For the voind robot project we are using nearly two dozen screw references, mixing types (DIN 7984, 912) and sizes (M2 to M5, 6 to 35 millimeters lengths).

The screw types and positions were established during the design phase taking into consideration the dimensions of the parts, the forces involved, the clearances for the screw heads (and nuts) and also how to reach the screws during assembly and maintenance.

Most of times the screws had mating threads cut into one of the parts using a manual tap.

Some tap operations proved to be very challenging, specially when cutting M3 threads into stainless steel beams and in particular the one where we could not use a tap handle due to the part geometry:

In the end we assembled quite an impressive array of screws, nuts and washers references!