WAC 296-806-455 Mechanical Power Presses

For printing

This section applies to mechanically powered machines that transmit force to cut, form, or assemble metal or other materials through tools or dies attached to or operated by slides.

Your Responsibility

To make sure mechanical power presses meet the requirements of this section

You must

DESIGN AND CONSTRUCTION

WAC 296-806-45502

Make sure mechanical power presses are properly designed and constructed

You must

• Make sure mechanical power presses manufactured before January 1, 2005, meet the requirements of American National Standards Institute (ANSI) B11.1-1971, Safety Requirements for the Construction, Care, and Use of Mechanical Power Presses.
• Make sure mechanical power presses manufactured, reconstructed, or modified on or after January 1, 2005, meet the requirements of ANSI B11.1-2001, Safety Requirements for Mechanical Power Presses.

SAFEGUARDING

WAC 296-806-45504

Safeguard presses that use unitized tooling

You must

• Safeguard the opening between the top of the punch holder and the face of the slide or striking pad by using properly installed, adjusted, and maintained guards or devices.

WAC 296-806-45506

Protect operators from guidepost hazards

You must

• Use properly installed, adjusted, and maintained guards or devices to protect operators from the hazards created by:
  • – Guideposts separating from their bushings
  • – Similar pinch points between the slide (moving die) and fixed die or press attachments

  Exemption: This requirement doesn't apply if the opening is ¼ inch or less, before use.

   

WAC 296-806-45508

Safeguard the point of operation

You must

• Protect employees from point-of-operation hazards by using properly installed, adjusted, and maintained guards or devices.

WAC 296-806-45510

Make sure point-of-operation guards are properly designed and constructed

You must

• Make sure each guard:
  • – Prevents the operator’s hands or other body parts from reaching through, over, under, or around the guard into the point of operation.
  • – Has no opening larger than the maximum permissible openings shown in
    Table 200-1, Largest Allowable Guard Openings, WAC 296-806-20042.
  • – Doesn't create a pinch point between the guard and moving machine parts.
  • – Uses fasteners that can't be easily removed by the operator.
  • – Is easy to inspect.
  • – Provides the best view of the point of operation for the type of work.

WAC 296-806-45512

Make sure barrier guards meet these requirements

You must

• Make sure a fixed barrier guard is attached to a fixed surface such as the stripper, die shoe, press frame, or bolster plate.
• Make sure the interlocked barrier guard:
  • – Is attached to a fixed surface such as the press frame or bolster plate
  • – Prevents cycling (stroking) of the press when the interlocked section of the guard isn't in the protecting position
  • – Can't open until hazardous motion of the slide has stopped
• Not use the hinged or movable sections of an interlocked barrier guard for manual feeding.
• Make sure an adjustable barrier guard is:
  • – Attached to a fixed surface such as the press frame, bolster plate, or die shoe
  • – Adjusted only by authorized persons who can apply Table 200-1, Largest Allowable Guard Openings, WAC 296-806-20042.

  Reference: See, Provide additional safeguards when the operator puts one or both hands into the point of operation, WAC 296-806-45526, for additional safeguards that are required if the operator puts one or both hands into the point of operation to feed or remove parts, and the point of operation is protected by a Type B gate or movable barrier device.

  
  

WAC 296-806-45514

Make sure point-of-operation devices are effective

You must

• Make sure point-of-operation devices protect the operator from hazards as shown in Table 455-1, Point-of-Operation Devices.
• Make sure the motor start button is protected against accidental contact.

Table 455-1
Point-of-Operation Devices

WAC 296-806-45516

Make sure presence-sensing devices used to safeguard the point of operation meet these requirements

You must

• Make sure the presence-sensing device is interlocked into the control circuit to prevent or stop slide motion if the operator’s hand or other body part is within the sensing field of the device during the down stroke of the press slide.
• Make sure muting of the device is done only during the upstroke of the press slide.
• Make sure failure of any component of the device:
  • – Doesn't prevent normal stopping action of the press
  • – Prevents initiation of another cycle (stroke) until corrected
  • – Is indicated by the system
• Use guards to protect all areas of entry to the point of operation not protected by the presence-sensing device.
• Make sure the sensing field of the device is located farther from the point of operation than the minimum safety distance as determined by the following formula:

  D = 63 X T
  Where:
  D = minimum safety distance (in inches)
  T = stopping time of the press measured at approximately the 90 degree position of crankshaft rotation (in seconds)

Example:
The number in the formula represents the hand speed of the operator (63 inches per second). If your press has a stopping time of 1/2 seconds (.5 seconds), the calculations would be:

D = 63 X .5 = 31.5
The sensing field would need to be at least
31-½ inches from the point of operation.

WAC 296-806-45518

Make sure pull-back devices used to safeguard the point of operation meet these requirements

You must

• Make sure presses requiring more that one operator have a separate pull-back device for each operator.
• Make sure each pull-back device has attachments:
  • – For each of the operator’s hands
  • – That are connected to and operated only by the press slide or its attached die
  • – That are adjusted to either:
    • Prevent the operator from reaching into the point of operation
      or
    • Withdraw the operator’s hands from the point of operation before the dies close
• Check each pull-back device that's being used for proper adjustment at these times:
  • – At the start of each operator shift
  • – After a new die set-up
  • – When operators are changed
• Complete necessary maintenance or repair work before operating the press.

WAC 296-806-45520

Make sure restraint (holdout) devices used to safeguard the point of operation meet these requirements

You must

• Make sure presses requiring more than one operator have separate restraint devices for each operator.
• Make sure each restraint device has attachments:
  • – For each of the operator’s hands
  • – That are securely anchored
  • – That are adjusted so the operator can't reach into the point of operation

WAC 296-806-45522

Make sure two-hand control devices used to safeguard the point of operation meet these requirements

You must

• Make sure presses that require more than one operator:
  • – Have separate two-hand controls for each operator
  • – Need concurrent application of all operators’ controls to activate the slide
• Make sure the slide stops if any operator’s hand's removed from a control button.
• Make sure two-hand controls are fixed in position and can be moved only by authorized persons.
• Make sure the controls are located farther from the point of operation than the minimum safety distance as determined by the following formula:

  D = 63 X T
  Where:
  D = minimum safety distance (in inches)
  T = stopping time of the press measured at approximately the 90 degree position of crankshaft rotation (in seconds)

Example:
The number in the formula represents the hand speed of the operator (63 inches per second). If your press has a stopping time of 1/2 second (.5 second), the calculations would be:

D = 63 X .5 = 31.5
The controls would need to be at least 31½ inches from the point of operation.

WAC 296-806-45524

Make sure two-hand trip devices used to safeguard the point of operation meet these requirements

You must

• Make sure presses requiring more than one operator:
  • – Have separate two-hand trips for each operator
  • – Need concurrent application of all operators’ controls to activate the slide
• Make sure the two-hand trips are fixed in position and can be moved only by authorized persons.
• Make sure the controls are located farther from the point of operation than the minimum safety distance as determined by the following formula:

  D = 63 X T
  Where:
  D = minimum safety distance (in inches)
  T = the maximum time the press takes for the die to close after the press has been tripped (in seconds)

Example:
The number in the formula represents the hand speed of the operator (63 inches per second). If your press has a die closing time of 1/2 second (.5 second), the calculations would be:

D = 63 X .5 = 31.5
The trip device would need to be at least
31½ inches from the point of operation.

WAC 296-806-45526

Provide additional safeguards when the operator puts one or both hands into the point of operation

IMPORTANT:

• This rule applies when the operator puts one or both hands into the point of operation to feed or remove parts, and the point of operation is protected by any of the following:
  • – Presence-sensing device
  • – Two-hand control
  • – Type B gate or movable barrier device

You must

• Make sure the press has both a:
  • – Stopping-performance monitor (previously called brake-system monitor)
    and
  • – Control system that monitors the performance of safety-related functions (previously called control reliability)
• Make sure the stopping-performance monitor meets the requirements of:
  • – American National Standards Institute (ANSI) B11.1-1982, Mechanical Power Presses - Safety Requirements for Construction, Care, and Use for presses manufactured before January 1, 2005
  • – ANSI B11.1-2001, Safety Requirements for Mechanical Power Presses for presses manufactured on or after January 1, 2005
• Make sure the control system monitors the performance of safety-related functions so that failure of any component in the control system:
  • – Doesn't prevent normal stopping action of the press
  • – Prevents initiation of another cycle (stroke) until the failure is corrected
  • – Can be detected by a simple test or is indicated by the control system

  Exemption: This requirement doesn't apply to control system components that don't affect protection from point-of-operation hazards.

  Definition: The control system includes the sensors, manual input and mode selection elements, interlocking and decision-making circuitry, and output elements of the press-operating devices and mechanisms.