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Hand Cranked Siren

by bfabry, published

Hand Cranked Siren by bfabry Jun 4, 2012

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Description

Not a very loud one, but a pretty fun project. See it in action here: youtu.be/V6SdR8xWaw4

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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.

ie: for a given horsepower, size, rpm etc.

Was there any reason for the number of slots, or was it an arbitrary decision? I'm working on a 6" one but there doesn't seem to be much on the web about designing for a specific purpose.

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Instructions

I printed all the parts in ABS on a Printrbot. The gears were printed at 100% fill, though I'm not sure that was really necessary, the rest was at 40%

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.

Comments

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Landru on Dec 23, 2013 said:

Was there any reason for the number of slots, or was it an arbitrary decision? I'm working on a 6" one but there doesn't seem to be much on the web about designing for a specific purpose.

bfabry on Dec 24, 2013 said:

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.

Landru on Dec 23, 2013 said:

ie: for a given horsepower, size, rpm etc.

yzorg on Aug 19, 2012 said:

awesome!

maybe i derivate this to a handcrank fan for bbq purpose

bfabry on Aug 19, 2012 said:

Go for it! I'd love to see a derivative.

TechDante on Jul 3, 2012 said:

ihi i was just wondering if you would get a louder sound if you closed the caing around teh impeller more

bfabry on Jul 4, 2012 said:

Interesting idea, I could give that a try at some point. I was basing my impeller design on photos I saw here http://www.projectresponder.co...

ZORORA on Jun 7, 2012 said:

Here's mine! similar design but mine is powered. I've been thinking about a hand crank siren, you beat me to it.

https://www.youtube.com/watch?...
&
amp;feature=youtube_gdata_player

bfabry on Jun 7, 2012 said:

Awesome! I see now that I need quite a bit more RPM. I wonder if ABS is up for the kind of forces it would get. Don't let my siren stop you, perhaps you can come up with a better hand cranked version!

MacGyver on Jun 7, 2012 said:

I like it, however, I'll like it more when it is louder.

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