/16" oversize on my planer and then taking off the rest with a few passes through the drum sander. Something I've done many times with no problems.
The boards are 4/4, about 6' long and 4"-8" wide. I set up infeed and outfeed stands, each about 3' from the drum. The sander was set to take off about 1/64".
What I get is a board that is, for example, 49/64" about one foot in,
50/64" two feet in, and 51/64" three feet in. Then it starts getting thinner again until the other end. It's like the drum is gradually going up and then back down.I've tried running either face up and either end in first. Seems to make no difference. I'm stumped. Help!
I'll call Jet tomorrow, but I thought I'd see if anyone here had a solution. Probably more expertise here than at Jet :-).