- December 19, 2016 at 4:05 pm #22999
Is there anything that would cause the Z motor to get very hot? It is doing a fraction of the work of the X and Y but it gets very very hot. I cant figure out why. Everything is from you Vicious1 nothing changed on my end.December 19, 2016 at 4:47 pm #23001
Has it always been “hot”. Can you give an estimate of what “hot” is. Theyvare rated to i think 50c over ambient. But since we use pla best to keep them under 60c.December 19, 2016 at 5:48 pm #23004
My z gets warmer too for sure. My xy barely get warm, if at all. I think this is because of that thing about how steppers work, the way they deliver power in their phases. And apparently a moving stepper actually stays cooler. It also might have to do with only 1 stepper on z, which the xy have 2 set up so the current is limited. Or does the ramps send out twice the current for xy? Not sureDecember 20, 2016 at 7:26 pm #23095
Hot to the point I can’t hold my hand on it tight for more than 3-5 seconds. Like very hot. I have a laser thermometer somewhere and will try to get an actual measurement. It’s just wierd and counterintuitive. I’m glad I’m not the only one though.December 21, 2016 at 10:42 am #23146
Not the motor that runs the extruder. The one that pulls the gantry up and down.December 21, 2016 at 5:49 pm #23173
What is the voltage of your z axis stepper driver?December 22, 2016 at 4:21 pm #23216
How would I know that? As in how do I test and get that number for you? It all came straight from you so I never had to learn how to do any of that.December 22, 2016 at 4:24 pm #23217
Unplug all power sources and try swapping the y and z drivers see if that helps.
To check you need a multimeter.December 24, 2016 at 2:48 pm #23306
OK I swapped them. If anything its hotter. I have a multimeter where do you want me to test?December 24, 2016 at 2:50 pm #23308
From the power plug ground to the small silver pot on the drivers. 0.7V is what is should be close to.
Are you sure it is hot enough to burn your hand? Normally the driver will shut down from thermal overload long before that point.December 24, 2016 at 7:10 pm #23325
Its hot enough that I cant hold it tight for more than 3-5 seconds before I am forced to let it go. Trying to find the laser thermometer to get you an actual reading. The heat sink on that particular stepper gets way hotter than the other 3 also.December 24, 2016 at 9:03 pm #23331
If it helps at all, my xy steppers get to about 85f, and my z gets to 115f, running the stock vref. Check for binding in your z, and I found that putting some white lithium grease on the all thread made it a lot smoother.December 26, 2016 at 2:40 pm #23433
Yep it reads .7
there doesn’t seem to be any resistance in the movement and I have Lithium on it. Shouldn’t matter either way as there is very little movement while printing. its .2 mm per layer at 28 mm/s so shouldn’t be taxed at all.December 26, 2016 at 2:54 pm #23435
Found my infrared thermometer. Z is at 128 degrees. X is 99 and Y is 100. Does that seem right?
Fahrenheit btwDecember 26, 2016 at 2:55 pm #23436
I really am not sure, since works and the setting are correct. Physically swap the steppers, and see if the problem follows.
Even though it isn’t moving the stepper stays powered up to hold it’s position.December 26, 2016 at 2:57 pm #23437
That is much hotter than mine but well within specs, they are rated for I believe 50C over ambient.
You can turn the driver down as well that will cool it down. go down in .1 volt steps or less.December 26, 2016 at 8:21 pm #23496
OK. I mean if its ok then its ok. Just seemed really extreme. I did the swap with the Y and it stayed the same. So not in the stepper. Guess thats just where it sits at. Thanks. Just had me worried.December 26, 2016 at 8:26 pm #23497
Just turn down the pot on the driver. If you have a meter it only takes a second. Now that we have squashed the software bug we should not be having z axis issues anymore anyway.December 26, 2016 at 9:15 pm #23505
I’m not. After much much much learning and tuning i am getting great quality prints. The heat just concerned me as it was so much hotter that the X and Y which do way more work. Does turning it down to say .6 or so change any settings or values?December 26, 2016 at 11:13 pm #23508
No not at all. Turning it down should do nothing but cool it off a bit. too far and you will start to lose power but .5v or so I doubt would be a noticeable loss in power. Better than warping a mount from the heat.December 30, 2016 at 10:33 pm #23980
Just an update:
Brought it don to .6 and worked like a charm. Its pretty warm but not alarmingly warm. Once again thanks!!!April 9, 2017 at 12:57 pm #31146
I know this post is a few months old, but when testing my MPCNC with the MKS SBASE board, I noticed the Z axis motor makes a slight noise after moving the X or Y axis motors. After only a few minutes of testing, the z axis motor is warm & the x & y are room temperature. I am guessing the Z motor needs to be running some to keep it engaged. Mine does not get warm enough to worry about after 20 minutes of running, but thought this might be part of the issue of the Z motor getting warmer than the X & Y.June 7, 2017 at 6:33 pm #35423
I turned down the POT to the driver as Ryan suggested and it fixed it right up!June 7, 2017 at 6:38 pm #35424
That is totally normal. The steppers make a slightly annoying ring when they’re activated. Once you tell them to move they activate and try to keep that position. My z also gets warmer but it’s fine. I really wanna try out that new leadscrew though 🙂June 7, 2017 at 6:54 pm #35425
new leadscrew?June 7, 2017 at 8:44 pm #35427
Dui, ni shuo de duiParticipant
Another method, which is the one I used, is to replace this motor by a bigger one. On my machine the motors are cold, but the drivers gets hot. But it is much easier to cool down the drivers since they all are in the same spot. So if this turns out to be an issue, just replace this motor by a bigger one (by bigger, I mean longer here, they are actually the same diameter).
And yes, it is normal that the Z motor gets hotter. The reason is that you want the motor not to move at all, so the stepper driver sends it current to hold the position. This current is quite higher than the current you need to jump from a position to another, so the motor gets warmer.
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