A friend has a DR Chipper . The blades are about 1/4 inch thick and need to be sharpened to 45degrees. Can the planner jig do this?
Yep, I do mine 3 or 4 times a year.
Keep your grader handy, chipper blades lead a hard life, and you'll have quite a bit of steel to remove. Use the coarse side of the grader aggressively every 10 minutes or so.