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Date:	Fri, 19 Dec 2014 04:12:22 -0500
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Subject:	Re: [geda-user] Nema 23 stepper motors
From:	Rob Butts <r DOT butts2 AT gmail DOT com>
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Thanks guys!

Four months in the hospital and coding twice left me a little fuzzy on the
design ~ pneumonia can be a real bastard

I found the stepper motor controller i've using and its datasheet so I'm
all set

On Thu, Dec 18, 2014 at 6:21 PM, Mitch Davis <mjd+geda-user AT hackvana DOT com>
wrote:

> On Fri, Dec 19, 2014 at 8:10 AM, Dave McGuire <mcguire AT neurotica DOT com>
> wrote:
> >
> >   I was about to suggest the same thing.  Real stepper controller ICs
> > have been around for 40+ years; it has really never been a good idea to
> > bit-bang it with a processor.  Today's stepper controller chips are
> > very, very impressive.
>
> Indeed.  They do stuff so you don't have to.
>
> Avayan has a great series of articles about the TI88xx range of
> stepper chips.  Here's one which covers the differences across the
> range, and why you'd choose one model over another:
>
>   http://ebldc.com/?p=355
>
> Here's an amusing two-part "interview" with the TI8833:
>
>   http://ebldc.com/?p=264
>   http://ebldc.com/?p=271
>
> If you'd rather watch a video:
>
>   https://www.youtube.com/watch?v=F2sbq4ZYhwA
>
> One big takeaway from that video is hearing the difference in noise
> between microstepping and no microstepping.  Notice how incredibly
> loud it is when microstepping is disabled.  If you're trying to drive
> H-bridges yourself, the result you're going to get is only ever going
> to be as good as that incredibly noisy non-microstepped mode, and
> possibly worse.  Plus you don't have all the regulation and protection
> features.  Use a chip!
>
> Mitch.
>

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<div dir=3D"ltr"><font><p>Thanks guys!</p>

<p>Four months in the hospital and coding twice left me a little fuzzy on t=
he design ~ pneumonia can be a real bastard</p>

<p>I found the stepper motor controller i&#39;ve using and its datasheet so=
 I&#39;m all set</p></font></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Thu, Dec 18, 2014 at 6:21 PM, Mitch Davis <span dir=3D"=
ltr">&lt;<a href=3D"mailto:mjd+geda-user AT hackvana DOT com" target=3D"_blank">mj=
d+geda-user AT hackvana DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><span>On Fri, Dec 19, 2014 at 8:10 AM, Dave McGuire &lt;<a href=3D"ma=
ilto:mcguire AT neurotica DOT com">mcguire AT neurotica DOT com</a>&gt; wrote:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0I was about to suggest the same thing.=C2=A0 Real stepper =
controller ICs<br>
&gt; have been around for 40+ years; it has really never been a good idea t=
o<br>
&gt; bit-bang it with a processor.=C2=A0 Today&#39;s stepper controller chi=
ps are<br>
&gt; very, very impressive.<br>
<br>
</span>Indeed.=C2=A0 They do stuff so you don&#39;t have to.<br>
<br>
Avayan has a great series of articles about the TI88xx range of<br>
stepper chips.=C2=A0 Here&#39;s one which covers the differences across the=
<br>
range, and why you&#39;d choose one model over another:<br>
<br>
=C2=A0 <a href=3D"http://ebldc.com/?p=3D355" target=3D"_blank">http://ebldc=
.com/?p=3D355</a><br>
<br>
Here&#39;s an amusing two-part &quot;interview&quot; with the TI8833:<br>
<br>
=C2=A0 <a href=3D"http://ebldc.com/?p=3D264" target=3D"_blank">http://ebldc=
.com/?p=3D264</a><br>
=C2=A0 <a href=3D"http://ebldc.com/?p=3D271" target=3D"_blank">http://ebldc=
.com/?p=3D271</a><br>
<br>
If you&#39;d rather watch a video:<br>
<br>
=C2=A0 <a href=3D"https://www.youtube.com/watch?v=3DF2sbq4ZYhwA" target=3D"=
_blank">https://www.youtube.com/watch?v=3DF2sbq4ZYhwA</a><br>
<br>
One big takeaway from that video is hearing the difference in noise<br>
between microstepping and no microstepping.=C2=A0 Notice how incredibly<br>
loud it is when microstepping is disabled.=C2=A0 If you&#39;re trying to dr=
ive<br>
H-bridges yourself, the result you&#39;re going to get is only ever going<b=
r>
to be as good as that incredibly noisy non-microstepped mode, and<br>
possibly worse.=C2=A0 Plus you don&#39;t have all the regulation and protec=
tion<br>
features.=C2=A0 Use a chip!<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Mitch.<br>
</font></span></blockquote></div><br></div>

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