New gears for box joint jig

thingiverse

This adds a 24-tooth gear to my existing 3D printable bevel gear set for Matthias Wandel's screw advance box joint jig. The collection now includes 12 and 16 teeth axle gears, and 24 and 32 teeth cranking gears. Cranking_gear + axle_gear = spacing in inches per 1 turn, 2 turns, 3 turns 32 + 16 = 1/8, 1/4, 3/8... 24 + 16 = 3/32, 3/16, 9/32... 32 + 12 = 1/3, 2/3, 1... 24 + 12 = 1/8, 1/4, 3/8... Note that if your 3D printer bed is too small to print the 32-tooth gear, you can just print and use the 24-tooth gear because the 24-12 pairing gives the same results as the 32-16 pairing. I have updated the rotating crank on my original 32-tooth crank gear with a non-rotating crank. The screw tore itself out of the gear body after about 18 months of use, so hopefully the non-turning fixed crank design will be more durable. Matthias Wandel makes his gears out of plywood, but I find that these plastic gears mesh much more smoothly than the plywood gears I have made given my bandsaw skills. Unfortunately, these gears will not mesh with the other plywood gears I have made. Wandel's box joint plans are available at http://woodgears.ca/box_joint/plans/index.html. While you're on his website, be sure to look at his other offerings.