meadowfield 2,713 #1 Posted December 4, 2013 (edited) Whilst I can set the idle point and max governed speed on my engine with other tools, there's something about a tacho that brings out the inner geek in me.... Some of you may remember this And this The result was I was armed with enough info to copy the tacho used on the 520h, but make it single cylinder. Here's an off the shelf 0-8000rpm tacho modified for 0-4000. It's way easier to start with a mechanism and modify it, than it is to start from scratch and then find a moving coil gauge. Here's a short video too http://youtu.be/IuKlY0AqeD8 Edited December 4, 2013 by meadowfield 2 Share this post Link to post Share on other sites
dbartlett1958 99 #2 Posted December 4, 2013 Too Clever! Share this post Link to post Share on other sites
Coadster32 793 #3 Posted December 4, 2013 sweet. That looks pretty neat. Share this post Link to post Share on other sites
AMC RULES 37,192 #4 Posted December 4, 2013 OK, now you've done it... I want one too. Share this post Link to post Share on other sites
Save Old Iron 1,571 #5 Posted December 4, 2013 very nice - air core movement or standard RC time circuit? Share this post Link to post Share on other sites
SousaKerry 503 #6 Posted December 4, 2013 Cool, now how do I build one. And believe it or not your YouTube video came up in my suggestions even though I am not subscribed to you, but I did not watch it at the time cause I didn't know what it was. :confusion-scratchheadblue:Dang YouTube knows what I want to watch 2 days before I do Share this post Link to post Share on other sites
VinsRJ 723 #7 Posted December 4, 2013 OK put me in line too... I want one! Share this post Link to post Share on other sites
meadowfield 2,713 #8 Posted December 4, 2013 very nice - air core movement or standard RC time circuit? Moving coil and I think magnetically damped. It is very smooth for a $15 Chinese part. Share this post Link to post Share on other sites
Save Old Iron 1,571 #9 Posted December 4, 2013 I had considered re-scaling a 270 degree voltmeter for the same purpose. Its always the disassembly and resealing of the gauge that made me hesitate. I am also considering a 4X frequency multiplier {PIC based} to allow use of a standard digital tack to be used without breaking open the caseworks. Share this post Link to post Share on other sites
meadowfield 2,713 #10 Posted February 9, 2014 (edited) I know I've been a bit slow on an update to this, other projects getting in the way! As it's so wet outside, I've finally hooked it up and done a short video. I really need to get a hole cut in the dash and get it mounted now. Note, I have the governor set a little low, I don't like running this engine at full tilt anymore. It's 35 years old and a little tired, it will get a rebuild, but in the meantime I will look after it. Here you go, apologies for the wobbleation, both me and the tractor aren't too stable Output is taken from one of my modified RR units. Edited February 9, 2014 by meadowfield 2 Share this post Link to post Share on other sites
Anglo Traction 761 #11 Posted February 9, 2014 When you've got the Horse all 'Rigged Up' Mark, maybe you can give us an idea of the max Output parameters of the Stator in relation to Rpm. I also like to run mine a couple a hundred Rpms down from max and still get adequate output. Share this post Link to post Share on other sites
wheeledhorseman 579 #12 Posted February 9, 2014 Moving coil and I think magnetically damped. It is very smooth for a $15 Chinese part. Looks real smooth - a bargain from China! Did you stick a new vinyl scale over the old or just redo the numbers? Andy Share this post Link to post Share on other sites
meadowfield 2,713 #13 Posted February 9, 2014 Looks real smooth - a bargain from China! Did you stick a new vinyl scale over the old or just redo the numbers? Andy It's a new scale Andy. The reverse still says 0-8000 :) Share this post Link to post Share on other sites
