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Wide Belt Sander Issues10/14
I have an SCM Sandya 20. 3 heads, 120,150,180 sandpaper set up.
Could be oily wood losing traction on your conveyor. Try wiping the bottom of a cedar board with acetone right before you run it, wiped side down.
At a minimum I'd say that your hold downs or shoes might not be set right. The harder wood is giving a bit more back pressure which can stop the parts.
I would change out the 120 for a 100 grit in a heart beat. Make sure the 2nd head is removing 0.005" and the 3rd head is removing 0.002". If the 3rd head is a combi-head, take 0.002" on the drum and 0.001" on the platen.
Once you have this combo set up you can watch the parts moving through the shoes or rollers after the 1st head to be sure they are rolling and gripping.
If the conveyor is slick it can be dressed with an 80-40 grit on the front steel drum, but only if the machine is properly calibrated.
You can use a 5" random orbital sander with 120-100 grit. Let the sander rest on the table with not much pressure all the way around and then move over 1/2 the diameter and repeat. This will rough up the rubber a bit and make it more sticky with out the risk of grinding the conveyor at an angle.
Shoot me a pm if you would like to talk about it. I work on wide belts for SurfPrep sanding for a living.