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+--- Thread: speedometer replacement (/showthread.php?tid=9478)
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speedometer replacement - Ralph L. Fullenwider - 08-27-2011 17:03
Don Your right there was an error on my part, it is called a typo, my bad.
My math is for my tires which are 502 RPM not the 501 that I put into the
first post, thank you for catching that and your right it does affect 5 of
the 6 digits, I am fortunate that I got the right answer in the first place
for my application. I guess I may have to sharpen my calculator with SO
many digits, I ran out of room using fingers and toes.
This ends my participation to this thread and will not make any further
posts because heaven forbid I might make a mistake being human. Ever make a
mistake? Yep, happened to me once.
Safe travels,
Ralph and Charolette Fullenwider
"84FC35 "Ruff Diamond"
Duncan, Oklahoma
At 09:18 PM 8/27/2011 -0700, you wrote:
>I always try to simplify formulas where possible. I suspect it was the
>sheer number of decimals used that lead to your making the math error in
>that top line - when you make an error that affects 5 of the 6 digits you
>are fortunate that rounding got you to the right answer.
>
>The teleflex document is of necessity a complex one, because of the many
>different speedometers involved. It just happens that OUR 85MPH
>speedometer is the one where the .0236 and 23.61 can be cancelled into a
>simple 1/1000.
>
>Thanks for the info on the pickup - I had thought that it might be coming
>from the DDEC on mine; internally my DDEC II stopped recording miles (but
>still has MPH) a few years ago.
>
>Don Bradner
>90 PT40 "Blue Thunder"
>My location: http://www.bbirdmaps.com/user2.cfm?user=1
>
>On 8/27/2011 at 10:17 PM Ralph L. Fullenwider wrote:
>
> >Don:
> >
> >The last magnetic pick up or Proximity switch, same thing, that I replaced
> >was on a '95 Bird, so I know it was there up to that year model and I do
> >not know about further years.
> >
> >Another thing that I know, the math that I reported on to set the simple
> >binary switches up for the divide number and the Hertz rate worked. So why
> >confuse with mumbo jumbo of equation changes from a known good formula
> >written for the Teleflex gauge. My install and use of the programming from
> >the web site I published to anyone needing it, worked very well without
> >your change.
> >
> >Safe travels,
> >
> >Ralph and Charolette Fullenwider
> >"84FC35 "Ruff Diamond"
> >Duncan, Oklahoma
> >
> >At 04:21 PM 8/27/2011 -0700, you wrote:
> >>Do all Birds use wheel mounted vs transmission mounted generators?
> >>
> >>Note that there is a math error in the top line below, but it does not
> >>affect the rounded end result.
> >>
> >>However, multiplying by 0.0236 and dividing by 23.61 is funtionally the
> >>same as dividing by 1000, so
> >>501 x 60 / 1000 = 30.06 which is close enough to the 30.047 that using
> >>.0236 and 23.61 would give.
> >>
> >>On 8/27/2011 at 4:39 AM Ralph wrote:
> >>
> >> >501 x 60 x 0.0236 = 710.832
> >> >This number is the HZ rate
> >> >
> >> >Now we take the HZ rate number and divide it by 23.61, which is the
> >> >constant for the divide number and will give the binary number that is
> >set
> >> >up on the program switches in the unit.
> >>
> >>
>