Hand Cranked Siren
by bfabry, published
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It was somewhat arbitrary. my design was loosely based on photos I could find on google images. Thought I believe the changing the number of slots will change the frequency (pitch of the sound) for any given RPM.
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Other parts needed:
(2) 1/4 in. hex bolts 2"
(1) 1/4 in. hex bolt 1.5"
(3) 1/4 in. nylock bolts
(2) SR4 bearings (1/4 ID x 5/8 OD x .196) like these: vxb.com/page/bearings/PROD/SealedBearings/KIt12068
I got all these parts from my local hardware store.
Once you have everything, assembly is fairly straight forward.
update: I added a duplicate small gear as a separate download at the request of a user.
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