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Thread: Gelandagan's Metal Marker MkI - Electro Etcher

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    Wasn't me, I didn't do it gelandangan's Avatar
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    Gelandagan's Metal Marker MkI - Electro Etcher

    Gday guys,
    I have just designed a microprocessor controlled Electro etcher.
    Thanks to Tinbasher - Zac Cheong and Stewart Townsend for the input on the reason for AC and DC current.

    The design I made would do both AC and DC etch, with fully controlled etch time, steady and/or pulsed DC output, and fully controlled AC application for "coloring".
    The time of current application can be individually controlled from 0.5 second to 30 seconds in increment of 0.5 seconds.
    Power input is from a simple AC power supply or a transformer.

    Fully tested using salt water for electrolyte and silk screen for stencil. <-- Btw, Anyone need stencil? I am arranging for pre sensitized silk screen buy, they are ready to be "Exposed" with your design and will be available in blanks of A4 size.

    Why salt water? well, it is NaCl + Fe + H2O -> NaOH + FeCl3


    Anyhow, here is the schematic



    here is the circuit board



    Finished test board and etched knife picture below.
    Last edited by gelandangan; 16-09-2013 at 21:36.
    I trust my Government.. I mean my 45-70 Government.

    http://www.gelandangan.netau.net

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    Looks really interesting Gel. Very interested to see the results! I'd love to get in on that stencil if I could as well mate.

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    gelandangan (16-09-2013)

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    Wasn't me, I didn't do it gelandangan's Avatar
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    Here is the board from front



    From back (this is a test run so it is ugly and full of mistake solderings)



    and here is the test etch on a scrap steel plate



    Tonight I will try to etch one of my knife and post the image tomorrow.

    Thanks for looking.



    Oh yeh.. if anyone one to buy a system, it will be on sale (properly enclosed and with professionally made board) in a few weeks I hope.
    I trust my Government.. I mean my 45-70 Government.

    http://www.gelandangan.netau.net

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    Dealer niroc's Avatar
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    I am in !

    You clever bastard.... better do a better job of soldering though!
    Niroc's Gas Knifemaking and Blacksmithing supplies...
    Catalogue Now Available! Click Here!
    Stay Sharp!

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    Forum Supporter jt75's Avatar
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    Wow. Nice one.

    Couple of questions:

    1. How 'deep' is the etch? Is it something that will come off easily with, say, a light rubbing with wet'n'dry? Or is it more permanent than that?
    2. Is it possible to send a sketch (and blade) to a maker who purchases this for him/her to put that sketch onto your blade? Ie can it be used by the maker to personalise your blade? Or is it just to place their maker's mark on it?

    JT
    I'm normally not a praying man, but if you're up there, please save me Superman: Homer J Simpson.

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    gelandangan (16-09-2013)

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    Forum Supporter Christian Mathieson's Avatar
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    I'd be very interested in one/some of the stencil sheets. Is there an approximate pricing on them?
    Well done with the etcher design BTW.
    Thanks
    Christian

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    gelandangan (16-09-2013)

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    Wasn't me, I didn't do it gelandangan's Avatar
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    Ok, success!




    How deep? well it is adjustable, based on the length of time the current is applied.
    Can it be personalized? I am working on it. I guess it can, but until it is tested, it is much of a guess work.

    I do not know the price of the blank sheets yet, but I guess it should not be more than $25 / A4 sheet.
    It is to be exposed with image from a transparency, then developed in developing liquid (some type of soda).

    Another option is to send me designs and I make the screens, I can do silk screen up to 4 x 6 inch and cost roughly about $30 I use different system to make stencil and it is expensive. Another problem with this is I do not know how long it would last.
    So far,my stencils has been used about 30 - 40 imprints each for trial when testing my machine, I have "burn" a few by setting the current too high, or the etch too long etc.

    Pulsing the current would soften the damage to the stencil for it will etch, cool.. etch.. cool etc so it does not over heat,a nd thus the stencil last longer.

    I will welcome inputs or suggestion for the modes and options for the working of the machine.

    Those that have electro etch, could you tell me how long a stencil will last on standard usage? how many imprints?
    I trust my Government.. I mean my 45-70 Government.

    http://www.gelandangan.netau.net

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    Moderator Stewart Townsend's Avatar
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    Quote Originally Posted by niroc View Post
    I am in !

    You clever bastard....!
    Yes, let me know what your Gelandagan's Metal Marker MkI - Electro Etcher will cost?

    Quote Originally Posted by niroc View Post
    better do a better job of soldering though!
    I won't comment.
    Stewart Townsend
    Vice President
    Australian Knifemakers Guild

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    Dealer Bernoulli's Avatar
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    It's all over my head, but I'm very impressed. Electricity remains magic to me.
    UBUNTO
    "If you don't like my peaches, don't you shake my tree." Doc Watson

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    Moderator Stewart Townsend's Avatar
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    Quote Originally Posted by Bernoulli View Post
    Electricity remains magic to me.
    Me too and my father was a sparkie by trade.
    Stewart Townsend
    Vice President
    Australian Knifemakers Guild

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