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I have a 18x36 Grizzly drum sander and it is leaving peaks and valleys in the wood. I am using 100 grit paper and have adjusted speed rate from low to high and. I adjusted the amount of sanding to almost nothing and up to 1/32 and still leaves peaks and valley's across the width of the work piece. any advise will be appreciated. Thanks
Are the belt pressure rollers clean? Trash on them would push down the belt. Making your valleys. Are the rollers smooth? Grooves in the pressure rollers would give you peaks.
Thanks for the reply Eddie. I did not mention that the machine is 2 months old. I will check to be sure of that, also I went and recalibrated the head for parallel to table and played with speed control. I found one speed that works the best but when adjusted to a slower speed or faster the grooves come back.
I don't use the grizzly, I've used Powermatic and Supermax twin drums.
Between the two, the Supermax is the only one that ever left peaks/valleys and it's always because feed speed is too high. If I turn the speed down a little, it usually goes away.
The other issue you may be having is an out-of-round drum. I've never seen that before but it would certainly cause your issue.