Question about gearing Answered
Hi everyone. I've been a long time lurker, and I love the site. I've learned so much just by coming here. I've just registered to say you have inspired me to take on a project of my own.
I've sort of hit a bump in the road, though.
I have an idea for a clock. I want to do a steam-punk flavored wall or desktop clock with exposed brass gears and various and sundry bits I have laying around.
I want to tack the numbers directly onto the gears and use them instead of hands. So one large gear on the left with the numbers 1-12 in place of an hour hand, one large gear on the right with 00-55 by fives for the minute hand and a gear under the two that counts off the seconds.
So, if I can get a motor downgeared to 1 rpm to drive the "second gear" I'd need a 60:1 gear ratio to make the "minute gear" accurate, and then 12:1 off of that to do the "hour gear."
I know I can't drive them all directly off each other, because that would make the "Second Gear" tiny and the "Hour Gear" huge.
Where I'm stuck, aside from my poor math skills, is how to get the ratios right and size of each intermediate step and number of teeth, etc.
I don't know enough to tell if I'm in over my head, but it seems "do-able" from my perspective. I'd appreciate any feedback you all could give, even if it's just a link to a tutorial that will get me started. I'm not on a deadline or anything, I just found the urge to make something cool.
I have a bit of a budget if I need to have something custom fabricated, but I'd prefer to do as much of it as I can. I wouldn't mind using off the shelf stuff like bicycle gears or similar, because I could always have them engraved and plated and made to look cool.
So, any help or nudges in the right direction would be appreciated.
Thanks in advance, and thank you for such a wonderful site/community.
**edited to add***
Of course I'd be delighted to write an instructable about it when It was done. It would only be polite. ;)