Published: February 24, 2015, Edited by: Mads Hobye

Robot arm v. 0.3.

Design Credit: Nikolaj Møbius, Mads Hobye and Nicolas Padfield, Bo Thorning.

We have made a super cheap (less than 1000 dollars) industrial robot arm to enable students to hack larger scale robotics and to enable small local productions to use robots in their processes without breaking the bank. It is a product of a 3 day sprint.

You can reproduce it yourselv with basic Fablab tools. All the diagrams and software are avaliable below. It is released under CC NC-BY.

More photos can be found here:
https://fablabruc.app.box.com/s/7d8s8wj5lszzbzeefliob6sq0lx58qhs

Video

First run:

Bruteforce testing:

Students experimenting with gesture control:

Gui

http://zapmaker.org/projects/grbl-controller-3-0/
https://github.com/grbl/grbl/wiki/Using-Grbl

How to build:

CNC Diagrams:

https://www.dropbox.com/sh/z767egd28nl7zxg/AAArs4eBXXDk09jff0cIiPuXa?dl=0

Parts (basic setup without hand):

Arduino + Shield + Pins + Cables.
Motorcontroller: dm860A (Ebay)
Steppermotor: 34hs5435c-37b2 (Ebay)
Kit ebay: http://www.ebay.co.uk/itm/151368935245?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
M8x45+60+70 bolts and M8 bolts.
12mm Plywood.
5mm Nylon (Laser cut for gears).
Blind washers 8mm.
Wood Screws 4.5x40mm.
M3 Counter sunk,

Wiring

This is the basic wiring of GRBL:

This is an image of our first version (without end-stops):

Green: Common enable.
Black: Common ground.
White: Dir XYZ.
Brown: Pulse XYZ.

The color codes on the steppermotors does not make sense. This is the order we found to be working:

Upload firmware

Installing firmware on Arduino - GRBL:
https://github.com/grbl/grbl/wiki/Compiling-Grbl

Note: You may get a conflict when compiling in Arduino. Remove all other libraries from your library folder (../documents/arduino/libraries).

Firmware setup

Set enable to newer timeout. Use a serial connection and write:

$1=255

Set homing:

$22=1

Remember to set serial to baud: 115200

Useful G-codes

Set zero point for robot:

G10 L2 Xnnn Ynnn Znnn

Use zero point:

G54

Typical initialization to center robot:

G10 L2 X1.5 Y1.2 Z1.1
G54

Move robot to position fast:

G0 Xnnn Ynnn Znnn

Example:

G0 X10.0 Y3.1 Z4.2 (return)

Move robot to position at specific speed:

G1 Xnnn Ynnn Znnn Fnnn

G1 X11 Y3 Z4 F300 (return)

F should be between 10(slooooow) and 600(fast)

Default units for X,Y and Z

When using default step/units settings (250 step/unit) for GRBL and
stepper drive set up for 800 step/rev the following units apply for all axis:

+- 32 units = +- 180 degrees

Processing code example:

This code can communicate directly with the Arduino GRBL.
https://github.com/damellis/gctrl

Remember to set serial to baud: 115200

Modified version with correct baud rate and homing command:

import java.awt.event.KeyEvent;
import javax.swing.JOptionPane;
import processing.serial.*;

Serial port = null;

// select and modify the appropriate line for your operating system
// leave as null to use interactive port (press 'p' in the program)
String portname = null;
//String portname = Serial.list()[0]; // Mac OS X
//String portname = "/dev/ttyUSB0"; // Linux
//String portname = "COM6"; // Windows

boolean streaming = false;
float speed = 0.001;
String[] gcode;
int i = 0;

void openSerialPort()
{
  if (portname == null) return;
  if (port != null) port.stop();

  port = new Serial(this, portname, 115200);

  port.bufferUntil('\n');
}

void selectSerialPort()
{
  String result = (String) JOptionPane.showInputDialog(this,
    "Select the serial port that corresponds to your Arduino board.",
    "Select serial port",
    JOptionPane.PLAIN_MESSAGE,
    null,
    Serial.list(),
    0);

  if (result != null) {
    portname = result;
    openSerialPort();
  }
}

void setup()
{
  size(500, 250);
  openSerialPort();
}

void draw()
{
  background(0);  
  fill(255);
  int y = 24, dy = 12;
  text("INSTRUCTIONS", 12, y); y += dy;
  text("p: select serial port", 12, y); y += dy;
  text("1: set speed to 0.001 inches (1 mil) per jog", 12, y); y += dy;
  text("2: set speed to 0.010 inches (10 mil) per jog", 12, y); y += dy;
  text("3: set speed to 0.100 inches (100 mil) per jog", 12, y); y += dy;
  text("arrow keys: jog in x-y plane", 12, y); y += dy;
  text("page up & page down: jog in z axis", 12, y); y += dy;
  text("$: display grbl settings", 12, y); y+= dy;
  text("h: go home", 12, y); y += dy;
  text("0: zero machine (set home to the current location)", 12, y); y += dy;
  text("g: stream a g-code file", 12, y); y += dy;
  text("x: stop streaming g-code (this is NOT immediate)", 12, y); y += dy;
  y = height - dy;
  text("current jog speed: " + speed + " inches per step", 12, y); y -= dy;
  text("current serial port: " + portname, 12, y); y -= dy;
}

void keyPressed()
{
  if (key == '1') speed = 0.001;
  if (key == '2') speed = 0.01;
  if (key == '3') speed = 0.1;

  if (!streaming) {
    if (keyCode == LEFT) port.write("G91\nG20\nG00 X-" + speed + " Y0.000 Z0.000\n");
    if (keyCode == RIGHT) port.write("G91\nG20\nG00 X" + speed + " Y0.000 Z0.000\n");
    if (keyCode == UP) port.write("G91\nG20\nG00 X0.000 Y" + speed + " Z0.000\n");
    if (keyCode == DOWN) port.write("G91\nG20\nG00 X0.000 Y-" + speed + " Z0.000\n");
    if (keyCode == KeyEvent.VK_PAGE_UP) port.write("G91\nG20\nG00 X0.000 Y0.000 Z" + speed + "\n");
    if (keyCode == KeyEvent.VK_PAGE_DOWN) port.write("G91\nG20\nG00 X0.000 Y0.000 Z-" + speed + "\n");
    //if (key == 'h') port.write("G90\nG20\nG00 X0.000 Y0.000 Z0.000\n");
    if (key == 'v') port.write("$0=75\n$1=74\n$2=75\n");
    //if (key == 'v') port.write("$0=100\n$1=74\n$2=75\n");
    if (key == 's') port.write("$3=10\n");
    if (key == 'e') port.write("$16=1\n");
    if (key == 'd') port.write("$16=0\n");
    if (key == '0') openSerialPort();
    if (key == 'p') selectSerialPort();
    if (key == '$') port.write("$$\n");
    if (key == 'h') port.write("$H\n");
  }

  if (!streaming && key == 'g') {
    gcode = null; i = 0;
    File file = null; 
    println("Loading file...");
    selectInput("Select a file to process:", "fileSelected", file);
  }

  if (key == 'x') streaming = false;
}

void fileSelected(File selection) {
  if (selection == null) {
    println("Window was closed or the user hit cancel.");
  } else {
    println("User selected " + selection.getAbsolutePath());
    gcode = loadStrings(selection.getAbsolutePath());
    if (gcode == null) return;
    streaming = true;
    stream();
  }
}

void stream()
{
  if (!streaming) return;

  while (true) {
    if (i == gcode.length) {
      streaming = false;
      return;
    }

    if (gcode[i].trim().length() == 0) i++;
    else break;
  }

  println(gcode[i]);
  port.write(gcode[i] + '\n');
  i++;
}

void serialEvent(Serial p)
{
  String s = p.readStringUntil('\n');
  println(s.trim());

  if (s.trim().startsWith("ok")) stream();
  if (s.trim().startsWith("error")) stream(); // XXX: really?
}

Virtual version

For students to experiment with robotics without breaking havoc to the physical surroundings we have made a small virtual processing sketch where they can run the commands and see the effect of their code.

  import peasy.*;

  PeasyCam cam;

  // Units: CM
  float b_height = 0;
  float a1 = 92;
  float a2 = 86;
  float snude_len = 20;
  boolean doZ = false;
  float base_angle;// = 0;
  float arm1_angle; // = 0;
  float arm2_angle; //= 0;

  float bx = 60;// = 25;
  float by = 60;// = 0;
  float bz = 60;// = 25;

  float x = 60;
  float y = 60;
  float z = 60;


  float q;
  float c;
  float V1;
  float V2;
  float V3;
  float V4;
  float V5;

  void setup() {
    size(700, 700, P3D);
    cam = new PeasyCam(this, 300);
    cam.setMinimumDistance(50);
    cam.setMaximumDistance(500);
  }
  void draw() {

    //ligninger:
  y = (mouseX - width/2)*(-1);
  x = (mouseY - height/2)*(-1);
  bz = z;
  by = y;
  bx = x;
  float y3 = sqrt(bx*bx+by*by);
  c = sqrt(y3*y3 + bz*bz);
  V1 = acos((a2*a2+a1*a1-c*c)/(2*a2*a1));
  V2 = acos((c*c+a1*a1-a2*a2)/(2*c*a1));
  V3 = acos((y3*y3+c*c-bz*bz)/(2*y3*c));
  q = V2 + V3;
  arm1_angle = q;
  V4 = radians(90.0) - q;
  V5 = radians(180) - V4 - radians(90);
  arm2_angle = radians(180.0) - (V5 + V1);
  base_angle = degrees(atan2(bx,by));

  arm1_angle=degrees(arm1_angle);
  arm2_angle=degrees(arm2_angle);
  //println(by, bz);
  //arm1_angle = 90;
  //arm2_angle = 45;
  /*
  arm2_angle = 23;  
  arm1_angle= 23;
  arm2_angle=23;
  */
    // interactive:

  //  if (doZ)
  //
  //  {
  //    base_angle = base_angle+  mouseX-pmouseX;
  //  } else
  //  {
  //    arm1_angle =arm1_angle+ pmouseX-mouseX;
  //  }
  //
  //  arm2_angle = arm2_angle+ mouseY-pmouseY;

  draw_robot(base_angle, -(arm1_angle-90), arm2_angle+90 - ( -(arm1_angle-90)));
   // println(base_angle + ", " + arm1_angle + ", " + arm2_angle);
  }

  void draw_robot(float base_angle, float arm1_angle, float arm2_angle)
  {

    rotateX(1.2);
    rotateZ(-1.2);
    background(0);

  lights();


    pushMatrix();

    // BASE
    fill(150, 150, 150);
    box_corner(50, 50, b_height, 0);
    rotate(radians(base_angle), 0, 0, 1);

    // ARM 1
    fill(150, 0, 150);
    box_corner(10, 10, a1, arm1_angle);

    // ARM 2
    fill(255, 0, 0);
    box_corner(10, 10, a2, arm2_angle);

    // SNUDE

    fill(255, 150, 0);
    box_corner(10, 10, snude_len, -arm1_angle-arm2_angle+90); 


    popMatrix();
    pushMatrix();


    float action_box_size=100;
    translate(0, -action_box_size/2, action_box_size/2+b_height);
    pushMatrix();
    translate(x,action_box_size- y-action_box_size/2, z-action_box_size/2);
    fill(255,255,0);
    box(20);
    popMatrix();
     fill(255, 255, 255, 50);
    box(action_box_size, action_box_size, action_box_size);


    popMatrix();
  }

  void box_corner(float w, float h, float d, float rotate)
  {
    rotate(radians(rotate), 1, 0, 0);
    translate(0, 0, d/2);
    box(w, h, d);
    translate(0, 0, d/2);
  }

  void keyPressed()
  {

    if (key == 'z')
    {

      doZ = !doZ;
    }
    if (key  == 'h')
    {

      // set all to zero
      arm2_angle = 0;
      arm1_angle = 90;
      base_angle = 0;
    }
     if (key == 'g')
    {

      println(degrees(V1));
      println(degrees(V5));
    }
    if (keyCode == UP)
    {
      z ++;
    }
      if (keyCode == DOWN)
    {
      z --;
    }

    if (key == 'o')
    {
      y = 50;
      z = 50;
      println(q);
      println(c, "c");
      println(V1, "V1");
      println(V2);
      println(V3);
      println(arm1_angle);
      println(V4);
      println(V5);
      println(arm2_angle);
    }
  }

GBRL Settings

Setting that has proven to work on our robots.

$0=10 (step pulse, usec) $1=255 (step idle delay, msec) $2=7 (step port invert mask:00000111) $3=7 (dir port invert mask:00000111) $4=0 (step enable invert, bool) $5=0 (limit pins invert, bool) $6=1 (probe pin invert, bool) $10=3 (status report mask:00000011) $11=0.020 (junction deviation, mm) $12=0.002 (arc tolerance, mm) $13=0 (report inches, bool) $20=0 (soft limits, bool) $21=0 (hard limits, bool) $22=1 (homing cycle, bool) $23=0 (homing dir invert mask:00000000) $24=100.000 (homing feed, mm/min) $25=500.000 (homing seek, mm/min) $26=250 (homing debounce, msec) $27=1.000 (homing pull-off, mm) $100=250.000 (x, step/mm) $101=250.000 (y, step/mm) $102=250.000 (z, step/mm) $110=500.000 (x max rate, mm/min) $111=500.000 (y max rate, mm/min) $112=500.000 (z max rate, mm/min) $120=10.000 (x accel, mm/sec^2) $121=10.000 (y accel, mm/sec^2) $122=10.000 (z accel, mm/sec^2) $130=200.000 (x max travel, mm) $131=200.000 (y max travel, mm) $132=200.000 (z max travel, mm)

Max MSP Patch

This patch controls up to 6 joints on the robot. This can also be used a generic GRBL controller.


----------begin_max5_patcher----------
6692.3oc6c00biaqj84Y9UvRUk27nEe+w9Vt2J9deYqY2L0lxdRkZJZKZOJi
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-----------end_max5_patcher-----------