cheap rev counter

[phil burleyParticipant @philburley12227]

does any one know how to use/wire up one of these cheap Chinese rev counter units . They don't come with any instructions ,

regards Phil

[phil burleyParticipant @philburley12227]

£4. jobs

[ASFParticipant @asf]

[Graham TitmanParticipant @grahamtitman81812]

Hi Phil when you set it up make sure you put the magnet in the right way up the one i had would not work then i discovered turn magnet over and it worked.Graham

[ianjParticipant @ians]

There's a lot of info. in this previous thread:-**LINK**

Ian

[Gary WoodingParticipant @garywooding25363]

Doesn't the magnet cause imbalance?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Gary Wooding on 13/01/2016 08:16:39:

Doesn't the magnet cause imbalance?

.

Gary,

In theory, I suppose it must … But the one supplied is very small and light.

MichaelG.

[HowiParticipant @howi]

The Magnet is 5mm in dia and 3 mm thick, hardley likely to cause imbalance.  

Edited By Howi on 13/01/2016 08:47:49

[phil burleyParticipant @philburley12227]

thanks ever so much , I might be able to get it to work now !!!

regards Phil

[Ian HewsonParticipant @ianhewson99641]

This got my counter to work first time, from a thread a few weeks ago.

[Tim StevensParticipant @timstevens64731]

If the mass of the magnet really is a problem, make up a dummy in brass or stainless and mount it opposite the real one.

I have used on the these tachos on my Champion 20V mill, and it gives a much steadier reading (ie slower changes) than the original. And surprisingly, they do agree pretty well …

Regards, Tim

[norman valentineParticipant @normanvalentine78682]

I bought a cheap Chinese rev counter for my milling machine and spent a long time trying to get it to read off the magnet that I had installed. I only got it to work when someone suggested that I had a Hall Effect Sensor that did not require a magnet and would read off the shallow hole that I dad drilled to mount the magnet.

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