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RE: Planer Knives Sharpening6/27
We have a Delta Rockwell 18" Planer. This planer has 3 long knives, which are approximately 18 inches long, 1 1/4 inches wide, and has a 45 degree angle on the blade.
We wanted to know if there is a blade sharpening stone that can be rubbed against the edge of the blade to sharpen it, without taking the blade off?
Also are there any blade sharpening machines out there catering to these types of long blades?
You have 3 basic options:
The knife grinders are all wet grinders, with magnetic bases, a somewhat specialized machine that few, if any woodshops would ever invest in to do their own knives. Dry grinding, with a cup stone in a drill press, can work, but risks burning the steel with heat build-up and drawing out the temper. This means the knives will not hold an edge and will need grinding much more often than if the hardness is preserved.
There are also replacement heads with small knives or chips in steel, carbide or other compounds, or Tersa heads with throwaway quick change knives.