Ramps Stack

If you bought this from here then this has already been done for you just plug in the steppers and go.

Mac user? – info

Any control board can be used to control the Mostly Printed CNC, I choose the Ramps 1.4 stack and here is how to set one up.




First step is make sure you have 3 jumpers under each stepper driver. This puts the ramps board into 32nd stepping when using the DRV8825 drivers (if you use a different driver pay attention to its orientation and step rate).

labeledInsert the drv8825 drivers into the board, with the small silver potentiometers facing the green power plug. Glue on the small heat sinks on to the large chips. The resistor is no longer needed with the most recent firmware¬†Add a 100k Ohm resistor or thermistor to terminal “T0” . Adjust the potentiometers according to your stepper spec sheet (a good place to start is 0.7V, any higher and you will need a fan on the heatsinks). The following video gives a very technical walk through on driver current. For the DRV8825 the quick and dirty formula is set the voltage between the potentiometers and the power ground the 90% (to cut down on the heat a bit) of half the rated current for your steppers.¬† Voltage at the pot=.9*(stepper current/2).




IMG_20151023_104243Add 12V to the power port, and plug in the steppers.

Have you flashed the marlin firmware?



If you are Adding an extruder you need more power

For example.



Power is needed to both sides of the power plug, either by a short jumper wire or another power supply depending on how much current you can supply. In this picture the bottom set, 5A, powers the board and steppers. The top set, 11A, handles the heaters, fans in the d8-10 ports.

Plug in the extra driver for the extruder with its jumpers under it, and the extruder stepper. The blue and black is the hot end thermistor. Blue and white is the print fan, controlled by your GCode, polarity sensitive, D9. Orange and white is the extruder heater, D10. There is also an extra set of red and black wired to the power plug that controls the always on extruder fan, polarity sensitive.