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Longitudinal lines on wood caused by wide belt sander

5/5/18       
Luis Rivas Member

I have Longitudinal lines on the wood after it has been sanded with a wide belt sander what could be the cause ?

5/5/18       #2: Longitudinal lines on wood caused b ...
Leo G Member

Cheap belts with a not so great joint. Out of round drum.

5/6/18       #3: Longitudinal lines on wood caused b ...
rich c.

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.

5/6/18       #4: Longitudinal lines on wood caused b ...
duster

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.

5/7/18       #5: Longitudinal lines on wood caused b ...
bill Member

Post a photo of the defect if you can.

5/7/18       #6: Longitudinal lines on wood caused b ...
Matt Krig Member

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

5/7/18       #7: Longitudinal lines on wood caused b ...
rich c.

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.

5/8/18       #8: Longitudinal lines on wood caused b ...
David R Sochar Member

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.

5/8/18       #9: Longitudinal lines on wood caused b ...
Leo G Member

Well since Luis hasn't responded, I guess it really doesn't matter or wasn't that important.


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