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Inside A Cheapass Tachometer (Patreon)

Published:
2021-05-08 19:50:04
Imported:
2021-10

Content

Can a cheap contact tachometer be any good?  Let's find out!

https://youtu.be/jXbO8Y18vnQ

Files

Inside A Cheapass Tachometer

Can a cheap contact tachometer be any good? Let's find out! Join Team FranLab!!!! Become a patron and help support my YouTube Channel on Patreon: http://www.patreon.com/frantone #teardown #cheap #worst - Music by Fran Blanche - Frantone on Facebook - https://www.facebook.com/frantone/ Fran on Twitter - https://twitter.com/contourcorsets Fran's Science Blog - http://www.frantone.com/designwritings/design_writings.html FranArt Website - http://www.contourcorsets.com

Comments

BobC

I got rid of my contact tach decades ago, mainly because I didn't like getting that close to rotating equipment with power applied. Got a non-contact laser tach and never looked back. I get very accurate readings a meter away from a 3 cm shaft. I keep some emery cloth handy to dress dirty shafts, and some white nail polish when I need to add a reference line, though a piece of tape almost always does just fine. With careful aiming it even works great end-on.

lohphat

Thank you for not hyphenating "cheapass". https://xkcd.com/37/

Anonymous
>>59436042

Well you could use it as a cheap ass-tachometer, assuming your ass has fairly regular rotation

Anonymous

Somewhere... Someplace.... Someone was giving a PowerPoint presentation on the design of this thing and a room full of engineers said, "Oh, yeah! That's great!" Another room of mechanical designers also thought "Oh, wonderful!" And some Program Manager said "There's no way we can't make money on this!". Then whoever distributed this said "Ah, it's cheap. Our customers won't know the difference. No one would actually open it up to see this abomination of tolerances." Then you bought it and exposed just how low all of them can go. You could have built a better one with a used rotary encoder and Audrino board!

MVVblog

Hi Fran, cheers from Pisa

Anton

Oh that thing is utter rubbish. Should use AA rather than AAA (at least it didn’t use button cells!) The shaft should have two bearings, or a main bearing and a sintered bronze bush near the rotary encoder to avoid vibration noise and inaccuracies. The rubber parts falling out is laughably bad, what cheap trash. I’d be returning it on that issue alone. I suspect is does have a ball bearing, but a very cheap n nasty thin one hence the incredible sloppy play. As for the photogate, wow, just wow.

Mike O'Dell

Laser Optical Taco - no muss, no fuss, no men left on base. Yes a fine-tip white paint marker is a useful addition in the carry case. But you leave all the other grief.

Anonymous

You could fill that top plastic piece that holds the shaft with epoxy, drill out the hole after it cures, then cram two good bearings in it. Lipstick on a pig for sure, but at least it'd be mechanically sound.

frantone
>>59435762

I need a contact because the rotation rates I want to measure for clocks and geared motors is quite slow.

Mike Hughes

Hi Fran, it's me again, I have just been watching a Russian guy spin a tyre ( sorry Tire) up to stupid speed and record it on a UNI-T UT372 tachometer. AND Guess what, they are as cheap as chips and non contact!!! : https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=UNI-T+uT372+tachometer&_sacat=0 Here is the video to watch it: https://www.youtube.com/watch?v=Evkk1WwnpXg I have some of their gear and it is excellent quality. Hope this may help you, (you can always ebay your crappy one so as to offset the cost) Best wishes as always. Mike