Put a shoulder or spacer on it tall enough that the disk wheel can reach the entire tooth while clearing the grinder table top. Arrange a short vertical arbor on your grinder table for your cutter to rotate on. I'm going to assume you will use a thin disk wheel on a grinder to reach between the cutter teeth. Unfortunately, the OEM's usually stamp the original rake angle on the cutters, when what the resharpener needs is the base circle diameter!Ĭincinnati had a fairly simple fixture for grinding form cutters which could be approximated in your shop without too much trouble. If the cutting faces were not radial, because the OEM wanted some rake on the teeth, then you need to figure out the base circle the faces are tangent to, and resharpen the faces so they stay tangent to that circle. That second condition is normally met by indexing off the back of the teeth. If the cutting faces were radial (perpendicular to the bore), they need to stay radial, so you are grinding off a narrow wedge, wide at the circumference tapering to zero at the bore axis and you need to grind the same amount off each tooth. The key point in Larry's post is that form cutters, like involute gear cutters, are not sharpened the same way as most milling cutters.
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