delorie.com/archives/browse.cgi   search  
Mail Archives: geda-user/2014/01/22/15:14:00

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=APu5m6ywCxTF3ZLxZCBiRA6HI2U9zcbUPdNzJU3UcNU=;
b=X0h4I6uLYuAkR4OW4nhOOQxYC4CNjMtBoPn9WtUYMawLPmlq8RusLCbBC/FgeePBZo
sH7wZsUsIZQDICvaQt94AWXq/1Aa5L4EWIHbwh/olQLInpv7GFigQmdApsM2KWGfxQ8o
ZmJIyB9N2lOJRmA0vbpY9W+SpfkUYSqO/ufTsw4YDXNil2JQhnWmswLNwTnnMt8Sh59s
OsNFbvpYwf0HyC7otLhiNhm5i6OL6joM4BEQw3wmSCi5YLVI1JXDAmMgnABRr6W25C91
ddszWOXbc2ncqDo0/XeB787I0PuqNLt137qmneoJhnTillx9mRhIbTWi5HFE8eOoFo3b
3FvA==
MIME-Version: 1.0
X-Received: by 10.180.105.65 with SMTP id gk1mr21889258wib.12.1390421615433;
Wed, 22 Jan 2014 12:13:35 -0800 (PST)
In-Reply-To: <CALSZ9gp+idKpy7gfgsUXry0tnQ--bSLjkSURMiNPEzXids8o8g@mail.gmail.com>
References: <CALSZ9gp+idKpy7gfgsUXry0tnQ--bSLjkSURMiNPEzXids8o8g AT mail DOT gmail DOT com>
Date: Wed, 22 Jan 2014 15:13:35 -0500
Message-ID: <CACPio-6AquQDoMBxwOFTWdxdhQCe0OZWwzu5EvmcWFu4sqOZyg@mail.gmail.com>
Subject: Re: [geda-user] Best way to measure RPMs
From: Nathan Stewart <therealnathanstewart AT gmail DOT com>
To: "geda-user AT delorie DOT com" <geda-user AT delorie DOT com>
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

--f46d0442708c79e4b004f094c2f1
Content-Type: text/plain; charset=ISO-8859-1

That depends a lot on whats attached to the shaft, how fast it's turning,
and what's driving it.  Obvious solutions are encoder, interrupter (photo
or magnetic - ic engines typically use an inductive pickup on gear teeth),
or even counting pulses on the drive current. If you already have an
encoder for other purposes, that makes a lot of sense. If you don't already
have anything else that might work, interrupter and divide by is probably
the most direct method. Sensing the driving forces can be a lot of things,
from stepper motor pulses to spark plug firing.

What's the application?




On Wed, Jan 22, 2014 at 3:00 PM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:

> I have a shaft that I want to measure the rpm of.  I'm looking for
> opinions on the best and cheapest way.  The design is still in development
> phase so I have freedom.
>
> Thanks
>

--f46d0442708c79e4b004f094c2f1
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>That depends a lot on whats attached to the shaft, ho=
w fast it&#39;s turning, and what&#39;s driving it.=A0 Obvious solutions ar=
e encoder, interrupter (photo or magnetic - ic engines typically use an ind=
uctive pickup on gear teeth), or even counting pulses on the drive current.=
 If you already have an encoder for other purposes, that makes a lot of sen=
se. If you don&#39;t already have anything else that might work, interrupte=
r and divide by is probably the most direct method. Sensing the driving for=
ces can be a lot of things,=A0 from stepper motor pulses to spark plug firi=
ng. <br>
<br></div><div>What&#39;s the application?<br></div><div><br></div><br></di=
v><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, Jan=
 22, 2014 at 3:00 PM, Rob Butts <span dir=3D"ltr">&lt;<a href=3D"mailto:r.b=
utts2 AT gmail DOT com" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>&gt;</span> wrote:=
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>I have a shaft that I =
want to measure the rpm of.=A0 I&#39;m looking for opinions on the best and=
 cheapest way.=A0 The design is still in development phase so I have freedo=
m.</div>
<div>=A0</div><div>Thanks</div>
</div>
</blockquote></div><br></div>

--f46d0442708c79e4b004f094c2f1--

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019