.0004 precision in a stepper system????
Speaking of the Chinese lasers only...
OK I doubt very seriously that a stepper system can reproduce anything close to .0004" repeatability. It has no feedback in the system thus your errors can never be corrected by the machine so the very best accuracy you will ever get is dependent upon the precision of the drive system and the resolution of the system.
I would bet that .005 is more real yet I doubt that any of these stepper systems can duplicate that.
Pete
Chinese Rabbit Laser HX6090 (60 watt) Happy with it!
FANUC CNC (ROBODRILL / TAPE DRILL MATE) 0MC control