A new screw thread & ION exchange resins

Advert

A new screw thread & ION exchange resins

Home Forums The Tea Room A new screw thread & ION exchange resins

Viewing 10 posts - 1 through 10 (of 10 total)
  • Author
    Posts
  • #389169
    martin perman 1
    Participant
      @martinperman1

      After reading the post "measurements of the past" I started reading a copy of Practical Mechanics July 1949, one of a few I picked up last October, and found two interesting pieces written by the editor under FAIR COMMENT.

      The first piece is regarding "the new screw thread" this is the adoption of the new "Unified" thread form which had been ratified by the signing of the Declaration of Accord. The British Standards Institution issued a provisional specification of the thread series for use by industry.

      The new thread came about because of interchangability between English and American threads during the last war.

      Investigations of the new thread were carried out by the N.P.L engineering division mainly concernining its strength and it was found to be stronger than the Whitworth series. Tests were also made between the interchangeability of the two threads which showed no loss of strength between crossing parts between the two threads.

      The other piece was the discovery,1934, of ION exchange resins by Holmes and Adams one class of these is synthetic resins which when ordinary tap water was passed through them the water quality changed in purity similar to distilled water and sea water when passed through them became drinkable.

      This lead to the use of water softening use in the home and industry.

      Martin P

      Advert
      #35368
      martin perman 1
      Participant
        @martinperman1
        #389173
        ega
        Participant
          @ega

          Interesting.

          Does this mean that, say, a 5/16" UNC screw in a 5/16" BSW hole will be as strong (or stronger) than a like for like pairing?

          Judging by the impressive security fence outside the NPL, they must be doing some important work.

          #389177
          Michael Gilligan
          Participant
            @michaelgilligan61133
            Posted by ega on 03/01/2019 17:20:01:

            Interesting.

            Does this mean that, say, a 5/16" UNC screw in a 5/16" BSW hole will be as strong (or stronger) than a like for like pairing?

            .

            I would like to see the actual report … The editorial summary on interchangeability reads like utter tosh:

            [quote]

            Tests were also made between the interchangeability of the two threads which showed no loss of strength between crossing parts between the two threads.

            [/quote]

            MichaelG.

            .

            Edit: I've just searched, and found this:

            https://apps.dtic.mil/dtic/tr/fulltext/u2/a280223.pdf

            Not had chance to read it properly, but: There are only four occurrences of the word 'Whitworth' and they are associated with the word 'truncated'

            I rest my case.

            Edited By Michael Gilligan on 03/01/2019 18:00:14

            #389195
            Michael Gilligan
            Participant
              @michaelgilligan61133

              Incidentally [and hoping that Martin has no objection] … here is a very neat single page summary of 'the more common standard series' threads, in our sort of sizes: **LINK**

              http://www.kayelaby.npl.co.uk/miscellaneous_engineering_data/5_1/5_1.html

              MichaelG.

              #389197
              martin perman 1
              Participant
                @martinperman1

                No problem, I'm only pleased I writ what I red smiley

                Martin P

                #389199
                Michael Gilligan
                Participant
                  @michaelgilligan61133

                  yes

                  #389214
                  Anonymous

                    The idea behind the unified thread form was that it rationalised the US/Canadian threads and in the UK would replace Whitworth threads. Of course it didn't quite work out, but it was a sensible idea given the volume of armaments imported from the US during WWII.

                    Andrew

                    #389218
                    martin perman 1
                    Participant
                      @martinperman1
                      Posted by Andrew Johnston on 03/01/2019 21:15:26:

                      The idea behind the unified thread form was that it rationalised the US/Canadian threads and in the UK would replace Whitworth threads. Of course it didn't quite work out, but it was a sensible idea given the volume of armaments imported from the US during WWII.

                      Andrew

                      Surely that worked, not. Wasnt there a colaboration between us and them where we built a part in metric and they in english and nobody could understand why they wouldnt fit together.

                      Martin P

                      #389244
                      not done it yet
                      Participant
                        @notdoneityet
                        Posted by martin perman on 03/01/2019 21:23:44

                        Surely that worked, not. Wasnt there a colaboration between us and them where we built a part in metric and they in english and nobody could understand why they wouldnt fit together.

                        Martin P

                        Nah! Likely we made Whitworth and they made UNC, but most threads were 1/2” in diameter!smiley

                      Viewing 10 posts - 1 through 10 (of 10 total)
                      • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

                      Advert

                      Latest Replies

                      Home Forums The Tea Room Topics

                      Viewing 25 topics - 1 through 25 (of 25 total)
                      Viewing 25 topics - 1 through 25 (of 25 total)

                      View full reply list.

                      Advert

                      Newsletter Sign-up