[Diy_efi] Stepper Motor to drive mechaical speedo

[Hugh Keir]

I have tested a smaller stepper motor, but it was too slow.

Have ordered a non geared stepper motor which has a spec sheet that says
its good for 500 PRM and will try again.

Stepper motors are torquey at very low RPM, so if this motor will turn the
speedo, I will keep going with it.

Be interesting to see whether the stepper or a DC motor system works best.

Hugh




Normally it's going to be 1000 turns\mile.  Dials out to be 60MPH as well.
Some British speedos are different, but are usually marked in tiny script on
the face.
Jim

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of jayjunk at laserpubs
Sent: Friday, October 19, 2012 9:23 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Stepper Motor to drive mechaical speedo

Ok - is there a standard revs/mile for a speedometer/odometer?
The only thing I found so far is for a Vincent motorcycle!
(1600 rev/mile)

cheers...

On 10/19/2012 5:04 PM, jayjunk at laserpubs wrote:
> Funny- I was going through my garage and found my stash of gauges.
> I found a 120 mph mechanical speedo (SW style) that will be just fine
> for my mutant Corvair.
> Now I need to look around for a DC motor with enough grunt to drive the
> speedo!
>
> cheers
> Jay
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