If this question has been answered before sorry I couldn't find it. I built a Mendel90 1.5v with Gen 7 motherboard and ATmega1284P chip. I'm using Marlin 1.0.0 because it's the only one I can get to compile right for now. I'm also using Arduino IDE 1.8.12 and Pronterface to do the printing. Here's the problem my z axis stop switch is at the top left as per the build manual. The z axis always homby KennTech - Mendel90
Quotephaedrux Amazon carries a surprisingly large amount of 3D printer related gear. some of it is shipping out of China, but some is next day shipping as well. Hi Phaedrux, Thank you for the reply. I don't do Amazon, had to many friends tell me they got the wrong item and had to pay for return shipping for some one else mistake. Ebay is no better you never know if you're get a new or used parby KennTech - General
Hi oysteinkrog, thank you for your reply. I looked at the "shop prusa3d" page briefly and plan to go back to check it out more. I did buy 3 more stepper motors from ZYLTech which is in Huston TX. I should get them by Friday and change out the old motors. I also bought LM8UU bearings from AliExpress for a great price and I know I wont see them till the end of the month. That's okay as I have pleby KennTech - General
Hi thank you for the reply. I wanted to ask were you folks get your stepper motors from? I'm in Pennsylvania USA and when I do a google (shopping) search say for example a 25Ncm motor, I get everything else but a 25Ncm motor. Are there any place in the USA that you order stepper motors? Thank you, Kenn.by KennTech - General
Hi thank you for your reply. QuoteMKSA Check the ones you got from this dot matrix printer, most probably they are of the 12V or 24V type. If so, better put them for the Zaxis that is less demanding and use the new ones for X Y extruder ! The motors I got from the dot matrix printers are 12 volts, but only have (1.34 oz in) to low to turn the Z-axis. Before anyone was replying on this forum Iby KennTech - General
Hi, thank you for replying. Quoteetfrench Why do you think that one will work better than the 84 oz-in? If both are run at 1.5 amps, which will have more holding torque? Which has better phase resistance and inductance? It's not that it's better I all ready ordered 3 motors two were going on the z-axis. Plus when I built the Mendel90 I built it with the small motors I had from the Beckman dotby KennTech - General
I found this one on Stepperonline: ]Nema 17 Bipolar 1.8deg 36Ncm (51oz.in) 1.68A 2.8V 42x42x39mm 4 Wires It's the only one close to dc42 description and they only sell it from China.by KennTech - General
QuoteMKSAGee, you are making a mountain out of a molehill. All you guys have been through tough dissisions of selecting the parts for your 3D printers. You took chases made mistackes and made corrections, you've figured out what works and what doesn't work. You have the knowledge that I lack, I'm trying to obtain the correct knowledge. So I can make as few of mistackes as possible and a inforby KennTech - General
Hi Dc42, Well my power supply is 12 volts and the DRV8825 driver boards can go to 2.5 amps. So I guess I'll look for motors that are up to 2 amps and around 2 to 4 volts. But I'll have a time trying to find them not to many chooses online. Thank you, Kenn.by KennTech - General
So Dc42 what you are saying is to look for the lowest EMF volt rating for any given stepper motor. Is that correct?by KennTech - General
Here's a web page that explains it even better. http://blog.inventables.com/p/stepper-motors.htmlby KennTech - General
Hi Dc42, thank you for the reply. I found this web page that goes into a little more detail about the dynamics of stepper motors there voltages and current. An interesting explanation about steppers voltage rating I'll see if I can find other pages that talks about the stepper motor voltage ratings. This will help with the EMF calculator. Thank you, Kenn.by KennTech - General
Quoteetfrench See dc42's earlier post about the EMF calculator. As nice as it was for dc42 to show me the EMF calculator, it only has 3 printer geometry and none are the Mendel90. I did save it for later use if I build a Delta printer. Plus I don't have the money to buy a 24 volt power supply. The 12 volt power supply was free out of a discarded computer. Right now I'm not looking for speed soby KennTech - General
Hi Etfrench, thank you for the reply. So what I getting from you is that the DRV8825 doesn't change the voltage coming from the 12 volt buss. It sound like if I plug one of these low voltage stepper motors in to the 12 volt buss that it would fry. I can adjust the DRV8825 current but it is still going to put 12 volts to the stepper motor. Thank yoou, Kenn.by KennTech - General
Hi Dc42, thank you for the reply. So what you are saying is to use a low voltage, higher current stepper motors for the x and y axis because they need the speed. The z-axis doesn't really move all that much during operation maybe 1mm at a time. The Mendel90 https://reprap.org/wiki/Mendel90 Thank you, Kenn.by KennTech - General
Thank you for all the good advice, but I didn't think anyone was going to answer after 200 viewings so I bought the Nema 17HS15-0404S. Not a total loss they were only $7 with free shipping, total of $21 dollars. I guess I'll use them for the z and y axis. The extruder setup I'm trying to do is a MK8 with Bowden tube in order to keep the weight off the y_axis. I have the MK8 attached to a pieceby KennTech - General
Hi Sungod3k, thank you for the reply. I did find the Duet wiki page : Duet Wiki choosing a stepper motor When I was younger I worked for a company that manufactured stepper motors so I have a little back ground in them. It did take me a few times going through the page to under stand what they were getting at, but for a newbe it might be over welming. I find that most of the documentation saysby KennTech - General
Hi, sorry if I'm putting this in the wrong place but I'm new to the forum. Back in 2016 I built a Mendel90 with a Gen7 1.5v mother board and used stepper motors from 2 old Beckman dot matrix printer plus I had a extra stepper motor as a spare. The stepper motors I have are Astrosyn 17PS C026-02. I've looked online for a datasheet but could not find one. I think these stepper motors only have 28by KennTech - General