jointer blade sharpening problem

[Marty]

  Is there a design flaw with the blade holder jig for sharpening jointer blades ?  I am trying to sharpen 5/8 inch wide blades (supposed to be able to sharpen minimum 1/2 inch width blades ) at a 30 degree angle,  and when I try to sharpen, the blade holder scrapes on the grinding wheel before the edge is sharpened even close.  My grinding wheel is not that old, only worn down about 3/8 inch from original diam.

[Jeff Farris]

Are you sure that 30 degrees is the proper angle for your jointer blades?  That seems very thin.  Most are no less than 40 degrees.  Blades only 5/8" tall at an angle of 30 degrees would be very abnormal, and I would not be surprised at the interference your experiencing.