Machsupport Forum

Third party software and hardware support forums. => PoKeys => Topic started by: whizbang on March 16, 2014, 01:36:00 PM

Title: PoKeys and Limit Switches
Post by: whizbang on March 16, 2014, 01:36:00 PM

Hello,

If I bought  PoKeys would there be a way to wire in another limit switch that always halted travel in my Z axis? I ask this question because I have a Novakon CNC with linear rails in the Z axis. When manually jogging I discovered it is possible to travel beyond the limit switch (my limit switches are proximity sensors not mechanical) and actually run the top slides off the linear rails, and in accidentally doing this I also managed to pull out my oil line. My proximity switches used for homing the machine do not stop/halt travel when manually jogging.

Thanks,
Whizbang

Title: PoKeys and Limit Switches
Post by: Fastest1 on March 17, 2014, 09:12:23 AM

I posted in the other thread but do you have this "homing" switch also enabled as a limit switch? Is it at the end of travel? Soft limits will stop the over travel issue.

Title: Re: PoKeys and Limit Switches
Post by: NeoTO on March 17, 2014, 12:41:11 PM

Basically, PoKeys supports three switches per axis - limit-, home/ref and limit+. They used to be handled separately, but since version 3.1.0, PoKeys devices now support combined home and limit switches. The behaviour of limit switches is that motion is halted anytime the limit switch is hit unless in homing mode (if home/limit combined option is enabled). The limit switches can also be disabled by enabling 'limit override', but then the machine's safety is in operator's hands.