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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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--047d7b342d94460df1050a8e1b22 Content-Type: text/plain; charset=UTF-8 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. > --047d7b342d94460df1050a8e1b22 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <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've using and its datasheet so= I'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"><<a href=3D"mailto:mjd+geda-user AT hackvana DOT com" target=3D"_blank">mj= d+geda-user AT hackvana DOT com</a>></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 <<a href=3D"ma= ilto:mcguire AT neurotica DOT com">mcguire AT neurotica DOT com</a>> wrote:<br> ><br> >=C2=A0 =C2=A0I was about to suggest the same thing.=C2=A0 Real stepper = controller ICs<br> > have been around for 40+ years; it has really never been a good idea t= o<br> > bit-bang it with a processor.=C2=A0 Today's stepper controller chi= ps are<br> > very, very impressive.<br> <br> </span>Indeed.=C2=A0 They do stuff so you don't have to.<br> <br> Avayan has a great series of articles about the TI88xx range of<br> stepper chips.=C2=A0 Here's one which covers the differences across the= <br> range, and why you'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's an amusing two-part "interview" 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'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're trying to dr= ive<br> H-bridges yourself, the result you'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'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> --047d7b342d94460df1050a8e1b22--
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