ME425 Design of Machine Elements II Exam 2-
Questions with 100% Correct Answers| Verified-
Define Conjugate Action - ✔✔Surfaces roll/slide against each other to produce a
constant angular velocity ratio
Force is transmitted between curved surfaces through the tangent line: - ✔✔Line Ab
Line of Action
Where is the point of contact between gears - ✔✔The pitch circle
What is interference - ✔✔Contact of tooth profile is not conjugate
What is undercutting - ✔✔Removing interfering portion which weakens tooth
What is the standard pressure angle - ✔✔20 degrees
What is the second most common pressure angle - ✔✔25 degrees
What does a helical gear have that a spur gear does not - ✔✔A helix angle
Of the types of gears there is:
Spur
Bevel
Helical
, _______________ - ✔✔Worm GEARSETS
What is the Lead - ✔✔The distance traveled laterally per rotation
For spur gears where does the reactions occur - ✔✔Along the pressure line
Where is the pressure line - ✔✔Tangent to the circle of both gears
Where is the base circle - ✔✔Where the involute profile starts
What type of motion does a spur gear have - ✔✔Rolling Motion
What type of motion does a worm gearset have - ✔✔Sliding Motion
How can you increase the efficiency of a worm gearset - ✔✔Increase the lead angle
If the velocity of a worm gearset increases what happens to friction - ✔✔Friction
decreases
In the following order, what is the subscript for axial, normal, tooth, piñon, gear and
pitch - ✔✔x, n, t, P, G, p
What equation is used for stresses due to transverse loads (Think beam bending) -
✔✔Sigma = (M*c)/I
What is the formula for moment of inertia of a rectangular beam - ✔✔I = (1/12)bh^3
Questions with 100% Correct Answers| Verified-
Define Conjugate Action - ✔✔Surfaces roll/slide against each other to produce a
constant angular velocity ratio
Force is transmitted between curved surfaces through the tangent line: - ✔✔Line Ab
Line of Action
Where is the point of contact between gears - ✔✔The pitch circle
What is interference - ✔✔Contact of tooth profile is not conjugate
What is undercutting - ✔✔Removing interfering portion which weakens tooth
What is the standard pressure angle - ✔✔20 degrees
What is the second most common pressure angle - ✔✔25 degrees
What does a helical gear have that a spur gear does not - ✔✔A helix angle
Of the types of gears there is:
Spur
Bevel
Helical
, _______________ - ✔✔Worm GEARSETS
What is the Lead - ✔✔The distance traveled laterally per rotation
For spur gears where does the reactions occur - ✔✔Along the pressure line
Where is the pressure line - ✔✔Tangent to the circle of both gears
Where is the base circle - ✔✔Where the involute profile starts
What type of motion does a spur gear have - ✔✔Rolling Motion
What type of motion does a worm gearset have - ✔✔Sliding Motion
How can you increase the efficiency of a worm gearset - ✔✔Increase the lead angle
If the velocity of a worm gearset increases what happens to friction - ✔✔Friction
decreases
In the following order, what is the subscript for axial, normal, tooth, piñon, gear and
pitch - ✔✔x, n, t, P, G, p
What equation is used for stresses due to transverse loads (Think beam bending) -
✔✔Sigma = (M*c)/I
What is the formula for moment of inertia of a rectangular beam - ✔✔I = (1/12)bh^3
