May 11, 2019 at 1:26 pm #100110
I had a Rambo running my machine and it started acting odd (seemed like the X axis was not working) I thought I fried a driver on it so I reflashed it with MM3DP software and wired it up on my MP3DPand it works fine. I replaced the Rambo with a RAMPS I had lying around on the MPCNC and ran some tests. No matter what axis I move first, it runs fine. The second axis I run rumbles and grinds like the motors are missing steps or turning opposite each other( they are not, I checked and double checked). The video give you an idea of what I am refering too. I moved the X axis, then the Y axis( grind, rumble) then the Z axis( grind, rumble).May 11, 2019 at 2:39 pm #100116
Sounds like the series wiring is not correct. Your video is private so I am just guessing.May 11, 2019 at 2:58 pm #100123
Can you elaborate on the series wiring? I am using all 5 stepper drivers on the RAMPS board as shown on your website. I dont understand why the second axis always grinds. try this link for the video.May 12, 2019 at 3:45 am #100188
Series wiring the steppers gives you the same current through each stepper in lieu of the steppers sharing the current in a parallel arrangement. See https://www.v1engineering.com/assembly/wiring-the-steppers/ for what this looks like.May 12, 2019 at 5:35 am #100196
Yep, one of the 4 stepper wires isn’t making contact.May 12, 2019 at 5:59 am #100199
I dont have the steppers wired in series. I have them connected like this picture. Even so, why does the first axis I move behave normally and the second one (and the Z axis) always falter? It does not matter which one I move first, X, Y, or Z.May 12, 2019 at 6:29 am #100203
Are you running the dual endstop firmware?May 12, 2019 at 6:53 am #100206
Yes, I re-downloaded it off Github and reflashed it to make sure I had the latest and greatestMay 12, 2019 at 1:18 pm #100219
I might have solved it. I had an old desktop power supply running the machine. I checked the voltage and it was only about 9.5 volts feeding the board. I changed it out to a different power supply(12 volts) and it is behaving normally again. I haven’t had a change to test it under load yet but so far so good. Do you think that would make it act so erratically?May 12, 2019 at 5:41 pm #100242
Yep. I was going to mention power, but got sidetracked.
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