Threading on Sherline lathe

I am trying to do threading on a Sherline lathe. Here is a list of my equipment.

2 Leadshine em 705 stepper controllers
1 Pmdx 122 Bob
Omron quad. Encoder and channels
Parport built in that does spp, epp, ECP
Dayton 2m139 spindle motor
Linuxcnc 2.7.8
2 AMT dual shaft 156 oz-in stepper motors.

First question is do I have everything I need or is a vfd needed?
If so what will work with this motor? It is 165 watts.

You shouldn't need anything else.

Have a look here: forum.linuxcnc.org/26-turning/30181-sher...rsion?start=20#86760

The lathe is trying to thread but it is still not synching correctly because I had set the program to do 4 tpi and it looked like 80 tpi. I will upload my Hal and ini files here today. My latency is like 19500 me if that helps. All help appreciated.

Does motion.spindle-revs increase by 1.00 if you rotate the spindle forwards by hand?

4tpi on a Sherline seems ambitious. Are you sure that the Z axis can move fast enough to follow a 4TPI thread at the selected spindle speed?

Yes the it increases by one on the halscope when I turn it by hand.