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Date: Wed, 22 Jan 2014 15:23:02 -0500
Message-ID: <CALSZ9gpRgtDUnnvHVGY8zLdWNrAiaEUb5gM3va8vTSbfc+Dr6A@mail.gmail.com>
Subject: Re: [geda-user] Best way to measure RPMs
From: Rob Butts <r DOT butts2 AT gmail DOT com>
To: geda-user AT delorie DOT com
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The application is an arm bicycle where the spinning shaft is connected to
a handle on each end so with no gearing the rpms will not be too high.  I
don't have any encoder yet and I can attach anything to the shaft.


On Wed, Jan 22, 2014 at 3:13 PM, Nathan Stewart <
therealnathanstewart AT gmail DOT com> wrote:

> 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
>>
>
>

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<div dir=3D"ltr">The application is an arm bicycle where the spinning shaft=
 is connected to a handle on each end so with no gearing the rpms will not =
be too high.=A0 I don&#39;t have any encoder yet and I can attach anything =
to the shaft.</div>
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, Jan 2=
2, 2014 at 3:13 PM, Nathan Stewart <span dir=3D"ltr">&lt;<a href=3D"mailto:=
therealnathanstewart AT gmail DOT com" target=3D"_blank">therealnathanstewart AT gmai=
l.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>That depends a lot on =
whats attached to the shaft, how fast it&#39;s turning, and what&#39;s driv=
ing it.=A0 Obvious solutions are encoder, interrupter (photo or magnetic - =
ic engines typically use an inductive pickup on gear teeth), or even counti=
ng pulses on the drive current. If you already have an encoder for other pu=
rposes, that makes a lot of sense. If you don&#39;t already have anything e=
lse that might work, interrupter and divide by is probably the most direct =
method. Sensing the driving forces can be a lot of things,=A0 from stepper =
motor pulses to spark plug firing. <br>

<br></div><div>What&#39;s the application?<br></div><div><br></div><br></di=
v><div class=3D"HOEnZb"><div class=3D"h5"><div class=3D"gmail_extra"><br><b=
r><div class=3D"gmail_quote">On Wed, Jan 22, 2014 at 3:00 PM, Rob Butts <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:r DOT butts2 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:0px 0px 0px 0.8ex;padding=
-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-l=
eft-style:solid"><div dir=3D"ltr"><div>I have a shaft that I want to measur=
e 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 freedom.</div>

<div>=A0</div><div>Thanks</div>
</div>
</blockquote></div><br></div>
</div></div></blockquote></div><br></div>

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