What Are the Largest Gear Ratios Possible for a Steam Turbine System?

[SimonBuk]

Hi, I'm new to the site so I hope I'm in the right place, I have a question regarding gears for a project that I am working on at uni.

I'm designing a building which has a steam driven turbine at the base, what I want to have is levels above which are attached to the same axle as the turbine but spin a lot slower. The obvious way to run this is to involve a gear system for which I made a model below. This used a simple gear that I took out of a cheap clock. So the model works on a 1:12 Ratio

However, A Steam Turbine can turn at approx 5000RPM, I would like the levels above to turn at a rate of approx 1 rotation and hour, which is about 0.02RPM I think?

Is anything like this possible, its obliviously a massive step down. The building has a 20m diameter so a lot of space is available if massive gears are required. But where do I start with working out how it would work, would a planetary gear system support it?

Any help or advice on this would be greatly appreciated!

Thanks

Simon

 

[FredGarvin]

With a small pinion and a very large internal tooth ring gear, you can get huge ratios. Think of how large things like radio telescopes, radar dishes, hotel rotating floors etc...move.

http://www.strudel.org.uk/blog/astro/images/20050702_wheel.jpg

 

[SimonBuk]

Thanks, found some good info on Radio telescopes. I'm intrigued by the Hotel rotating floors though, have you got any links to anything on those, not sure if I'm searching for the right thing

 

[Lsos]

Worm gears provide some large ratios. This guy set up a worm-gears in series...the input is 50 rpm, and the output is so small, that he encased it in concrete because it really doesn't matter.

It would make a complete revolution in about two trillion years...

/v/5q-BH-tvxEg&hl=en_US&fs=1&[/youtube]

 

[vishal badal]

Hi, I'm new to the site so I hope I'm in the right place, I have a question regarding gears for a project that I am working on at uni.

I'm designing a building which has a steam driven turbine at the base, what I want to have is levels above which are attached to the same axle as the turbine but spin a lot slower. The obvious way to run this is to involve a gear system for which I made a model below. This used a simple gear that I took out of a cheap clock. So the model works on a 1:12 Ratio

However, A Steam Turbine can turn at approx 5000RPM, I would like the levels above to turn at a rate of approx 1 rotation and hour, which is about 0.02RPM I think?

Is anything like this possible, its obliviously a massive step down. The building has a 20m diameter so a lot of space is available if massive gears are required. But where do I start with working out how it would work, would a planetary gear system support it?

Any help or advice on this would be greatly appreciated!

Thanks

Simon

it will depend on the torque required at higher level...cause module is dependent on that...also the shaft diameter will also come into picture...with its cost...i m not getting weather ur asking for a model or for a protocol?