Some Hints for Building
A strong and light structure. Doesn't bend easily.
This way the axles turn more easily.
A clutch. The pipe keeps the axles in line.
A permanent joint.
Another permanent joint.
Use a "very hard joint" when you want the parts to stay together during the pull-down of the ride (see Himalaya).
Why to open a turntable?
- To lubricate it. Silicone grease is good for plastic (see Flying Circus).
- To screw nuts and screws when studs don't hold strong enough (see Chaos and Tornado).
- To build a revolving electricity joint inside (I haven't tried that yet).
You can decrease the speed of the axle by using the inner cogs of a turntable.
This way you can hide an axle inside a beam.
An adjustable angle.
A revolving electricity joint made of circuit board.
An easier revolving electricity joint.
A revolving pneumatic joint.
Some technical data about 9V LEGO-motors.
- Current on idle 6 mA
- Maximum current before the cutout 85 mA
(The motor cuts out the power when the current
rises too high.)
- Speed 4200 rpm (rounds per minute)
- Inner resistant 15 ohms
- Current on idle 48 mA
- Max current before cutout 400 mA
- Speed 350 rpm
- If you don't use this motor for a long time, it may
stuck and never work again. Spin it at least every two
months to keep it "alive".
All these lego-motors are too fast and too weak to spin a ride alone.
Well, a micromotor (the red one) can turn a small and light ride.
You can control the speed and make the motor turn slower by a train transformer.
However it doesn't make the motor any stronger, only weaker.
You have to use gears to make the spinning slower and stronger.
An example: In a turntable there is 56 cogs (=teeth). Use the motor to turn a
8-teeth gear and put this gear in touch with the turntable. Now when the motor
makes 7 turns, the turntable makes only one (56/8=7). At the same time it
is 7 times stronger.
You can then put the motor turn 8-teeth gear which touches a 24-teeth gear.
Then put a 8-teeth gear on the same axle with the 24-teeth gear and make it turn a turntable.
This way the turntable is 21 times stronger than the motor (24/8*56/8=3*7=21).
The speed of the turntable is now 16.7 rpm (350 rpm/21=16.7 rpm)
The maximum speed of a Superbowl is 17 rpm so this is a good gearing for the Superbowl.
When a smaller gear turns a bigger one, it is slower and stronger.
When a bigger gear turns a smaller one, it is faster and weaker.
When there is 3 or more gears in a row (=all on different axles), the middle ones don't count.
Only the sizes of the first one and the last one matters.
Hinge for the background picture. The instructions here.