- August 12, 2017 at 3:07 pm #40942
I flashed Marlin onto the board without issues. If I plug the board only to the laptop USB, the display comes on normally and allows you to browse through the menu etc.
If I plug the board to the MPCNC (12V P/S), when I turn it on, the display turns on, but it alternates between dim and bright, each time only showing the “Marlin” logo, and keeps doing that over and over.
I have 2 sets of power going to ramps board as suggested. Do I need to power the arduino 2560 underneath it seperately?
Any idea what might be happening?
JohnAugust 12, 2017 at 3:42 pm #40947
Check your power supply to see if the light is blinking on and off. Either a bad connection or bad power supply. A Picture of your wiring all powered up will let us have a look and confirm everything is correct.August 12, 2017 at 3:57 pm #40950August 12, 2017 at 4:01 pm #40953
The power supply is a 12V 5A/60W
Is this not enough maybe?August 12, 2017 at 4:14 pm #40954
That is more than enough. How about that picture?August 12, 2017 at 4:37 pm #40959
I posted it above my other post. If you can’t see it I’ll post it again, but I can see it hereAugust 12, 2017 at 4:42 pm #40961
12.5v is good but it still sounds like yo have a bad power supply, I see the pic now, the wires seem right but, those are bad power supply symptoms.August 12, 2017 at 4:55 pm #40963
OK I’ll see if I can find another P/S to try.
At least now I know the wiring is correct. Wasn’t sure if the arduino also needed to be powered seperately.
Will keep you posted
Thank youAugust 12, 2017 at 5:18 pm #40965
I just blew the board or both the ramps and arduino, not sure.
I have a bench power supply good upto 5A. I just found out there is something wrong with it because it put out possibly upto 45V into the board. I unplugged it and measured with meter and noticed the voltage went upto 45V. The bench supply’s voltage meter wasn’t working. Anyway, plugging it back into USB, there is no flashing green light anymore.
I wonder if both boards are blown or how to find outAugust 12, 2017 at 5:20 pm #40966
45V?!, look for the burnt component.August 12, 2017 at 7:04 pm #40974
Nothing looks burnt. lights come on on the mega 2560 but doesn’t show up on the PC when plugged into the USB.
I think it’s all dead. Probably the drivers too I guessAugust 12, 2017 at 7:49 pm #40982
Is it possible that I just burnt the poly fuses on the ramps?August 14, 2017 at 2:30 pm #41263
It is possible. Looking at the thread, I think your initial issue may have been a failing 5v regulator. That would explain why they screen is correct when powered via USB, but flakey when powered via the 12v line. I have a RAMPS stack that has the same behavior and has been that way for 2 years. Normally not an issue, as when it is in operation I have both the USB (to a Raspberry Pi) and 12v from the PSU at the same time.August 15, 2017 at 9:32 pm #41446
I noticed in some youtube videos the stepper plug has the wires in the order of blue, red, green, black. I have mine red, blue, black, green. Do I need to change it to the first mentioned order or is it fine the way it is? So basically the coil wires are switched on both coils of each stepper.August 16, 2017 at 6:40 am #41455
Nope that just reverses the direction they move.August 16, 2017 at 12:15 pm #41497
So I would just need to invert the direction in Marlin?August 16, 2017 at 12:23 pm #41499
Or just flip the plug.August 18, 2017 at 2:13 am #41716
OK I’ll try that when my replacement hardware comes.
ThanksAugust 18, 2017 at 2:50 am #41717
I might be wrong about this its a little bit hard to tell.. but it seems to me that on the picture the drv8825’s are reversed.
1 user thanked author for this post.August 18, 2017 at 7:55 am #41744I might be wrong about this its a little bit hard to tell.. but it seems to me that on the picture the drv8825’s are reversed.
OMG, you’re right. Thanks Jakob.
John your drivers are in the wrong way, look at my picture vs yours. the little silver pots are supposed to be facing the power plug. Chances are really good those drivers are toast now but flip them and give it a try.August 25, 2017 at 4:28 pm #42316
I ended up replacing the whole electronics due to my smart actions last time. Funny thing is the power supply (originally thought was the issue) now works after first trying the bigger replacement. I don’t know why I couldn’t get the axis to move last time, but now we have action. I had to swap green and black (or other pair probably same result) on one stepper per axis because when I tried moving the axis this morning, they moved in opposite direction, so just flipping black and green on one motor, fixed the problem. This was the case for both x and y. Don’t know where I went wrong in the wiring but it’s good now.
I’m hoping to (if not cut anything today) at least get something to draw on paper to see some action, and much needed satisfaction. Is there a youtube tutorial on what software to use (Estlcam?), what’s the easiest and how to use it. Basically a tutorial on first use of the machine. I know 3d printing pretty well, but I know absolutely (zilch) nothing about cnc cutting etc.
You guys rock. Your help is very much appreciated
JohnAugust 25, 2017 at 4:34 pm #42317August 25, 2017 at 4:46 pm #42320
Ryan thanks for your fast reply.
I still have some tidying up to do and hook up the spindle and speed controller, but either later today or tomorrow I should be ready for loading up some gcode and crossing fingers.
Thanks again, will let you know how I goAugust 25, 2017 at 9:38 pm #42334
I have just loaded the “crown” in the example and run it. After a couple attempts I got it to sketch on paper. A few little issues:
- How can I predict or know where it will start to sketch/cut
- Can you set a “Home” without endstops?
- My sketch was drawn up-side-down
Definately getting there. BTW, I tried adding an endstop, but as soon as I plug it in to the board and try to move say 100mm, it only moves in short bursts and stops, almost seems like it’s moving 5mm then stops, then you command it to move another 100 and does the same. Unplug the endstop and all is good. WeirdAugust 25, 2017 at 11:12 pm #42340
This is my best attempt so far. The small circle isn’t really a perfect circle. What do you guys think?
Attachments:August 26, 2017 at 8:53 am #42372
1-It starts right where the tool is, that is “home”
2-Hit reset on the board, boom, home.
3-Flip your Y axis wire over, on the same page as that crown it gives a link to correct it.
If you really want to monkey with and endstop either change the firmware or wire them normally open. Have a look at the FAQ’s and really think about how you would use an endstop when your work piece is never in the same place???August 26, 2017 at 3:01 pm #42402
Great thanks mate.
I’ve been doing some more drawing tests this morning and noticed at one stage the steppers were skipping steps. So I checked the voltage on the drivers and they were around the 0.7V mark. I know that’s pretty low, and without doing any measurements and calculations I upped them all to around the 0.91V mark. No more skipping and the steppers stayed cold for the 10 minutes it was doing the job. Since we all pretty much use the same steppers (Nema 17), is someone able to tell me what is a good voltage to set the pots to? I guess I may still experience skipping when I move to cutting rather than just using a pen which has almost no force on it.August 27, 2017 at 5:22 am #42427
.7 is the standard voltage to set them to.August 27, 2017 at 8:27 am #42439
You have drv8825 drivers? At .9V the drivers would be insanely hot as well as the steppers. It sounds like you have different drivers or you are wired in parallel.August 27, 2017 at 8:28 am #42440
Skipping steps could also mean you are trying to move it to fast. If you are unsure upload your gcode.
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