Thread: Proximity Switches
Thanks, i'm liking the look of this approach & I have basic electronics knowledge with plenty of soldering experience so should be easy enough to get them running - any chance of a pic showing how you've got one attached to your machine?
What are you using for limits?
limits switches are for girls!!! the 'limit' is where the ballnut slams into the bearing housing
no pictures im afraid, however they are very simple... wave something metal infront of it... and it triggers
Crafty Just buy some cheap-ish micro switches for limits and wire in series. Also arrange them so they get triggered by running over the switch and not into it. Same goes for Home/Proximity switches.
Also If you want to keep wiring and number of switches down then just have 1 limit switch per axis that travels with that Axis and gets tripped by some fixed but adjustable brackets at each end.
The four you have are Normally Open type, the preferred type for limit switches is Normally Closed.
Also take note when you mount them, if you notice they use brass, stainless, polypropylene mounts.
The last two may be normally closed, it does not say, some of these just change a voltage level so that the input decides if it's on or off.
This manual shows the wiring arrangements but obviously for their own board.
You could wire the sensors so they operate the coil of a N/C relay then use the relay contacts as inputs to your breakout board but it's a backward as you have introduced more things to go wrong.
Personally I would replace them all for 3 wire N/C type.
Last edited by EddyCurrent; 21-10-2013 at 01:53 PM.
If I use them only for homing with additional limit micro-switches will I have any issues being PNP?
PNP is the most common type used so you should have no issues.
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yours are 5-10v so you should not require extra resistors as in this discussion but it makes interesting reading
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