Excuse me I am not so much good in programming....
so it has to be 360.0...
thanks
No, you have an int in the code in post 40:
So I ask again - are you trolling?
With a 10 tooth pulley on a 200 step motor, a 72 tooth pulley on the chuck would give you 1/4 degree steps, a 90 step, 1/5 degree. With a 400 step (1/2 step) and 36 or 45 teeth on chuck would give 1/4 or 1/5.
My profound apologies.... i have seen so much text... it is now working 360 degrees correctly.. 
can I do anything else to increase accuracy?
Not possible with your current setup.
Your resolution is 360º / (400 x 6) = 0.15º
So it's not possible to move in 1º increments
7220 steps will give exactly 1 degree )))
Changing the motor or adjusting the stepper driver would offer this possibility?
My stepper driver can microstep to 32 /6400 pulses per rev
Yes
It is easily divided into 50 parts, exactly 48 steps each
107 steps at 6400 microstep will give 1.003125 degrees, is 3 microns normal for your mechanics?
that would be adequate
rebuild the driver to microstep and check
1 degree would be 106 2/3 steps, how would you do two thirds of a step?
Where does microns come in, what is the circumference of the table?
38400 (6400 * 5) - 360
107 - X
x= 107* 360/38400 = 1,003125
I agree, microns are not 3/1000 of a degree
I have a Tb6600 Stepper driver which can adjust to 32 microsteps (6400 pulses per rev) but my motor is a 1.8 deg stepper.
So check how it works on microstepping.
What is the diameter of your table? Does it have some type of clamping device to lock the table during work?
NO it does not clamp but I can modify it if required or devise a pneumatic brake.
I am reading a subject on stepper motors...