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Grizzly 18-36 Drum SDander5/11
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. The machine is just 2 months old.any advise will be appreciated. Thanks
18/36 tells me it is an 18" drum with one end open for wider work. These are lightweight machines. Just because you set a thickness does not mean iiiill be that thickness.
I think you will only be able to remove a few thousandths per pass. The 'hills and valleys' are created by the open end and a belt that is less than capable. Most sanders require better belts. The low cost sanders especially will require the best belts one can find.
Thanks for your response. Do you have a preference on the belt manufacture?. Yes I have an open end. I changed paper from 120 to 100 and seem to do better. But I noticed if I rotate the board 90 degrees I get the valleys. I have the sander head as close to parallel as can be. So as long I do not do wider than 18 inch it seems to be good.
So do you really have a drum sander, or do you have a belt sander? Why would you need belts for a drum sander? I think your expectations are too high for using an $800 machine to surface 36" wide panels in a commercial situation. You're getting exactly what you paid for.
yes it is a drum sander I have 4 belt sanders so I know what they are. David suggested a new belt that pulls the wood through the drum head.
I agree with rich that you should not expect to get perfect - even good - results with the equipment you have. Getting the center to level and keep off the other defects will be near impossible. Drum sanders are a relic of a time before wide belt sanders were developed. They clog with glue and overheat. Wide belt sanders benefit from a wide surface that will be sanded in one pass, and a longer belt is better, for heat dissipation.