micrometer
rotors
drums
lathe work
drums continued
100
When you use the money method to read a micrometer, where do you move the decimal when you have your answer?
What is 1 place to the left
100
This specification represents the thinnest that a rotor can be and still be reused
What is minimum thickness or machine to spec
100
the specification for machining a drum is called
What is Max Diameter
100
You install a rotor n the lathe and start a scratch cut. The scratch only goes 1/3 the way around the rotor. How do you know if the rotor is warped or if your set-up on the lathe is to blame?
You need to rotate the adapters and recheck the position of the scratch. If it moves, the set-up is bad, if it stays in teh same place the rotor is warped
100
If the max. diam. of a drum is 10.098" and you measure it with a drum micrometer and it measures 11.030, what is your course of action?
What is replaced
200
when using the money method to read a micrometer what does the number on the barrel represent?
What is dollars
200
this specification represents the thinnest that a rotor can be reused to. (not resurfaced, just reused)
What is discard
200
This is the amount of metal typically left after machining a drum to allow for wear. (the difference between the minimum thickness and the discard spec.)
What is .015"-.030"
200
This is used to prevent chatter when resurfacing a drum or rotor
What is a silencer band or strap
200
The drum on the right side measures 11.001" and the drum on the right side measures 11.031. The max diam. is 11.040" What is the best course of action for brake balance?
What is replace the drums
300
when using the money method to read a micrometer, what does the hash marks between the numbers on the barrel represent?
What are quarters
300
This range of numbers represents the maximum lateral run-out allowable by most manufacturers
What is .0015"-.003"
300
Regardless of the material that a drum is made of, almost all drums use what material for the wear surface
What is cast iron
300
A rotor measures .968" .970" and .968" when measured in three places, it is not scored and the min. thk. spec. is .960" What course of action should be taken?
What is machine to the proper thickness variation
300
hard spots in a drum are caused by this
What is excessive heat and pressure
400
when using the money method to read a micrometer, what do the numbers and hash marks on the thimble represent? (rotating component)
What is pennies (cents)
400
This is what you must do if a rotor has deep scoring or hard spots but is still thicker than the min thk. spec.
What is resurfacing (machining)
400
a good drum that is not cracked will do this when tapped with a hammer
What is "ring like a bell"
400
A brake rotor has excessive LRO and the hub is to blame. Aside from replacing the hub, what is teh best way to eliminate the LRO?
What is use an on-car lathe
400
What does the absence of a chamfer in a drum indicate if it had one when new?
What is exceeded max inside diameter
500
when reading a drum micrometer, what does the dial indicator tell you? (increments of)
What is thousandths of an inch
500
If a rotor has vented vanes that are angled or slots that are angled, then the rotor is ______________ which means it must be marked for location after removal.
What is directional
500
If a drum has hard spots, what needs to be done?
What is replaced
500
slotted and cross drilled rotors can be resurfaced as long as you use what type of bot?
What is positive rake
500
if the drum wear surface is worn on an angle, what is that called?
What is bell mouth
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