Two wire brushed motors for E???



  • Is it at all possible to use two wire geared motors as E motors? I have access to hundreds…literally hundreds of geared motors, many of them are geared anywhere from 5:1, 159:1, 248:1 all the way past 1000+:1.

    I guess my question is how accurate can you control a geared motor through just PWM? Is it possible to use a 2 wire motor as an E motor in the duet wifi or duet 0.8.5 (I have both). This would save me a lot of hassle and a lot of money as there are Faulhaber Motors, ULTRA precision gearheads and extremely efficient. The biggest problem is I honestly know very little about all this stuff. I need to be able to do this.

    How could I do this? I also have tiny HEAVILY geared efficient two wire motors that I want to use as an ultra-lightweight delta extruder direct drive motor. It would be epic to benefit from direct-drive on a delta with little to no over-travel due to additional weight. Anyone that helps gets a few motors? :]

    Thank you in advance I have nearly all specs on the motors at the FabLab I go to, unfortunately no one I've talked to wants to or has the time to dive into software they are completely unfamiliar with.

    Help? 🙂



  • I don't know much about it but these guys do http://forums.reprap.org/read.php?1,661444,753227#msg-753227



  • I don't know anything about using two wire geared motors as extruder motors either, but you said in your OP that it would save you a lot of money and hassle. As for the first, you can pick up Nema 17 steppers suitable for driving extruders for around GBP6.00 or USD6.00 so you are not going save much money. As for hassle, with a stepper all you have to do is plug it in, set the steps per mm and the current and away you go. I'd imagine that trying to get a two wire motor to do the same job will be a lot more hassle rather than less hassle.



  • Okay….you're definitely right about that. Bummer, well we do have motors with encoders on them, I should read more.



  • I the cheap nema 17 are good, I have two printers still in development, one's on and off working because I tried cutting corners, one is just a disaster. My FabLab owns a Stratasys uPrint SE and I use that as my standard. If I can beat that precision and consistency, I've made something good.

    I would line to see how precise I can manufacture a part. On my Precision Machining and CNC Automation course it's EASY to get +/-0.005" it's actually pretty easy to get +/-0.002" and our cnc machine is can consistently get +/-0.0002" which is what I'd like to mill out my next printer parts on. Probably going to go with a corexy style with ball screws on every axis.

    The point is, I want to get this technology as close as I can to that so I can easily and quickly prototype an inkjet based 3D printer that I'll use the accurate motors I have access to, because I can.


Log in to reply