Although I cannot state the questions, which I don’t know for now, I may be able to emphasize some details in Lab 4: Reverse Engineering. This lab is basically all about the gears and the gear trains. So, there we go, there are two types of gear trains: simple and compound gear trains. The simple gear train means that all the gears are in the same line, and compound gear trains are not. If there are three gears in a simple gear train with radii of R1, R2, R3, the gear ratio = (R2/R1)*(R3/R2), and the velocity ratio is (R1/R2)*(R2/R3), in other words, gear ratio = 1/ velocity ratio. Similar for compound gear train; the only difference is that in the compound gear train the radii to put into the formula have to be connected to each other.
Then there are 6 major gears:
- Rack gear: change rotation to linear movement
- Crown gear: change the direction of the movement perpendicularly
- Spur gear: transmit the torque through the gear train
- Worm gear: same purpose as the crown gear
- Idler gear: does not change the velocity ratio
- Pulley gear: transmit rotation from one point to another
And finally there are two formulas:
- F = m * a
- T = F * D
Physics 101. Easy stuff.
