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I've been keeping a list of weird pencil sharpening ideas for several years so I finally decided to build the coolest ones! This was a lot of fun and a neat way to make a variety of mechanisms grounded in a problem that everyone understands. 

Your support enables me to make things like this, so thank you! :) There were a lot of challenges and things that didn't make it into the video so I'll be doing a patron only directors commentary livestream in the next week or so to expound on them. I'll post the details as soon as I nail down the time. 

Hope you enjoy it!

- Shane

Files

Six pencil sharpeners that would get you expelled

Head to https://brilliant.org/StuffMadeHere/ to start your free 30-day trial, and the first 200 people get 20% off an annual premium subscription! Create a FREE Onshape account at: https://Onshape.pro/StuffMadeHere and get the free design files for the Pantolathe: https://tinyurl.com/pantolathe I hope you find this to be a neat example of different ways to solve the same problem.

Comments

Drendude

I'm glad you did end up getting the explosion to work! I was certain it would not.

Nikolaas Noyez

👍🏻 no point in delaying it too long.

Bruce Burkhalter

Seeing your joy when the pantograph worked was really sweet. So many time you are in the "fail / fix" loop and it just looks crushing. Nice to see it just work. 🙂

Gary Cohen

Congrats on the new baby.

Sonja Black

This is definitely one of your more entertaining and hilarious videos.

NotMyRealName

Kind of surprise you didn't try rubbing a pencil against another pencil. They should wear each other away at roughly equal rates, right?

Jonas and Aistė

I do enjoy your videos, you make it so easy but I know it's hard to do. Have you ever thought of making a Turing machine?!

George Sopp

How about the sun and a magnifying glass?

Modern Chili

This was a fun video! Wow this water cutter has so much power!

ImMovingWheels

I was giggling so hard during the explosion section, would've laughed out loud but I didn't want to disturb everyone in the house

Carlos Vidal Wagner

Very cool. The car pulled sharpener is pretty amazing that it actually sharpened soo well!

Barry

First Class engineering silliness!