Voyager2's Robot Fish

[voyager2]

Hi All,
I've been researching different ways of propelling my fish, all 4 of my electromagnet attempts have failed, and instead I'm going to use a servo.
I have therefore emptied my money box to buy this little guy from a local hobby shop:


HS-65HB Mighty Feather servo.
Came with 2 extra horns and 4 screws for mounting, a good $28 spent!
Haven't powered it up yet but apparently it can supply 2.2kg-cm @ 6v 

[Joker94]

That servo when used properly is great quality. it is popular at the model aeroclub i am a member of. it is commonly used in small nitro planes with great results.

What are your plans for this drive systems?

looking forward to seeing the design!

[voyager2]

I'll upload a CAD later but the general idea is that a little piece of solid core wire is threaded through a hold in the horn, that bit of wire is attached to a lever that drives the tail.

Since its so small I'd love to see a continuous rotation mod for it...

[Joker94]

I have heard that they can be a bit temperamental. the most important thing to take into consideration the structure of the gear. just because of the size they become a lot harder to work with. but if you do it bit by bit with a file or something similar and put little stress on the servo then you shouldnt have a problem.

have a look in the memebrs tutorials section as i think there is a tutorial on how to mod a micro servo like yours.

Good luck

[voyager2]

I'd never really need to mod it, just thought it would be cool to see one modded

Here's the CAD I through together:
http://www.filesend.net/download.php?f=fc8a0ad02db64c03bb20be6f2bd983c5
The servo is over-sized, and the little wires coming out of the horn are not quite right.
The little "plate" on the end of those wires is hinged (that wire/rod thing is the pivot) and the tail is attached directly to it.

[Joker94]

it all looks good, looking forward to seeing the build.