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Edit.


@raptessmistfyre wrote:

Hi, sorry, yes I am using Mach3 post processor.

 

I understand the G28 G91 Z0 is a move to home command ..

This tells the machine to go to Z0 1st, then proceed move to X0,Y0,A0 ..

 


 

I don't think you do understand. The G28 is a move to the machine home (G53) not the part home (G54 or what ever offset you are calling).

 


@raptessmistfyre wrote:

 

But why is it in the program, when the home position for my Rotary is 22mm below the surface of the material ?

How do I set a Z0 position to the top surface of the material, instead of the center of the rotational axis ?


 

Does your machine have limit switches? You need to home your machine or set G53 X, Y and Z to a safe point, not sure how you do that manually, my machine has limit switches and the homing cycle sets the machine home (G53 is machine coordinates and G54 is the work coordinate system) automatically.

 

See this page for more info on G28. 

 

Mark Hughes
Owner, Hughes Tooling
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