Diametric Pitch

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Diametric Pitch

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  • #303198
    Bazyle
    Participant
      @bazyle

      Put "Diametric Pitch" into Google (without the inverted commas ) and it insists on giving me "Diametral Pitch" and it seems Wikipedia only wants that word too. Am I having a senior moment? Using the restricted search on the home page for this forum agrees with me as does the forum spellchecker.
      Did it get metricised or something? Was there an ISO naming standard I missed?

      If I force it I can get some results but I just don't recall coming across this before and have a reasonable vocab. As an aside I casually used the word "alacrity" in a meeting recently and nobody else knew what it meantfrown

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      #25313
      Bazyle
      Participant
        @bazyle

        Where’s it gone?

        #303202
        SillyOldDuffer
        Moderator
          @sillyoldduffer
          Posted by Bazyle on 19/06/2017 15:31:27:

          Put "Diametric Pitch" into Google (without the inverted commas ) and it insists on giving me "Diametral Pitch" and it seems Wikipedia only wants that word too. Am I having a senior moment?

          You're in very good company if it's a senior moment.

          The bad news is that none of my books support 'Diametric Pitch'. As far as I can tell it's been diametral at least since 1939. Time for you to go metric perhaps, there's no such confusion with 'module'.

          Dave

          #303211
          richardandtracy
          Participant
            @richardandtracy

            I have BS 436: Part 1:1967 on my desk at the moment. It's 'Specification for Spur and Helical Gears… (diametral pitch series)'

            So I can confirm it's been 'diametral' since at least 1967…

            Regards,

            Richard

            #303221
            Mark Rand
            Participant
              @markrand96270

              Sod that, I'm not going metric. I'll go metral instead devil

              Edited By Mark Rand on 19/06/2017 16:17:55

              #303224
              Jeff Dayman
              Participant
                @jeffdayman43397

                Metral, eh Mark Rand?

                Would you use millmetrals to measure diametric pitch then? Or gunits?

                Just joking.

                When talking Imperial size gear teeth sizes, diametral pitch is the term used, not diametric, in North America.

                When talking metric gear teeth sizes, module is used in North America. JD

                #303227
                Michael Gilligan
                Participant
                  @michaelgilligan61133
                  Posted by Bazyle on 19/06/2017 15:31:27:

                  Put "Diametric Pitch" into Google (without the inverted commas ) and it insists on giving me "Diametral Pitch"

                  .

                  With or without the inverted commas, and with or without capitalisation

                  … what you seek is only a click away:

                  .

                  img_1146.jpg

                  .

                  MichaelG.

                  Edited By Michael Gilligan on 19/06/2017 16:37:35

                  #303237
                  Bazyle
                  Participant
                    @bazyle

                    Well at least that comes up with plenty of hits too so it is in common usage. Also a link to " diametrical " pitch which is also in the forum spell checker whereas diametral gets red lined.
                    I put diametral into the forum specific search and get 68 hits but diametric gets 127 so I think I must have picked up the term from reading Model Engineer as that anyway is how I learned 90% of my useful knowledge.

                    I wonder what else I'm out of step with. Perhaps I should start using 'laith' like some on ebay do.

                    #303241
                    SillyOldDuffer
                    Moderator
                      @sillyoldduffer
                      Posted by Mark Rand on 19/06/2017 16:17:30:

                      Sod that, I'm not going metric. I'll go metral instead devil

                      Edited By Mark Rand on 19/06/2017 16:17:55

                      We metric zealots must be wiseacres…

                      #303245
                      duncan webster 1
                      Participant
                        @duncanwebster1

                        Diametral or Diametric. Does it matter? We know what you mean. Some people need to get out more

                        #303246
                        John Stevenson 1
                        Participant
                          @johnstevenson1

                          Bazyle you only get 127 hits because its the prime of 25.4 which is modular.

                          Sorry I’ll get me coat

                          #303251
                          Tim Stevens
                          Participant
                            @timstevens64731

                            Using the word alacrity is nugatory.

                            Tim

                            #303270
                            Michael Gilligan
                            Participant
                              @michaelgilligan61133

                              It's a subtle distinction, Bazyle … but I believe that:

                              • Diametral means 'based upon' or 'relating to' the diameter … whereas
                              • Diametric means 'across' the diameter [in the sense of things that are diametrically opposite]

                              MichaelG.

                              #303271
                              Michael Gilligan
                              Participant
                                @michaelgilligan61133
                                Posted by SillyOldDuffer on 19/06/2017 17:34:16:

                                We metric zealots must be wiseacres…

                                .

                                Hectarious, Dave laugh

                                MichaelG.

                                #303283
                                Enough!
                                Participant
                                  @enough
                                  Posted by Michael Gilligan on 19/06/2017 20:41:41:

                                  It's a subtle distinction, Bazyle … but I believe that:

                                  • Diametral means 'based upon' or 'relating to' the diameter … whereas
                                  • Diametric means 'across' the diameter [in the sense of things that are diametrically opposite]

                                   

                                  Then there's "diametrical" according to my OED …. but not "diametralic".

                                  surprise

                                  Edited By Bandersnatch on 20/06/2017 01:35:47

                                  #303284
                                  Hopper
                                  Participant
                                    @hopper

                                    Diametral would seem to fit with circumfrential, radial, axial and so forth.

                                    But both the -ic and and -al suffixes mean "relating to" so six of one and half a dozen of the other really. (Or five of one and 0.5 of a metric dozen of the other if you are that way inclined.)

                                    #303286
                                    Michael Gilligan
                                    Participant
                                      @michaelgilligan61133
                                      Posted by Bandersnatch on 20/06/2017 01:33:43:

                                      Posted by Michael Gilligan on 19/06/2017 20:41:41:

                                      • Diametric means 'across' the diameter [in the sense of things that are diametrically opposite]

                                      Then there's "diametrical" according to my OED …. but not "diametralic".

                                      .

                                      wink

                                      #303289
                                      Michael Gilligan
                                      Participant
                                        @michaelgilligan61133

                                        Hopper,

                                        I've just found this: **LINK**

                                        http://wikidiff.com/diametral/diametric

                                        … which I think you will appreciate.

                                        After trying [as did I] to describe the distiction, they then list synonyms dont know

                                        MichaelG.

                                        #303302
                                        Mike E.
                                        Participant
                                          @mikee-85511
                                          Posted by richardandtracy on 19/06/2017 16:03:22:

                                          I have BS 436: Part 1:1967 on my desk at the moment. It's 'Specification for Spur and Helical Gears… (diametral pitch series)'

                                          So I can confirm it's been 'diametral' since at least 1967…

                                          Regards,

                                          Richard

                                          Since at least 1955, according to my earliest Machinery's Handbook.

                                          #303385
                                          Neil A
                                          Participant
                                            @neila

                                            Diametral Pitch was used in BS 436: 1940 Machine Cut Gears.

                                            I also have a copy of Machine Cut Gears from David Brown dated 1921 which refers to Diametral Pitch. The introduction in the book says that it is a reprint of their 1903 book.

                                            I have nothing earlier, but the term seems to have been in use for a long time.

                                            But I agree with Duncan, we all know what you mean, most of the time we just use the symbol DP and not worry what it stands for.

                                            Neil

                                            Edited By Neil A on 20/06/2017 14:06:43

                                            #303388
                                            Enough!
                                            Participant
                                              @enough
                                              Posted by Mike E. on 20/06/2017 08:57:57:

                                              Since at least 1955, according to my earliest Machinery's Handbook.

                                              And "diametral" according to my 1914 replica Machinery's Handbook … any higher bids?

                                              Oh, I see Neil A snuck in with a 1903

                                              smiley

                                              #303407
                                              John Stevenson 1
                                              Participant
                                                @johnstevenson1

                                                Cammus.
                                                A treatise on the teeth of gears 1806

                                                Diametrical

                                                #303423
                                                mark costello 1
                                                Participant
                                                  @markcostello1

                                                  Well, there is one problem Imferial does not have.

                                                  #303432
                                                  SillyOldDuffer
                                                  Moderator
                                                    @sillyoldduffer
                                                    Posted by John Stevenson on 20/06/2017 16:02:32:
                                                    Cammus.
                                                    A treatise on the teeth of gears 1806

                                                    Diametrical

                                                    Point of Order Mr Chairman. Charles-Étienne-Louis Camus was a Napoleonic Frenchman. Of course he thought it was metric.

                                                    Je vais chercher mon manteausmiley

                                                    #303503
                                                    duncan webster 1
                                                    Participant
                                                      @duncanwebster1

                                                      Socrates thought it was Dialectic

                                                      I'll take the dog out now!

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