Incorrect usage of G3 G4 arc moves?

[Nxt-1]

I wanted to play around with making some demo movements scripts for the delta printer I am close to completing. As a start I wanted to do some circular moves (preferably helical, but I do not think those g-codes are implements as of yet). A quick look at the g-code documentation for arc moves leaves me to understand that if the head is currently located at X+100 Y0, the following g-code should result in a 180° arc move to X-100 Y0.

G2 X-100 Y0 I0 J0

My controller does not seems to agree with me though Anyone know what is happening here?

[A Former User]

you can't have both i and j 0 for an arc, maybe this helps https://www.cnccookbook.com/cnc-g-code-arc-circle-g02-g03/

i.e. try
G2 X-100 Y0 I0 J100 or G2 X-100 Y0 I0 J-100 for an upwards or downwards arc with respect to y?

[Nxt-1]

@bearer said in Incorrect usage of G3 G4 arc moves?:

you can't have both i and j 0 for an arc, maybe this helps https://www.cnccookbook.com/cnc-g-code-arc-circle-g02-g03/

I see it now, I failed to realize that the I and J parameter are not absolute values.