wiring

I just want to connect a 4 LED Digital Tachometer to a SX2 mini mill. I do not want to install a new hall effect sensor , but just to use the mill's inbuilt recorder.

If I understand correctly, you wish to use a generic tacho. similar to those offered on Ebay without the supplied sensor.

I looked into this on a Sieg mill that I used to own. It appears to be far from straightforward.The motor was DC, there's no speed -proportional frequency in the system so just wiring one in was not an option. The solution that I found on-line involved a micro-processor and code and hence over my pay-grade, so I fitted a magnet and hall-effect sensor.

Over to the experts.

There are various versions of "SX2". For starters what motor type, brushed or brushless, does your mill have?

If you don't have athe skills to work it out for yourself, unless you can find someone who has fitted the exact same tacho to the exact same mill you would be better of using the hall and magnet supplied.

Robert G8RPI.

This may either help or put you off!

**LINK**

I don’t think it is simple. I found this via Hackaday on the internet, where someone has reverse engineered the pi outs and data protocol: **LINK**

If you are into electronics it would be an interesting project to make, but no doubt it is cheaper and easier to buy a complete lcd with sensor and fit this.

Stuart

Too slow typing! Nick beat me to it.

Stuart

For the record, on my X2, that doesn't have a fitted tacho, I just popped a 5mm neodymium magnet onto a spindle adjustment nut and used a hall effect chip held nearby, and it worked fine.

Since converting it to poly-vee drive I use a small ceramic magnet glued to the aluminium pulley

Neil

Ditto.

I have an sx2p from Arc and copied the build in this video from Andrew Whale using an Arduino board **LINK** There are 2 videos that cover the process