Electronics for New Machine + Chinese Spindle + VFD

**cropwell** · 29-11-2015

Originally Posted by JAZZCNC

They will sense Aluminium but you have to get very very close and they are erratic so NO is the answer. Sense to a bolt head or Metal plate etc.

If you run your target bolt head axially on to the sensor, one day you will jog onto it and crush the coil in the head. Put your sensor at right angles to the motion of the axis, so the bolt passes by the sensor. My MD machine was designed with axially mounted sensors. Jeesh !

Rob

**JAZZCNC** · 29-11-2015

Originally Posted by cropwell

If you run your target bolt head axially on to the sensor, one day you will jog onto it and crush the coil in the head.

Rob common sense to me and can't believe MD or anyone would position any switch not to mention Prox switches so they could be crashed into.!

Another reason is the sensing repeatabilty is actually better when sliding over rather than approaching head on. Most Quality Prox switches data sheets will give specs on both types of approach.

**Neale** · 29-11-2015

Common sense because you've researched and tested the answer! I would have thought (probably like a lot of people) that end-on would give better results although I am now quite convinced as a result of your testing demo a while back. I did worry about over-run though, and it's good to know that there's a simple answer.