Question about Bosch 1274DVS 3" x 21" Belt Sander
My Bosch belt sander stopped working. I was using it to sand out parquet floors and turn it off to use a smaller sander to finish up a corner and it the belt sander would not come on now. No sounds comes out. Looks like a power supply problem or a switch? Any ideas?
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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
I'm not familiar with that particular model, but they are virtually all replaced the same way. There are a few screws through the pad into the base. Simply remove them and screw the new pad on. You'll see that it's quite simple once you get the new pad in your hands.
Just be careful not to strip the head of the screw: use the right size screwdriver tip.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!
Posted on Apr 02, 2009
This means the sander has been droped and the pad support and/or the bearing orbit has been bent, maybe even the motor shaft. Never leave any power tool sitting on a bench, always set it on the floor, it will end up there at some time anyways. You can try replacing a part at a time and spend a lot of money and time, but is it worth it?
Posted on Jul 18, 2009
If the drum has the bar clamp with the 3 screws make sure the bar is set so the screws are flush when tightened down. If you reverse the bar clamp the screws will stick up a fraction and cause this grooving in your floor.
Posted on Mar 21, 2010
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