Rejects valid G-Code for simple circle

[fireup924]

When I create a simple circle in my CAM program without lead-in or lead-out it will Post a simplified G-Code and grblHAL will give a

"error:26 No axis words found in block for g-code command or current modal state which requires them."

Here's the G-Code that it will fail on, even though it's a valid G-Code

G20
G90
G40
G17
G92X0.0Y0.0Z0.
G0 X10.375 Y5.8438
M3
G3 I-4.5312 F100.0
M5
M30

I have to manually copy the X,Y positions to G3 line for it to except the G-Code such as:

G20
G90
G40
G17
G92X0.0Y0.0Z0.
G0 X10.375 Y5.8438
M3
G3 X10.375 Y5.8438 I-4.5312 F100.0
M5
M30

Is there a way to fix this in the grblHAL G-Code parser?

[terjeio]

Form NIST RS274NGC v3, section 3.5.3.2 Center Format Arc:

It is an error if:
• X and Y are both omitted,
• I and J are both omitted.

So perhaps NIST is incorrect?
BTW it looks like LinuxCNC may have lifted the first restriction, can somebody verify?

[fireup924]

I haven't try LinuxCNC but I tried a UCCNC and an Industrial FANUC machine and they both will accept the first G-Code with only I or J value for G3

[spxwh]

Different machine tool controllers have different rule requirements, which is a simple problem that can be solved through post-processing. Post-processing is exactly designed for this purpose.