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Thread: Rack involute fly cutter - video

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    Jon
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    Rack involute fly cutter - video

    Rack involute fly cutter. By Clickspring. 3:12 video:


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    Supporting Member tonyfoale's Avatar
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    A rack like any other gear or pinion should have an involute shape but that shape is straight sided for a rack. So the video title is misleading. The fly cutter was sharpened to have flat sides and of course it cut flat sides on the rack.

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    Supporting Member Hans Pearson's Avatar
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    The title is misleading, but a rack does have straight teeth. The way a gear exits a rack is slightly different to the way two gears part. I unwittlingly cut a rack with an involute cutter, and I promise you, it does not work well.

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    Supporting Member tonyfoale's Avatar
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    Quote Originally Posted by Hans Pearson View Post
    The title is misleading, but a rack does have straight teeth. The way a gear exits a rack is slightly different to the way two gears part. I unwittlingly cut a rack with an involute cutter, and I promise you, it does not work well.
    A rack is just a gear with infinite radius. The same rules apply. It requires an involute shape like any gear, it is just that the involute surface is straight in this case.



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