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use of 4th axis
« on: September 24, 2019, 07:23:00 AM »

I have a 4 axis machine with axis 4 (A) on a turn chuck.

I wanted to understand better how mach4 handled requests to turn?
1) on a rotation table, there is 2 ways to get to a given angle, clock wise and counter clock wise. How does mach4 determine which way to go?
2) let us say that A=0°, how do I tell mach4 to do a full turn (+360°)? doing a G01 A360 does nothing as mach4 seems to just stay in place.


Offline Chaoticone

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Re: use of 4th axis
« Reply #1 on: September 24, 2019, 01:13:40 PM »
By giving it a + or - move in your Gcode.

Do an incremental move of 360 + or - depending on which way you want it to go to get there.

There are a few things you might want to play with/study up on to better understand how rotational axis work.

1) G90 and G91 (absolute/incremental) position modes

2) In Config/Control/General the rotary axis rollover can be enabled or disabled (close Mach and restart if you change it). This makes the work coordinates 360 and 0 equal (since it is physically the exact same position).

3) Moving in work coordinates (G54, G55, etc) and moving in machine coords (G53). 

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