There quite a few Jocks on here that have the Jet/Performax drum sanders. I bought my 16-32 about two years ago and don’t know how I survived before it. It runs just about every day for hours. About 6 months ago it started making a strange noise, like a quick clunking sound, when I turned it on. The smooth sound when running a piece of wood through it slowly changed to chatter and I noticed a slight snipe on each board that I had never experienced before. This went on for a couple months until it got so bad that I finally took the time to start looking inside for the source of the problem.
What I discovered was the rubber bushing that connects the drum shaft to the motor shaft had cracked and was disintegrating. There is no hard mechanical connection between the drum and motor. Each shaft has a collar and the rubber bushing, or “spider” as Jet calls it, sits between the two and absorbs shock when you try to take too big a bite on a board. My machine gets a heck of a workout each day and the occasional user may not experience this problem for a long time, but if you do, it’s harder to get the part than to replace it. The one on the left is the old one.
I found a local Jet parts dealer in Atlanta and ordered the spider. I was told it would arrive in about three days. Of course, multiple phone calls and three weeks later, I finally received it. I figured something like this would happen when the dumbest country boy I every met wrote the part number and my name down on the wrong side of a post-it-note. I won’t go into this story, but the part end up costing $5 and Jet charged $14 to ship it in a little envelope. What a rip off!
This is the two collars with the spider removed and the four motor screws that need to be loosened.
Anyway, it’s pretty easy to change this bushing. Loosen the two set screws on the collar attached to the motor shaft. Loosening the one on the drum shaft does nothing because it can only move toward the spider. Once the motor shaft collar is loose, slide it as far as it will go toward the motor. It won’t move far enough to pull the spider out. There are four bolts that hold the motor to the frame. Loosen all four (I had to back them out about a half an inch) and pull the drum frame away from the motor enough for the spider to fall out. Don’t take the motor screws all the way out. You just need enough to space to get the spider out. Put the new spider in and screw the motor bolts back in. Slide the motor shaft collar over the spider as far as it will go and tighten the set screws. Re-adjust the drum parallel to the bed and you are done. It took me about 30 minutes and it now runs like it did when new.
I don’t know what method that the rest of you use to level the drum with the table, but I use this Angle Perfect that I bought years ago. I no longer use it since getting a Wixie, except for aligning the drum sander occasionally. It has a contact point on top and a wire that connects to the drum. I crank the drum down just until the light comes on then move it to the other side and repeat. It only takes a couple of tries using the adjustment screw to get it level, or quickly test for level.
-- I don't make mistakes, only design changes....www.dgmwoodworks.com