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Thread: tension
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18th April 2015, 06:34 PM #1
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tension
I have a 14 inch Powermatic brand bandsaw, recently i found that when I tried to tension the blade by turning the blade tension knob, the slide bracket would not move, all that appeared to happen was the spring in the slide bracket would compress, as a result of this I believe that the thread on the blade tension knob has become cross threaded, it will still wind up and down, but with some angst.
When the blade is not attached the slide bracket will move in the groove well and there does not appear to be anything causing the bracket to bind.
When the blade is on and I tension it with the tension lever the blade is taut by not taut enough.
I have looked and looked and still can not see why the slide bracket does not move up when the blade tension knob is turned. could it be because the thread is not running smoothly or is there something simple that I am missing.
I have attached a few pics that might assist
Regards
Grahamwhale oil beef hooked
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5th July 2015, 12:23 AM #2
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If the spring is compressing everything should be fine. As the spring continues to compress, there is a square nut which should become visible in the window. As the nut rides further up the window, greater tension is applied to the band. If you are running a 1/2" band, turn until the nut is at the 3/8" mark. Your manual should tell you if it is the top of the nut or bottom. The gauge is not really accurate, but provides a consistent reference point.
Don
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6th July 2015, 09:46 AM #3
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Hooke's law the spring compression is proportional to force (tension).
Originally Posted by Don Burch
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6th July 2015, 10:45 AM #4
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tension
And? Originally Posted by Yanis
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6th July 2015, 01:46 PM #5
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tension
I also can just see the edge of the square nut that travels up the threaded rod as you increase the tension. This nut has to be up around the mark for your size(width) of band.
The spring is made to compress, the band is not made to stretch. You will never get the blade absolutely taught without causing serious stress on the blade. Some band manufacturers say 15,000 psi is the right amount. Most of the commercial low tension silicon bands work well following the gauge on the saw, even a bit less.
Depending on the age and use or possible poor quality from the factory, your spring might be tired. There are many aftermarket sources for a replacement spring.
Don
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6th July 2015, 03:57 PM #6
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The tension increases as the spring compresses. Double the compression double the tension. (Sorry I though that was self evident.) Originally Posted by Don Burch
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6th July 2015, 06:27 PM #7
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I my have missed somthing here, have you tried lubrication
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