horizontal axis substitution

[JDowe]

Using the 4 axis hmc that comes with x - if I

try to program an arc using the b axis the axis

subsitution selection in the rotary axis dialog box is not active - the program will index but not do rotary motion - a machine brought in from 9 using updatepost works fine - the machine def for the hmc that came with X is set to allow full rotation - the 4 axis vmc that came with X works perfectly using the same post as the hmc -

Question is how or where can I activate the

axis substitution for the horizontal -

Thanks for any help guys