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« on: January 12, 2014, 06:30:43 am »
As it isn't happening all the time, it could be something simple like the blade slipping in one of the clamps. I get this occasionally and the simple answer is to give the blade ends a light sanding before fitting. To check if this is the problem next time you get this knocking, stop the machine and release the tension with the white lever, if the blade has slipped there will be a large bow in the blade where it has slipped. Slacken the blade clamp and refit the blade as normal then retension with the white lever and try it again. If that was the problem then the knocking will stop. Hope this helps
Keefie.