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Freud's Shaper Cutters can be fitted with bushings to allow the use of 1 1/4" bore cutters on spindles as small as 3/4". Single cutters require the use of a pair of flange bushings in the appropriate bore in order to lock the cutter onto the spindle. Multiple cutter stacks such as stile and rail cutter sets require flange bushings as well as center cutter bushings. To determine which bushings are required, first determine the total thickness of the stacked cutter hubs, which is often equal to carbide height, and subtract the height of both flange bushings. The result is the maximum total height of center bushings required. Select bushing sizes that equal most nearly to this amount.Important: Never use center bushings that will equal or exceed the maximum total center bushing height
Freud's Standard Flange Bushings are manufactured to the highest precision to ensure a cut equal to that of the cutter without the bushing.
Be sure to clean the cutter, bushing, and spindle prior to assembly.