Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: gene8522 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.
-
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.
-
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 ??? ???
-
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
-
Hi,
you cant set different axes to have different units, either they are all metric or all imperial.
Craig
-
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
-
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
-
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 (http://www.machsupport.com/forum/index.php/topic,36634.msg251918.html#msg251918)
Craig
-
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.
-
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
-
Unless you have a slaves axis, and can back off the master and slave different amounts, which can be very helpful.
-
Hi ger21,
yes thats correct however as I'm now using Mach4 I can do that too, there again grey matter only required.
Craig
-
Sorry