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Involute cutter

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Involute cutter

Home › Forums › Beginners questions › Involute cutter

Viewing 7 posts - 1 through 7 (of 7 total)
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  • 20 July 2023 at 17:39 #11531
    Peter Simpson 3
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      @petersimpson3
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      20 July 2023 at 17:39 #653015
      Peter Simpson 3
      Participant
        @petersimpson3

        I have been asked to produce some small gear wheels.

        The dimension of the sample is as follows.

        Diameter across the teeth…….0.467"

        Approx PCD…………………..0.400"

        Number of teeth ……………14.

        Using my limited knowledge of gear cutting. I work out the cutter would be

        36 DP number 7 cutter to be the cutter required. Could anybody confirm my calculations ?

        20 July 2023 at 18:03 #653018
        Pete Rimmer
        Participant
          @peterimmer30576

          Hi Peter,

          The figures could indeed indicate a 36DP gear. They do not align exactly with the traditional calculation of (n+2)/OD nor to the long-addendum adjustment factor od OD x 1.122 for hobbing a 14 tooth 36DP gear.

          Do you have access to the same measurement figures for the mating gear?

          EDIT: actually a 14 tooth gear of .400" PCD works out exactly 35DP.

           

          Edited By Pete Rimmer on 20/07/2023 18:16:42

          20 July 2023 at 18:29 #653020
          Peter Simpson 3
          Participant
            @petersimpson3

            I only have the single gear to work with. I cannot see any 35DP cutters so I will give the 36DP number 7 a try.

            20 July 2023 at 18:34 #653021
            Pete Rimmer
            Participant
              @peterimmer30576

              I have a 35DP hob in 20PA

              OD for 35DP 14 tooth is 0.467" (non-modified addendum) only 10 thou smaller your measurement. 36DP is 0.444, 23 thou smaller.

              20 July 2023 at 18:50 #653023
              JasonB
              Moderator
                @jasonb

                It's not far off 0.75MOD

                20 July 2023 at 18:53 #653024
                DC31k
                Participant
                  @dc31k
                  Posted by Peter Simpson 3 on 20/07/2023 18:29:07:

                  I only have the single gear to work with.

                  Do you have any information on what the gear meshes with? Even if it is two identical ones meshing, the shaft centres will help confirm the PCD.

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