3d Watch Mechanism D&D Plot Device.

[Robbie]

I just figured out the 1:2 as you wrote that...10 tooth to 20 tooth no matter what the scale always matches up at 1:2

The formula is -2*Z_Rotation for smaller gear having half the teeth...

so whats the proper math for say 13 to 21 then?

Its not (-1*(21/13))*Z_Rotation apparently

Edit: I just made a 11 and 21 gear ratio...calculated by hand as 1.9090909090~...
Punched in -1.9090909090*Z_Rotation, and it worked (but started to get off after about 30 rotations by a very small amount...thats still a result...

BUT...when I tried (-1*(21/11))*Z_Rotation I get bunk...so I think maybe my parentheses are off?

[ravells]

I'm just a lawyer. I just know how to add a zero on the end of a bill, sometimes two.

[RPMiller]

I just figured out the 1:2 as you wrote that...10 tooth to 20 tooth no matter what the scale always matches up at 1:2

The formula is -2*Z_Rotation for smaller gear having half the teeth...

so whats the proper math for say 13 to 21 then?

Its not (-1*(21/13))*Z_Rotation apparently

Edit: I just made a 11 and 21 gear ratio...calculated by hand as 1.9090909090~...
Punched in -1.9090909090*Z_Rotation, and it worked (but started to get off after about 30 rotations by a very small amount...thats still a result...

BUT...when I tried (-1*(21/11))*Z_Rotation I get bunk...so I think maybe my parentheses are off?

No, your parentheses are correct. I do the math as written and get -1.9090~*Z_rotation

[Robbie]

Well, I've created more gears, and now that I know how to wire them together (and given that I'm probably going to be working primarily with 8 to 1) I've placed them where I want them to be for this device.

Even though it looks like a clock mechanism, which the mechanism is...its actually going to be a key. The small pinion gear on the top in the center is going to be the key to unlocking the Great Orrery and lead the PC's to the right places to begin to set the divine moons back to right.

Basically, the clockwork mechanism will be powered by the magic crystal, the crystal is attuned to the Divine Essence of the gods (moons) and pulses in time with the heartbeat of the Primary deity. Since thats currently not right, this key will allow the Orrery to position itself into the current "incorrect" position. Since once the moons started drifting out of alignment the sages and keepers of the Orrery shut it down since they could no longer track things.

Sorry about the stream of consciousness...I'm just planning my next few campaign sessions

Whatcha think? (Other than the gears not all quite lining up yet, will work on that soon)

[RPMiller]

Very nice and I like the back story. Very creative.

[Robbie]

Its coming along...I've moved things around a bit...lined up the gears better so the teeth fit each other. The crystal is glowing now. I've given it a very early version of the housing. The big gear above the escape wheel is going to be the gear that interacts with the Orrery...though I'm thinking of making that the gear at the end of the chain (bottom of the balance wheel)...

Note also the jewel action can be better seen, and I added a balance spring.

[Robbie]

Moving this thread to GD to get more feedback...Sorry guys

[torstan]

That's looking extremely cool, and I'd agree with RP - I love the backstory.

Good work.

[Robbie]

Thanks! I'll probably be whipping out some more backstory as I get its functionality finalized...I'm thinking about changing the crystal to be part of the link up to the Orrery...so it would have a piece of crystal sticking out and a gear sticking out.

[ravells]

That's looking really beautiful, Robbie!