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Milled Bevel Gears

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  • Milled Bevel Gears

    Does anyone know a good site for entering the basics data for bevel gears and getting all the Dimensions.

    I have tried the plug in in the Machinery handbook CD but, vertex distance at small end of tooth j is coming out bigger (1.25") than Vertex or apex distance J (0.6294)
    this is for 8DP, 12 tooth pinion, 44 tooth gear.

    Steve Larner

  • #2
    No. I've been thinking of writing an article, since I have cut a bunch of bevels fairly recently, but I'm not nearly done. it's a big subject, and easy to propagate bad info. I don't know of a site that is really good. Lots of "noise" via google.

    Why don't you lay it out yourself? The best bet for directly getting workable gears is to just find a gear cutter that is best fit to tooth profile about 2/3 of face back from the apex end of the tooth.

    Then set up to cut on the pitch line angle, letting the rest of the tooth go hang. You'll get a good tooth except at apex end, if you do the side shift deal to get tooth thickness right and toothspace right. You file down the apex end a little where it is too thick.
    1601 2137 5683 1002 1437

    Keep eye on ball.
    Hashim Khan

    If you look closely at a digital signal, you find out it is really analog......

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    • #3
      Kludges and compromises

      I'd agree with JT.

      Take it easy - and go back over your calculations.

      Bevel gears cut with a standard tooth cutter - or any cut on a mill - are a "kludge" and a compromise at best.

      But as JT says, with a bit of prudent use of some clear thinking, you will get a pretty satisfactory result.

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      • #4
        Try here -->> http://www.amazon.com/Gears-Gear-Cut.../dp/0852429118
        Precision takes time.

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        • #5
          "Shop (made)" bevel gears.

          Yup Ringer - that item at your link will do for "shop" gears for medium accuracy and load and speed capacities - but it will work.

          "Gears and Gear Cutting" (Ivan Law) - pages 104>111.

          Next best is the "Machinery's Handbook" which requires a fair bit of math and tables etc.

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          • #6
            Steve, PM me your email addy and I'll post some stuff on.
            Don't bother with Ivan's book if you are doing what I call proper bevels as his method is for parallel depth bevels which are a different animal, easier to do but they have to run as pairs
            .

            Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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            • #7
              This .pdf might be helpful, I scanned it out of an old book that was used for apprentices..

              http://users.beagle.com.au/lathefan/...vel%20gear.pdf
              Precision takes time.

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