cheap rev counter

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

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

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

Ian

Doesn't the magnet cause imbalance?

.

Gary,

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

MichaelG.

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

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

regards Phil

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

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

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.