The following is a list of preliminary specifications for the new robot:
70x80x80mm (X,Y,Z). We reduced it considerably to an Arduino Shield size. In fact sometimes we call the robot “The Arduino Shield Maker”. We reduced it because we preferred to do something small but precise. Rarely all of we create big circuit boards but if you need it you can always split the circuit in two or more modules. Reducing the working area has some advantages: the robot is cheaper, more precise, robust, smaller and more manageable.
MKII is powered by three Nema 17 motors and Acme screws. We substituted the timing belts we used in MKI in order to eliminate vibration and resonances. It was mainly the solution and now the laser draws on the PCB with a stable beam without any mechanic disturbance.
We can go as fast as 1200-1500mm/min. We think it’s enough for our purposes. The Acme screw pitch set the limits. The robot can go faster upgrading the screws to ones with more pitch but at a price.