Embedded Files
Computer Aided Design
Computer Aided Design
Give a summary of your CAD (escapement wheel and pendulum) and what motivated your design. Mention which parts of the design are fixed, and which one were free for design. Mention the trade-offs you made to make sure your pendulum design could be manufactured and has it Center of Gravity below its rotation point (well-balanced)
The final product of the pendulum design was a large ship connected to the pendulum, with the concept of mimicking the movement and swaying of the ship during ocean a maritime voyage. Intended originally to look like the front of an Arleigh Burke-Class Destroyer, the outline was edited and the etching was changed due to the extreme complexity of the design. Most notably, the deck gun, CIWS turrets, and AN/SPY-1 Radar (large angled hexagonal piece) were removed, although most other elements were kept. This greatly simplified the design, although the CAD model remained complex. Every piece with the single exception of the pendulum is made uniform in order to streamline the process and avoid unnecessary complications. The pendulum itself has a required attachment of two prongs that will be powered by the escapement wheel, in addition to a hole that will be connected to the upright via a short shaft and secured with spacers. The design of the pendulum, sans the arms that would power the escapement wheel, was free for design, provided that it fit within a 5"x8" box. The escapement wheel was fixed, as the efficiency of the mechanism was depended on the shape, leaving little room for customization.
While the outline of the pendulum is relatively simple, the etching required to capture the full front of the ship was exceedingly complex. Consisting of hundreds of lines and shapes, the design traded aesthetic grandeur with extremely complex and impractical technical requirements. The complexity of the design resulted in much greater difficulty compared to other projects, and the excessive detailing resulted in many difficulties, outlined in the Challenges section of the webpage. In order to ensure that the center of gravity was well below the rotation point, even with the large teeth in the escapement wheel, the boat was built as wide as possible in order to maximize the mass below the rotation point.
Machining and Physical Fabrication
Machining and Physical Fabrication
The process of manufacturing the physical stand of the pendulum involved a series of manufacturing techniques that culminated in a complete stand, only requiring the addition of the escapement wheel and pendulum in order to function. The pendulum was created in the following order:
4 #10-32 clearance holes were drilled into the Bracket piece in order to allow for the Upright to sit perpendicularly with the Base piece. While #8-32 was needed for a hole for the upright, misalignment in the drilling led to a larger hole becoming necessary for the hole to move.
Burrs were removed from the the long shaft, short shaft, and bracket with a file in order to avoid sharp edges when assembling the pendulum
The base was already drilled with 2 #10-32 holes, with only a countersink to accommodate the flat head screws necessary
A long bearing and short shaft were press fitted into the upright using an arbor press
A 4-40 hole was drilled into the pulley clamp
The central hole of the pendulum was reamed and a short bearing press fitted.
Both holes by the central hole on the escapement wheel were tapped with #4-40 threads
8 Screws were added to the pendulum
All spacers, flanges, clamps, bearings, and clips were added onto the shafts, completing the pendulum.
String was tied around the pulley and attacked to the 3d printed nut, which contained bolts already attached.
The clock was completed and tested, with an escapement wheel replaced, allowing for a functional pendulum
Final Result
Final Result
Fusion 360 CAD
Fusion 360 CAD
Physical Pendulum Design
Physical Pendulum Design
Page updated
Report abuse