DT - key definitions
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33 Terms
Q: What is the driver gear?
A: The gear that receives power and causes other gears to turn.
Q: What is the driven gear?
A: The gear that is turned by the driver gear.
Q: What is an idler gear?
A: A gear placed between driver and driven to change direction without affecting speed.
Q: What is a gear ratio?
A: The ratio of the number of teeth on the driven gear to the driver gear.
Q: What does a high gear ratio mean?
A: Greater torque
Q: What is a cam?
A: A rotating shape that converts rotary motion into reciprocating motion.
Q: What is a follower?
A: The part that moves up and down in response to the cam's shape.
Q: What is dwell in a cam system?
A: A period where the follower does not move.
Q: What is rise in a cam system?
A: The upward movement of the follower.
Q: What is fall in a cam system?
A: The downward movement of the follower.
Q: What is a worm gear?
A: A gear system where a screw (worm) turns a gear wheel at 90° angle.
Q: What is one key feature of worm gears?
A: They are self-locking and prevent back-driving.
Q: What is linear motion?
A: Movement in a straight line.
Q: What is rotary motion?
A: Movement around a central axis.
Q: What is reciprocating motion?
A: Repeated back-and-forth movement in a straight line.
Q: What is oscillating motion?
A: Swinging back and forth around a pivot point.
Q: What is a frame structure?
A: A structure made from a skeleton of joined parts (e.g.
Q: What is a mass structure?
A: A structure made from solid material (e.g.
Q: What is a shell structure?
A: A hollow structure that is strong due to its shape (e.g.
Q: What is triangulation in structures?
A: Using triangles to make structures rigid and stable.
Q: What is a gusset?
A: A plate used at joints to strengthen and support structural frames.
Q: What is tension?
A: A pulling/stretching force.
Q: What is compression?
A: A pushing/squeezing force.
Q: What is torsion?
A: A twisting force.
Q: What is shear?
A: A force that slides one part of a material past another.
Q: What is bending?
A: A combination of tension and compression.
Q: What is a static load?
A: A constant
Q: What is a plain bearing?
A: A simple bearing surface with no moving parts.
Q: What is a ball bearing?
A: A bearing that uses balls to reduce friction between moving parts.
Q: What is the main difference between oil and grease?
A: Oil flows and cools well; grease clings and is better for heavy loads.
Q: What is lubrication used for?
A: To reduce friction and wear between moving parts.
Q: What is a ratchet and pawl?
A: A mechanism allowing movement in one direction only
Q: What is a moment (torque)?
A: The turning effect of a force: Moment=Force×Perpendicular Distance