Belts test - Millwright level 2 Exam Questions
With Verified Answers Graded A+
High capacity V-Belts
-Also called wedge, hi-torque, or narrow v-belts
-The three sizes are 3C, 5V, & 8V. Meaning they have 3/8", 5/8", and 8/8" (1") of top width.
What does 3V2550 indicate?
3/8" width and 25" pitch line length,
What does 8V550 indicate?
8/8" = 1" and 50" pitch length, V= V-belt
What does 3V3550 indicate?
3/8" and 35.5" pitch length, V= V-belt
What does 3L indicate?
3/8" Light duty V-belt
Effective Tension
Needed on the belt to transmit power without slipping. Driver pulls on the belt making a right side
and a loose side
Installed tension
On the belt when the drive is not running, kick the belt before working on it to release the tension
Pitch Diameter
All pulley speeds and ratios are calculated from this ________ of the sheave and the pitch line of the
belt.
High-Capacity vs Classical V-belts
HC are preferred over Classical for new designs because the narrow wedge design provides more
support for the tensile members. HC are available in clogged raw edge designs, Eg: 3VX, 5VX.
Power Band/ Banded Belts
Also called joined classical belts. Constructed by joining two or more standard belts with a common
backing. Developed to solve problems of belt vibration, whip, and turnover
Flat Belt Pulley Width
The width of a new flat belt is determined by the width of the narrowest pulley. Generally the pulley
face should be:
-1" wider than the belt (for pulleys up to 6" wide)
-2" wider than the belt (for pulleys over 6" wide)
Flanged pulleys
With Verified Answers Graded A+
High capacity V-Belts
-Also called wedge, hi-torque, or narrow v-belts
-The three sizes are 3C, 5V, & 8V. Meaning they have 3/8", 5/8", and 8/8" (1") of top width.
What does 3V2550 indicate?
3/8" width and 25" pitch line length,
What does 8V550 indicate?
8/8" = 1" and 50" pitch length, V= V-belt
What does 3V3550 indicate?
3/8" and 35.5" pitch length, V= V-belt
What does 3L indicate?
3/8" Light duty V-belt
Effective Tension
Needed on the belt to transmit power without slipping. Driver pulls on the belt making a right side
and a loose side
Installed tension
On the belt when the drive is not running, kick the belt before working on it to release the tension
Pitch Diameter
All pulley speeds and ratios are calculated from this ________ of the sheave and the pitch line of the
belt.
High-Capacity vs Classical V-belts
HC are preferred over Classical for new designs because the narrow wedge design provides more
support for the tensile members. HC are available in clogged raw edge designs, Eg: 3VX, 5VX.
Power Band/ Banded Belts
Also called joined classical belts. Constructed by joining two or more standard belts with a common
backing. Developed to solve problems of belt vibration, whip, and turnover
Flat Belt Pulley Width
The width of a new flat belt is determined by the width of the narrowest pulley. Generally the pulley
face should be:
-1" wider than the belt (for pulleys up to 6" wide)
-2" wider than the belt (for pulleys over 6" wide)
Flanged pulleys
