Machinery

Safety
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Machine Safety Training

 ‫ئ‬
‫س لہ‬
‫نق‬ ‫ن‬ ‫م‬ ‫ن‬ ‫ن‬ ‫ش‬
‫سال م ی ری تچ ال ًے اور دی کھ ب ھال کرے والے ورکرز کو صان‬‫ت‬ ‫ن‬ ‫ہٹر‬
‫ق‬
‫ے۔ ری ب ا‬
‫ا ھا ا پڑ ا ہ‬
‫ٹ‬ ‫خ کن‬
‫•‪ 18,000‬کٹ‪ ،‬ز م‪ ،‬چ ل‬
‫ے والی چ و ی ں‪ ،‬اور رگڑی ں‬

‫•‪ 800‬اموات‬

‫‪2‬‬
‫‪OSHA 7100‬‬
 The Problem: Machinery
Associated with Amputations(
‫)ک ٹ‬
1. Mechanical power presses
2. Power press brakes
3. Powered and non-powered conveyors
4. Printing presses
5. Roll-forming and roll-bending machines
6. Food slicers
7. Meat grinders
8. Meat-cutting band saws
9. Drill presses
10. Milling machines
11. Grinding machines
3
 Causes of Machine Incidents
‫اسباب‬
• Reaching in to “clear” equipment
• Not using Lockout/Tagout
• Unauthorized person doing
maintenance or using the machines
• Missing or loose machine guards
• Lack of training

4
 Prevention
‫روک تھام‬
• Any machine part, function, or process
which may cause injury must be
safeguarded.
• Where the operation of a machine can
injure the operator or other workers, the
hazard must be controlled or eliminated

5
Machine Guarding

OSHA’s 1910 Subpart O

‫‪3 Basic Areas of Machines To‬‬
‫‪Be Safeguarded‬‬
‫‪• Point of Operation‬‬
‫ٹ ش‬ ‫ت‬ ‫نق‬
‫ن‬ ‫ک‬ ‫ن‬
‫ے کا ا‪ ،‬ل دی ا۔‬ ‫ج‬
‫ے‪ ،‬ی س‬
‫وہ طہ ج ہاں مواد پر کام ک ی ا ج ا ا ہ‬

‫‪• Power Transmission Apparatus‬‬

‫ش‬ ‫ن‬ ‫ن‬ ‫ت‬ ‫ن ن‬
‫ے والی م ی ن کے حص‬
‫ے می ں‬ ‫‪ )Mechanical‬کے مام اج زاء ج و کام ا ج ٹام د ی‬
‫ف ئ‬ ‫‪System‬‬ ‫ت‬ ‫ت منی ئکا ی ت قظ ام(‬
‫وا ا ی نم ل کرے ہ ی ں۔ جس می ں ال ی وہ ی ل‪ ،‬پ ل ی اں‪ ،‬ب ی لٹ‪ ،‬کن ی ک ن گ راڈ‪ ،‬ک پ ل ن گ‪ ،‬کی مز‪ ،‬اسپ ن ڈلز‪،‬‬
‫چ ین ز اور گی ئ رز ش امل ہ ی ں‬

‫‪• Other Moving Parts‬‬

‫ن‬ ‫ٹ‬ ‫ت‬ ‫ن‬ ‫ش‬ ‫ت‬
‫ک‬
‫دوران حرکت کرے ہ ی ں۔ اس می ں ری سی پرو ی گ‪،‬‬ ‫کام کر فے کے‬ ‫ے و ی ن کے ٹ‬ ‫م‬ ‫ج‬ ‫وہ مام ح نص‬
‫ش‬ ‫غ‬ ‫ن‬ ‫ن‬ ‫گ ن ٹ‬
‫ے‪7‬اور را سورس موو گ پ ار س‪ ،‬ی ڈ می کا زم و ی رہ امل ہ ی ں۔‬ ‫ھو م‬
 Hazard Identification
• Motions • Actions
– Rotating (including in- – Cutting
running nip points) – Punching
– Transverse – Shearing
– Reciprocating – Bending

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 Rotating Motion
• Hazard – • Danger increases
Machinery grips when projections
and moves are present
clothing, hair and – Screws, bolts,
body parts into nicks, abrasions,
danger area etc.

9
Rotating Parts with Projections

BURR Rotating shaft and pulleys with

projecting key and set screw

Rotating pulley with spokes and

projecting burr on face of pulley Rotating coupling with
projecting bolt heads
OSHA 3067
10
 In-Running Nip Points
Nip Point

Nip Point

Nip Point

Nip Point
Nip Point Nip Point

11
OSHA 3067
In-Running Nip Points

Nip Points

Nip Point
Nip Point

Nip Point OSHA 3067 12

 Transverse Motion
• Movement in a straight, continuous line
around rotating component
• Hazard may strike or catch employee a
pinch or shear point

13
OSHA 3067
 Reciprocating Motion
• Back and forth / up and down
• Hazard - Caught between moving part
and stationary object

OSHA 3067 14
 Bending Actions
• Power applied to
slide to draw or
stamp metal or other
materials in a
bending motion
• Example: Press
Brake, Tube
Benders

OSHA 3067 15
Bending Actions
Press Brake

16
 Punching Actions
• Power applied to
slide ram for
purpose of blanking,
drawing or stamping
• Example: Power
press

17
 Shearing Actions
• Apply power to slide or knife to trim or
cut

OSHA 3067
18
 Shearing Actions
Sheet Metal Shear

OSHA 7100

19
 Cutting Actions
• Rotating,
reciprocating or
transverse
motion
• Examples: Band
saw, circular
saws, lathes,
drills OSHA 3067
20
 Classification of Safeguards
• Guards
• Devices
• Location/distance
• Automatic/semiautomatic feed or
ejection
• Miscellaneous

21
 Types of Guards
• Fixed
– Provide secure barrier
• Interlocked
– Cuts off power when guard opened or removed
• Adjustable
– Barrier manually moved to accommodate stock or
operation
• Self-adjusting
– Barrier automatically moves to accommodate
operation
22
 Fixed Guards
• Advantages • Disadvantages
– Maximum – Poor visibility
protection – Must remove for repairs
– Variety of requiring LOTO
applications OSHA 3067

– In-house
fabrication
– Low cost &
maintenance
23
 Interlocked Guards
• Switch that when opened stops power
• Advantage
– Maximum protection
– Portion of guard easily removed for access
• Disadvantage
– Can be overridden by employee
– High cost
– Maintenance required
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 Adjustable Guards
• Advantage
– Flexibility
– In-house fabrication
Bandsaw blade
• Disadvantage adjustable guard
– Not maximum
protection
– Rely on worker to
properly position
– May prohibit easy
access OSHA 3067
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 Self-adjusting Guards
• Advantage
– Employee not
involved in positioning
– Readily available
• Disadvantage
– Not maximum
protection
– May need frequent
fine tuning
OSHA 3067

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 Self-adjusting Guard
Table Circular Saw

OSHA 10 Hour GI Presentation

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 Devices
• Presence sensing • Safety Controls
– Photoelectrical – Safety trip control
– Radiofrequency – Two-hand control/trip
– Electromechanical • Gates

28
Presence-Sensing Device

www.osha.gov/SLTC/etools/machineguarding/presses/
psd.html 29
 Two-Hand Control
• Requires constant,
concurrent pressure to
activate the machine
• The operator’s hands are
required to be at a safe
location (on control
buttons) and at a safe
distance from the danger
area while the machine OSHA 10 hour
completes its closing cycle

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 Safety Tripwire Cables
• Device located around
the perimeter of or
near the danger area
• Operator must be able
to reach the cable to
stop the machine

OSHA 10 hour
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 Gate
• Movable barrier device which protects the operator at the
point of operation before the machine cycle can be started
• If the gate does not fully close, machine will not function

Gate Open Gate Closed 32

OSHA 10 hour
 Gate
Vertical Downstroke Baler

33
www.cdc.gov/niosh/hc14.html
 Safeguard by
location/distance
• Position dangerous parts
of machine in
inaccessible areas during
normal operation
– Moving parts more
than 7 feet above floor
– Controlled access
room
– Control station at safe
distance from machine
OSHA 10 hour
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Feeding and Ejection Methods
• Automatic / semiautomatic feed
• Automatic / semiautomatic ejection
• Robots

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 Automatic Feed
(shown on power press)

Transparent
Enclosure
Guard

Stock Feed
Roll

Dang
er
Area

Completed Work

OSHA 3170 36
 Robots
• Machines that load and
unload stock, assemble Press
Robot
parts, transfer objects,
or perform other tasks
• Best used in high- Stock
Conveyor
production processes
requiring repeated
routines where they
prevent other hazards Fixed
to employees Barrier

OSHA 3170

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 Miscellaneous
• Awareness Barriers
• Protective Shields
• Hand tools

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 Awareness Devices
• Alert employees to hazard
– Signs
– Awareness signals
(audible or visual)

– Awareness barriers (allows access to

machine danger areas, but is designed to
contact employee, creating an awareness that
employee is close to danger point)

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 Protective Shields
These do not give complete protection from machine
hazards, but do provide some protection from flying
particles, splashing cutting oils, or coolants.

40
 Holding Tools
• Used to place and
remove stock in the
danger area
• Not to be used
instead of other
machine
safeguards, but as a
supplement
OSHA 3067

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 Requirements for Safeguards
• Prevent contact
• Secure, tamper-resistant, and durable
• Protect from falling objects
• Create no new hazards
• Create no interference
• Allow safe lubrication and maintenance

42
 Requirements of Safeguards
• Fixed guards should used whenever
possible
• Machines designed for fixed location
shall be secured to prevent movement
• Conform to ANSI and OSHA
requirements

43
 Machine Safety
Responsibilities
• Management
– ensure all machinery is properly guarded
• Supervisors
– train employees on specific guard rules in their
areas
– ensure machine guards remain in place and are
functional
– immediately correct machine guard deficiencies

44
 Machine Safety
Responsibilities
• Employees
– do not remove guards unless machine is
locked and tagged
– report machine guard problems to
supervisors immediately
– do not operate equipment unless guards are
in place

45
 Employee Training
• Hazards associated with particular machines
• How the safeguards provide protection and the
hazards for which they are intended
• How and why to use the safeguards
• How and when safeguards can be removed and by
whom
• What to do if a safeguard is damaged, missing, or
unable to provide adequate protection

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Some Examples of Machine
Guarding

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Abrasive Wheel Machinery
Improper Work Rest and Tongue

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 Abrasive Wheel Machinery
Work rests on offhand grinding machines must be kept
adjusted closely to the wheel with a maximum opening
of 1/8-inch to prevent the work from being jammed
between the wheel and the rest, which may result in
wheel breakage.

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OSHA 3067
 Abrasive Wheel Machinery
The distance between the wheel periphery and the
adjustable tongue must never exceed 1/4-inch.

OSHA 10 hour 50
 Abrasive Wheel Machinery
• When installing new abrasive wheel
– Inspect for condition and compatibility
– Conduct ring test

Click on picture
for video

OSHA 7100

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Abrasive Wheel Machinery

Checklist

52
 Power-Transmission Apparatus

Power-transmission Unguarded belt

apparatus (shafting, and pulley
flywheels, pulleys,
belts, chain drives, etc.)
less than 7 feet from
the floor or working
platform must be
guarded.

OSHA 10 hour
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Portable Circular Saws

Guard Retracted

Stock

Blade

Guard
54
OSHA 3067
 Table Saw

• On/off switch should

Guard be located at knee
height -- so you can
turn off machine while
your hands are on the
material
• Blade must be guarded
• Automatic brake a
good safety feature

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www.osha.gov/SLTC/etools/machineguarding/saws/
 Table Saw -- Kickback
• Back of the blade, as it rises out of
table, is the critical “kickback zone”
• Material tends to be lifted off of the table
• If wood moves sideways at this point, it
will be caught by the rotational motion
and will be flung back toward the
operator!

56
 Preventing Kickbacks
• Use a splitter or wedge inserted into the
saw kerf to separate material
• Make sure rip fence is perfectly parallel
to the blade

57
 Table Saw - Splitters
• Metal fins, secured behind and in line with the
blade -- must move freely & not stick open
• Anti-kickback pawls also attached

Splitter & anti-

kickback pawls

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www.orosha.org/pdf/pubs/2980.pdf
Table Saw - Push Sticks

Push stick

www.osha.gov/SLTC/etools/machineguarding/saws/tablesaws.html
59
 Radial Arm Saw

Anti-
Kickback
Device

Lower Blade Guard 60

 Machinery: General Safety
Principles
• Securely fasten equipment to eliminate
movement or “walking”
• No loose clothing, long hair, jewelry, or
gloves around rotating machine parts
• Respect machine guards
• Keep electrical cords and plugs intact
• Inspect machinery before each use
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 Machinery: General Safety
Principles
• Do not leave machines running and
unattended
• Never attend to brush debris from the
table surface while the machine is
running
• An active brake mechanism adds
greatly to safety
• Easily reached “off” switch increases
safety 62
Machine Guarding

Checklist

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Case Studies
Quiz
 Resources
• OSHA Machine Guarding Website
http://www.osha.gov/SLTC/machineguarding/index.html

• OSHA Machine Guarding eTool

http://www.osha.gov/SLTC/etools/machineguarding/index.html

• OSHA Amputation Fact Sheet

http://www.osha.gov/OshDoc/data_General_Facts/amputation-
factsheet.pdf

• Safeguarding Equipment and Protecting

Employees from Amputations
http://www.osha.gov/Publications/osha3170.pdf

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