Lathe spindle feedback

Sir,
Kindly tell us linuxcnc can work with single input (phase A or index) for spindle feedback regarding lathe threading.

The problem is you can't tell the direction of rotation, with a single input.

Thanks for your reply, but sir, which reason mach3 can work only index signal input for spindle feedback regarding lathe threading.

You can use a single input for threading with LinuxCNC
You would connect it to the A and Index input of LinuxCNC
encoder component.

The disadvantage of course is that LinuxCNC is basically guessing the spindle
position between between index signals, so any speed variation in the time between
index signals (say due to varying load) is not accounted for in the Z motion

You could gain a small advantage by using a 1/2 disk rather than a hole since you
could get 2 counts per turn with a small modification of the encoder component.

Thanks for your reply, sir our spindle sensor have only one (Analog/Digital) output so kindly tell us how to use one output into two position (A and index) as per you instruction and also how to configure this in HaL file.