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I recently purchased new a Tormek SuperGrind 1200 and when I set the grind angle with the anglemaster for a chisel or plane blade it cuts it about 5 degrees out.  So I set it for 30 degrees and when I checked the cut blade it is at 35 degrees.  I've check the stone diameter and it is 200 mls and I've set the anglemaster to this.  I do get the right degree cut when I set the anglemaster to a 175 ml diameter stone.  This doesn't make sense to me and I was wondering if others have had this problem and if the angle master is faulty - not sure how, as it is a simple device.