[chbot] Question regarding stepper motors

[Michael Dawson]

The meter measures 0.00 when I short the probes together, I didn't have a
4.7ohm resister, lowest I had was a 10ohm which the meter read as 10ohm.

Cheers

Michael

On Mon, 24 Feb 2020 at 16:04, Mark Atherton <markaren1 at xtra.co.nz> wrote:

> It's notoriously difficult to measure these kind of resistances using the
> two-wire method, so please double check before going any further.
>
> Do you have a 4.7 ohm resistor you can read using the same meter, just to
> verify test meter lead resistance
>
> or pass a known 200mA thorough the phase (with one meter on current in
> series), and measure voltage directly across the phase using a second meter.
>
> -----
>
> If you can't do either of the above, what resistance do you get when you
> short the meter's probes together ?
>
> slowly, slowly ...
>
> - Mark
>
>
>
>
> On 24/02/2020 2:42 PM, Michael Dawson wrote:
>
> OK Measuring 5.7 ohms through a phase.
>
> Does this suggest it's not a 1.33A?
>
> Cheers
> Michael
>
> On Mon, 24 Feb 2020 at 14:24, Mark Atherton <markaren1 at xtra.co.nz> wrote:
>
>> So, a bit like https://www.banggood.com/search/990669.html
>>
>> Looks like the standard length is 34mm, colours may be standard, and
>> weight is 220g. Allowing 12g for your gear, this all sounds very similar..
>>
>> Your part number is D42HSC1413B-24, so it looks like the D42 part could
>> be associated with faceplate size.
>>
>> googling "d42hsc" stepper motor indicates that d42hsc may be the family
>> of the part you are looking for.
>>
>> The DC resistance of the Bangood part above is 2.1ohms per phase.
>>
>> If you can measure low resistances with accuracy, see what your
>> resistance is for one phase. Or pass 200mA through a phase and measure volt
>> drop.
>>
>> -Mark
>>
>>
>>
>>
>>
>>
>> On 24/02/2020 1:32 PM, Michael Dawson wrote:
>>
>> 4 wires into a 6 wire plug, colours from left looking towards the motor,
>> black, space, red, green, space, blue.
>> Dimensions 42mm x 42mm Faceplate x 33mm depth of motor.
>> 232 grams weight including cog, can weight without that is that would
>> help.
>>
>> Cheers
>> Michael
>>
>> On Mon, 24 Feb 2020 at 13:06, Mark Atherton <markaren1 at xtra.co.nz> wrote:
>>
>>> Hi Michael,
>>>
>>> Welcome aboard.
>>>
>>> A few parameters which may be useful:
>>>
>>> - How many wires, what colours
>>>
>>> - Overall dimensions
>>>
>>> - Weight
>>>
>>> Regards, Mark
>>>
>>>
>>>
>>> On 24/02/2020 12:25 PM, Michael Dawson wrote:
>>> > I am trying to calibrate the A4988 drivers for the stepper motors for
>>> > my laser engraver/cutter, using Arduino Uno and the CNC shield,
>>> > (because the one that came with the cutter was pirated software and
>>> > didn't work how it was supposed to and I want to run laserGRBL anyway).
>>> >
>>> > The issue I am having is, I have not got the specs for the stepper
>>> > motors and aliexpress did not provide the specs.
>>> >
>>> > I think they are nema17, but the only hint I have to that is that when
>>> > I search on the number etched into the motors D42HSC141B-24 I find an
>>> > old banggood ad saying they are nema17 but if you click on the link
>>> > the original ad is long gone.
>>> >
>>> > I currently have them set to 0.952v when measured connected to the
>>> > arduino and cnc shield which is what was suggested, if they were rated
>>> > to 1.7A. I'm hoping that is correct for these steppers, so I guess my
>>> > question is does anybody have these same steppers and know the specs,
>>> > or do they know it they are indeed rated to 1.7A
>>> >
>>> > Or is there a way to find the Amp rating other than the etching on the
>>> > side of the stepper?
>>> >
>>> > Any help would be much appreciated.
>>> >
>>> > Oh hi BTW, my name is Michael, one or two of you may know me, I ran
>>> > Red Dwarf BBS back in the day, (I just remembered, I had the Red Dwarf
>>> > logo display in RIP script when you logged in, pity that never really
>>> > took off.)
>>> >
>>> > Michael
>>
>>
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