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Changing DC motor speed

drummerboyx

Changing DC motor speed
December 17, 2009 06:49PM

Registered: 14 years ago
Posts: 97

Hello,
I have a DC motor extruder with Arudino Gen 2 electronics. My extruder is extruding a little too fast and I can't figure out how to slow it down. Can I do this in the host software or do I have to do it manually in the Arduino code itself.
Thanks,
Drummerboyx

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drummerboyx

Re: Changing DC motor speed
December 17, 2009 06:49PM

Registered: 14 years ago
Posts: 97

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stephen george

Re: Changing DC motor speed
December 17, 2009 09:13PM

Registered: 16 years ago
Posts: 242

Extruder speed is an M command.

It is supplied by the reprap host / skeinforge software.

To add confussuin we have two sets of units

PWM and MM/minute. You will be PWM which has a range of 0-255.
(3000MM/Minute which is the reprap host software default may get converted to 255)

// Set speed of extruder
M108 S100;

// set temperature guard
M124 S020;

// start motor
M101;

regards

Stephen

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drummerboyx

Re: Changing DC motor speed
December 18, 2009 04:10PM

Registered: 14 years ago
Posts: 97

How would I change it in the the host software? Is there a box in the preferences window?

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stephen george

Re: Changing DC motor speed
December 18, 2009 09:25PM

Registered: 16 years ago
Posts: 242

Drummerboyx

I am sure you have my updated version of the firmware.
Anyway if you look in tested section of Gcode_interpreter.pde you will find

// Reprap Newest software (global.FiveD=false,extruder0.extruder speed 255)

Try setting the extrude speed to 210 on the extruder0 screen.

regards

Stephen