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Subpart O Machine Guarding. Subpart O. 1910.211 Definitions 1910.212 General Requirements for all Machines 1910.213 Woodworking Machinery 1910.215 Abrasive Wheel Machinery 1910.216 Mills and Calendars 1910.217 Mechanical Power Presses 1910.218 Forging Machinery

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subpart o
Subpart O
  • 1910.211 Definitions
  • 1910.212 General Requirements for all Machines
  • 1910.213 Woodworking Machinery
  • 1910.215 Abrasive Wheel Machinery
  • 1910.216 Mills and Calendars
  • 1910.217 Mechanical Power Presses
  • 1910.218 Forging Machinery
  • 1910.219 Mechanical Power-Transmission
basics of machine safeguarding
Basics of machine safeguarding

A good rule to remember is:

  • Any machine part; function; or process which may cause injury must be safeguarded.
basic areas of safeguarding
Basic areas of safeguarding
  • The point of operation
  • Power transmission apparatus
  • Other moving parts (reciprocating, transverse, or rotating)
motions
Motions
  • Rotating (including in-running nip points)
  • Reciprocating
  • Transverse
nip points
Nip points

Nip point

Nip point

Nip point

Nip point

Nip point

nip points1
Nip points

A

Typical nip points

Nip point

Nip point

B

C

Nip point

rotating hazards
Rotating hazards

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

pinch points caused by tables
Pinch points caused by tables

Table

Bed (stationary)

transverse motion of a belt
Transverse motion of a belt

Transverse motion of belt

safeguarding
Safeguarding

Guards

  • Prevent access to the danger areas

Devices

  • Control access to the point of operation
actions
Actions
  • Cutting
  • Punching
  • Shearing
  • Bending
different actions
Different actions

Stock

Cutting tool

guards
Guards
  • Fixed
  • Interlocked
  • Adjustable
  • Self-adjusting
fixed guard on a bandsaw
Fixed guard on a bandsaw

Wheel guard

Blade guard

Wheel guard

fixed guard on a power press
Fixed guard on a power press

Stock entering danger zone

Stock exit

Transparent insert in front panel

fixed guard on a power squaring shear
Fixed guard on a power squaring shear

Blade guard

Throat and gap guard

ends and unused portion of press brake guarded
Ends and unused portion of press brake guarded

End of the guarded

Transparent guard

Mounting bolt

Power press brake (When used in a power press)

The requirements of 4123:1-5-10

Shall be applicable to power press brakes when used for other than bending operations

pedestal grinder
Pedestal grinder

Point of operation

Rotating wheels

Stock

Adjustable stock rest

Operating control (on/off switch)

Note: Grinding wheels are usually enclosed as shown.

Base

adjustable guard on table saw
Adjustable guard on table saw

Crank for height adjustment

Handle for extending or retracting guard over blade

Saw blade

Guard

adjustable guard on wood shaper
Adjustable guard on wood shaper

Nut for height adjustment

Guard

Base of shaper blade

adjustable guard on router
Adjustable guard on router

Adjustment nuts

Guard

Stock

Base of router blade

self adjusting guard on radial arm saw
Self-adjusting guard on radial arm saw

Handle

Guard

Anti-kickback device

Blade

self adjusting guard on circular saw
Self-adjusting guard on circular saw

Guard retracted

Stock

Blade

Guard

self adjusting guard table saw
Self-adjusting guard table saw

First guard

Second guard

self adjusting guard on jointer
Self-adjusting guard on jointer

Guard in rest position

Guard

Stock

shields on a drill press and lathe
Shields on a drill press and lathe

Transparent shield

Lathe

Drill

devices
Devices
  • Presence sensing
    • Photo-electrical
    • Radio-frequency
    • Electromechanical
  • Pullback
  • Restraint
photoelectric presence sensing devices
Photoelectric presence sensing devices

Sensing device

Danger area

Sensing device

electromechanical sensing device on an eye letter
Electromechanical sensing device on an eye-letter

Probe in contact with fingers, machine will not cycle

Rocker-arm welder

Air-operated welder

Similar safety devices are utilized on: spot welders and riveters

pullback device on a power press
Pullback device on A power press

Pullback mechanism

Danger area

Wristband

pullback device on a press brake
Pullback device on A press brake

Nylon pullback straps are attached to wristbands

devices1
Devices
  • Safety controls
    • Safety trip control
      • Pressure-sensitive body bar
      • Safety triprod
      • Safety tripwire cable
  • Two-hand control
  • Two-hand trip
devices2
Devices
  • Gates
    • Interlocked
    • Other
  • Location/distance
robot with fixed barrier guards
Robot with fixed barrier guards

Press

Robot

Stock conveyor

Fixed barrier

potential feeding and ejection methods to improve safety for the operator
Potential feeding and ejection methods to improve safety for the operator
  • Automatic feed
  • Semi-automatic feed
  • Automatic ejection
  • Semi-automatic ejection
power press with automatic feed
Power press with automatic feed

Transparent enclosure guard

Stock feed roll

Danger area

Completed work

Scrap material

power press with chute feed
Power press with chute feed

Chute inclined as necessary for gravity feeding

power press with sliding die
Power press with sliding die

Handle

Die stop

Die slide

power press with sliding bolster
Power press with sliding bolster

Bolster in retracted position

Die in stock placement or removal position(bolster in extended position)

saw with auto indexing mechanism and traveling head
Saw with auto indexing mechanism and traveling head

Blade enclosure guards

Indexing mechanism

Stock

holding tools
Holding tools

Pliers with curved handles

for two-handed usage

Duckbill pliers

Right angle jaw tongs for handling flanged or cup shaped work pieces

Feeding tongs

A lightweight tweeter

made of steel springs

Vacuum-tongs for feeding positioning heavy formed parts

Magnetic lifter “twist-off”

Double magnet withrelease lever

Tong device used to tube or cup

Double cup lifterwith release button

pushing devices
Pushing devices

Stock

Push stick

Push block

five concerns on any machine
Five concerns on any machine
  • Safeguarding - guard, device, method
  • Controls - control reliability
  • Disconnect - lockable in off position
  • Starter - magnetic (for drop-out protection)
  • Covers - rotating components covered to 7ft. from floor or from working platform.