507 mechanical movement #5

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This is mechanism 5 in Henry T. Brown's book, 507 mechanical movements.

 

This is like Movement #1 (simple belt and pulleys) but includes a movable tightening pulley. When the tightening pulley is pressed against the belt it takes up slack and transmits power; when it’s not pressed, the belt is so slack that motion isn’t transmitted. 

 

Although in the model the tighting pulley is there, it doesn't really do anything.

 

#5: Original illustration from the book

 

 

How to print: There are two print profiles - AMS print by object and No AMS Single color. If you do not want multicolor, use the No AMS profile. 

 

Printing: Your printer must be well calibrated and have good bed adhesion. If the printer does not have good bed adhesion, the rivets may fail to print. The tolerance is very small to keep the rivets in place, so if your printer is not accurate make sure to apply XY compensation.

 

How to assemble: 

• Lay the base flat on the table
• Take one of the wheels and put it on the top or bottom shaft
• Press the long rivet in (you may need a mallet)
• Repeat steps 2 & 3 for the other wheel
• Put the tightening pulley arm into the shaft in the middle
• Take the shortest rivet and press it in to secure
• Put the small pulley on the arm and press the last rivet into it
• Tie the string tightly around the large wheels (see image 5 as reference)

I hope you enjoy this model!

 

Filaments: Bambu Jade White, Bambu Turquoise, & Bambu Sunflower Yellow.