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Longitudinal lines on wood caused by wide belt sander5/5
I have Longitudinal lines on the wood after it has been sanded with a wide belt sander what could be the cause ?
Cheap belts with a not so great joint. Out of round drum.
Too fine of grit, too fast of feed, too much material removal with each pass, poor belt cleaning, poor dust collection
A picture would greatly help.
Most likely, a butt splice on a worn belt. Everything Rich mentioned will wear your belts out prematurely.
Put a new belt on and sand the same board or panel and see if it goes away.
Post a photo of the defect if you can.
Most likely seam chatter from the thickness change with the seam tape on the belt. That said there are a huge number of contributing factors to abrasive chatter marksPretty good article detailing wide belt issues: https://www.woodworkingnetwork.com/articles/widebelt_sanding_tips_127702098.html
Doesn't longitudinal lines mean from one end to the other, the long way? Seam issues put the lines in from side to side in my experience.
Yes, longitudinal would mean running along the length of the board, not across the width of the sanded part.
If this is the case, then it most likely is a place on the belt that has the abrasive removed in part by sanding a screw or nail head, or loaded grit where thermoplastic glue or even wet glue has coated the grit.
The end result is somewhat like a nick in planer knives.
Well since Luis hasn't responded, I guess it really doesn't matter or wasn't that important.