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RE: Belt Issues......

Posted by PAR on December 9, 2016 at 08:39:49

In Reply to: Belt Issues...... posted by blake on December 9, 2016 at 05:46:39:

I am glad to find another Gyrodek user echoing my problem with recent drive belts. Here are two pictures ( sorry for the orienation, I have tried to rotate but they still load like this into the AA message box).

As you can see one is circular, forming an elipse when suspended from a single point. That is an old stock belt. The other picture is of a new belt and displays irremovable kinks, each one of which results in a speed fluctation when it meets the platter. Incidentally this ia after attempts to stretch and pull the belt into shape. Straight out of the pack and the result is sconsiderably worse than in this image.

The inferiority of the new belt is also measurable and very audible. The old belt providing a superb speed accuracy of 3149.8 Hz for a test tone of 3150 Hz with a deviation ( speed variation across the test period) of only 0.5% max. The new belt gives a reading of 3178.5Hz and a deviation of 1.31%. So, given that the old belt is at least 5 years old means that the old belts give a service life considerably in excess of 2-3 years ( although that may depend upon intensity of usage).

The ribbed belts recently available are the result of an attempt to improve things by altering the moulding process. They are not using a new supplier just changing things a bit with ( as far as I can tell) no positive result. "Ribbed for extra pleasure" does not appply here :-)

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