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SoliForum - 3D Printing Community → 3D Printer Discussion → question on choosing replacement motors
All I know is I need Nema 14 and Nema 17 motors if I'll ever need replacement.
But there seem to be so many variables besides the size. Which should I pay attention to and what are those specifications of stock Solidoodle 4?
what are those specifications of stock Solidoodle 4?
That would be the key wouldn,t it. I see no specs on there web page.
But there seem to be so many variables besides the size. Which should I pay attention
Of course the frame size this is the NEMA 14,17, 23 etc.
then the length of the motor.
torque spec in newton meters or oz/inches iirc this number ranges from about 76 oz/in to 89 oz in for the NEMA 17 i have looked at for 3d printing. and the amp rating is something to look at.
I suggest you get a spec sheet and llok at before you buy a motor.
There are lots of tutorials on stepper motors . You may want to look at the reprap wiki.
and there is some discussion here.
http://www.soliforum.com/topic/7893/sou … ma-motors/
Tin
I'm really sorry about this, Ian Johnson made a post about this on google groups and I forgot about it completely
This is the Y, Z and E motors- SM42HT33-1334A - http://www.smartautomation.com.cn/Produ … cleID=497. E may actually be different, the extruder motor on my SD3 didn't have a sticker with the part number.
The X is a NEMA14 SM35HT36-1004A http://www.smartautomation.com.cn/Produ … icleID=500
The electronics is a Printrboard Rev E with A4982 stepper drivers.I managed to get my backlash down to something like .03mm according to the dial indicator and still had slight flattening on the circles, so microstepping sounds likely. Would setting the jumpers to 1/4 microstepping show an improvement if the Vref is the problem?
http://www.smartautomation.com.cn/Produ … icleID=500
http://www.smartautomation.com.cn/Produ … icleID=497
http://i.imgur.com/eYTRvPY.jpg
http://i.imgur.com/BS7ImKz.jpg
http://i.imgur.com/OibV0mm.jpg
Now I guess the question is,
if the main variables are
torque,
Amperes
Should I look for a motor with the same torque or Amperage? Or is more okay? Or do I risk damaging my motherboard?
bump
Ya I would be pretty happy if someone more knowledgeable than me chimed in here but here are a few that seem similar in volts, amps, holding torque, etc to the stock models from the above post:
Similar to X motor:
http://www.omc-stepperonline.com/nema-1 … -p-91.html
Similar to Y motor:
http://www.omc-stepperonline.com/3d-pri … -p-17.html
Several more robust models are available at the same website. I wonder if there is any benefit to upgrading to 0.9 degree motors? Yes, you would double the steps/mm and therefore the resolution if I am thinking correctly but at a certain point you are running into moving the nozzle to a greater precision than you can really control the plastic flow (if that makes sense).
Ya I would be pretty happy if someone more knowledgeable than me chimed in here but here are a few that seem similar in volts, amps, holding torque, etc to the stock models from the above post:
Similar to X motor:
http://www.omc-stepperonline.com/nema-1 … -p-91.htmlSimilar to Y motor:
http://www.omc-stepperonline.com/3d-pri … -p-17.htmlSeveral more robust models are available at the same website. I wonder if there is any benefit to upgrading to 0.9 degree motors? Yes, you would double the steps/mm and therefore the resolution if I am thinking correctly but at a certain point you are running into moving the nozzle to a greater precision than you can really control the plastic flow (if that makes sense).
More powerful 0.9 degree steppers would allow you to gain more steps with less microstepping, which ultimately means more torque. So yes, it is advantageous. I have a 60 oz-in 0.9 stepper I will be installing on my Y axis soon.
I don't know how low steps per mm can go on X/Y/Z before the steps become apparent in the prints, but the more steps, the better, if you're not sacrificing torque.
More powerful 0.9 degree steppers would allow you to gain more steps with less microstepping, which ultimately means more torque. So yes, it is advantageous. I have a 60 oz-in 0.9 stepper I will be installing on my Y axis soon.
I don't know how low steps per mm can go on X/Y/Z before the steps become apparent in the prints, but the more steps, the better, if you're not sacrificing torque.
So are you saying that 0.9 degree motors with 1/16th microstepping is better than 1.8 degree motors with 1/32 microstepping? If so, why? Both configurations come out to the same 160 steps/mm (using GT2 belts, 20 tooth pulleys) so I would have thought it is a wash. I'm just trying to understand.
Of course, you could go all out with 0.9 motors and 1/32 micro stepping for 320 steps/mm but I'm just not convinced you would ever see a visible difference. Even with an extremely well calibrated machine that is a tiny distance.
You lose a significant amount of torque with increased microstepping. I don't know how much, I just know that it is significantly easier to stall my axes if I use 1/32. The reason for this loss is complicated, and I only understand how it works on the software side.
1/32 micro stepping should not be any easier to stall. If it is, I would guess there is some other gremlin going on.
There is reduced torque between microsteps, but it does not reduce the full step torque (which is what must be overcome to miss a step).
You cannot lose a microstep, it is not physically possible. You can fail to move on a microstep, but it is not lost. It will be added to the rotation that occurs on the next step (micro or full) that successfully moves the motor.
mdr: 1/16+0.9deg is better IF the 0.9deg motors have as much more more torque than the 1.8deg motors. The reason is that microstep torque is reduced with increasing microstep divisions. If micro stepping a 1/32 driver, the first microstep (1/32) has less torque than a 1/16th microstep. However, the SECOND microstep (2/32) has the same torque as a 1/16 driver.
Thanks for the info. Today I learned.
Would you agree that the motors I linked to are good replacements for the stock solidoodle motors? There were a lot of choices on that site.
Not sure if anyone is still in this thread but...
Would it be worth the extra weight to upgrade the X motor to a higher torque model? How about if you want to go to dual direct drive extruders? The stock model is 180 grams and had a holding torque of 19 oz-in. Here is a model that has 56.7 oz-in holding torque but weighs 290 grams. Worth it?
http://www.omc-stepperonline.com/nema-1 … -p-59.html
The NEMA 17s and 14s have different bolt patterns, so you can't just use the same motor for all axis, although you could make an adapter plate easy enough if you really wanted to.
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