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Will not zero machine coordinates
« on: January 02, 2017, 07:25:28 PM »
My Mach3 has started a new problem. It will not let me "Ref All Home" to zero in the machine coordinates. Is there a setting I should check. I had it working but I'm setting up a new Joe's EVO and the ref all home stopped working.

Offline ger21

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Re: Will not zero machine coordinates
« Reply #1 on: January 03, 2017, 06:34:55 AM »
Make sure that you don't have any values in the Home Off column in Config > Homing.
And, I think there's a checkbox that you need to check in General Config, in the bottom right corner.
Gerry

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Re: Will not zero machine coordinates
« Reply #2 on: January 03, 2017, 08:14:55 AM »
ger,
I'm not sure what's going on. I opened a new Mach3 with no settings and reset ports & pins, and motor tuning. Everything started working ??? ???
Re: Will not zero machine coordinates
« Reply #3 on: March 04, 2018, 01:19:17 PM »
setting up new table all is well' except when I hit ref all z axis goes up to switch and trips switch stops  off set set at 1"  Note on setup i set my unit to imperial ["] x&y are set in inch, z setup in metric is this normal
Re: Will not zero machine coordinates
« Reply #4 on: March 04, 2018, 10:53:38 PM »
Hi,
you cant set different axes to have different units, either they are all metric or all imperial.

Craig
My wife left with my best friend...
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Re: Will not zero machine coordinates
« Reply #5 on: March 05, 2018, 08:11:47 AM »
i reset the units on z .  It would not except to step number before, I since then replaced  the driver now  now it will except the step no.  The ref all still only goes to switch and stops on limit does not back off
Re: Will not zero machine coordinates
« Reply #6 on: March 05, 2018, 08:33:16 AM »
Hi,
Mach only backs off so the switch unmakes, usually only a fraction of a mm from where the switch first operated.

The sequence of events:
1) If the Z axis is the first axis to home as declared in the homing order setting
2) The Z axis drives in its nominated direction and at its nominated speed until the Z axis home switch makes contact
3) The Z axis stops and then reverses until the switch un-makes, usually a fraction of a mm
4) The Z machine coordinate is zeroed, or set to the Home Offset value if so programmed.
5) The next axis in the home sequence is activated.

Note in step 4) if the home offset is set to 25mm say, the Z machine coordinate is set to 25mm, the axis DOES NOT back off 25mm.

I have in recent days been told that one of the popular motion controllers can, if programmed, drive to a 'back off' location. This is done by the controller
not Mach. I think it might be the UCnnn series from CNCDrive. Note it is the controller that does this not Mach and is not standard Mach behavior.

Craig
My wife left with my best friend...
     and I miss him!
Re: Will not zero machine coordinates
« Reply #7 on: March 05, 2018, 06:39:35 PM »
Hi,
found the reference, its not CNCDrives products but PoKeys  that has the ability to back off a given number
of counts.

http://www.machsupport.com/forum/index.php/topic,36634.msg251918.html#msg251918

Craig
My wife left with my best friend...
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Offline ger21

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Re: Will not zero machine coordinates
« Reply #8 on: March 05, 2018, 06:44:27 PM »

I have in recent days been told that one of the popular motion controllers can, if programmed, drive to a 'back off' location. This is done by the controller
not Mach. I think it might be the UCnnn series from CNCDrive. Note it is the controller that does this not Mach and is not standard Mach behavior.


CNC Drives own software will back off when homing, but not in Mach3 with their plugins.

I think that the CS Labs controllers may do this with Mach3. But it looks like they too are developing their own software now.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Will not zero machine coordinates
« Reply #9 on: March 05, 2018, 07:01:25 PM »
Hi ger21,
thanks for that.

I've found it perfectly adequate to specify a home offset then have a macro drive the axis to machine
zero after the homing routine. It achieves the same result, just requires me to excerise my grey matter.

Craig
My wife left with my best friend...
     and I miss him!