A circle, a simple circle. How hard can it be?
I'm new to CNC having built a 2-axis plotter driven by Arduino, CNC-Shield and GRBL 1.1.
I can draw a square.
I now want to draw a circle and have failed miserably for days.
I have googled on and off for about a week now and looked at dozens of examples. Not one of them does a circle. Not on my machine nor in any of about 5 different simulators I've tried. At best a limp arc, at worst straight lines or nothing.
Come on.
A circle.
Could someone post the GCode to do say a circle centered at X=0,Y=0 with radius 5cm?
Since I now believe it is impossible. Please check your work here:
GCode Simulator
or here:
https://nraynaud.github.io/webgcode/
Re: A circle, a simple circle. How hard can it be?
G0 X0 Y5
G2 X0 Y5 I0 J-5
Doesn't work in the first simulator you linked, but works in the second one.
Re: A circle, a simple circle. How hard can it be?
Hi, if you took the time to learn G code all will be revealed, but you gotta be in it to win it.
Ian.
Re: A circle, a simple circle. How hard can it be?
Quote:
Originally Posted by
ger21
G0 X0 Y5
G2 X0 Y5 I0 J-5
Doesn't work in the first simulator you linked, but works in the second one.
Yeah... doesn't work on my machine (running GRBL).
The first command works but the circle doesn't and I get:
error 33 for G2 X0 Y5 I0 J-5
Re: A circle, a simple circle. How hard can it be?
OK, the circle code works in UniversalGCodeSender but not in GrblController 3.6.1
I thought these programs just send GCodes to the machine so how can they get different results??
Re: A circle, a simple circle. How hard can it be?
Different controls read g-codes differently.
I think that GRBl doesn't allow full circles, only partial arcs.
Re: A circle, a simple circle. How hard can it be?
But GRBL is on my Arduino - I'm just switching between different PC software which both send "G2 X0 Y2 I0 J-2"
Re: A circle, a simple circle. How hard can it be?
I think that Universal G Code Sender breaks the circle up, and sends multiple arcs to GRBL.
Re: A circle, a simple circle. How hard can it be?
I think I see what's happening. If you're in relative mode (G91) you can't draw circles.
FAIL:
>>> G91
>>> F100
>>> G0 X0 Y2
>>> G2 X0 Y2 I0 J-2
ok
ok
ok
error:33
SUCCESS
>>> F100
>>> G0 X0 Y2
>>> G2 X0 Y2 I0 J-2
ok
Is there any way to just draw a circle centered from wherever you are?
Re: A circle, a simple circle. How hard can it be?
Quote:
I think I see what's happening. If you're in relative mode (G91) you can't draw circles.
You can, but the code is different.
G91
G0 X0 Y2
G2 X0 Y0 I0 J-2
