• Dan
    October 25, 2018 at 10:12 #20999

    in zarplotter.ino there should be a method called IK(). it takes the cartesian coordinates and converts them to motor steps (aka belt lengths).
    Acceleration is trapezoidal and is calculated in motor.ino. You can adjust acceleration within a G command by adding an A value. M114 will tell you the current A.

    Keep me posted on your development, please!

    monkmartinez
    January 21, 2019 at 11:03 #21657

    I am very interested in building the Zarplotter. However, I have a few questions…

    1. Are there instructions on the assembly of what is currently working included in the BOM purchase?

    2. How much, roughly, will it cost to build assuming I have a 3d printer but none of the electronics or hardware (nuts, bolts)

    3. Plans for future development?

    Dan
    January 21, 2019 at 11:36 #21658

    1. No. I know a few people have built one. Perhaps this is an opportunity to make a kick-ass youtube video 🙂

    2. 4 steppers + arduino + motor shield + some nuts and bolts + 4m? timing belt + blue servo + a board + sharpie + a power supply. That’s the minimum. Your price varies with availability and shipping.

    3. I don’t currently have plans myself as I am busy with another robot. A future idea would be springs between the belt and the plotter head to allow a bit of flex; better way of holding the belt against the pulleys; and some way to drop off one pen and pick up another of a different color (automatic pen changer).

    monkmartinez
    January 21, 2019 at 15:12 #21665

    Hi Dan,

    Fair enough and thank you for the response!

    I am actually printing the parts for the MPCNC as we speak. I was hoping for an intermediate project before I jumped in with both feet on the CNC with RAMBO board and all that. This looks like a good candidate but I am torn between this, a SCARA, or one of the AxiDraw knockoffs… or something with a bit more documentation so I can learn that parts that I simply don’t know.

    Dan
    January 22, 2019 at 00:29 #21666

    In another thread we’re looking at building the makelangelo 6 from some very inexpensive components. would work for zarplotter, too. join us?

    starsk
    March 13, 2019 at 01:22 #22125

    Hello Dan. I am following you project. I already have the list of materials. Could you tell me . where I can find a diagram that explain the connections of zarploter?

    Thanks

    starsk
    March 13, 2019 at 01:23 #22126

    Hello @dan. I am following you project. I already have the list of materials. Could you tell me . where I can find a diagram that explain the connections of zarploter?

    Thanks

    Dan
    March 13, 2019 at 09:51 #22129

    Do you mean the physical assembly or the electrical wiring?

    The motors are X=top left, Y=top right, Z=bottom left, E0=bottom right.

    starsk
    March 13, 2019 at 11:00 #22132

    Thanks Dan. But could you tell me if you have a cable digram of the motors to the drivers?. are the motors switch ? I mena the motors are reverse?
    could you send or post a picture of your motors connections on one of your cable bots?

    Thanks Dan

    Dan
    March 13, 2019 at 12:31 #22133

    As I recall they should all be the same, with the red wire on the left.

    starsk
    March 17, 2019 at 08:49 #22155

    Hello @dan. Do you know if the zarploter can be rectangular. or the motor have to be in a square localization

    Dan
    March 17, 2019 at 16:08 #22156

    Yes, it can. Last time I checked it can also be run through the Makelangelo software, so you should be able to set width and height (in mm) in the Settings button.

    cpcoe
    April 12, 2019 at 19:09 #22984

    Hi Dan,

    I am building a machine with Zarplotter attributes, however, instead of a flat surface the end effector is suspended by 4 upper cables. I currently have a 1×1 meter prototype built and am working on the hardware and electronics: 8 nema 17’s (12v, 1.7A), Arduino mega with 4 stacked shields (ams 2.3). I had this assembled before discovering the Makeleangelo and Zarplotter and I’m thinking the Zarplotter firmware might be a close fit for the project. Although I’m fairly robot illiterate I am learning and could use some advice. Is this the appropriate way to engage regarding Zarplotter setup and execution/ modification? should I begin a new thread? please advise,
    cheers
    -CC

    • This reply was modified 1 week, 1 day ago by  cpcoe.
    Dan
    April 12, 2019 at 22:44 #22989

    I like you, you’ve been raised to use your brain and your manners. 🙂
    Four motors in the air? That’s a skycam/Spider cam. Different thread, same subforum. The first version I built was with two arduinos and two AMS shields.

    cpcoe
    April 13, 2019 at 08:26 #22990

    thx,
    to be clear, this is an eight cable robot but for simplicity the upper cables will only act with counter weights whilst the lower four will be actively controlled for positioning and traction. in this way the machine will act just like a Zarplotter but it will be kept on plane through passive suspension. the idea is to keep the math simpler and reduce complexity/cost by reducing the number of controllers and drivers. if this still belongs in the skycam section I will happily move!

    I’m confused when I begin to configure the firmware. I have currently two questions about the process:

    1. basic coding question: when adjusting the commands in “configure.h” do I manually insert “//” before every line that does no apply? for example, would I preclude the list items below that are not zarplotter with a //?

    #include “robot_zarplotter.h”
    #include “robot_skycam.h”
    #include “robot_delta.h”
    //#include “robot_kossel.h”

    2. the micro controller list, no Arduino mega there. but later in “// COMMUNICATION & BUFFERING” Arduino is specifically referenced. am I misunderstanding what a microcontroller is? can I use the hardware I have listed previously to complete this project?

    sorry if these are no-brain questions, but there will be many more if you let me! I really appreciate your time 🙂

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