Shop Safety

1
Shop Safety

• Locate first aid kit and eye wash station

2
To report a campus emergency

• Tell the attending instructor
• If not available or practical call 4440 and
  explain the situation to campus security

3
To report a medical emergency or fire

• Tell the attending instructor
• If very serious do not hesitate to call 9911
• 9- 911and stay on the line

4
First step to dealing with a fire

• Insure those in the shop are immediately aware of
  the fire
• Additional Fire Safety
• Do not hesitate to evacuate the building
• If out of control make sure 9-911 is called
• (from a safe location)

5
Before using any new tool or piece of equipment

• Read the instructions and service procedures
• Ask questions
• DO NOT use any piece of equipment at Linn-Benton
  Community College until you have been checked out
  by an instructor

6
Before testing or diagnosing any unfamiliar
machine or system

• Locate and read manufacturer procedures
• Pay special attention to any precautions
• Ask Questions before proceeding

7
first aid kit location

• Find this and tell me where for Lab 1

8
First aid for liquid in the eyes

• Flush with lots of clean water while holding eye
  open
• Do not rub eye
• Get medical attention after flushing for ten
  minutes

Have A Partner Drive
9
List types of accidents or injuries to be
reported to a supervisor

• Report all accidents and injuries even if
  minor
• Report any situation, tool or piece of equipment
  that you feel is unsafe or potentially hazardous

10
fire extinguisher location

• Find them and tell me where for Lab 1

11
Medications

• Medications that reduce alertness are a hazard
• Read the label
• Report to instructor

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How can you tell if a substance is hazardous to
your health

• Read labels
• Ask for MSDS documents
• Read textbooks
• Ask questions

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Basic Electrical Theory
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Resistance ?

• Resistance is affected by
• 1) atomic structure of the material
• 2) length of the conductor
• 3) cross sectional area (size) of the conductor
• 4) temperature of the conductor
• 5) condition of the conductor

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Atomic Structure

• All materials have resistance to electron flow
• Materials with just a few electrons in their
  outer most orbit (valence ring) have low
  resistance

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Materials with Low Resistance

• Copper, aluminum, lead, gold, silver, and many
  other metals make good electrical conductors.
• These materials have just one or two electrons in
  the valence orbit of the atom
• It is easy to make these free electrons travel
  between atoms

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Materials with High Resistance
Wood
Rubber
Plastics
Glass
These materials have many electrons in their
outer valence electron orbit.
It takes tremendous pressure (Voltage) to move
electrons between these atoms
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Resistance in a conductor

• The longer the wire..
• .. the more resistance it will have
• The skinnier the wire..
• .. the more resistance it will have

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Resistance in a conductor

• The hotter the wire (or connection)..
• .. the more resistance it will have
• The more corroded the wire (or connector)..
• .. the more resistance it will have

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For Electricity to Work

• There must be a difference in electrical
  potential or pressure called...VOLTAGE
• A conductor for the amps to move through
• and Resistance to control the flow of electrons

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Ohms Law EIxR

• Voltage (Electromotive-force) is used up
• to push Amperage (the Intensity of the current)
• through a Resistance
• Increasing resistance will lower amp flow
• How will Increasing voltage affect the amp flow?
• Increase

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Ohms Law EIxR

• 1 volt can push 1 amp through 1 ? of resistance
• 12 volts can push 12 amps through 1 ? of
  resistance
• 12 volts can push 1 amp through 12 ? of
  resistance

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E I x R

• Define Resistance
• Resistance is the opposition to amp flow
• may be caused by heat, excessive amp flow,
  corrosion or any insulated material
• Resistance is required to perform work

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Voltmeter Testing

• Available Voltage
• Voltage Drop
• checks for resistance
• must be performed on an operating circuit

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Component Does Not Work

• Verify the problem
• Look for the obvious
• Check for available voltage
• Check for quality ground

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12.6 V
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12.6 V
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12.6 V
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12.6 V
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12.6 V
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12.6 V
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12.6 V
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12.6 V
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12.6 V
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0.0 V
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0.0 V
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0.0 V
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0.0 V
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12.6 V
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Diagnosis

• Understand the system
• Use a Wiring Diagrams

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0.0 V
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0.0 V
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12.6 V
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12.6 V
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0.0 V
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Intermittent or Unsatisfactory Circuit Operation

• Verify the problem
• Look for the obviousCheck for voltage drop
  across the load
• Check for voltage drop across the insulated or
  positive feed circuit
• Check for voltage drop across the ground

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12.6 V
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9.3 V
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12.6 V
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3.3 V
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0.1 V
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