Received: by 10.205.126.4 with SMTP id gu4mr139687bkc.8.1345123245114;
        Thu, 16 Aug 2012 06:20:45 -0700 (PDT)
X-BeenThere: thingiverse@googlegroups.com
Received: by 10.204.7.213 with SMTP id e21ls1951743bke.2.gmail; Thu, 16 Aug
 2012 06:20:43 -0700 (PDT)
Received: by 10.205.139.2 with SMTP id iu2mr139518bkc.7.1345123243799;
        Thu, 16 Aug 2012 06:20:43 -0700 (PDT)
Received: by 10.205.139.2 with SMTP id iu2mr139517bkc.7.1345123243736;
        Thu, 16 Aug 2012 06:20:43 -0700 (PDT)
Return-Path: <triffid.hun...@gmail.com>
Received: from mail-lpp01m010-f47.google.com (mail-lpp01m010-f47.google.com [209.85.215.47])
        by gmr-mx.google.com with ESMTPS id k7si1047600bks.2.2012.08.16.06.20.43
        (version=TLSv1/SSLv3 cipher=OTHER);
        Thu, 16 Aug 2012 06:20:43 -0700 (PDT)
Received-SPF: pass (google.com: domain of triffid.hun...@gmail.com designates 209.85.215.47 as permitted sender) client-ip=209.85.215.47;
Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of triffid.hun...@gmail.com designates 209.85.215.47 as permitted sender) smtp.mail=triffid.hun...@gmail.com; dkim=pass header...@gmail.com
Received: by lagv3 with SMTP id v3so1444047lag.20
        for <thingiverse@googlegroups.com>; Thu, 16 Aug 2012 06:20:43 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type;
        bh=0gsaXNhBPWMESvmWO3r+Mr5ObR4ItnGKlmbhH766bmY=;
        b=gzTsaCv2dxeyTOYVFy7ZlSax/S4SioBlV4iO7OnAZV7DAVtZnfKbRLa6wWpgJlBkcp
         4/AnqiTkMsjrpkUbL2z7v+0x1u7xixrU0yxlI+DYmeUCFoOq8ewJPkFYwnMt0JGa7k7I
         GjJvKLvtTqQ824S36XJblCUIbd4zWpnmcRgx3Z0sLZsB/v/5d0UFkjS7h1eHnqCrbKZS
         uRwdRB+DDZiOVtB69GPJLuQL/Xr3lE33uMAa9bkl5rnONRY6+rcg1HkoowRcqu0EO82S
         82+bBiAuhZp5Dda51KX6fz5nLZHNBTyrGbBs6WUpvIXjGG3B18Q3x8dmEcd4koJaNgnf
         wJFQ==
Received: by 10.152.144.168 with SMTP id sn8mr1320069lab.1.1345123243311; Thu,
 16 Aug 2012 06:20:43 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.114.38.101 with HTTP; Thu, 16 Aug 2012 06:20:23 -0700 (PDT)
In-Reply-To: <64d3fba0-e8cc-4e94-bdf8-269631cc12cd@googlegroups.com>
References: <64d3fba0-e8cc-4e94-bdf8-269631cc12cd@googlegroups.com>
From: Triffid Hunter <triffid.hun...@gmail.com>
Date: Thu, 16 Aug 2012 23:20:23 +1000
Message-ID: <CACL3eKDastRucKP+ASXnMUQrxKXxOvU=uiEsafj48Qn8U_d...@mail.gmail.com>
Subject: Re: [thingiverse] Does anyone know the spec of NEMA 17 Stepper Motor
 used for makerbot?
To: thingiverse@googlegroups.com
Content-Type: text/plain; charset=ISO-8859-1

On Thu, Aug 16, 2012 at 5:36 PM, George Zhang <gzh...@asianops.com> wrote:
> Does anyone know the spec of NEMA 17 Stepper Motor used for makerbot? Such
> as voltage, current and torque etc.

Not sure about makerbots, but over in reprap-land we need 200 step/rev
(0.9 degree) motors that take ~1.5A, have a low voltage rating (1-3
volts) and as much torque as possible- 40N.cm or more.

The low voltage rating is necessary so that our smart current-mode
A4988 driver chips have plenty of voltage headroom to maintain current
at speed.

I've heard that makerbot are now using something very similar to the
A4988 breakout (commonly referred to as "pololus" in reprap-land) so
I'd expect similar specced motors to work well with recent makerbot
electronics.