Back or front tool

I believe the idea is to use the rotational word (R):

forum.linuxcnc.org/10-advanced-configura...athe?start=20#216769

[edit]
Not sure what the 'bug' is, he's referring to.

Ist the trajectory aware of the spindle direction?
If not simply use the right tool orientation and let the spindle run backwards.

Or one an negative spindle speed override.

I need to reverse the direction of the tool progression during the generation of the thread Anfanger so simply reversing the spindle does not give me what i need .

Am making mods to the latching relay controls so that machine will respond to M3 and M4 .
Will then look at G10 R180 in the threading routine to see if that gives me what I want !

OK when you use it with spindle synchronized motion its different.
I thought you were using the thread tool conventional and the normal tool in the back.

Machine sets itself up in back tool mode as that is called up in ini file .
For RH thread I could use threading tool reversed in back tool and reverse the spindle but it is then prone to saddle lift,

Hence this question. Will maybe get a chance to try G10 and R180 over the weekend . Sounds like we are in for grotty weather.

Right so called up G10 L2 P06 R180 and it tells me " invalid parameters in linear command"
And "linear move on line 13 would exceed Y's positive limit " And I dont have a Y axis ???????
Line 13 calls up G0 X10 Z10 both within limits.

Help please ??