Rear approach and gang tooling

[Anonymous]

I'm trying to use gang tooling with an approach from the rear of the machine. No matter what I've tried, the tool always tries to go across spindle center line. I've had some success by substituting X to X- but when there is a radius involved the I and J are backwards as well.

I'm using a Centroid Mill/Turn Post

[engineguy]

@Anonymous 

What setting do you have for the Turret under the Post Processor tab for your tool, for Gang tooling it should be either 103 or 104, I would be leaning towards the 104, below is a small Facing pass and the only X- value is the TNR of the insert times two, does this help ??

;1001
N10 G98 G90
N11 G21
N12 G50 S6000
N13 G28 U0.
N14 G28 W0.

;FACE1
N15 T3000
N16 G54
N17 M8
N18 G99
N19 G97 S343 M4
N20 G0 X65. Z5. T3030
N21 G50 S5000
N22 G96 S70 M4
N23 G4 P1.
N24 G0 Z0.914
N25 X45.
N26 G1 X37.828 F1.
N27 X35. Z-0.5
N28 X-0.2 F10.     This is the only X- value
N29 X2.628 Z0.914 F1.
N30 G0 X65.
N31 Z5.
N32 G97 S343 M4

N33 M9
N34 T3000
N35 G28 U0.
N36 G28 W0.

[Anonymous]

Thanks for the input. However, I cannot seem to find where I can actually set the turret position to 104. I followed the instructions on youtube but my edit tab is grayed out and will not let me. Any suggestions?

[engineguy]

@Anonymous 

Not sure what you meant by your "Edit is greyed out", where are you trying to set the 104 ??

I set it in the tool under the "Post Processor" Tab as in the image below and that seems to work, for example a TNR value of 0.8mm will result in an X-1.6mm travel on a simple Facing operation so that would look correct to me.