So I have a piece of code  produced as an exercise in Mach3.
I try to load it into Mach 4 as a test routine .
An error comes up saying unrecognised code in line 1   which is   "G18 G64 G80 G90 G40 G49 "
Now not  being sure of all the codes I just deleted line 1 to see if it would work presuming there would be  defaults in there which would work anyway.
So now when I load  into Mach 4 it is happy to load and run  but with crop circles on the display and the machine happily follows these in run mode .
I have had these before in Mach 3  and I seem to remember it being to do with the absolute or incremental modes
Can anyone remind me how to change these in Mach 4

Which piece of code in line one is upsetting mach 4  and why?
It surprises me that code is not portable between on and the other

Hello,
G91.1 is for Inc Arc center and you can select that (or ABS) under configure -> Control and the ArcCenter mode

Now as for your Gcode. I am going to on out on a limb and say you are running a lathe. I say that because your plane selection is in the XZ plane (G18). Mach4 has a full Lathe Gcode interpreter, mach3 has a hacked to sort of lathe interpreter . mach4 changes the Gcodes to match what you will see in a trade school on a lathe. If I had to guess G49 is the one that is giving you trouble I would also take the G90 out as INC ABS codes are not used anymore in turn. INC moves are done with the U and W. It's really cool you can move the X axis U.005 while you do a Z -1.0 and take a tapper out of a part that you machine may be putting in (mechanical issue ) . We do things like that all the time when we are ruining production.

Hope that helps and gives you a little insight as to why your seeing what you are.

Thanks
Brian

Doesnt really help me to overcome the problem Brian.

Okay let’s take this a little slower, are you running a lathe or a mill?

Lathe ,
Runs code happily in mach 3 but that same code jut gives me crop circles in mach 4  regardless of abs or inc  arc settings in control page .


I am also finding that when I exit from Mach 4 there is a copy of Mach4 gui left running in the background  which prevents me from reopening "Mach 4 lathe" so I have to go into application manager and delete before I can open mach again. or restart the whole computer.
There are other strange happenings   too ..  left arrow on keyboard now jogs right. It was fine a couple of days ago .
When I go into Diagnostics/ keyboard settings  I cant change it back.  The screen has a flicker .
I presume these latter issues are not connected to the crop circles , but all adding to my initial experiences of Mach 4 .

What are you running for a plugins? And are you trying to do Modbus and not getting the communications? Something is not allowing the core to shutdown.
Please upload a gcode file and I will tell you what is wrong. Mach3 is way more mill and 4 has a full on turn Gcode interpreter.

I want to help but I need you to help me help you. I wish I could see what your seeing because I could do more.

What are you running for a plugins? And are you trying to do Modbus and not getting the communications? Something is not allowing the core to shutdown.
Please upload a gcode file and I will tell you what is wrong. Mach3 is way more mill and 4 has a full on turn Gcode interpreter.

I want to help but I need you to help me help you. I wish I could see what your seeing because I could do more.

Hi Brian
Sorry I have not been around for a few days .
The only plugin AFAIK is the UC100 one ,  I have never tried anything to do with modbus.  I saw it in the config memory  but I am going one step at a time so was not tempted to anything new . 

I find this is a nuisance though.

Do you get involved in problem solving by screen sharing

If you can send me a PM and I will have one of the guys contact you to check out your PC.

G90 is the culprit.  Since M4 has gone to Fanuc style gcode lathes do not have absolute /incremental 90/91, instead use xyz for absolute and uvw for incremental.
Also UC100 Mach4 plugin has not been fully tested on a lathe and they have said not to expect it to.  Had one and dumped it after they told me that.

THT

RT