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@@ -19,52 +19,8 @@ What you need
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Assembly
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--------
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(see illustrations at http://wiki.fablab-nuernberg.de/w/Ding:Plotclock#Zusammenbau )
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# Use the plotclock PDF file for lasercutting acrylic 3mm or
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use the plotclock SKP file for alternative 3D-Parts.
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The blackend area in the PDF are to be engraved, not cut. This improves grip
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for the servo hubs.
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# swee.stl (a wiper) for 3D printing the cap of the pen with the eraser.
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This can also be constructed from cylindrical parts.
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# Some holes are 2.5mm only, cut M3 threads there.
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# Assemble the servo arms. Gently adjust the counternuts so that the joints
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under the screw heads just have enough play for smooth movement.
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# Load the Arduino software (check the comments).
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http://playground.arduino.cc/Code/time is used as a clock library.
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# Glue a piece of cloth to the wiper with doublesided tape.
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# Connect the servo signal lines to pins 2, 3, and 4 of the Arduino board.
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Employ a small daughterboard for powering the servos, if needed.
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# Test drive the software without mounting servo arms.
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# Complete the assembly as shown in the illustrations. Widen the holes for
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servo mounting if needed. Acrylic is brittle and easily breaks wen the
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mounting holes are to small. Only push the servo arms onto their hubs, don't
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secure them with screws! For initial calibration do not mount the resting
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clip for the wiper (danger of collision with the pen). Glue or screw the
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servo arms to the acrylic parts.
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# When you connect the Arduino, it will first run a calibration routine. The
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arms move between 2 positions, which correspond to exaxtly 90° servo
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movement.
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The calibration values SERVOFAKTOR, SERVOLEFTNULL, and SERVORIGHTNULL allow
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to adjust the actual positions to the ideal ones. Please take care that the
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servos allow sufficient range and do not hit their internal end stops. If
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needed move the servo arms on the hubs.
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# Finally mount the pen and wiper rest. Uncomment the #define CALIBRATION in
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the Arduino scetch or remove the line.
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# Adjust the current time in the Arduino program and you are ready to go.
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See: http://www.thingiverse.com/thing:248009/#instructions
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