Question about Black & Decker BR300 3''x18'' Belt Sander
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Posted on Jan 02, 2017
You did not specify how the sanding discs are meant to be attached to your sander's backing pad. My experience with this type of problem is material from the sanding process builds up on the backing pad and does not allow the sanding discs to adhere properly. If you have a velcro type system, clean the hooks on the sander's backing bad by soaking the pad's face in a plate of paint thinner for 20 to 30 minutes then use a wire brush to remove the rest of the paint physically. For adhesive pads clean the sander's backing pad surface with denatured alcohol. Do not use isopropryl or rubbing alcohol as this may not be 100% alcohol and could contain a lubricant like glycerin. When the sander's backing pad is completely dry and clean it will hold adhesive backed pads fine. Flaky paint is best scraped off before sanding, use a wide putty knife or a paint scaper to remove large flakes before sanding. This will minimize airborne dust and cleanup. For best results with adhesives, always keep your surfaces clean! Good luck and happy sanding! Michael Mittelsdorf
Posted on Jan 10, 2009
SOURCE: belt won't stay on belt sander
Check first that you have retensioned the belt... i.e. when you removed the other belt, you would have had to pull on a spring-loaded lever to remove the belt tension before you added the new one... make sure the tension lever is flipped back in to ensure the new belt is tensioned...
Next, and the likely problem you are having, is belt tracking... There should be an adjustment knob up near the front of the sander near the front roller, either on top of the front part of the sander, or to the side near the front roller... When you turn this knob, it makes the belt track either left or right over the sander's base. This knob will allow your belt to run square and true and not spin off to one side...You need to adjust the tracking using this knob while the belt sander is running and with the new belt tensioned and in place, so turn the sander upside down, and power it on with one hand, then turn the knob with the other hand whichever way is needed to have the belt track square and in the middle of the rollers. Make small adjustments on the tracking knob to begin with. They can be sensitive at times.
That should stop your belt spinning off to one side.
Posted on Mar 18, 2009
SOURCE: Sanding Belt Slips Badly
Check and see if the pulleys on the sander are not glazed this somtimes will cause the belt to slip. Give them a good cleaning. If this does not help there is a good chance the spring on the belt tensioner is weak and need changed.
Hop this helps
Posted on Apr 14, 2009
SOURCE: broken drive belt on belt sander
My answer comes almost a year after the original question, but I'll post it anyway for those who end up here after a search.
Black & Decker no longer supplies drive belts for the BR400 sander, but you can get a replacement elsewhere if you know what to ask for.
The belt is a synchronous, single-sided "XL" series belt, and mine had 120XL031 printed on it. The belt width is 0.31in or 5/16in or 7.9mm. Its pitch (distance from tooth to tooth) is 0.20in or 1/5in or 5mm. Its total height is 0.09in, and tooth height is 0.045in. It has 60 teeth, making the total length 12in.
I found a replacement at sdp-si.com, part number A 6R 3-060031.
Look here for timing belts (inch), then narrow the search for single-sided, .200 (XL) pitch, 60 grooves, 5/16 width.
Posted on Jun 16, 2010
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