HSL Projects: Difference between revisions
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** 600 hz / 5:1 gear = 120 holes. | ** 600 hz / 5:1 gear = 120 holes. | ||
** 600 hz / 5:4:1 gear = 30 holes (18 holes undertone). | ** 600 hz / 5:4:1 gear = 30 holes (18 holes undertone). | ||
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Revision as of 23:54, 6 September 2022
Air Raid Siren
- DIY Dynamic Flywheel Balancing
- https://www.youtube.com/watch?v=SkqCBcPGDEE
- TL;DW: mount it in a lathe with 3 weight attachment points, measure wobble, move weights, measure wobble, repeat till fixed.
- Wooden Example
- https://hackaday.com/2013/03/31/building-a-wooden-air-raid-siren/
- 6 hole, 10 hole, two pitches.
- 600 hz is a good rough upper limit for the high pitch
- 600 hz / 10 holes = 60 rps / 3600 rpm
- hand crank can produce about 1 rps
- 600 hz / 5:1 gear = 120 holes.
- 600 hz / 5:4:1 gear = 30 holes (18 holes undertone).