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OT - Mechanical Drawing Device Identification

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  • OT - Mechanical Drawing Device Identification

    I was going through my father's mechanical drawing stuff and came across this device. I think it was used to enlarge/reduce drawings. I'd like to know it exact name and brief description of how it works. Would anyone just happen to have a users manual for it? Appreciate any assistance. Thanks.

    https://lh3.googleusercontent.com/c9...w276-h207-p-no

    https://lh3.googleusercontent.com/-w...w276-h207-p-no

    https://lh3.googleusercontent.com/gA...w276-h207-p-no

    https://lh3.googleusercontent.com/YJ...w276-h207-p-no
    Bill

    Being ROAD KILL on the Information Super Highway and Electronically Challenged really SUCKS!!

    Every problem can be solved through the proper application of explosives, duct tape, teflon, WD-40, or any combo of the aforementioned items.

  • #2
    Pantograph.

    -D
    DZER

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    • #3
      It is a drafting pantograph, used to copy, enlarge or reduce drawings. Google will turn up examples and instructions for use. They are still available on today's market.
      Jim H.

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      • #4
        It's called a pantograph. You clamp one joint to the table, trace the drawing to be copied with the stylus and the pencil point traces out the enlarged/reduced copy. The holes through which the arms are pivoted determine the scale.

        I've never seen a manual for one. It's too simple a device to warrant a manual. Anyone with mechanical sense should be able to puzzle it out.
        Regards, Marv

        Home Shop Freeware - Tools for People Who Build Things
        http://www.myvirtualnetwork.com/mklotz

        Location: LA, CA, USA

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        • #5
          This link might prove helpful

          .

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          • #6
            I can't read the numbers on the arms with your small photos, but they are probably the various ratios that it is able to do. You should use the same number on all four arms for it to work properly. One point is for tracing an existing drawing and the other one has a pencil or pen to draw the new one at a different scale. They should be reversible. The third one has a stud in it to help it to glide above the drawings instead of flopping on them and dragging. That stud should probably stay where it is. That's about it for instructions.

            I have never used one, but I would think it may be best to use it to pick up center and end points on the drawing and use ruler and compass to do the actual drawing between them for the best appearance.
            Last edited by Paul Alciatore; 04-27-2015, 11:30 AM.
            Paul A.
            SE Texas

            Make it fit.
            You can't win and there IS a penalty for trying!

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            • #7
              Appreciate the help. I couldn't think of Pantograph for the life of me.
              Bill

              Being ROAD KILL on the Information Super Highway and Electronically Challenged really SUCKS!!

              Every problem can be solved through the proper application of explosives, duct tape, teflon, WD-40, or any combo of the aforementioned items.

              Comment


              • #8
                As you said, if you trace along a rule and square the result is better, also making a big one is handy with a plasma torch
                There's another similar gadjet, a planimeter or compensating planimeter, handy for areas
                Mark

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                • #9
                  And to think now, AutoCad does it to a whole drawing at the click of a mouse!
                  Max.

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                  • #10
                    The last time I saw one being used it was huge and something obviously cobbled up for the job, it was being used to place the outline of a transport company's logo on the side of their building. I dont think AutoCad could do that?

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                    • #11
                      Correct, but that is not a drawing, I would have thought that a projected image would also have worked for a building?
                      In AutoCad you generally always draw in full scale, so all actual dimension can be taken off very easily, if necessary.
                      Max.
                      Last edited by MaxHeadRoom; 04-29-2015, 04:55 PM.

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                      • #12
                        About half a century ago, the shop I worked in had a pantograph engraver for making labels. Instead of a pencil it had a wee high-speed burr, and the follow pin moved in grooves in letters set up in a frame. Lifting the follow pin also lifted the burr.
                        The thing was used to engrave labels in that wierd plastic that has different coloured layers. Milling off the top layer allows the contrasting colour to show through. The resulting labels are quite neat.
                        I think these gadgets still exist. I've seen one used to achieve the same result using aluminium with coloured anodising.

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                        • #13
                          the old school equivalent of a pantograph for putting logos on large areas was the slide projector. drive a van into the shop, project a slide of the logo, mask, spray.

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                          • #14
                            Originally posted by Mike Burch View Post
                            The thing was used to engrave labels in that wierd plastic that has different coloured layers. Milling off the top layer allows the contrasting colour to show through. The resulting labels are quite neat.
                            I think these gadgets still exist.
                            They do, but I'd guess that they are less common now that small cnc engravers are more available. So does that plastic material. It is still in use for some stuff, you still see it around on industrial control panels and the like. Some generically refer to it as "lamicoid" though that is a brand name I guess. Like this:

                            https://www.google.com/search?q=lami...macoid&spell=1

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                            • #15
                              Correct, but that is not a drawing, I would have thought that a projected image would also have worked for a building?
                              ....the old school equivalent of a pantograph for putting logos on large areas was the slide projector.
                              Be that as it may, in this case they chose to tape up a small drawing and were using a pantograph to transfer an enlarged version to the wall. If I ever see them doing it again I will be sure to tell them they are doing it all wrong.

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