[Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz Little geared stepper motor that will work as direct drive for extruder. 1 pcs $15, Buy link http://www.2engineers.com/shop/motor-1/ to see the direct drive motor in action click this link http://www.youtube.com/watch?v=NYF8tm0hxXo&feature=g-upl Here are the specs of this little motor. Phase 4/2 Step Angle 7.5 degrees Voltage 12V Drive Mode 4-2 unipolar Current 0.4A/Phase Resistance 7 +/- 10% ohm/phase Pull in torque 100N.cm min(100PPS) Insultaion Class E Best Regards, 2engineers https://reprap.org/forum/read.php?94,147175,147175#msg-147175 Sun, 11 Oct 2026 23:01:52 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?94,147175,323866#msg-323866 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,323866#msg-323866
Thanks for your info, i've never made those calculations :)

what i did was just put in the motor and test hours on hours..
if your interested checkout this youtube clip

http://www.youtube.com/watch?v=NYF8tm0hxXo

running pretty good speeds :)

cheers,
hp]]> hp_ For Sale Wed, 12 Mar 2014 16:13:18 -0400 https://reprap.org/forum/read.php?94,147175,323378#msg-323378 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,323378#msg-323378 andin For Sale Tue, 11 Mar 2014 18:10:55 -0400 https://reprap.org/forum/read.php?94,147175,323374#msg-323374 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,323374#msg-323374
Quote
hp_
be-aware, the 45mm/sec in the configuration file is a suggested configuration. where the max_feedrate is set to 45 mm/sec was working pretty well for me, the thing to take notice of is the acceleration and E_JERK.
with these geared motors you have to reduce the acceleration.
Something must be limiting top speed then. Probably the max step frequency of your firmware and a 16MHz Arduino. You are using 1,100steps/mm for the extruder, which is appropriate for a 11mm diameter drive gear and 16x microstepping. Max step frequency of Marlin on a 16MHz Arduino is ~16kHz (AFAIK; it may be even less than this. I can't find any recent documentation of the actual max step frequency for Marlin). 16,000steps/s divided by 1,100steps/mm gives a max feedrate of ~14.5mm/s, or 25 RPM of the output, or 1250 RPM of the stepper motor.

I would guess that if you reduced microstepping on the extruder to 8x or even 4x so that the firmware would be able to step it at a higher speed, that you would find the extruder motor skipping steps as it tried to keep up.

On a side note: As I do more research and calculations, I believe this issue applies to the standard geared extruders in use on most RepRaps. A standard Wade's-type geared extruder at 16x microstepping is usually around 1000steps/mm as well, meaning the max feed rate would be firmware/processing limited rather than mechanically limited. However, since the gearing is less severe, the max feed rate wouldn't be limited by stepper RPM to nearly the same level. I will have to do some testing. 45mm/s may very well not be actually achievable with a standard Wade's-type geared extruder either.]]> NewPerfection For Sale Tue, 11 Mar 2014 18:01:56 -0400 https://reprap.org/forum/read.php?94,147175,323370#msg-323370 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,323370#msg-323370 well if you suggest a value of 45mm/s, than it needs be technically plausible. The fact that it is working for you may indicate that your other settings (slicer speeds, feedrate for X/Y, etc.) never allow this value to be reached.

I have set the acceleration and jerk as you suggested on your website - no problem with that. What we are talking about here is the maximum feedrate of about ~10mm/s, as it was well pointed out by Cameron above. This yields an absolute theretical maximum printing speed of around 10*(1.75/0.35)²=250mm/s (1.75mm filament and 0.35mm nozzle) - which is e.g. lower than what has been achieved on an ultimaker (claimed to even go beyond 300mm/s). I guess the real maximum speed will be lower due to the decline in the stepper torque at higher extrusion rates. This is an important limitation which should be documented... 45mm/s is very misleading.

PS: If you have the phase inductance of these steppers, it is not difficult to estimate the maximum RPM using the time constant (simplified calculation w/o moment of inertia, etc.).]]> andin For Sale Tue, 11 Mar 2014 17:58:32 -0400 https://reprap.org/forum/read.php?94,147175,322962#msg-322962 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,322962#msg-322962
the direct link to the motors have changed to:
http://www.2engineers.com/shop/geared150/

be-aware, the 45mm/sec in the configuration file is a suggested configuration. where the max_feedrate is set to 45 mm/sec was working pretty well for me, the thing to take notice of is the acceleration and E_JERK.
with these geared motors you have to reduce the acceleration.

cheers,
hp_]]> hp_ For Sale Tue, 11 Mar 2014 02:13:45 -0400 https://reprap.org/forum/read.php?94,147175,322892#msg-322892 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,322892#msg-322892
Quote
andin
Hi,

I had some of these motors lying around so I tested them.

Unfortunately, the shaft of these motors cannot turn faster than around 18RPM = ~280mm/min = ~4.7 mm/sec. I have tested this for different current levels and different step-rates - same result. How come the vendor's website (2engineers 1:50 geared stepper) suggests a MAX_FEEDRATE of 45 mm/sec ?? This would imply over 80RPM (e.g. for an MK7 drive gear)!!!

I hope someone can explain where the error is :)
Most steppers have trouble getting above 1000 RPM using Pololu drivers and 12V (maybe 7.5 degree motors can go a bit faster?). Geared 1:50, this would give an output speed of 20 RPM, so your finding of 18 RPM max seems reasonable. An MK7 gear has ~10.5mm diameter, giving a ~33mm circumference. At 20 RPM, this is ~660mm/min or ~11mm/s (~10mm/s with 18 RPM). I could see them claiming ~10mm/s max speed, but I don't see how you could possibly get 45mm/s out of it.]]> NewPerfection For Sale Mon, 10 Mar 2014 19:24:32 -0400 https://reprap.org/forum/read.php?94,147175,322831#msg-322831 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,322831#msg-322831
Nevertheless, I wonder why the suggested firmware speed setting is so much higher compared to what the motor can actually handle. So I was wondering if I had overseen something...]]> andin For Sale Mon, 10 Mar 2014 17:30:20 -0400 https://reprap.org/forum/read.php?94,147175,322763#msg-322763 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,322763#msg-322763
No idea what the maximum achievable speed on these motors is though.]]> misan For Sale Mon, 10 Mar 2014 14:47:42 -0400 https://reprap.org/forum/read.php?94,147175,322712#msg-322712 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,322712#msg-322712
I had some of these motors lying around so I tested them.

Unfortunately, the shaft of these motors cannot turn faster than around 18RPM = ~280mm/min = ~4.7 mm/sec. I have tested this for different current levels and different step-rates - same result. How come the vendor's website (2engineers 1:50 geared stepper) suggests a MAX_FEEDRATE of 45 mm/sec ?? This would imply over 80RPM (e.g. for an MK7 drive gear)!!!

I hope someone can explain where the error is :)]]> andin For Sale Mon, 10 Mar 2014 12:55:58 -0400 https://reprap.org/forum/read.php?94,147175,186306#msg-186306 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186306#msg-186306
Having such a low resistance means that if you apply 12V to the coil the motor will heat up quite a lot, but using a current-switching driver like Allegro's or TI's will keep the current to the desired value without a problem. Still, I guess nophead is right and this motor nominal voltage is not 12V.

Which by the way is actually good news as you always want your motor nominal voltage to be several times lower than your power supply voltage so the switched-current drive can do its work properly.]]> misan For Sale Wed, 20 Feb 2013 16:33:53 -0500 https://reprap.org/forum/read.php?94,147175,186298#msg-186298 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186298#msg-186298 Wired1 For Sale Wed, 20 Feb 2013 16:06:01 -0500 https://reprap.org/forum/read.php?94,147175,186167#msg-186167 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186167#msg-186167
[www.baolai-cn.com]]]> misan For Sale Wed, 20 Feb 2013 06:33:58 -0500 https://reprap.org/forum/read.php?94,147175,186135#msg-186135 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186135#msg-186135 nophead For Sale Wed, 20 Feb 2013 04:30:37 -0500 https://reprap.org/forum/read.php?94,147175,186129#msg-186129 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186129#msg-186129
What I have done is to adjust my Pololu to 160mV so it delivers 0.4A to the motor winding. This way the motor hardly gets warm.]]> misan For Sale Wed, 20 Feb 2013 04:05:21 -0500 https://reprap.org/forum/read.php?94,147175,186128#msg-186128 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186128#msg-186128
U = volts
I = amperage
R = Ohms

U = I . R
12/7 = I

I = 1.7 A

in the next post i need to change this :)

hp]]> hp_ For Sale Wed, 20 Feb 2013 03:59:03 -0500 https://reprap.org/forum/read.php?94,147175,186074#msg-186074 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186074#msg-186074 nophead For Sale Tue, 19 Feb 2013 20:50:26 -0500 https://reprap.org/forum/read.php?94,147175,186059#msg-186059 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186059#msg-186059 www.ebay.com] which starts not going ok if you go faster than 40mm/s and I am using 3mm filament and 0.5mm nozzle.

And this extruder (on a Prusa i3) [github.com]]]> misan For Sale Tue, 19 Feb 2013 19:06:06 -0500 https://reprap.org/forum/read.php?94,147175,186057#msg-186057 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186057#msg-186057 Wired1 For Sale Tue, 19 Feb 2013 18:57:54 -0500 https://reprap.org/forum/read.php?94,147175,186006#msg-186006 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,186006#msg-186006
And hp_ has been very helpful while I was setting it up. What not to like? :-)]]> misan For Sale Tue, 19 Feb 2013 15:52:04 -0500 https://reprap.org/forum/read.php?94,147175,183883#msg-183883 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,183883#msg-183883 Wired1 For Sale Mon, 11 Feb 2013 14:24:11 -0500 https://reprap.org/forum/read.php?94,147175,183867#msg-183867 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,183867#msg-183867
http://www.2engineers.com/shop/geared150/

this time shipping from Belgium.

Cheers,
HP]]> hp_ For Sale Mon, 11 Feb 2013 13:40:27 -0500 https://reprap.org/forum/read.php?94,147175,166107#msg-166107 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,166107#msg-166107 Prober For Sale Wed, 14 Nov 2012 11:49:56 -0500 https://reprap.org/forum/read.php?94,147175,164707#msg-164707 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,164707#msg-164707 Wired1 For Sale Tue, 06 Nov 2012 19:34:24 -0500 https://reprap.org/forum/read.php?94,147175,156086#msg-156086 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,156086#msg-156086
Cheers,
Hp_]]> hp_ For Sale Sun, 23 Sep 2012 03:40:14 -0400 https://reprap.org/forum/read.php?94,147175,147421#msg-147421 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,147421#msg-147421
check out this filmclip where blddk is using same type of motor. only different with that motor was it had 30 ohms resistance. and it would get to hot.

i've ask the manufacterer to make me the same motor but with 7ohms

[www.flickr.com]

hp_]]> hp_ For Sale Fri, 10 Aug 2012 09:51:46 -0400 https://reprap.org/forum/read.php?94,147175,147397#msg-147397 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,147397#msg-147397 nophead For Sale Fri, 10 Aug 2012 08:33:32 -0400 https://reprap.org/forum/read.php?94,147175,147362#msg-147362 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,147362#msg-147362
it should be Reduction ratio..

I was jus reading this wiki: [en.wikipedia.org]

I have been testing several motors with different gearboxes.. one is a 97Oz - 1:30 Geared motor
the other is the 1:50 147Oz Geared Motor

The 1:50 (147Oz) geared motor gave me the best test result so far.

hp_]]> hp_ For Sale Fri, 10 Aug 2012 05:47:48 -0400 https://reprap.org/forum/read.php?94,147175,147352#msg-147352 Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,147352#msg-147352 nophead For Sale Fri, 10 Aug 2012 04:35:38 -0400 https://reprap.org/forum/read.php?94,147175,147175#msg-147175 [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz https://reprap.org/forum/read.php?94,147175,147175#msg-147175
1 pcs $15, Buy link http://www.2engineers.com/shop/motor-1/

to see the direct drive motor in action click this link http://www.youtube.com/watch?v=NYF8tm0hxXo&feature=g-upl

Here are the specs of this little motor.
Phase 4/2
Step Angle 7.5 degrees
Voltage 12V
Drive Mode 4-2 unipolar
Current 0.4A/Phase
Resistance 7 +/- 10% ohm/phase
Pull in torque 100N.cm min(100PPS)
Insultaion Class E


Best Regards,
2engineers]]> hp_ For Sale Thu, 09 Aug 2012 09:44:52 -0400