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modifying the cheap stepper motor Howard Ind. 1-19-4200 from unipolar motor to bipolar (no replies)

July 25, 2013, 11:10 pm
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From time to time NEMA17 stepper motors from Howard Ind. are sold very cheap at places like ebay or pollin.de for as low as 1 or 2€.

A few months ago I got a bunch of Howard 1-19-4200 motors at pollin.de and wondered if they can be used for building a Prusa.

The short answer is:
- For the Z-axis: yes, they are perfectly suitable.
- for X and Y it depends on your setup, but in any case you will be limited to slower movements. Better accept to spend money on bigger motors.
- for the extruder: no, hopeless.

The motors are unipolar motors, but with some not-so-diffcult internal modifications they can be changed to bipolar.


I compiled a report on the needed modifications here: [makr3d.de]

I hope this proves to be useful for somebody here,

Michael
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Help Inconsistent Steppers (no replies)

July 29, 2013, 2:35 pm
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Hi Folks:

I'm at my witts end. I'm working on a Sumpod Aluminum. I have a proper Marlin firmware modified for the machine (provided by our friends that have the same working machine).

Here's what I have. Arduino|+Ramps (supplied by sumpod and probably off brand) we were able to get the LCD and encoder working properly, but we can't get a consistent output on any or the x,y or z motors. We have tried rewiring the wires for polarity, we have switched populos and we have adjusted the pot on the populo's. What we get is simply, inconsistent operation of the motors. Sometimes the motors don't react at all to the manual control. Sometimes it reacts and just pulses, sometimes, it turns and turns, and it turns only one direction regardless of the direction manually indicated. We have had the same result with two different motors, and different populo's and on different axes. I've also just run, the RAMPS diagnostic. I'm not 100% sure it was correct, but i had no reaction from the machine at all. I assume that after loading and turning the machine off, it is supposed to go through it's routine, in my case...nothing happened.

I also have now bought an official Arduino plate, and RAMPS from GRRF. When I uploaded the firmware, well from the first view...something like Eithopian script showed up on the LCD. So obviously sumthing must be changed in the firmware for the different boards...but really i have no idea where to start on this.

So if anyone can throw some sunshine on this situation, I really appreciate it.


Best Regards
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Motor Friction torque (no replies)

July 29, 2013, 3:02 pm
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Hello
i demand a total amount of friction torque.
(Tf=To+Tb+Tj, To=friction torque of bracing shaft, Tb=friction torque of free shaft, Tj=friction torque of motor shaft, according to the ball screw catalogue)
i have found a formula for Tj, which is:
Tj=µ*M*g*P/(2pi) [P=pitch(m)]

Now, i have two question:
First, I want to know what are common magnitudes of friction torque for Tb and To? (Tj=0.04)
Second, how could i notice the pitch value of ball screws?

Thank you ♥
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Finer step angle (7 replies)

August 18, 2013, 8:05 pm
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Hello,

I was looking for a NEMA17 stepper motor for the second extruder I am making. I stumbled on to this web site, which sells a few variety of stepper motors. The price looks decent, too.

However, the motor I would like to get has step angle of 0.9 degree, which is half of the step angle of all the other motors I have on my printer.

If I want to use this smaller step size motor in my printer...

1. I have to make updates to the firmware, and my RAMPS will be able to control this motor more accurately.
2. I don't have to make updates to the firmware, but it will be a good idea to do so b/c my RAMPS will be able to control this motor more accurately.
3. I don't have to make updates to the firmware, this motor will be automatically more precise thanks to its smaller step size
4. I have to make updates to the firmware, but there will be no gain in accuracy
5. I simply cannot use this motor.

Which one of above will be correct?
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NEMA 17 VM42HT47-1684A (2 replies)

September 4, 2013, 3:35 pm
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Hi All!

I would like to build a 3d Printer (Prusa Mnedel i2).

My question is:
Is it possible to use NEMA 17 VM42HT47-1684A?

Specification in attached file.
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TB6600 wiring help (4 replies)

September 13, 2013, 10:00 am
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kindly someone help me in wiring a ebay tb6600 board to parallel port
i am having doubt in EN- and pul-

[www.ebay.com]
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Blocked Nema17 Stepper motor (1 reply)

September 15, 2013, 9:26 am
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Hello everyone,

today i was running one of my first ever prints.
It went perfect, until my x-axis blocked en the whole print was failed.
I have a Nema 17 stepper motor, i feed it 0.4V.
I can't even turn the motor by hand when it's off.
Does anybody has a clue?

Thanks
Vancoillie
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Stepper Motor juddering and reversing direction (no replies)

September 17, 2013, 5:32 am
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Hi

I am having a strange issue with one of my Nema 17 z motors (the end that carries the X axis motor)

After working fine for about 3 hours, it will now only judder or move in in 1 or 2 1/4 rotations before reversing the direction.

I am using Ramps 1.4, Sprinter firmware and pronterface.

I have tried this motor on other axis and it does the same thing. Other motors connected to Z work fine.

Do these motors breakdown if put under to much strain?

Martin
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need to buy crimp housing for wires (no replies)

September 23, 2013, 7:25 pm
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the original wires for stepper motors are too short so I decide to make a new one for myself , what kind crimp housing and terminal should I buy and where can I buy them ? I search online and only found people saying molex housing, but which model number is that ?
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Urgent Mendel90 Question (2 replies)

September 27, 2013, 5:39 am
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Hi everyone. Im busy sourcing parts for a mendel 90 and wanted to know... It specifies the motor length to be 47.5mm but would a shorter stepper also nema 17 as requested work?

Also, in the BOM it just says "Microswitch" I assume these are the endstops? which ones would work?

Best.
Andrico
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Some general motor questions (1 reply)

October 9, 2013, 12:37 pm
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Hey everyone, I'm new to the forum. I've been reading it for quite some time building my Prusa i2 and everything has worked out wonderfully. As an 18 year old engineering student I have neither time nor money but somehow it came together in three weeks!

Anyway, I spent some extra money on parts that I knew I would keep as I transition to my next build. I found all the parts for $350 but put in an extra $100 on the bits that I knew I may need later, such as motors. I'm already looking at upgrading a bit- I have CNC access so i'll be doing something similar to the i3, except i'll be scaling it up a bit to try to get a little more than a cubic foot of print volume. My plans also include a heated enclosure so I think I can pull it off. But we'll see.

ANYWAY, here are my questions. I think I know the theoretical answer to most just doing the math but I would like to know what actually goes on from experience. I spent the most extra cash on steppers to get 76oz/in or about 54N/cm. They run at 4.2 V and suck up 1.5 amps. My power supply can handle everything. I'm running RAMPS 1.4.
What will be my limiting factor concerning speed? I can run the default printerface/slic3r settings without the pololu's getting hot at all. I think I remember them being rated for 2 amps, and if I can get a fan blowing over them will they be able to run fast?

Also if i'm increasing speed a little bit every print, say by 25mm, how will I know when I've gone too fast? Will it be print quality or will something blow? I'd like to find my speed limit. Thanks so much everyone!
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Unidentified Japan Servo steppers (11 replies)

October 10, 2013, 10:44 am
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Hello, i just foud this two steppers which i can not find online as a product, i wonder if i could use them
as the plate says they are:
small one: 30 Ohm 2.6v 1.2A seems NEMA17 - Model: kh42jm2b247
big one: 5 Ohm - 1.76v - 2A - Model: kh56jm2u083

no info on toque, also i think the big one is very high on current usage


Picture: [tinypic.com]
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Berger Lahar RDM 599/50 5 phase motor and Berger Lahar D450.01 Driver (no replies)

October 10, 2013, 10:42 pm
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Hello Friends

I have a broken machine equiped with a Berger Lahar RDM 599/50 5 phase stepper motor and controled with a Berger Lahar driver D450.01.

Seems the driver is broken, but I do'nt have the manual, it has a red led always on.

I tested the motor and it seems good (3.5 ohms in each phase).

Can the forum help to repair or find a equal or equivalent driver for this kind of motor?

Do you suggest change this motor by a 4 phase one with a driver? Which motor and driver?

Do you have the characterisitcs of the old motor?

Best regards

CPalha
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Stepper Motors won't turn (2 replies)

October 25, 2013, 12:57 am
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So I build this Prusa Mendel I2 printer using the full kit from Charlie's 3d Technologies.
After assembly I really wanted to upload the firmware and simply make the printer move. Unfortunately it wasn't that simple.
I uploaded the Repetier firmware and tried to control my printer using Repetier host, but it didn't work. I only got the fan to blow and the heated bed and hot end to head up, but I could not move the motors. I tried to get them turning by adjusting the pot on the stepper drivers, but without positive result. Later I tried using Sprinter or Marlin, but still the same result. I also tried using Pronterface in stead of Repetier host, but still nothing.
I know there are a lot of people with the same problem, who posted their problems on the internet. I found a lot of solutions, but non of them worked for me. I've been searching the web for days and I can't find a working solution for my problem. I really hope somebody could help me.
Here is some information about my printer:
I am using Ramps 1.4, Nema 17 stepper motors and Pololu A4988 Stepper Motor Drivers. The power supply didn't come with the kit, so I use a old pc power supply, rated 12V max 15A. I tested the power supply on a cd drive, so I know it works. I am using an MK2a heated bed, two 100 ohms thermistors and mechanical end stops. All is connected.
To solve this problem I have tried to follow instructions on how to install the firmware and what adjustments to make in the configuration.h file, but no positive results. Therefor I do not think software is the problem. I also tried disconnecting the endstops and switching the stepper motor's wires, but still no changes. My motors are wired as follows:
2B blue
2A red
1A green
1B black
There is a connection inside the motors between the blue and the red wires and between the green and black wires.
When I tell one of motors to move, the X motor just lightly vibrates (you only feel this when your hand touches the motor) and the Z, Y and E motors don't react at all. When I press extrude in pronterface, it says 'echo: cold extrusion prevented'

I hope I gave you enough information to find me a solution, because I'm really desperate for one.

EDIT:
I forgot to mention I also tried the ramps test firmware, but that gives the same result.
Furthermore, I am Dutch, so my apologies for my crapy English.
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Can i use a servo on the extruder mechanism for a repstrap? (2 replies)

November 8, 2013, 5:18 pm
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Hi

I saw a lot stepper embed on the, but the task for this is just the ABS for melt, that´s the reason for my question replace the stepper by a servo. what do you think?
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Stepper selection - voltage confusion. (6 replies)

November 10, 2013, 8:00 am
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Im getting really confused about stepper motor selection.

I am building a new large printer using the ramps 1.4 and DRV8825 driver from a 12v supply.
I already have a mendelmax using this setup except with standard A4988 drivers and nema17s

It looks like both drivers use the main Ramps 1.4 voltage (12v) as the motor drive.
OK so far, except the nema17s supplied with the mendelmax kit are rated at 3.7v.
I guess that is what the pot power adjustment is all about, finding the right drive power?

Anyway I am trying to select a nema23 size for my new project and have the following choice.

Specifications:
Model No. Voltage Current (phase) Inductance (Phase) Holding
Torque
V A mH Nm
SY57STH51-1008B 9.24 0.7 32.8 1
SY57STH51-3008B 3.1 2.1 3.6 1
SY57STH56-2008B 5.04 1.4 10 1.24
SY57STH56-3008B 3.15 2.1 4.4 1.24
SY57STH76-3008B 4 2.1 6.4 1.85

I thought I was quite good with electronics running 3.7v motors from 12v seems a bit wacky.


(sorry cant get the table formatted properly)

Im thinking the lower one is the best choice.

Any advice welcome.
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Ok I think I made a mistake buying these (5 replies)

November 9, 2013, 4:03 pm
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Hello there
I wanted to build a repstrap... so ...with too much precipitation I bought those three unipolar (6 wires) Japanese 1,8° Mineabea stepper motors.

23KM-K036-18D shaft OD is 8mm ==>so this looks 36 volts (ok big mistake here)
23KM-K112-P3V shaft OD is 6mm ==> it seems to be 12v
23KM-K036-P10V shaft OD is 6mm==> yet another 36volts (oh my my my...)

My question : is there something to be done with all of this or is it better to end with this stupid money saving attemp and buying a reprap kit ?
thank you.
(forgive my english, I do my best but I remain a frog eater despite of all my tries)
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Which stepper to buy: 68oz 0.9degrees or 70oz 1.8degrees (12 replies)

November 9, 2013, 1:34 am
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I've been looking at 3d printing for a while now and finaly decided to take the leap and get into it (Can't wait!!!! :D :D ).

I'm looking at building the Rostock: [reprap.org]
The build platform isn't exactly large so I think I'll scale the build platform up from 200mm x 200mm to something around 350mm x 350mm. We'll see when we get there :)

I'm stuck on a buying decision: I don't know which motor to get.
Here's the ones I'm looking at getting:

#1 [www.sparkfun.com]

Step Angle (degrees) : 0.9
2-Phase
Rated Voltage: 3V
Rated Current: 1.7A/Phase
5mm Diameter Drive Shaft
Holding Torque: 48N.cm
NEMA 17 form factor

Pro's: its cheaper for me, as it will cost me $102NZD for 5 of them with free shipping. 0.9 degrees Its more precise 1.8 .
Con's : its 1.7 amps max, and I'll be using a 2amp driver so it could over heat? less torque. Will I need all that torque? I do plan to print fast :D

#2 this one: [www.trademe.co.nz]
5x Wantai motor Nema 17
Holding Torque: 4800g-cm(70oz-in)
Phase: 2 (4 wire)
Current / Phase: 2.5A

Pro's: More torque, more speed.
Con's its $145 for all 5 of them. Less resolution than option #1.


So the question is pretty much can I use motor #1 and will it be fine? Or do I need more torque?


Advice is much appreciated. :) :) :)
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New Project (5 replies)

November 10, 2013, 7:47 am
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I have a new brainstorm project that I would like to develop that involves stepper motors and possibly some optic tracking device and maybe some solenoids. Is there anyone out there willing to take me under their wing and give me an education on what i need and how to go about doing it? I have computer knowledge but not much knowledge of stepper motors and whats required to make them run and how to program and interface them.

Thanks,
Steve
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Extruder Stepper Not Working (1 reply)

November 10, 2013, 8:07 am
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Hey All,

I recently replaced my extruder head and it required a change in the extruder motor direction. So I swapped the wires for the stepper motor to change the polarity of a coil and now the extruder just jitters instead of working.

If I plug the extruder motor into the x-axis and jog it, it runs fine. Now I know that swapping wires on the stepper motors isn't supposed to be able to damage the board, but I think that in this case it has. Any ideas about how to work out what's blown? Is it the stepper driver?

Also note: the heatbed now powers on when I switch on the power supply and won't respond to temperature controls. Not sure if this is related but it was fine before I tried to reverse the stepper direction.
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