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Uneven widebelt sanding

3/26/15       
Kevin Member

Can anyone offer an idea as to why I'm getting uneven sanding across the width of my doors? Sanding with 150 and platen down. Should I change felt and graphite on platen? Hopefully the picture shows what I'm talking about. Thanks.


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3/26/15       #2: Uneven widebelt sanding ...
Adam West  Member

Website: http://www.surfprepsanding.com

The brand and configuration would help. Usually this is caused by over pressure but I need more info to nail it down exactly.

If this is a single head machine your platen should only be a tiny bit lower than the drum.

I would back off the platen and run just the drum. Then stop everything without moving the table. Run the part under the head and slowly lower the platen while rotating other belt or moving it back and forth until you feel some drag. This is your starting point. You might drop it a tiny bit more but only if the scratches are still short.

This will have the drum and platen working together to produce the flattest part possible.

If you are over taxing your belts even a drum can do the same rounding.

3/27/15       #3: Uneven widebelt sanding ...
Kevin Member

Thanks Adam. You described exactly what was going on. Too much pressure from the platen. I backed off until I saw what looked like ridges from the drum, then lowered the platen until the ridges were gone but the part was flat. Its sanding great now. I had no idea how much the platen affected the piece, and how sensitive the adjustments are. Thanks.

3/27/15       #4: Uneven widebelt sanding ...
chuck crawford

Adam, You have the most informative posts on sanding, equipment, technique etc. that I've ever seen. Just wanted to say thanks.

Wish I could hire you to spend some time in my shop and get our sanding lined out. That seems to be our biggest time eater and sometimes causes problems with our staining.

Chuck

3/29/15       #5: Uneven widebelt sanding ...
Adam West  Member

Website: http://www.surfprepsanding.com

Chuck,

If you would like you can send me an email and we can try to stop by sometime when I'm in your area. It doesn't cost anything for me to look at what you are doing and make recommendations.

I always have our pneumatic sanders, disks, and sponges with me to play with so you might find some stuff you like. I don't really sell stuff. I just go and sand and people decide what they like. Any shop visit that doesn't result in me getting dirty is usually a waste of time. :-)

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