I set up the chuck rotary yesterday and did not really have any problems.
The only issue was that I have only seen references (from other laser users) to steps per rotation between 4,000 and 10,000.
I did not calculate my steps per rotation, but found it to be 77,000. Can anyone explain why my number would be so much higher than normal and is it something I should be worried about with long term use.
It is a Ruida RDC7132 controller with integrated stepper motor driver
That does seem high!
The manual for your controller says (pages 11 & 12) the axes can have anywhere from 400 to 6400 step/rev, with a “recommended” default of 3200.
What are the DIP switches on your controller set at?
The next questions would be which rotary are you using and how is it connected? The manual doesn’t seem to say anything about connecting a rotary attachment, so there may be something going on there.
DIP switches for S1 (y-axis) is on for 3 and 6. Which is 1.07v and 6400. Not sure why it is at that setting when the manual indicate something else.
I am using the rotary that came with the machine. I unplugged the y-axis directly in the controller and replaced it with the rotary. It was the only place that the plug would fit and the only place that made sense as well with the integrated driver.
In regards to the manual recommending 3200. The machine came with a 42 stepper motor. I believe 57 stepper motor might be normal. Perhaps that explains the setting of 1.07v and 6400
It surely made sense at the time, if that makes any sense. 
The stepper drivers on my OMTech call for 5000 step/rev, so it’s not too different.
Which should eliminate a whole bunch of problems.
The same setup as usual, where the rotary motor must use the same stepper driver current and count settings as the Y axis.
In that case, the “gear ratio” between the stepper motor and the chuck will be 12.03125 = 77000 / 6400. I’d lay big money that should be an exact 12.000, which seems like a reasonable number.
Working backwards gives 76800 step/rev = 6400 × 12. Using that exact value will make the chuck revolve exactly once, which will matter when you want to match the ends of a design around a chonky growler.
If it’s using a toothed drive belt, divide the number of teeth on the motor pulley by the number of teeth on the chuck pulley. If that comes out to 12, there you are.
If it’s using a reduction gear, counting the teeth may be trickier, but the same logic applies. You could mark the back end of the motor shaft and count the motor rotations required to turn the chuck once, although that will be less exact.
In any event, nothing seems out of the ordinary, apart from the somewhat high stepper setting and a large gear ratio.
Burn away!
Appreciate your help. There are 12 teeth on that pulley. It all makes sense now and will be adjusting it to 76800.