Project on Rotation V's Revolution

[melissa]

I need a cool project that explains rotation v's revolution. I have to present this to my teacher and it will be in a science show case. I don't want to do the same thing with the earth and sun ect. I want something differet. I am in the 7th grade and it is an honors class. If anyone has any suggestions I would appreciate it... Thank you : )

[thief]

Thief here...

I'm a toolmaker.

In my work it needed to figure the rotation of the material as compared to the surface.

On a lathe, the workpiece rotates as the tool moves down the length.

( a lathe makes things round)

If the work spins too fast the tool bit will heat up and fail.

If the work is turned too slow.... the boss will heat up.

Cutting speed is written in feet per minute.

I must do the numbers to know rpm (rounds per minute).

I must use pi, for the calculations.

For example

A 6 inch diameter will have approximately 18 inches circumference.

Circumference times, rounds per minute, equals feet per minute.

Don't forget to convert inches to feet as you go.