Troubleshooting Wavy Lines with a Widebelt Sander
We had a machinery repairman here today. He is a former Stiles mechanic and presumably reasonably qualified. His determination was that the steel rollers and rubber rollers were in very good condition. He could not find any problem with them. He could also not identify the cause of the wavy lines. He took a sample board with him to consult with others in his field. To try to get in front of this a little bit I thought I would ask here if anybody else has seen a problem like this, and if anybody has a suggestion where to look?
From contributor G:
Chatter marks are so easy to identify now I'm thinking youíre probably up on all that. Another thing you can do is turn the belt around and see if the wavy line follows with the belt or remains unchanged (in the exact same position). This can show that the belt is or is not the problem. A defective belt or a damaged belt (staple in wood) can give a slightly raised wavy line, (area with abrasive removed from belt by staple) and will usually follow with the belt when itís reversed.
From contributor U:
If it is wavy running front to back, then it is most likely the belt because the oscillation plus forward motion is what creates it. If it were a roller defect, then it would just be a straight line.
From contributor T:
Sometimes just changing the belt (even if it is new) will get rid of this. Also you can take a piece of chalk or lumber crayon, flatten out a side rubbing on an old sanding belt and then gently rub your sanded piece of wood. You will see what else is going on too.
From contributor K:
We have the same machine and those are oscillation marks. You may need to adjust the air regulator or change the air pressure on the heads, it could be bad belts. We also use 3M 970dz belts and sometimes they are defective.
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