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Messages - Geoff_S

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I'm running a mini mill with physical limit and homing switches.  No tool changer or anything fancy. 

I fire up the machine, Ref All axes and zero all axes, and then move the machine to some arbitrary position and click "Remember Position".  If I then jog the machine to some other position and click "Return To Position", the Z axis moves up until it hits the home switch, but the X and Y axes don't move at all.  No errors or warnings show on the screen.

Not sure why it doesn't return to the position where I originally clicked on "Remember Position".  Have I misunderstood how these buttons should work?  Or missed a step somewhere?  Or is there is a bug in my setup?

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PoKeys / Re: Pokeys57CNC and homing to middle ?
« on: August 17, 2019, 01:51:28 AM »
Thanks.  Is Mach4 able to read the curent state of a homing switch, or can it only detect changes in home switch states ?  Looks like I'll spend some time reading up on the API.  I'm quite comfortable with programming generally, just no experience yet with Mach4's API.

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PoKeys / Re: Pokeys57CNC and homing to middle ?
« on: August 17, 2019, 12:15:08 AM »
You have identified one problem however. If for instance you set the initial homing direction to the right, and when at power up the machine was already to the right of the home switch, the machine will travel yet further to the right hitting the end of the axis before any home switch activation.

Yep, this is exactly what my question was.  So currently there is no option to directly address this.  Putting the home switches at one end of the travel is what I'd like to avoid if possible.

I haven't really looked into this at all, but would it be possible to use a script in Mach4 (LUA ?) that runs as part of the homing routine - to initially drive all axes out of home, then resume the regular "move towards home" routine ?

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PoKeys / Pokeys57CNC and homing to middle ?
« on: August 16, 2019, 08:06:53 PM »
I'm converting a mill to use a Pokeys57CNC controller with Mach4, and looking at setting up the homing switches.  Currently the homing switches on the X and Y axes use inductive probes for homing switches, and they're located in the middle of the travel.

The Pokeys user manual describes how homing switches can be configured for various options ("On home" and "Out home"events etc) but I can't see one which allows for homing to a switch in the middle of travel, ie when the machine powers up, it may be either to the left or the right of the home switch, and will need to travel in the appropriate direction until the home switch changes state.

Is this possible with the Pokeys575cnc or will I need to change to home switches at the ends of the travel instead ?

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Thanks for the suggestions.  I think I'll go with the zener+470R combination even though not strictly necessary for my current situation (sensor has 4k7 pullup), just in case I change the sensors in the future and forget how I had things wired up.

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I'm in the same situation of wanting to use my pokeys57cnc board with inductive prox probes (Fotek PS-05N which have npn transistor with an inbuilt 4k7 pullup resistor and run off 12V). 

On the previous page, joeaverage posted two options: either zener diode with series resistor, or blocking diode.  Is there any reason to prefer one option over the other ?  Seems like the single diode option would be just as good as any other, and simpler.

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