Cutting an ARC

[Joseph Walsh]

I have looked at the manual on how to program arc, but I have had no success.
Sometimes I get a straight line, and other time I get a full circle, even though I thought I was programming a 90 degree arc.
Obviously the starting position is important.
Can someone help me here.
For now I would like to do the following
Draw a 90 degree arc, clockwise direction, centre at X10Y10, the arc staring at X10Y15 finishing at X15Y10
Draw a 90 degree arc, anti clockwise direction, centre at X10Y10, the arc staring at X10Y15 finishing at X5Y10

Thanks in advance.

[ger21]

Yes, the starting point is important, so you need to move there first.

Draw a 90 degree arc, clockwise direction, centre at X10Y10, the arc staring at X10Y15 finishing at X15Y10

G0 Z1
G0 X10 Y15
G2 X15 Y10 I0 J-5 F50

Draw a 90 degree arc, anti clockwise direction, centre at X10Y10, the arc staring at X10Y15 finishing at X5Y10

G0 Z1
G0 X10 Y15
G3 X5 Y10 I0 J-5 F50


I and J specify the location of the center relative to the start point.
So, if you start at X10, and the center is X10, than I = 0
If you start at Y15, and the center is Y 10, then J = -5

[Joseph Walsh]

Thanks Gerry,
That worked just fine, so I will work on from there.

Regards,
Joe

[Dan911]

or....

X10 Y15
G3 X15 Y10 R5

https://www.cnccookbook.com/cnc-g-code- ... e-g02-g03/