X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=xrc7MiZbMkWfklzdSPODiPhgxKM9iPxb2B4BfQeDASo=; b=R6sAMmSfMHW8SLcLnSdQTcvCISncQqAockEwyrofer0VYwopZKJ0OZa+k0ELWWhhKl ufiHJDFLhOaDFnhRj6BJqCq+sMNP2LNMgc9pNriQaOTDbVeL9xV5rG97JYsQAhu7/M0L NuZoEPj6Y2se7xownQhuM/pT6FJwjV2sbdTDK6vssomIBDNKmh0eTCxa8DognwZKqThV izkyVY8X8dnTe9N0vl3yO2SmBSiUN6ERph9PQ9Mfxwx8ZaR5u75FpRJDrds7aj5Zwsp2 AWuH003Bein4GyUoKSUMYbNsvzR5PXaaKdSxIK9iWS+3iXrYq0Pdx8Lg5YcUGlMPzPOw LGPg== MIME-Version: 1.0 X-Received: by 10.220.103.136 with SMTP id k8mr1926719vco.14.1418980342760; Fri, 19 Dec 2014 01:12:22 -0800 (PST) In-Reply-To: References: <1202520334 DOT 584160 DOT 1418936264033 DOT JavaMail DOT yahoo AT jws100190 DOT mail DOT ne1 DOT yahoo DOT com> <549342D9 DOT 4030008 AT neurotica DOT com> Date: Fri, 19 Dec 2014 04:12:22 -0500 Message-ID: Subject: Re: [geda-user] Nema 23 stepper motors From: Rob Butts To: geda-user AT delorie DOT com Content-Type: multipart/alternative; boundary=047d7b342d94460df1050a8e1b22 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --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 wrote: > On Fri, Dec 19, 2014 at 8:10 AM, Dave McGuire > 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

Thanks guys!

Four months in the hospital and coding twice left me a little fuzzy on t= he 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 <mj= d+geda-user AT hackvana DOT com> wrote:

On Fri, Dec 19, 2014 at 8:10 AM, Dave McGuire <mcguire AT neurotica DOT com> wrote:
>
>=C2=A0 =C2=A0I was about to suggest the same thing.=C2=A0 Real stepper = controller ICs
> have been around for 40+ years; it has really never been a good idea t= o
> bit-bang it with a processor.=C2=A0 Today's stepper controller chi= ps are
> very, very impressive.

Indeed.=C2=A0 They do stuff so you don't have to.

Avayan has a great series of articles about the TI88xx range of
stepper chips.=C2=A0 Here's one which covers the differences across the=
range, and why you'd choose one model over another:

=C2=A0 http://ebldc= .com/?p=3D355

Here's an amusing two-part "interview" with the TI8833:

=C2=A0 http://ebldc= .com/?p=3D264
=C2=A0 http://ebldc= .com/?p=3D271

If you'd rather watch a video:

=C2=A0 https://www.youtube.com/watch?v=3DF2sbq4ZYhwA

One big takeaway from that video is hearing the difference in noise
between microstepping and no microstepping.=C2=A0 Notice how incredibly
loud it is when microstepping is disabled.=C2=A0 If you're trying to dr= ive
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.=C2=A0 Plus you don't have all the regulation and protec= tion
features.=C2=A0 Use a chip!

Mitch.

--047d7b342d94460df1050a8e1b22--