Sharpening Info – Plastic Granulator Blades

Plastic Granulator Blades have 2 components, the fly blade and the base blade.  We typically get asked to sharpen the fly blades more than the base blades.  The Fly blades look extremely similar to double sided Wood Chipper Blades, our illustration will use the same image.

We have encountered Plastic Granulator blades that have 2 different bevel angles ground into them. The top bevel is usually 30 or 35 degrees and the bottom bevel is usually some different angle. Because we have to setup the machine differently to grind that bottom bevel it is like grinding another complete edge and will be charged as another edge. A double edged Granualtor blade that has a bottom angle ground into it now is like grinding 2 different edges on each side of the double sided blade.  So this is like grinding 4 edges.  Every inch of edge (top+bottom on both sides of the blade) costs 4 X the per inch cost.  These are very expensive blades to grind.

We are aware that many flat blades have constraints such as a “Minimum Blade Height” (the name may vary, but the measurement is from the back of the blade for single edged blades to the edge or from the center line of the blade to the edge for double edged blades) that we need to take into account. We will ask if your machine has such constraints before we accept the blade for sharpening so we will not waste your money sharpening a blade that will be below the Minimum Blade Height.