How to adjust the torque and the current of the stepper motor?

#1

If you find the output torque of the stepper motor being inadequate, try to: Use the cross screwdriver and turn the current-limiting button gently to the + direction to increase the torque value of the stepper motor. To be more specific, use the cross screwdriver to turn clockwise the button until you feel the obvious increase of the resistance, then turn the button back for about 5%.
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In the meantime, you will also need to update the software.
Download here https://github.com/Makeblock-official/mDrawBot. (Note: The new version has a new function of “Speed-Adjust Button”, which can help slow down the speed when the motor starts shaking heavily. We strongly recommend updating to the newest version of the software.
For user manual & resources: https://github.com/Cration/mDrawBot-resources )

#3

The XY plotter is the first mechanical thing I’ve ever built.

As of right now, my plotter is running 25% (for example: 1 inch of a design =.75 inch when drawn) too slow on the X axis and 27.5% on the Y.

Is adjusting the torque the correct method for fixing this?

Thank you!

#4

@Salvatore_Patrone， yes，you can try to increase the current as my article shows.

#5

Changing the torque didn’t seem to make any difference, I changed the dip switches to HHL, and now it’s about 25% too big. I can adjust my svgs to work in scale, but I’d really like the plotter to draw the actual file size.

#6

@Salvatore_Patrone，for mDraw software, you have to set as HHH.
Regarding the drawing size, its the reciprocal of the value as my red arrow shows，if you want to draw the actual size, you can set it as “1”.

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#7

Per my original post. at 1. scale with HHH switches, it’s drawing 25% too small.
There doesn’t seem to be any skipping with the belts.

Unless there’s some unfathomable behind the scenes scaling happening when saving a .svg file, I can’t figure it out.

#8

For the “scale” to draw according to the imported graphic the scale needs to be set to .25 which is the default 1;1 ratio. your stepper motors and/or torque plays no part in the “size” being drawn. You can also verify that you used the correct size gears and such as this will also cause your renderings to change in size. I.E. larger gears and pulleys will create larger drawings. I hope this helps.

#9