BX2200 Tachometer

[patrickg]

The alternator output before rectification is AC (alternating current). The frequency of this ac voltage is a function of RPM of alternator but since ratio of engine RPM to alternator RPM is pretty well fixed (unless belt is slipping pretty badly) you may think of it as engine RPM dependent. A simple RC (not radio control but resistance capacitance) circuit, called a high pass filter will yield a frequency (RPM) dependent ouput. You can rectify this output and drive a DC volt meter with it. Use a meter with a large deflection (say 270 degrees or so). Carefully open the meter take the dial (has the numbers on it) out and turn it around and reinstall with non-printed side out (visible.) Draw up a dial calibrated to your circuit parameters and glue it on to the meter dial. Voila a tachometer. Some folks prefer to draw an over sized blow up of the desired meter scale, photograph it and then use a print of it reduced to the correct size to make a neat dial face. Yes, kids, you may try this at home. If you have a friend or neighbor who is a ham radio type, electronics tech, or engineer they should be able to draw you a schematic diagram in a few minutes. And if they are fairly good they should be able to make a few measurements on your tractor, some calculations, and provide a parts list to take to Radio Shack. Except for meter, parts should not exceed a few bucks. Meters run from cheap trashy stuff to expensive, I'd opt for above the moiddle of the road and be interested in its being somewhat vibration and shock resistant to survive in a tractor environment. Might want some RTV to seal it up. Don't seal any dial lamp too wel,l they burn out you know. Good luck!

Patrick

 

[StoneHeartFarm]

Jor El,

Actually, I have paddled a rubber raft. My one and only excursion with my so called "river raft" on a nice calm lake left me pretty much exhausted from the paddling. /w3tcompact/icons/crazy.gif Of course, the paddling got noticably easier after I heard that bubbling hiss coming from under the bladder by my right hip. /w3tcompact/icons/smile.gif I guess they're easier to paddle when the air is out of them. /w3tcompact/icons/laugh.gif

SHF

 

[woodstock]

JOR_EL you asked
Woodstock,
[[[Wasn't the first mechanical transportation vehicle, not powered by man or beast, the steam Engine (rail version). then the steam automobile.]]]

Actually it wasn't it was a car but they made so much dam noise they banned them to special road ways which turned into railways, hense the steam engine on rails.

Winnipeg, Manitoba

2001 BX2200 (15 hrs) All Kubota FEL,Tiller, box blade, blower w/elec shute, 60 mid mt deck, Ag tires.
Grey market B7000 w/Tiller (120 hrs)
1984 JD 316 after 687 hrs.

 

[woodstock]

Patrick,
There once was a time when I would have had all the necessary junk to make your project, sitting in the left-over parts bin.
My Mom use to call me Sparkie, because I was "always making something with wire." as she use to say.
Unfotunately, my wire is too short now. (read wire as time) I think I'll just buy one but I like your style Patrick.

As far as the rubber raft goes, Canada is like a bigger Texas. Would a Texan paddle a rubber?

Winnipeg, Manitoba

2001 BX2200 (15 hrs) All Kubota FEL,Tiller, box blade, blower w/elec shute, 60 mid mt deck, Ag tires.
Grey market B7000 w/Tiller (120 hrs)
1984 JD 316 after 687 hrs.

 

[woodstock]

Speaking of Texans that reminds me of a good joke.

How can you tell the difference between a Real Cowboy and an Urban Cowboy?

Winnipeg, Manitoba

2001 BX2200 (15 hrs) All Kubota FEL,Tiller, box blade, blower w/elec shute, 60 mid mt deck, Ag tires.
Grey market B7000 w/Tiller (120 hrs)
1984 JD 316 after 687 hrs.

 

[patrickg]

OK, SPARKY, just because you built wilth wire? NO SPARKS?????

Yeah, I admit some of my projects are low payoff. Even in the olden days before Grief oops I mean Heath Kit went toes up (Sorry, Benton Harbour) building with a kit rather than from sctatch could still yield salary equivalents of maybe .05 per hour (American). If I charged the prevailing going rate for design time, prototyping, trouble shooting, packaging, layout, etc. I couldn't justify many of the fun things I've cobbled together B U T it sure is fun to whomp something up that has a high gee whiz factor that isn't available as COTS (Commercial Off The Shelf) hardware. I didn't just think of the design for the tach on the spot, I thougt of it several decades ago and several buddies built them, real cheaply and of course they got bragging rights as well.

Patrick

 

[JOR_EL]

<font color=blue>JOR_EL you asked
Woodstock,
[[[Wasn't the first mechanical transportation vehicle, not powered by man or beast, the steam Engine (rail version). then the steam automobile.]]]

Actually it wasn't it was a car but they made so much dam noise they banned them to special road ways which turned into railways, hense the steam engine on rails.</font color=blue>

Woodstock, ...not so!! /w3tcompact/icons/shocked.gif

I wasn't asking, ...I was disputing (your response to GlennMac)!

Did you miss this part of my post?:

<font color=blue>Maybe you should say "wheeled" transportation vehicle, if you're going to so rudely ignore the sailboat!

(or did the first Euro-Canadians "steam" over?)

Larry</font color=blue>

My contention is that wind(NOTman or beast)-powered vessels are both "mechanical", and "transportation vehicles"! ...and that they preceded the "steam engine(rail version)" or any other version.

Do you disagree? (After all, you were talking "first"!) /w3tcompact/icons/laugh.gif

Larry