[Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz August 09, 2012 09:44AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz August 10, 2012 04:35AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz August 10, 2012 05:47AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz August 10, 2012 08:33AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz August 10, 2012 09:51AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz September 23, 2012 03:40AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz November 06, 2012 07:34PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz November 14, 2012 11:49AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 11, 2013 01:40PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 11, 2013 02:24PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 19, 2013 03:52PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 19, 2013 06:57PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 19, 2013 07:06PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 19, 2013 08:50PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 03:59AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 04:05AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 04:30AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 06:33AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 04:06PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz February 20, 2013 04:33PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 10, 2014 12:55PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 10, 2014 02:47PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 10, 2014 05:30PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 10, 2014 07:24PM |
Admin Registered: 15 years ago Posts: 1,470 |
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.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
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 11, 2014 02:13AM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 11, 2014 05:58PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 11, 2014 06:01PM |
Admin Registered: 15 years ago Posts: 1,470 |
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.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.
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 11, 2014 06:10PM |
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Re: [Taiwan] little geared stepper motor, 1:50, 7ohm, 12V, 0.4Amps, 147Oz March 12, 2014 04:13PM |
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