Gears and Gravity, Day 3: Pinion Construction I

Center Punching

Center punching the pinion pin holes. I am impressed by how accurately these 4th, 5th, and 6th graders can punch these center marks. They did better than many college students I’ve seen. Perhaps their small hands and young, sharp eyes give them an advantage.

After Day 1, I knew that this group of students would benefit from the additional challenge of drilling their own holes. I drill all of the 3/8" holes for safety concerns but I'm confident that the risks of injury when drilling an 1/8" hole into chip board are minimal. Everyone has handled the drill press very well so far.

After Day 1, I knew that this group of students would benefit from the additional challenge of drilling their own holes. I drill all of the 3/8″ holes for safety concerns but I’m confident that the risks of injury when drilling an 1/8″ hole into chip board are minimal. Everyone has handled the drill press very well so far.

Cutting 1/8" dowel rod into 3/4" lengths for pinion pins using a custom jig. The Xcelite 170M flush cutters do a pretty good job and fit young hands very well.

Cutting 1/8″ dowel rod into 3/4″ lengths for pinion pins using a custom jig. The Xcelite 170M flush cutters do a pretty good job and fit young hands very well.

Each plate is a double thickness of cereal box chip board plus a paper pattern all spray-mounted together. The average thickness of this material is 40 mil so it's a bit of a challenge to cut through.

Each plate is a double thickness of cereal box chip board plus a paper pattern all spray-mounted together. The average thickness of this material is 40 mil so it’s a bit of a challenge to cut through.

We often emphasize the importance of cutting parts to a rough shape first and then trimming the last bits off.

We often emphasize the importance of cutting parts to a rough shape first and then trimming the last bits off.

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