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Left hand thread nut for Pinnacle Bench Grinder

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Left hand thread nut for Pinnacle Bench Grinder

Home › Forums › Beginners questions › Left hand thread nut for Pinnacle Bench Grinder

Viewing 10 posts - 1 through 10 (of 10 total)
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  • 9 June 2017 at 15:52 #8747
    Roger Owen 5
    Participant
      @rogerowen5

      Metric or Imperial?

      9 June 2017 at 15:52 #301804
      Roger Owen 5
      Participant
        @rogerowen5

        I have a Pinnacle 6" bench grinder, bought around the early 1980's and I've lost the left hand threaded end retainer nut. Does anyone know what the thread is? Looks coarse, measures 13mm – but I wonder if it might be imperial. The thread on the shaft is 18mm long (7/10th inch) and over than length I count 9 thread ridges. Any ideas?

        9 June 2017 at 18:26 #301816
        Journeyman
        Participant
          @journeyman

          Possibly 1/2" Whit which is 12 TPI roughly 2mm crest to crest.

          John

          9 June 2017 at 22:02 #301842
          not done it yet
          Participant
            @notdoneityet

            Two wheels? If so, remove the other side and check that?

            10 June 2017 at 15:27 #301915
            Bazyle
            Participant
              @bazyle

              Measure again carefully. Likely to have been built for the American market where UNC 1/2 in has 13tpi.

              11 June 2017 at 22:17 #302138
              John Reese
              Participant
                @johnreese12848

                If the thread diameter is 1/2 inch I would bet the thread is 1/2-20. I have never seen a coarse thread on a bench grinder. No experience with bench grinders made to metric standards.

                12 June 2017 at 06:32 #302157
                not done it yet
                Participant
                  @notdoneityet

                  Just a rain check.

                   

                   

                  (7/10th inch) and over than length I count 9 thread ridges

                   

                   

                   

                   

                  How many valleys? Wondering here whether first ridge counted was number zero.

                   

                   

                   

                   

                   

                  Edited By not done it yet on 12/06/2017 06:32:44

                  13 June 2017 at 03:17 #302321
                  John Reese
                  Participant
                    @johnreese12848

                    Can you use a bolt of known pitch to check the pitch of your threads? Do you have a friend with thread pitch gauges?

                    30 June 2017 at 20:21 #304999
                    Roger Owen 5
                    Participant
                      @rogerowen5
                      Posted by Journeyman on 09/06/2017 18:26:06:

                      Possibly 1/2" Whit which is 12 TPI roughly 2mm crest to crest.

                      John

                      Hi John,

                      You could be right there. I got a gauge which only goes down to 13 TPI – it's close but I think 12 would nail it.

                      30 June 2017 at 20:25 #305000
                      Roger Owen 5
                      Participant
                        @rogerowen5

                        Thanks for all the responses. Next Question – bearings are a bit dry. Should I attempt to pack with grease, straight 30 SAE oil, heavier oil (EP90) – or does it not really matter.

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