Drill Powered Hack Saw

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** UPDATE ** November 2024 I added photos showing the mandrel design that attaches to a drill. The design involves cutting the bolt head from a 1/4-20 bolt, and grinding partial "flats" on either side of the threads to create a "square" part of the bolt that fits through the square slot in the drive gear of the mechanism. Two washers are installed with the same diameter of the drive gear, along with 2 split lock washers, and 2 nuts. Also copious amounts of Thread locking compound. The theory of operation is to have multiple means by which to fix the mandrel to the drive gear: (1) mechanical square slot, (2) compression of drive gear between 2 flat washers, (3) use of lock washer to prevent unscrewing of lock nuts, (4) use of thread locking compound to fix nuts in place when dry. I needed to cut a 2x4 stud in my wall, and had tight clearances. The stud spacing was 16 inches, but my Bosch Sawzall would not fit, so I designed this reciprocating gear-driven adaptation to work with a hack-saw blade, and a portable screw gun. Printing: 20% Infill 0.2mm layer height 0.4mm nozzle PETG Assemble with white lithium grease, or your choice.