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Thread: Hobo nickels: intricate carvings in coins - GIF and photos

  1. #31
    Jon
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    1:54 Shaun Hughes video:




    Also some vise ideas here: Lindsay Engraving Vises, holders and fixtures
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    Supporting Member rendoman's Avatar
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    Hi all!
    Someone has some good info about how this type of engraver is made?
    Thanks!

  4. #33
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    I think that is some reverse alien technology!

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    Supporting Member rendoman's Avatar
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    At first sight it seems a piston that acts like an hammer. Looking the spring I would think that it works in depression. I remember this tool has a power unit with air flow control. It would be nice to try one!

  6. #35
    Supporting Member Toolmaker51's Avatar
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    Quote Originally Posted by rendoman View Post
    At first sight it seems a piston that acts like an hammer. Looking the spring I would think that it works in depression. I remember this tool has a power unit with air flow control. It would be nice to try one!
    I think your appraisal is correct. A miniaturized pneumatic hammer. I think a piston could be induced to reciprocate like a two cycle engine - where one port is covered alternately. Light spring operated poppets might work too, opened by piston impact, returning to a starting position triggering that poppet.
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  7. #36
    Supporting Member rendoman's Avatar
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    Just out of curiosity, I tried drawing a couple of sketch.
    The left tool should should work with positive pressure, in few words a compression chamber and a piston, like you said a 2 stroke engine. According to this design I think the mass of piston, type of segments and force (plus centering) of the spring should be the key of the tool. At first sight I suppose it would be the simplest way, choosing the right size and pressure should be the hard part. I suppose the limit of this setting is the reloading speed, the spring should be the limit itself.

    The right drawing should be better and perform faster, if well tuned. A good comparison should be like a desmodromic valve system of Ducati against a normal spring distribution, it should run faster. I think here the hard job is the timing of the valve double air, send and return.

    Looking at the commercial product I found in the net, I think the first one should be the most used. I'm thinking about a way to built a simple driver unit to try

    What do you think about?

    Hobo nickels: intricate carvings in coins - GIF and photos-dsc04978_1600x1200.jpg

    PS: I found this link with some interesting pictures, I don't know if it's possible to post, or it's against forum rules. If it's not ok, please delete http://bbs.homeshopmachinist.net/thr...eumatic-graver
    Last edited by rendoman; 12-23-2018 at 07:32 PM.

  8. #37
    Jon
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    Yes, of course you can post links to other forums; we know many of them, and they certainly link to us! We've logged 400+ different forums that link to homemadetools.net.

    You can also browse tools by site, here: Homemade tools by site . For example, here are 509 homemade tools from homeshopmachinist.net: Homemade Tools from bbs.homeshopmachinist.net.
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  10. #38
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    The Chicago Pneumatic CP 9361 Industrial Scribe and Engraving Pen works well as an engraver just change out the pointed scribe for a shaped tool
    They are pricey though And I mean really pricey. at around $300.00 with the regulator
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  11. #39
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    Rendo;
    after googling the desmodromic actuation there are some positives. Doing it miniature may or may not be a challenge.
    So that causes wonder if a motor and valve train could be remote, running the handpiece off a hose? Handpiece could have it's own piston, delivering inertia to the graver. A light spring might induce rearward travel with each reduced pressure wave. Probably not feasible, but I've never considered how to run such a device.

    re google this turned up. A new frame of reference to what I call "real engineers".
    After World War II, when future Ducati engineer Fabio Taglioni wrote his original engineering-school paper on desmodromic valve drive, there was good reason to seek such a system: Valve springs broke at random as an era of rising rpm opened. In the 1950s, NSU pushed to 12,000 rpm,...
    https://www.cycleworld.com/2014/04/2...o-desmodromics
    Sincerely,
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  13. #40
    Jon
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    Audrey Hepburn on 1925 nickel with copper inlay. By myguitarismymistress.

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