[Jakeh_26]

I am trying to modify a post processor for a bed mill with a universal head.
the machine can work in Z axis, Y axis, and X axis in both + and - directions.
the machine is a butler with a fanuc series 6 control.

i have a working post for the Z axis. its a modified 4 axis mill post and works great.
however when programing the Y axis i use the back T/C Plane in mastercam, drawing the part in mastercam exactly how it sits on the machine.
i have copied and edited my Z post to output all Z movements as Y movements,
and vise versa to suit my machine.

the problem is all my X axis co-ordinates are inverted because im using the back T/C Plane.
because X is inverted, so is my I for rad centre.
so far i have edited my post to output all X and I values with a + sign.
then changing (X+ to X-)(X-- to X) and same for I.

im desperate to find a way to get my post to swith + for - so i dont have to edit every program.
ive tried using:

xabs = xabs * -1 # <------Invert axis output

on all rapid, feed, and circular
movements but got funny results.

any ideas?

[mykul]

I had a similar mod but in the Y axis.
Have you updated both xabs and xinc in both pfxout and pxout. the incremental will valid if your arc centre I is incremental.

[tinhle]

Change the veto somthing like that: axisx$ = rotv(p_vec_rot, axisx$)

[Jakeh_26]

none of these seemed to work. I ended up adding the following lines under the # INITIALIZE - initialize system variables section of the post.


#Position control variables
x_mult : -1 #Multiplier for output on X axis
y_mult : 1 #Multiplier for output on Y axis
z_mult : 1 #Multiplier for output on Z axis

this is the only thing that can do it properly. it simply multiplies all X values by -1, effectively inverting all X values.
works a treat. can be used for any axis, even IJK's for rad centers.