I’m new to all this but I’ve built a (Working in metric) a 1.2m X1.2m overhead gantry router using 20mm linear bearings and RM2005 ballscrews from linearmotionbearings2008. It’s going to be for a hobby cutting 12mm ply making mail boxes ( Art Buy Post - Home ). I purchased from Wantia motors 4 PCS Nema 23 Stepper Motors with 290oz-in holding torque,1A,single shaft
4 Axis TB6560 Stepper Motor Driver Controller
Aerospace TB4-axis drive board HY-TB4DV-N Instructions
Products Features ：
Integrated SCM manual control system, you can directly from the computer manual
The maximum 3.5A drive current to a maximum 86 stepper motor drives, more powerful
16 sub-setting, higher accuracy, smoother operation
Overload over-current over-temperature protection, full protection of your computer and peripheral equipment
4 files current settings can be set according to the user the actual current requirement
Full closed-type optical isolation to protect the user's computer and equipment
Professional design, two-stage signal processing, super anti-jamming
Bipolar constant current chopper drive motor low-speed non-creeping phenomenon, noise, non-resonant region。
2-way output control, scalable fifth axis or 2-way control of external equipment.
Four input control, you can set limit, emergency stop, which is divided
200W ,24VDC,8.3A Power Supply
Bench testing and tuning the motors in Mach3 I have dip switches at 1/8 step, full power, fast decay which by my calculation with my 5mm ballscrew in mach3 motor tuning the step per set at 320? I’m presuming the Step per is steps per mm not steps per revolution.
With that I can’t seem to get the velocity more than 600 to 800mm/min ( slow) without the motors stalling.

My question is am I doing something wrong or is my economically fiscal methodology flawed (I have a tight budget by necessity not personality) is this the best I can expect from the cheapest thing I could find on ebay?
Your input will be much appreciated.
Mark