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Birch Plywood surface Wavy Lines reflection with a defective belt Sander

We have seen a lot of  sanding Wavy reflection these days during the inspection of full birch plywood .The main reason is the  defective belt or a damaged belt (staple in Plywood) can give a slightly raised wavy line, (area with abrasive removed from belt by staple) and will usually follow with the belt when it’s reversed.  Rippling in a Plywood is called chatter if the ripples are less than 1 1/2 inches apart, and waves if the ripples are more than 1 …

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