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<div class="moz-cite-prefix">Good enough, I would say that your
phase resistance is probably quite close to 5.7 ohms.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">So next step is to find a stepper with
similar weight, dims, and resistance and take associated
electrical parameters as a starting point - maybe the bangood
part.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Assume that any given volume of stepper
can dissipate similar power. Work out what that might be for the
bangood unit, then recalculate forward using 5.7 ohms to find
current etc.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">-mark<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 24/02/2020 4:37 PM, Michael Dawson
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABGCvpYZm+Qrr_QfwV2g=ONcFYEdGPLCSWgvt8DDwN1j_a-eJw@mail.gmail.com">
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<div dir="ltr">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.
<div><br>
</div>
<div>Cheers</div>
<div><br>
</div>
<div>Michael</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, 24 Feb 2020 at 16:04,
Mark Atherton <<a href="mailto:markaren1@xtra.co.nz"
moz-do-not-send="true">markaren1@xtra.co.nz</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<div>It's notoriously difficult to measure these kind of
resistances using the two-wire method, so please double
check before going any further.</div>
<div><br>
</div>
<div>Do you have a 4.7 ohm resistor you can read using the
same meter, just to verify test meter lead resistance</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>-----</div>
<div><br>
</div>
<div>If you can't do either of the above, what resistance do
you get when you short the meter's probes together ?<br>
</div>
<div><br>
</div>
<div>slowly, slowly ...</div>
<div><br>
</div>
<div>- Mark<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>On 24/02/2020 2:42 PM, Michael Dawson wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">OK Measuring 5.7 ohms through a phase.<br>
<br>
<div>Does this suggest it's not a 1.33A?</div>
<div><br>
</div>
<div>Cheers</div>
<div>Michael</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, 24 Feb 2020 at
14:24, Mark Atherton <<a
href="mailto:markaren1@xtra.co.nz" target="_blank"
moz-do-not-send="true">markaren1@xtra.co.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<div>So, a bit like <a
href="https://www.banggood.com/search/990669.html"
target="_blank" moz-do-not-send="true">https://www.banggood.com/search/990669.html<br>
</a></div>
<div><br>
</div>
<div>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..</div>
<div><br>
</div>
Your part number is D42HSC1413B-24, so it looks like
the D42 part could be associated with faceplate
size.
<div><br>
</div>
<div>googling "d42hsc" stepper motor indicates that
d42hsc may be the family of the part you are
looking for.</div>
<div>
<div><br>
</div>
<div>The DC resistance of the Bangood part above
is 2.1ohms per phase.<br>
</div>
<div><br>
</div>
</div>
<div>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.</div>
<div><br>
</div>
<div>-Mark<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<br>
<div><br>
</div>
<div><br>
</div>
<div>On 24/02/2020 1:32 PM, Michael Dawson wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>4 wires into a 6 wire plug, colours from
left looking towards the motor, black, space,
red, green, space, blue.<br>
Dimensions 42mm x 42mm Faceplate x 33mm depth
of motor.</div>
<div>232 grams weight including cog, can weight
without that is that would help.<br>
</div>
<div><br>
</div>
<div>Cheers</div>
<div>Michael</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, 24 Feb
2020 at 13:06, Mark Atherton <<a
href="mailto:markaren1@xtra.co.nz"
target="_blank" moz-do-not-send="true">markaren1@xtra.co.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hi Michael,<br>
<br>
Welcome aboard.<br>
<br>
A few parameters which may be useful:<br>
<br>
- How many wires, what colours<br>
<br>
- Overall dimensions<br>
<br>
- Weight<br>
<br>
Regards, Mark<br>
<br>
<br>
<br>
On 24/02/2020 12:25 PM, Michael Dawson wrote:<br>
> I am trying to calibrate the A4988
drivers for the stepper motors for <br>
> my laser engraver/cutter, using Arduino
Uno and the CNC shield, <br>
> (because the one that came with the
cutter was pirated software and <br>
> didn't work how it was supposed to and I
want to run laserGRBL anyway).<br>
><br>
> The issue I am having is, I have not got
the specs for the stepper <br>
> motors and aliexpress did not provide the
specs.<br>
><br>
> I think they are nema17, but the only
hint I have to that is that when <br>
> I search on the number etched into the
motors D42HSC141B-24 I find an <br>
> old banggood ad saying they are nema17
but if you click on the link <br>
> the original ad is long gone.<br>
><br>
> I currently have them set to 0.952v when
measured connected to the <br>
> arduino and cnc shield which is what was
suggested, if they were rated <br>
> to 1.7A. I'm hoping that is correct for
these steppers, so I guess my <br>
> question is does anybody have these same
steppers and know the specs, <br>
> or do they know it they are indeed rated
to 1.7A<br>
><br>
> Or is there a way to find the Amp rating
other than the etching on the <br>
> side of the stepper?<br>
><br>
> Any help would be much appreciated.<br>
><br>
> Oh hi BTW, my name is Michael, one or two
of you may know me, I ran <br>
> Red Dwarf BBS back in the day, (I just
remembered, I had the Red Dwarf <br>
> logo display in RIP script when you
logged in, pity that never really <br>
> took off.)<br>
><br>
> Michael</blockquote>
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