Slide projector drive help?

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Slide projector drive help?

Home Forums The Tea Room Slide projector drive help?

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  • #478926
    Ian Parkin
    Participant
      @ianparkin39383

      I have an old Rollei p11 dual format projector that the drive to the slide changer is a bit weak.

      the fan which is running continuously has a solonoid operated idler wheel which makes contact when drive is called for

      Ive cleaned the idler with MEK (Rubber rejuvenater) but it slips when needed

      would you rough up the shaft?

      if so what with…wet and dry,emery etc

      c9d5b622-b6f0-431b-85eb-ccc5f595266e.jpeg

      Its the spindle sticking out from the blue rotor

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      #35944
      Ian Parkin
      Participant
        @ianparkin39383
        #478931
        John Haine
        Participant
          @johnhaine32865

          It would need to be quite coarse so emery paper, rubbed longitudinally so the "teeth" are at right-angles to the idler. Ideally a new idler I think – possibly using an O ring as a tyre on an aluminium hub?

          #478932
          Martin Connelly
          Participant
            @martinconnelly55370

            I think I would try a rubber sleeve on the shaft first. It is a reversible option if it does not work.

            Martin C

            #478949
            Michael Gilligan
            Participant
              @michaelgilligan61133
              Posted by Martin Connelly on 10/06/2020 16:06:54:

              I think I would try a rubber sleeve on the shaft first. It is a reversible option if it does not work.

              .

              Me too yes

              Hellermann sleeve should be good.

              https://www.canford.co.uk/ProductResources/resources/H/Hellerman/Hellermann%20Sleeves%20Datasheet.pdf

              MichaelG.

              Edited By Michael Gilligan on 10/06/2020 17:49:43

              #478954
              Ed Duffner
              Participant
                @edduffner79357

                IMHO, rather than modifying what you already have, I would try cleaning the shaft first with IPA or methylated spirit to remove any build-up of lubricant or contamination . But I would not try this on the rubber idler as the rubber may expand and loosen when exposed to a spirit based fluid.

                Ed.

                #478956
                Howard Lewis
                Participant
                  @howardlewis46836

                  As a last resort, would heat shrink sleeving provide sufficient grip?

                  Again, a reversible / replaceable means

                  Howard

                  #479114
                  Ian Parkin
                  Participant
                    @ianparkin39383

                    Well after pulling out the drive wheel i had a closer look at it …it was very hard no compression at all with fingers or teeth!!

                    is this material called ebonite?

                    anyway gently rubbed the surface up with 300g emery cloth then again with the MEK

                    cleaned the shaft as best i could though the drive wheel touches only 5mm from where the spindle exits a oillite bush in the motor and it seemed a lot better…but still could be snappier in operation.

                    if i helped the solonoid it worked perfectly

                    checking the voltage to the solonoid it was only 15v dc but if the reverse was used another solonoid pulls in then the voltage drops to 10 v ish

                    delving into the wiring the motor and lamp are 240v the transformer for the control circuit and focus motor is built into the motor windings…not seen this sort of arrangement before.

                    the low voltage ac is fed to an old selenienium rectifier then onto the control circuits so i added a 100uf cap on the dc side and now everything works well

                    cleaned up all the casings which looked rough when i got it off eBay but its cleaned up great and now works fine on the 2×2 side …just waiting for magazines for the 7×7 side.

                    2d45abdf-73aa-43c0-8dd7-8b67d3d49981.jpeg

                    64713e36-a89f-42bc-b8a2-cac352f73891.jpeg

                    #479122
                    John Haine
                    Participant
                      @johnhaine32865

                      Selenium rectifier! Good grief! They don't last forever. Replacing it with a modern silicon diode type would probably fix the problem without the cap.

                      #479131
                      Nick Clarke 3
                      Participant
                        @nickclarke3
                        Posted by Ian Parkin on 10/06/2020 15:28:16:

                        I have an old Rollei p11 dual format projector that the drive to the slide changer is a bit weak.

                        Deeply envious – I lusted after one of those for as long as I shot transparency film!

                        #479136
                        Ian Parkin
                        Participant
                          @ianparkin39383

                          Nick

                          theres lots on ebay

                          i bought this one for £60 posted…..it came from Ding dong !!!!

                          not heard of that place

                          I wanted one for years in the 80sand 90s but they were too rich for me

                          i also recently bought a rollei twin lens dissolve all in one unit with zoom lenses for less than a 100

                          Edited By Ian Parkin on 11/06/2020 16:24:58

                          #479141
                          Nick Clarke 3
                          Participant
                            @nickclarke3

                            Unfortunately I haven't shot transparency film in years. I still do some b&w (That always sounds like the anti-drug advert, "I do some film, but I can handle it" ) and some c41 for convenience.

                            I think the last Fujichrome I shot was 5×4 – I bought 10 sheets just to try and to be able to say I had shot large format reversal, but they havn't moved out of the file since I shot them.

                            Digital is far better in almost every way except occasionally I remember the fun that film was.

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