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11th January 2013, 12:03 AM #1
... and this too shall pass away ...
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What the $%*# is happening to my vertical sander?
I have a Big Boy vertical/horizontal sander, and use it a lot.
Today I noticed it seemed to be struggling, as if it was trying to overcome a huge load even when it was not sanding. This got worse as the day went on.
I noticed the belt was sitting at a bit of an angle horizontally, so I replaced it with a new belt. Problem solved, she spun up to speed freely, even though the belt was still not quite horizontal.
Perplexed, I replaced the old belt, and once again the machine struggled as if under a huge load, so badly it seemed that it should have tripped the circuit breaker.
Put the new belt back on, and again she spun up to speed freely.
So, the machine is working well again, but I am at a loss to understand what it is about the old belt that caused the problem in the first place. Has anybody else had a similar issue; can anyone explain what is happening?
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11th January 2013, 11:02 PM #2
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Photos?
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12th January 2013, 07:54 PM #3
... and this too shall pass away ...
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This is the offending machine.
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12th January 2013, 09:51 PM #4
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How long are the belts, and what belt is on it in that picture?
Cheers,
Paul
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13th January 2013, 10:06 AM #5
The Laird
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Is the old belt noticably stiffer than the new one? I thought the glue or resin or whatever is in the belt may have hardened and is difficult for the motor to force around the spindles.
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13th January 2013, 10:12 AM #6
Senior Member
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Belt stiffness is a good thought.
I was also wondering about the back surface of the belts, and if the bad one was higher friction, dragging on the plate and slowing the motor.
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13th January 2013, 12:10 PM #7
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When the old belts harden they tend to break at the joints just under the standard tensioner load.
Are the two belts identical in size, and grit? Maybe the old belt rubs somewhere?
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14th January 2013, 02:37 AM #8
... and this too shall pass away ...
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Thanks everyone.
The machine is over ten years old. I have used everything from 40 to 120 grit on it without a problem, until recently.
The belt in the pic is the one I've had trouble with (100 grit). I can see nothing about the old belt that makes it any different from the many others removed.
The belt was tracking OK, so shape is not likely an issue. It was not hard or sticky.
I will keep this belt and compare it with those I remove in future, but am beginning to wonder if I'll ever know what the issue was.
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