Transcript Tools & Measuring Instruments

TOOLS & MEASURING
INSTRUMENTS
Ag Mechanics
SHOP TOOLS

Quality tools recommended by the manufacturer
should be used when servicing a small gas
engine,


Makes service easy and effective and prevents
damage to parts
Common shop tools include
Wrenches
 Piers
 Screwdrivers

- Punches
- Hammers
- Chisels
- Measuring Instruments
WRENCHES

There are many types of wrenches, and it is
important to use the correct tool when faced with
a decision of which would be best.
Box end, open end, adjustable, and socket type
wrenches should be used on hexagon bolts and nuts
 Which is better to use if you can encompass the
entire bolt head, an open or closed end wrench?

IDENTIFY THESE WRENCHES
A.
B.
C.
D.
IDENTIFY THESE WRENCHES
A.
Combination
Wrench
B.
Open End
Wrench
C.
Adjustable
Wrench
D.
6 Point Socket
& Ratchet
Handle
WRENCHES

An adjustable wrench should be used as a last
resort when other wrenches are not available.


Adjustable wrenches are prone to loosening and
slipping around the corner of bolts and nuts
A torque wrench is used to tighten threaded
fasteners to a specific torque setting.

Torque is the turning force applied to the fastener
PLIERS


Pliers are useful for gripping, bending, pulling,
and cutting wires.
THEY SHOULD NOT BE USED IN PLACE OF
WRENCHES
IDENTIFY THESE PLIERS
A.
B.
C.
D.
ANSWER
A.
Water Pump
Pliers
B.
Slip Joint
Pliers
C.
Lineman
Pliers
D.
Needle Nose
Pliers
SCREWDRIVERS

Screwdrivers are available in a variety of shapes
and sizes.

Standard and phillips variety


The proper size blade should be used to match the length
and thickness of the screw head slot
Offset screwdrivers can be used in tight
situations.
IDENTIFY THESE SCREWDRIVERS
A.
B.
C.
D.
IDENTIFY THESE SCREWDRIVERS
A.
B.
Standard
Screwdriver
Stubby
Screwdriver
C.
Offset
Screwdriver
D.
Phillips
Screwdriver
PUNCHES

Many types of punches are used for small engine work
Center punch
 Has a point on the end, used to make depression in metal
surfaces before drilling
 Prick punch
 Same as above, but the point is 60 degrees to leave a small
depression prior to using the center punch
 Pin punch
 Used to drive pins
 Drift punch
 Used to align holes in mating parts

IDENTIFY THESE PUNCHES
A.
B.
C.
D.
IDENTIFY THESE PUNCHES
A.
Center Punch
B.
Drift Punch
C.
D.
Pin Punch
Prick Punch
MEASURING INSTRUMENTS
High quality measuring instruments should always be
used when servicing a small gas engine.
 Measurements are made to determine if parts are
within specific limits or if adjustments are needed.


Calipers
 Used to measure the diameter or thickness of an object


Inside or outside
Micrometers
 Precision instrument designed to accuratley measure engine
parts
IDENTIFY THESE MEASURING TOOLS
A.
B.
C.
D.
IDENTIFY THESE MEASURING TOOLS
A.
Micrometer
B.
Outside Caliper
C.
Inside Caliper
D.
Feeler Gauge
PARTS OF A MICROMETER

To understand how to take a reading from a
micrometer, we need to know the parts.





Anvil
Spindle
Sleeve
Frame
Thimble
THIS IS A ENGLISH MICROMETER
anvil spindle
frame
sleeve thimble
STEPS TO READING A MICROMETER
Lightly tighten on object.
 Determine smallest measurement when
micrometer is closed.
 Find largest visible number on sleeve and
multiply times 0.100.
 Count number of marks past largest visible
number on sleeve and multiply times 0.025.
 Multiply thimble reading times 0.001.
 Add all numbers to get answer.

NOW, AN EXAMPLE...
Smallest Measurement Largest sleeve reading
19
18
0 1 2 3 4 5 17
6789
16
15
0.000
0.300
0.025
0.016
14
13
0123
0.341 inchesOne mark past
largest sleeve
reading
Thimble Reading
15
18
17
16
14
13
15
Another example...
Smallest Measurement Largest sleeve reading
20
15
3.000
0.400
0.075
0.021
3.496 inches
0 1 2 3 4
24
23
22
21
19
18
17
16
0
20
Thimble Reading
Three marks past largest
sleeve reading
REVIEW...
Lightly tighten on object.
 Determine smallest measurement when
micrometer is closed.
 Find largest visible number on sleeve and
multiply times 0.100.
 Count number of marks past largest visible
number on sleeve and multiply times 0.025.
 Multiply thimble reading times 0.001.
 Add all numbers to get answer.
