Question about Bosch 1276DVS 4" x 24" Dustless Variable Speed Belt Sander

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The belt on my 4 x 24 sander always run off the outside. I have the tracking adjustment turned all the way (ccw) out and it doesn't help. Turning it in only makes it worse. It is maybe 15 years old but has seen very little use. If I sand holding more pressure on on out side I can controll the run out to some degree but causes it sand unevenly.

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Hi,
Have you tried different belts??? sometimes you can get a pack of belts that will not track...I would get another pack... don't use from the same as they were all made at the same time...and try it with new belts...
Also make sure there is no play in the wheels with the belt off...


heatman101

Posted on Mar 19, 2011

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I have a power devil belt sander, but every time i turn it on for use the belt works its way off... i bought this sander second hand at a boot sale so im thinking is there supposed to be an outside guide...


no there is not anything missing, you need to adjust the belt by turning the black plastic adjuster knob which guides the belt to the left. I have found that whilst using the sander you sometime need to adjust it further. If you adjust it too much the belt will hit and grind the plastic casing of the sander.

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If this is a belt sander then they have a tracking adjustment knob. You will need to adjust it so that the belt stays on and doesn't want to walk off.

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I have borrowed a ryobi industrial belt sander, I have put the sanding belt and repositioned the latch. When running the sanding belt keeps moving out.


There will be a tracking adjustment somewhere, usually a knob or wheel located at one end (axle) of the sander that allows you to adjust that... run the sander at low speed while you turn it until it tracks straight

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How do I adjust the porter cable sander so that the belt runs stright?


The porter cable belt sanders have an adjustment knob (threaded screw with a black plastic t-nut on the end). The knob adjusts the angle of one of the rollers and thus the tracking of the belt. The know takes very little adjustment to change the belt's tracking.

Is the know perhaps missing? You can get replacement parts for for porter cable tools at www.servicenet.com.

Hope this helps.

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I have an Abbott & Ashby 200mm Industrial Bench Grinder - CS-8GCM I need to change the sanding belt and am unsure how to do it, can you help?


Remove/open cover on the right side of belt assembly housing. push downward on tracking knob left side top of unit.Belt is spring tensioned to remove slack.Push down remove old belt,push down again for new belt.With belt running adjust belt track(centering) by turning knob,top of unit,toward or away from you,Arrow on inside of new belt governs direction of rotation of belt.

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There should be a tracking adjustment knob on the side of the sander behind the front roller. Run the saw and adjust this knob to center the belt. You will probably have to do this every time you change belts. Hope this helps you...

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1 Answer

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The problem is that you have not set the adjustment properly. Back off the adjustment screws,slide on the belt and center it over both rollers, addust a little at a time both screws, after belt begins to tighten up stop adjusting. Turn the power switch on for about 1 second. Is the belt tracking? Adjust as necessary. Try the power again for longer and longer periods untill belt tracks in the center of the rollers. Tighten nuts to keep adjustment screws from backing out.

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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.

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Belt sander adjustment


There should be a knob on the front of the sander which adjusts the front roller on the sander. If the belt runs off in the same direction each time try turning the knob as the sander is running and while watching the belt. If turning the knob one direction does not work try turning the other direction. If turning the knob does not have any affect on the way the belt tracks on the sander then you probably have a broken or missing part on the front of the sander. This may require taking the sander to a service center.

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