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  1. #1
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Hi everyone,

    I am looking to make a small machine that can draw using a marker pen.

    A3 kind of size
    I would like it to be fast
    light weight
    Wall mounted
    Small Z movement - only needs to lift the pen from the drawing surface
    Control - I would like control the machine using something like an arduino - just drawing predefined images.
    The machine will be on display so the final look is important.
    The drawing "head" of the machine needs to be able to move out of the way so the view of the finished drawing is not obstructed.

    Any advice/ideas/links where to start? I was thinking something like a Delta Robot (is this the right term?) type of thing would be good - fits the looking interesting requirement! - looks very complicated mind....

    Any input appreciated! :)

    Jim

  2. #2
    I think you've just described something like an XY Plotter, mybe the guts of this would do ?

    http://www.ebay.co.uk/itm/CalComp-Mo...item19f29e9262
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  3. #3
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Cheers Eddy - yeah I guess I did kind of describe a plotter! Thanks for the link - Might be a good place to get me started.

    Still tempted by the delta type machine or some kind of 2 motor arm? Does anyone know of any resources that deal with Delta robot type calculations?

  4. #4
    Does this give any ideas ?

    http://orangenarwhals.blogspot.co.uk...-now-with.html

    I used to have a similar thing years ago for a BBC micro only it was an input device. Two perspex arms joined with a potentiometer and both attached to a table with another potentiometer. As the extreme end was moved about over a drawing surface it created a digitised image on the screen. Mapping from the two pots. was quite simple using sin or cos calculations I remember.
    So I was thinking about the reverse, two motors, one attached to the base driving a 'shoulder' the other driving an 'elbow' all moving in the horizontal plane over an A3 drawing area.
    Last edited by EddyCurrent; 01-09-2014 at 04:21 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  5. #5
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    yes! that's the kind of thing - Thanks!

    I think the two motor arm idea would work very well - Also could look very nice/interesting. Also the entire arm could be positioned so that the view of the drawing area is clear.

    Material wise, I will be looking at using brass (or aluminium) with wood for a kind of retro/steampunk look. Would be great to use something like servos but not sure they would be up to the job? Maybe small steppers might be better.....?

  6. #6
    Quote Originally Posted by cncJim View Post
    Any advice/ideas/links where to start? I was thinking something like a Delta Robot (is this the right term?) type of thing would be good - fits the looking interesting requirement! - looks very complicated mind....
    Delta forum for 3d printers...
    http://forums.reprap.org/list.php?178

    The usual software is I think Marlin running on one of the 3d printer boards based on an Arduino (Melzi / Ramps etc). That's probably the cheapest way to get it going because they're commodity items now (a UK sourced Melzi which includes the stepper drivers is less than 50 and there are cheaper alternatives). They read fairly standard g-code with some extensions and some restrictions so shouldn't be difficult to control.

    I've heard complaints that the arduino is a bit slow for a delta because the position calculations are more complex than a linear xyz design but there seem to be plenty of people using them.

  7. #7
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Quote Originally Posted by FatFreddie View Post
    Delta forum for 3d printers...
    http://forums.reprap.org/list.php?178

    The usual software is I think Marlin running on one of the 3d printer boards based on an Arduino (Melzi / Ramps etc). That's probably the cheapest way to get it going because they're commodity items now (a UK sourced Melzi which includes the stepper drivers is less than 50 and there are cheaper alternatives). They read fairly standard g-code with some extensions and some restrictions so shouldn't be difficult to control.

    I've heard complaints that the arduino is a bit slow for a delta because the position calculations are more complex than a linear xyz design but there seem to be plenty of people using them.
    That's great - Thanks for the link and information - Lots of info to digest! I would like my machine to be fast ,and by fast i mean be able to draw quicker than a person would do, but not anything crazy. Maybe something Arduino based would still fit the bill?

    Thanks,
    Jim

  8. #8
    Quote Originally Posted by cncJim View Post
    That's great - Thanks for the link and information - Lots of info to digest! I would like my machine to be fast ,and by fast i mean be able to draw quicker than a person would do, but not anything crazy. Maybe something Arduino based would still fit the bill?
    I think it should be fine for that - if you're using a marker pen, that will probably set the upper speed limit.

    A delta machine for A3 will be fairly large but it will also be quite impressive :-)

  9. #9
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 8 Hours Ago Has been a member for 4-5 years. Has a total post count of 1,000. Received thanks 170 times, giving thanks to others 5 times.
    I know that it's not entirely relevant, but just for fun: robotic painting machine
    Last edited by Neale; 02-09-2014 at 12:20 PM.

  10. #10
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Ha that's a clever idea - I would be interested to see the result if they isolated the machine noise from the the processing.

    So after thinking about it, the delta type robot may be on the back burner. I think the resulting machine will be just too big and I cant see how it would make so the machine does not obstruct the view of the resulting image.

    The robot arm idea has legs though!

    Something like this....
    Click image for larger version. 

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    Last edited by cncJim; 02-09-2014 at 04:10 PM.

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