7.12 Flashcards
What are the three classifications (dimensions) of transmissions
Pitch
Width between inner plates
Roller diameter
What does a bi planar do to chains
Changes direction
What standard do transmissions follow
British standard 288
What can you use to prevent incorrect assembly
Wheels
Chain gaurds
Non reversible connector
What should you do if you see any defects on a chain or sprocket
Replace
If you only need to replace a certain portion within the assembly what bit do you have to proofload
Proof loading of the complete assembly and to 1/3 of its breaking load
During an elongation check what warrants a replacement
If the elongation is >2%
How do you check levers for their correct chains
By pushing locking wire through the whiteness holes
What do bevel gears do
Transfer power between intersecting shafts
What is the advantage of a helical over a spur gear
Quieter
Heavier loads
What advantages come with a worm gear
Minimum backlash
Larger step down between drive and driven (mechanical advantage)
When do you replace chains or sprockets
If they are damaged - don’t repair
What is backlash
The small clearance between two mating teeth
Why do we have backlash
Prevents gears jamming and making contact
Provides space for lubricant
Allows differential expansion between components
How do we measure the total backlash
By NDT
