Myford Super 7 Tailstock Micrometer Dial

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Myford Super 7 Tailstock Micrometer Dial

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Viewing 25 posts - 1 through 25 (of 34 total)
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  • #372857
    Graham Meek
    Participant
      @grahammeek88282

      I was recently approached by a member of the Forum as regards had I done anything with the Tailstock dial on the Super 7. My initial answer was no, and that I did not foresee any prospect of doing such in the future. Not owning a Super 7 now would make the task harder.

      George Thomas did an elegant solution to this problem some years back. A Tailstock Micrometer, chapter 14, page 160 of the first edition, "The Model Engineers Workshop Manual". While 0.300" per rev is fine for the Imperial user, although a little awkward as regards the tailstock barrel graduations, 1/8 th's. It was not so good when it came to a lathe with Metric units.

      As is usual when a seed has been sown, an idea germinates. The initial problem with involving gearing in this dial is the need to keep the Dial small so as not to obstruct the handwheel in use. Normal reduction gearing would lead to an extra large dial.

      The Eureka moment came when I was thinking about another problem. Speeding up the initial gear train then reducing it leads to a more compact Dial. Due to the reduction in bearing area on the face of the handwheel boss a needle roller thrust race has been added to make ejecting centres, arbors, etc easier. This is a worthwhile mod without the dial. An oilite bush has also been added to reduce the need to lubricate the bearing after assembly. An annual top-up should be more than adequate.

      The metric dial is graduated 0-10 mm per revolution but has an inbuilt error of reading plus on the 10 mm dimension by 0.000127 mm. Over the entire barrel travel this would be nothing to worry about. The imperial version is graduated 0-0.500" and has no error, that is always assuming a theoretical pitch of 0.300" to start with.

      Plans are however in hand to produce an article on these dials. Whether one of the ME suppliers takes up the manufacture of these dials then it is early days. For my part I want no part in this side of things.

      Regards

      Gray,

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      #19086
      Graham Meek
      Participant
        @grahammeek88282
        #372863
        Michael Gilligan
        Participant
          @michaelgilligan61133

          Nice one, Gray yes

          MichaelG.

          #372864
          Mike Crossfield
          Participant
            @mikecrossfield92481

            Gray,

            What a neat solution. I built your Super 7 carriage handwheel a couple of years back and find it invaluable. I look forward to seeing construction details for the tailstock dial in due course. Where will the article be published? ME, MEW, or elsewhere?

            Mike

            #372870
            Brian Oldford
            Participant
              @brianoldford70365

              Want one.

              #372898
              Graham Meek
              Participant
                @grahammeek88282

                Michael and Mike,

                Thanks for the compliments

                As regards publication, I am a long way off from that at the moment. I never write about anything unless I have made the item myself and currently I am wading through the parts drawings. Plus I could do to source a donor Tailstock from somewhere to help with the photographs, it will all take time.

                Regards

                Gray,

                #372927
                Brian Oldford
                Participant
                  @brianoldford70365

                  Do you have any plans to fit it with a "resettable" feature?

                  #372943
                  Graham Meek
                  Participant
                    @grahammeek88282

                    Hello Brian,

                    I am sorry I omitted to say that the Dial will be able to be set to Zero at any point. The friction device has been proven over many years on my Myford series 7 Handwheel Dial design for the Carriage, or Apron handwheel. This is incorporated with the sleeve gear that rotates on the Tailstock Handwheel boss. The Handwheel boss needs to be machined by the way to 24 mm diameter. This is somewhat smaller than in the George Thomas design, hence why I used the needle roller thrust race.

                    Regards

                    Gray,

                    #373021
                    Hillclimber
                    Participant
                      @hillclimber
                      Posted by Graham Meek on 23/09/2018 13:08:46:

                      Plans are however in hand to produce an article on these dials. Whether one of the ME suppliers takes up the manufacture of these dials then it is early days. For my part I want no part in this side of things.

                      So, is this one for 'Steamer'? I have one of his excellently-produced versions of your saddle dial on my S7.

                      #373026
                      Steamer1915
                      Participant
                        @steamer1915

                        Perhaps…wink

                        #373239
                        Brian Oldford
                        Participant
                          @brianoldford70365
                          Posted by Hillclimber on 24/09/2018 09:31:55:

                          So, is this one for 'Steamer'? I have one of his excellently-produced versions of your saddle dial on my S7.

                          Me too. I bought another when I traded up from a Mk1 to a Mk2 S7.

                          #373500
                          Graham Meek
                          Participant
                            @grahammeek88282

                            There appears to be two types of Tailstock fitted to the Super 7. A Mk 1 and Mk 2, can anyone shed some light on the differences between these Mk's? I would hate to restrict the design to fit only one type.

                            Regards

                            Gray,

                            #375390
                            Graham Meek
                            Participant
                              @grahammeek88282

                              myford s7 tailstock micrometer dial prototypes 2.jpg

                              myford s7 tailstock micrometer dial 3d.jpg

                              myford s7 tailstock micrometer dial 3d components.jpg

                              Just thought I would update the forum on the progress of the Prototypes. I have been lucky in that John Slater has produced some lovely 3D images of the Dial conversion. I could not have done this project without his help, KWIL's, and that of Michael M who initially asked if I had done anything about the S7 Tailstock Dial. Which in turn started me thinking about the problem and this attachment.

                              I have also been told from several sources that the difference between the tailstock Mk's is all down to the position of the Barrel Locking Lever. Horizontal means it is a MK1 and vertical being a MK2.

                              Regards

                              Gray,

                              #377817
                              Graham Meek
                              Participant
                                @grahammeek88282

                                For those following the progress on this attachment. This week I have managed to cut all the gears for both versions of the dial. Today the dials were graduated, there are still 4 operations to complete them

                                The Imperial dial is shown after 5 turns and shows Zero, Although the photograph does not do it justice. The screw driver slot and the slit in the brass sleeve gear are in-line as they were before I started.

                                The Metric dial reads,30.50 after 4 complete turns, it should read 30.48, and it should read plus anyway because of the gear train.

                                imperial dial train after 5 complete turns.jpg

                                metric dial train 30.50.jpg

                                test rig to test gear centres.jpg

                                Regards

                                Gray

                                #377833
                                Mike Crossfield
                                Participant
                                  @mikecrossfield92481

                                  Nice work Gray. I’m really looking forward to seeing the plans for this is print so that I can make my own copy.

                                  Mike

                                  #377875
                                  Graham Meek
                                  Participant
                                    @grahammeek88282

                                    Hello Mike,

                                    Thanks for the kind words, the article is well underway but a photograph from one of my collaborators is needed to show the dial assembled before I can finish this off.

                                    Regards

                                    Gray,

                                    #378101
                                    Graham Meek
                                    Participant
                                      @grahammeek88282

                                      The dial are now finished and ready to fit to the tailstock, hope you like them. I shall have to wait for a final assembly photograph, but no doubt they will come.

                                      Regards

                                      Gray

                                      imperial dial ready to fit.jpg

                                      metric dial ready to fit.jpg

                                      #378132
                                      duncan webster 1
                                      Participant
                                        @duncanwebster1

                                        I've just checked the tailstock travel on my Myford 254 (metric version) and find it is 0.3" per rev, so I'm waiting with bated breath. Is it going to be in EIM or MEW?

                                        #378145
                                        Graham Meek
                                        Participant
                                          @grahammeek88282

                                          Hi Duncan,

                                          At the moment I cannot say which it will be, sorry. The 254 uses the same set-up as the S7 as regards feedscrew, but I cannot remember if the bearing piece screwed into the tailstock body the same. Or whether there was a spigot attached with capscrews. I suspect it could be adapted.

                                          Gray,

                                          #378186
                                          duncan webster 1
                                          Participant
                                            @duncanwebster1

                                            It appears to be screwed in, on the parts list there is a reference to part # 11855, the S7 parts list refers to A2114 but they could be the same or very similar. No dobt I'll be able to improvise, or I could take the easy option of 300 divisions (thous) and a calculator!

                                            Edited By duncan webster on 29/10/2018 09:26:42

                                            #378372
                                            Graham Meek
                                            Participant
                                              @grahammeek88282

                                              Duncan I have sent you a PM

                                              Regards

                                              Gray,

                                              #379399
                                              Graham Meek
                                              Participant
                                                @grahammeek88282

                                                Thanks to Steve I am able to share with you a photograph of the Metric dial assembled onto the Tailstock. Looks as though it has always been there.

                                                Regards

                                                Gray,

                                                metric dial courtesy steve-1.jpg

                                                #379402
                                                Mike Crossfield
                                                Participant
                                                  @mikecrossfield92481

                                                  Gray

                                                  Just a small aesthetic point. Was there a good reason for not matching the reduced diameter of the base to the diameter of the tailstock casting?

                                                  Mike

                                                  #379403
                                                  Brian Oldford
                                                  Participant
                                                    @brianoldford70365
                                                    Posted by Graham Meek on 06/11/2018 10:15:37:

                                                    . . . . . . . Looks as though it has always been there. . . . ..

                                                    A perfect complement to the saddle handwheel.

                                                     
                                                    #379410
                                                    Graham Meek
                                                    Participant
                                                      @grahammeek88282
                                                      Posted by Mike Crossfield on 06/11/2018 10:28:19:

                                                      Gray

                                                      Just a small aesthetic point. Was there a good reason for not matching the reduced diameter of the base to the diameter of the tailstock casting?

                                                      Mike

                                                      Hi Mike,

                                                      I and my helpers have deliberated over this very point. One problem which exists is the eccentricity of the tailstock casting. On some tailstock bodies the eccentricity is very pronounce and this would show up even more if the abutment face was larger in diameter. Trying to match the two would be impossible and would always leave a step somewhere around the diameter. To make the backplate just a plain diameter would I feel detract from the current set-up and make the assembly look bulky. Of course there is no reason why anyone making the attachment cannot add their own flair in this region.

                                                      Nothing is carved in stone with my designs.

                                                      Another point in favour of the reduced diameter comes when fitting this attachment to the 254 lathe. It appears from the photographs I have seen that Myford have "spot faced" the tailstock in this region to take the same part as is fitted to the S7, so a larger diameter here would be a problem.

                                                      This then was some of the rational behind why I have done what I have.

                                                      Regards

                                                      Gray,

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