Just finished assembling Ramps 1.4 based MPCNC with Dual end stops.
X, Y and Z access seem to work fine if I use them FIRST. This includes auto homing for the X and Y and moving Z up and down.
However, if for example I auto home X then Y or Z may not work properly with one or more of the steppers making a sound like it can’t quite move forward and it does not appear to be moving.
If I unplug, then re-plug and then move either X, Y or Z first then that one seems to work normally.
I’m wondering if its related to the power supply it does say 6A 12 V, but I wonder if the steppers (since there are 5, each connected to its own driver) need more 5 * 1.5A, as 1.5A is the current limit set for each stepper.
It always seemed to occur after the Z was used (which seemed to occur even when homing X or Y sometimes) so I disconnected the Z stepper. With the Z stepper disconnected I cannot get it to replicate.
I’ll see if possibly the Z driver is bad or maybe I did not calibrate it properly.
The calibration looked ok at about .7v and changing to a different driver module did not resolve either.
I can move the X and Y, and autohome as much as I want when the Z stepper is not connected. As soon as I connect it then after Z is used I can home X, but then Y fails.
I tried swapping the other stepper drivers as well, one at time but no luck there.
I just measured the voltage delivered to the ramps board, it is ~ 12 to 12.5 volts when I home X, which also moves Z, then when I home Y it drops to 7v.
Same issue, it is still either your power supply, Ramps, or arduino. So far you have eliminated the driver, as swapping them changes nothing. Next likely problem is ramps (check for solder blobs and shorts under the black plastic strips), next would be arduino. You can test the power supply but will need a load of some sort.
These issues are very common now with the import boards.
One last thing which I don’t think is related. I’d not wired a Z stop switch since I figured I’d manually set Z instead but it does not look like the firmware will let me do that. I guess I’ll just wire a switch in so that I can use it to manually signal the home for Z.