automotive service - grafton school district
TRANSCRIPT
Automotive Service Modern Auto Tech Study Guide
Chapter 6
Pages 70 - 84
Automotive Measurement & Math
20 Points
Automotive Service
1. _______________________ or “specs” are the minimum and maximum ( + )
wear limits (tolerances) and dimensions of important parts as published by
the manufacturers.
Specifications
Tolerances
Dimensions
Automotive Service
2. The two measuring systems commonly used in the auto shop are the:
A. ____________________ (STD) B. ____________________ (SI)
Customary & Metric
American & Asian
Global & Wentworth
Automotive Service
3. Math operations in the metric system often requires little more than
moving the _________ point.
Main
Decimal
Starting
3.004”
+ 3.250”
4.004”
- 4.000”
3.50mm
+ 3.15mm
4.95mm
- 4.80mm
Automotive Service 4. ________________________ charts are used when changing from one
measuring system to another.
Note: The ALLDATA information system that we use has an auto convert
feature for measuring units & systems.
Conversation
Calculation
Conversion
Automotive Service
Automotive Service 5. Fraction-to-decimal conversion charts are handy since _____________ are
more accurate than fractions and decimals are used more often when
servicing vehicles than fractions are.
Automotive Service
6. Customary rulers measure to the nearest fraction of an ____ & metric
rules measure in 1 mm increments.
Note: As a “benchmark”, 1 millimeter is about the thickness of a
dime or about .040” and 25mm is about 1”
Thickness of a Hair ≈ .002”
Thickness of a Dime ≈ .040”
Inch
Foot
Pound
Automotive Service 7. Both dial & electronic calipers can make _____________,
_____________, & ___________ measurements.
Inside
Outside
Depth
Automotive Service 8. A ______________________ can make measurements as accurate as
.0001” (one ten thousandth of an inch).
Micrometer
Plastic Ruler
Meter Stick
Automotive Service 9. ______________________ gauges and small ________ gauges are used
to take hard to reach internal measurements of bores which are then
transferred to a caliper or a micrometer to get exact dimensions.
Telescoping Gauges
Small
Hole
Gauges
Automotive Service 10. ____________ gauges of either the flat or wire type are used to find the
clearance between two surfaces.
Feeler Gauges
Dealer Gauges
Wheeler Gauges
Automotive Service
11. Dial ___________________ are delicate tools used to measure part movement
(play) in .001” or .01mm.
Calipers
Indicators
Testers
Automotive Service 12. ____________ of rotation often need to be measured or expressed when
learning about or when servicing vehicle systems, engines, and transmissions.
There are _____ degrees in a full circle. There are _____ degrees in a half circle.
Digress
Degrees
Digital
Automotive Service 13. Temperatures in both _______________ Fº and ____________ Cº degrees
often need to be measured. (cooling systems, AC systems, exhaust, brakes, etc.)
Fahrenheit
&
Celsius
Automotive Service 14. A ___________ wrench is used to apply a specific amount of twisting force
to fasteners like nuts or bolts.
Torque
Twist
Turn
Note: Every Tire & Wheel leaving our shop
is always final tightened to the correct torque!
Do it right, or don’t do it at all!
Automotive Service 15. Three types of torque wrenches are: ________ bar, ________ indicator, and
_________________ types. The ratcheting type is often referred to as the
“click” type or the “micrometer adjusting” type. (Electronic are also available)
Flex, Dial, Ratcheting
Twist, Meter, Scale
Turn, Bend, Stretch
Ratcheting Torque Wrenches
Can be Mechanical or Electronic
Automotive Service
Ratcheting Torque Wrenches
Can be Mechanical or Electronic
Automotive Service 16. Both _______ and ________ gauges are used to measure engine conditions.
Pressure & Vacuum
Pressure & Distance
Suction & Vacuum
Automotive Service 17. Pressure is expressed in either ____________ per ___________ inch (psi) or
kilopascals (kPa).
Pounds per Square Inch
Pounds per Newton Meter
Pounds per Half Inch
Automotive Service 18. Vacuum is expressed in either ______________ of ________________ (Hg”)
or kilograms per cm2.
Inches of Mercury (Hg”)
Inches of Length
Inches of Lift
Automotive Service
1 Bar ≈ 15 psi
Automotive Service
19-20. 240 inch pounds = ______ foot pounds of torque.
30 foot pounds = ______ inch pounds of torque.
inch pounds ÷ 12 = foot pounds
foot pounds x 12 = inch pounds