Exercising slow

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Track cropped lr.jpg

All questions about motion or speed are only complete with an appropriate frame of reference.
Exercising slow at 50.8357°N & 4.3615°E,
I find myself in between projects, exploring our perception of time in preparation of a new installation.


The gearbox consists of several Polyethylene water cut gears driven by an Ametek surplus DC motor controlled by an arduino + motorshield.

AMETEK 38VDC 900 RPM MOTOR - 900 RPM AMETEK, #965922-101. Permanent magnet DC motor rated 38 VDC nominal. Reversible, ball bearing. Max. rated rpm is 1300 max. Armature current before permanent demagnetizationis 12 amps. Torque constant is 50 oz-in per amp. Terminal resistance 20ohms +-20%. Voltage constant is 37 VDC per 1000 rpm. When tested on 38 VDC, we recorded the following data: No-load spedd 1100 rpm @ 0.260 amp. With a 100 oz-in load the shaft speed was 900 rpm @ 2.3 amps. When tested as a generator at 1000 rpm, the output was 5.8 amps @ 12 VDC. Shaft: 5/8" dia. X 1-5/16" long. The opposite end of the shaft has a turned down diameter and a flat mounting area with two sets of tapped holes. This was probably originally intended for an encoder or tachometer mounting. This shaft has an outside dia. of 3/16" and is approx. 3/8" long. We do not have the encoders whtat were mounted on this motor, but suitable encoders are probably available from encoder suppliers if required. The motor has five #10x32 tpi tapped mounting holes on the shaft end of the motor body. Electrical connections are via 3-1/2" long flexible wires. Dimensions: 4" dia. X 4-1/2" long (excluding shafts). $74.50 Ea. MD548

Working with module 4 gears which are water cut out of PE.
I originally designed them using vectorworks to built a generator for a windmill. Now I recycled them to built the gear to pull the stone. Now I just use a sketchup plugin to design them.


  • The length in mm of the pitch circle diameter per tooth. >> MOD = PCD / N
  • The number of teeth on the gear. >> N = PCD / MOD
  • The diameter of the pitch circle. >> PCD = N x MOD
  • The distance between the axes of two gears in mesh. >> C = (PCD(gear1) + PCD(gear2))/2

All about measurements of module 4 metric gears : http://www.metrication.com/engineering/gears.html

concrete block 19/39/9 cm 8.6 kg birch platform 25.5 cm

nadine platform 15 meters long

Mirror setup

plummet picture plummet exploded view plummet picture plummet picture


Here's the code I used to drive a linear actuator hooked up to the Nanotec SMC11 stepper driver board.

/* Code to control the Nanotec SMC11 stepper board from an arduino
int EnPin = 2;      // Enable low = active, high = disabled
int DirPin = 3;      // Direction low = active, high = disabled
int ClkPin = 9;   // CLK
int sensorPin = A0;    // select the input pin for the potentiometer
int sensorValue = 0;  // variable to store the value coming from the sensor
int CurrPin = 6; // Current enable pin
int incomingByte; 
int ctrl = 0;
void setup()
  pinMode(EnPin, OUTPUT);   // sets the pin as output
  pinMode(DirPin, OUTPUT);   // sets the pin as output
  pinMode(ClkPin, OUTPUT);   // CLK
  digitalWrite(EnPin, LOW);
  digitalWrite(DirPin, LOW);
  digitalWrite(CurrPin, HIGH);
void loop()                     
 // Serial commands to arduino F = Forward, B = Backwards, S = Stop motor   
    if (Serial.available() > 0) {
    incomingByte = Serial.read();
        if ( incomingByte == 'F'){ 
            ctrl = 1;
        if ( incomingByte == 'B'){ 
            ctrl = 2;
        if ( incomingByte == 'S'){
            ctrl = 0;
    switch (ctrl) {
    case 1:
      //do something when var equals 1
    case 2:
      //do something when var equals 2
    case 0:
void run()
  digitalWrite(ClkPin, LOW); //active
  digitalWrite(ClkPin, HIGH);//disabled
void forward()
  digitalWrite(EnPin, LOW);
  digitalWrite(DirPin, LOW);
void backwards()
  digitalWrite(EnPin, LOW);
  digitalWrite(DirPin, HIGH);
void stops(){
  digitalWrite(EnPin, HIGH);

xbee config

Using moltosenso network manager iron to configure Xbee modules. Using Xbee Pro series 2



minimal music. 57210982, http://en.wikipedia.org/wiki/Minimal_music, stasis