A neoprene fender washer was cut with a
standard paper hole punch. One circle was made which had the original
3/32” hole so a small neoprene washer was created and a a 1/4” ID
neoprene was left. Three more 1/4” diameter discs were made using
the neoprene washer and hole punch.
Punching a neoprene washer
Pieces punched from neoprene washer
A 1/4-20 brass bolt was purchased and
the head was cut off using a band saw. The cut end was smoothed on a
belt sander. A piece of 9/32" ID aluminum tubing was cut with a pipe cutter.
The length was based on the length of the brass bolt, compass
spinner, plug, and an extension spring which still needed to be
constructed. The cut pipe was reamed with a phillips screwdriver
which had a 9/32” diameter shaft.
Aluminum pipe and components to go inside
Cut pipe next to components
Pipe being reamed with screwdriver
The thin brass rod was tightened
between two nuts on a #4-40 threaded rod. The brass rod was tightly
wound into the threads of the #4-40 threaded rod. The resulting
spring was trimmed on one end.
Tightening brass rod between two nuts
Spring wound on #4-40 threaded rod
Shaping an end with needle-nose pliers
Trimmed spring
The 1/4-20 brass segment had solder
applied to the cut end. The newly wound brass spring had the trimmed
end tinned with solder. The spring and threaded brass segment were
joined so the heavy mass could hang by the spring.
Solder on ends of brass pieces
Bolt piece hanging from spring
Assembled components next to aluminum tube
The magnet did not spin as freely
inside the aluminum tubing which is possibly due to the induced
current of the moving magnetic field. This effect can be observed by
dropping a powerful magnet through a metal tube. It will fall much slower than gravity would suggest. Information can be found by researching Lenz's Law but the short story is that as the magnet moves by metal it induces a small current and electromagnetism is a direct result of current so the magnet will hug the metal and create friction.
- Wrap longer spring with fine brass wire
- Test + Evaluate longer spring design
- Build tubular compass
- Test + Evaluate tubular compass
- Redesign, Rebuild, + Repeat
Journal Page
The rest of the posts for this project have been arranged by date.
A list showing of all the final posts of COMPLETED projects.
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