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Type: Posts; User: greybeard

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  1. Re: Picture mount (mat) cutting with curved opening

    Thanks for heads up on that one, Jeff.
    While it isn't too far from my other part time location in Corinth, it does give me some design ideas.
    Regards
    John
  2. Re: Picture mount (mat) cutting with curved opening

    Here is the diagram of the shape I want to cut. Although the size is a variable, the principle of the machine as I see it should be as simple as possible.
    CNC mount cutters exist, and run to about...
  3. Picture mount (mat) cutting with curved opening

    As if I hadn't enough on my plate, I'm considering the possibilities of this as a next project.

    A picture mount cutter ( I think you call them mats over your side of the pond) that will only be...
  4. Re: Visiting Corinth, Mississippi in September

    Only four weeks to go.
    Don't we have any zone members in Northern MS or Southern TN ?

    John
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    Re: Sourcing small sze stainless strip

    I'll certainly give that a try, so thanks for the suggestion.
    John
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    Sourcing small sze stainless strip

    I'm having no luck in finding a source of stainless steel strip 5 mm wide by 0.4 - 1 mm thick, preferably in UK.
    I've had a quote for laser cutting from 0.9mm sheet, but that's far too expensive....
  7. Visiting Corinth, Mississippi in September

    Hi All,
    I'm going to be in Corinth, MS during September, and it would be a great opportunity for me to meet up with any zone members willing to meet a genuine UK eccentric !
    i shall be reasonably...
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    Re: Hacking A Printer To Directly Print PCB's

    Yet another idea to throw into the pot, though I'm not sure if I've mentioned it before.

    Start with your cnc machine. Replace the router with a spring loaded probe consisting of a polythene tube...
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    Re: Hacking A Printer To Directly Print PCB's

    Of course it would be easier, Russell, but hey, where's your sense of adventure :cheers:
    John
    PS nail decorating parlours may be a local source of small quantities of uv gel, but don't tell the...
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    Re: Hacking A Printer To Directly Print PCB's

    The more i think about this gel idea, the more worried I am about the surface tension effect. If it's sitting on a clean surface of the copper, what sort of problems will occur re the cross section...
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    Re: Hacking A Printer To Directly Print PCB's

    Screen printers, amongst others, use a uv cured resist. It is quite viscous, but might be an alternative route if you were considering the 3d printer approach.
    Perhaps there's a uv curable gel that...
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    Re: Hacking A Printer To Directly Print PCB's

    Hi Old Buddy,
    I was thinking of contacting you on the very same subject earlier this week, but been dashing about, and didn't get round to it.
    It's midnight here, and I'm just back from a 200 mile...
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    Stairlift to cnc ?

    Hi all,
    Been a while since I visited the forum, but alongside various other projects ongoing, I now have a 13' long stairlift installation which I need to take out from the house, after the passing...
  14. Re: Running two machines at the synchronously ?

    I guess it's my own fault for a poor choice of the word 'synchronously' in my title. Trying to keep my cards too close to my chest !

    Basically trying to get the two arms working together, each...
  15. Re: Running two machines at the synchronously ?

    This is very much the way I am going.
    I've built a 6 channel controller/driver, with separate 'homing' circuits for the left and right arms, using optical interupters and logic ic's for each motor....
  16. Re: Running two machines at the synchronously ?

    I have now abandoned the idea of using g-code, and am using a system which is more like addressing the steppers directly in machine code.
    Thanks for your interest, but I now consider this thread...
  17. Hi Paul, Thanks for your input. The 9-axis idea...

    Hi Paul,
    Thanks for your input. The 9-axis idea will be my next approach if the first one has no where to go.
    John
  18. Running two machines at the synchronously ?

    I have built two identical articulated arms, each has three stepper motors.
    This is a question looking for a simple way to run them together, so that the g-code controlling each of them steps at the...
  19. Vegipete, I am deeply grateful. You have given me...

    Vegipete, I am deeply grateful. You have given me an answer to my question that a) I can understand, and b) that I am perfectly capable of building and expanding as necessary.
    Current price of the...
  20. OK gents, I think I'll call it a day. Thanks all...

    OK gents, I think I'll call it a day.
    Thanks all for your contributions.

    Regards,
    John
  21. vegipete

    It comes from the geometry of the m/c build, and I would guess its value will be about 50 +/- 10


    Yes, I see no reason why not.


    This is the number that, when multiplied by the constant,...
  22. Thanks grg12. I'll need pencil and paper to...

    Thanks grg12.
    I'll need pencil and paper to follow that, but looks good after my second reading.

    John
  23. Hi Mariss, I had to giggle a wiki for CPLD, not...

    Hi Mariss,
    I had to giggle a wiki for CPLD, not having come across them, and got this -

    CPLDs were an evolutionary step from even smaller devices that preceded them, PLAs (first shipped by...
  24. I guess that is a fair description, where the...

    I guess that is a fair description, where the 'discrete' also means portable, and to some extent autonomous. I'll go so far as to add that there will be several of them, and synchronized, but that's...
  25. Hi Al, It could well be that in the long run I...

    Hi Al,
    It could well be that in the long run I might go with some micro or other.
    However, at the moment, with my past knowledge waiting to be used, and a load of ics in the junk box, the challenge...
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