g-code help

[gldavison]

I have never used the a axis feature on my cnc router. So  I am doing some experimenting.  After the last operation A is at 270°. The next operation requires A to rotate a full 360° once, then  move Z and rotate again. So now my problem.  If I tell A360 it only moves 90°. So I figure 270+360=990. That will rotate A one turn. To get one move rev the next A code of A0 results in 3 full revolutions.

So my question is resetting A to 0000. My cnc software is DeskCnc. The g-code listing for that is G10L2 with a reference to G54. I am totally lost trying to make this work 

 Need some help.

[Doc]

Do you have it set to incremental G91 I think then give it a A 360 and it should move  360degrees you can then give it a A -360 and it should move 360 back.

[kvom]

Since 990 is same as 270, you can move to A 1080.

G92 A0 will reset the A coord to 0 on some controls.

[gldavison]

Thanks guys. I'll give that a try tomorrow.

[Vixen]

 So I figure 270+360=990. That will rotate A one turn. To get one move rev the next A code of A0 results in 3 full revolutions.

It will work as expected if you use 270 +360 = 630, when in absolute (G90) mode.

If you toggle between absolute (G90) and Incremental (G91) modes, you can make the 360 degree move with A360 while in incremental mode. Remember to switch back to absolute mode for the following XYZ moves

You can also reset the angle display to zero at any time using G92 A0. However it is safest to only do the reset when the display reads 360 degrees, otherwise you can loose your A reference point and become lost

Mike

[Noitoen]

Is't there a way in the parameters to "tune" the rotary axis to reflect the correct movement in degrees?

[gldavison]

G thanks fellows, the G91 worked, and i for got to try G92. Tomorrow

Is't there a way in the parameters to "tune" the rotary axis to reflect the correct movement in degrees?

In my software you just tell A how many steps per degree. There may be more, i am no expert at this.

[Noitoen]

G thanks fellows, the G91 worked, and i for got to try G92. Tomorrow

Is't there a way in the parameters to "tune" the rotary axis to reflect the correct movement in degrees?

In my software you just tell A how many steps per degree. There may be more, i am no expert at this.

You can adapt the number of steps to get the real degree result you want. In this way you don't have to figure out what virtual angle you have to program to get the one you want.