Build Blitz Robot Reveal - Team JVN

[Kellen Hill]

Aren had told me the other week that they milled a couple of grooves into the face of the gear (after milling the face of the gear flat to avoid contact with the choo-choo linkage). They then drilled a hole through the hex shaft and used a roll pin to retain the gear by using the grooves milled into the face of the gear.

[Aren_Hill]

Originally Posted by Kellen Hill

Aren had told me the other week that they milled a couple of grooves into the face of the gear (after milling the face of the gear flat to avoid contact with the choo-choo linkage). They then drilled a hole through the hex shaft and used a roll pin to retain the gear by using the grooves milled into the face of the gear.

Yup, milled the boss flat, then put a roll pin through the end of the HEX shaft ~1/16th from the end. Then just milled a flat pocket just wide enough and deep enough to completely hide the roll pin.

With access to more screw sizes I likely would've just drilled and tapped the end for a large countersunk screw that was over 1/2" diameter to retain it.
A snap ring and counterbore would also work.