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We can do it in two different ways: measuring the voltage or current intensity. We recommend doing it with current intensity, as it is safer and simpler.
We are going to calibrate the current intensity we want for each axis and for the extruder. The needed current intensity depends on each printer. In the case of our P3steel, we calibrate them as follows:
Thus each motor receives 0.3A, except the extruder, that received a bit more (0.4A).
We connect the LCD, the stepper motor in one axis and the stepper motor driver to calibrate in the same axis, carefully not to connect it the other way around.
We upload the firmware, if we haven't done it yet. We have two options:
We connect the thermistors to have a real reading.
We use the "Dummy" temperature tables for the thermistors, and we will have a programmed reading:
* 998 : Dummy Table that ALWAYS reads 25°C or the temperature defined below.
* 999 : Dummy Table that ALWAYS reads 100°C or the temperature defined below.
We connect the power supply in series to the 5A feeding of the Ramps 1.4 measuring direct current with the polimeter, following the scheme:
We turn on the power supply and we annotate the value that gives us the polimeter (0.08 A in this case).
We move the axis which we have connected the stepper motor and driver, and we annotate the given value. The current intensity that has the driver is the second value (0.65 A) minus the previous value (0.08 A), being 0.65 – 0.08 = 0.57 A in our video.
This driver is meant to be the X axis driver, so we have to turn the potentiometer until it gives 0.38 A, which is 0.3 A for the X axis + 0.08A for the electronics.
We have to do this step with every driver we are going to use. We can just change the driver without changing the position of the stepper motor, ordering from the LCD to move the same axis, knowing for which position we are calibrating it. Or changing the stepper motor depending on which driver we are going to calibrate. We have to have in mind that the extruder stepper motor will not move if we have activated the its protection and the temperature is below 170ºC.