Parametric Knuckle Block

thingiverse

As of January 2nd, 2014, improvements were made to the knuckle block design for Robohand. Firstly, a parameter was added to adjust finger spacing for a custom fit. Secondly, options for standard button head screws instead of specialized long bolts or threaded rods were included. Nut traps in end slots can hold M4 jam nuts with two button head screws passing through for locking. If space is limited, M4 threads can be tapped into the ends to utilize the entire knuckle block as a trapped nut. However, be cautious not to over-tighten screws in this case. The updated version has been tested successfully with 40mm M4 button head screws and captive M4 jam nuts, proving both secure and mobile fingers. This is a configurable parametric version of the knuckle block, adaptable for various hardware sizes and slot widths for better proximal part fitment. A support option is available to improve print quality. The design is still considered work in progress and carries no medical warranties; consult a physician when using it. To utilize, customize values in the .scad file's PARAMETERS section for scale, hole sizes, slot width, and support options before compiling with OpenScad. Export as an STL, repair it in Netfabb, and slice for printing.