OSHA 1910.217: Mechanical Power Press Requirements

OSHA 29 CFR 1910.217 sets specific requirements for mechanical power presses used in U.S. general industry workplaces. Mechanical power presses can create severe crushing, shearing and amputation hazards at the point of operation, where the die closes on the workpiece.

The main safeguarding objective is to prevent employees from being exposed to injury at the point of operation while the press is capable of hazardous movement. This may involve point-of-operation guards, two-hand controls or trip devices, presence-sensing safeguarding devices, automated feeding systems or another suitable safeguarding method for the press and operation.

A press guard is not a standalone item. The safeguarding arrangement must work with the press control system, clutch and brake performance, die setup, material-handling method, access requirements and maintenance procedures.

This article provides a general overview of U.S. OSHA requirements. OSHA 1910.217 contains detailed machine-specific provisions. Employers should review the current regulation, press manufacturer instructions, die information and any applicable OSHA-approved state-plan requirements.

What OSHA 1910.217 Covers

OSHA 1910.217 applies to mechanical power presses. Mechanical power presses use mechanically driven slide movement and are typically associated with flywheel, clutch and brake arrangements. They are distinct from hydraulic presses, which are subject to different safeguarding considerations.

The regulation addresses areas including:

• point-of-operation safeguarding
• press controls and operating modes
• clutch and brake systems
• two-hand controls and two-hand trip devices
• foot controls
• safeguarding devices
• die setting and setup
• inspection, maintenance and recordkeeping requirements
• construction, reconstruction and safety-device requirements

Other OSHA provisions may also apply depending on the machine and operation, including:

• 29 CFR 1910.212 for general machine guarding
• 29 CFR 1910.147 for hazardous-energy control during servicing and maintenance
• 29 CFR 1910.219 for mechanical power-transmission apparatus
• 29 CFR 1910.132 for personal protective equipment
• applicable electrical, material-handling and housekeeping requirements

A press may have a point-of-operation guard but still present risk from exposed flywheels, belts, pulleys, die-changing tasks, scrap removal or inadequate energy isolation.

Main Mechanical Power Press Hazards

Mechanical power presses can cause severe injury in a single cycle. The highest-risk area is normally the point of operation, including the space between the upper and lower dies.

Common hazards include:

• crushing and shearing between the dies
• amputation or severe hand injuries at the point of operation
• unexpected or repeated press cycling
• access during die setting, adjustment or troubleshooting
• ejection of material, scrap or broken tooling
• entanglement with flywheels, belts, pulleys, gears or shafts
• trapping at automated feeding or transfer equipment
• stored mechanical, pneumatic, hydraulic or electrical energy
• exposure during maintenance, cleaning and jam clearing

The risk assessment should consider the complete press system, including dies, feeding equipment, material handling, automation, controls, scrap removal and any surrounding guarding.

Point-of-Operation Safeguarding

The point of operation must be safeguarded when employees could be exposed to injury during normal press operation.

Suitable safeguarding methods may include:

• fixed, adjustable or enclosed point-of-operation guards
• properly designed interlocked guards where compatible with the press operation and control system
• two-hand controls or two-hand trip devices
• presence-sensing safeguarding devices for suitable applications
• pull-out or restraint devices
• automated or semi-automated feeding systems
• die enclosures or other engineered methods that prevent access during the hazardous portion of the cycle

The appropriate method depends on the press, die design, stock size, production method, operating mode and frequency of access.

A fixed guard may be suitable where the press process is enclosed or access is not required during operation. Where the operator must regularly load or remove parts, another safeguarding method may be needed. The selected system must protect the point of operation without creating unsafe workarounds.

Mechanical Power Press Controls

Mechanical power press safety depends heavily on the control system and clutch/brake arrangement.

The safeguarding review should consider:

• the press operating mode
• permitted operating modes, including single-stroke operation and any other mode allowed by the specific press design, safeguarding arrangement and applicable requirements
• clutch and brake performance
• anti-repeat and unintended-recycling protection
• control reliability
• reset and restart behavior
• control location and visibility
• prevention of unintended cycling
• safety-device integration
• stopping performance

Two-hand controls and other press controls must be selected, installed and maintained so they provide the intended protection for the specific press operation. They should not be treated as ordinary pushbuttons.

A press control arrangement that appears to stop the machine may still be unsuitable if a person can reach the point of operation before hazardous motion has ceased or if the press can repeat unexpectedly.

Two-Hand Controls and Presence-Sensing Devices

Two-hand controls and two-hand trip devices can help keep an operator’s hands away from the point of operation during press initiation. Their suitability depends on the press operation, control arrangement, cycle type, required safety distance and whether access remains possible from another direction.

Presence-sensing safeguarding devices, including safety light curtains or other electro-sensitive protective equipment, may be used on suitable press applications where the press stopping performance, safety distance and control-system design support their use.

Before selecting a light curtain or another presence-sensing device, assess:

• stopping time and brake performance
• control reliability and safety-function design
• access around, under or over the protective field
• access from the rear or sides of the press
• the ability to reach the danger zone after actuating the device
• material loading and unloading requirements
• the effect of die changes or altered tooling
• reset location and visibility

A light curtain is not a universal replacement for physical guarding. It may be unsuitable where the press stopping performance, access paths or control-system condition do not support its use.

Guarding Around the Press and Associated Equipment

Point-of-operation safeguarding is only one part of press safety.

The wider guarding review may include:

• flywheels, gears, belts, pulleys and shafts
• die-set and ram movement
• press sides and rear access
• automated feeders and coil-handling equipment
• transfer systems and conveyors
• scrap chutes and ejection areas
• robotic loading or unloading equipment
• pinch points between the press and surrounding machinery

For larger press lines or automated cells, modular machine guarding may be used to control whole-body access around presses, transfer equipment, robots and material-handling systems.

Modular perimeter guarding does not replace point-of-operation safeguarding. The press die area, accessible transmissions and other local hazards still need machine-specific protection.

Die Changes, Setup and Maintenance

Die setting, adjustment and maintenance are high-risk activities because guards may be opened or removed and employees may need to work near the point of operation.

The safety review should address:

• shutdown and isolation procedures
• control of electrical, pneumatic, hydraulic, mechanical, flywheel and gravity-related energy, as applicable
• die-setting, adjustment and maintenance procedures
• the use of safety blocks or other required measures where employees could be exposed to slide or ram movement
• controlled access during setup
• safe removal of scrap and material
• verification that guards and safety devices are restored before restart
• inspection of controls, clutch/brake systems and safeguarding after repair

An emergency stop is not a substitute for lockout/tagout or other energy-isolation procedures. Where servicing exposes employees to hazardous energy or unexpected movement, applicable energy-control requirements must be followed.

Common Mechanical Power Press Safeguarding Mistakes

Common failures include:

• relying on operator skill instead of point-of-operation safeguarding
• using two-hand controls while leaving access from the side or rear
• fitting a light curtain without assessing stopping performance
• failing to control repeat cycling
• operating with damaged or bypassed safety devices
• leaving flywheels, belts, pulleys or gears exposed
• allowing operators to remove scrap by hand near the die
• bypassing interlocks during setup or maintenance
• failing to isolate the press before die changes
• treating perimeter fencing as a substitute for point-of-operation protection

A mechanical power press should be reviewed as a complete system. The die area, controls, local guards, feeding arrangement and maintenance procedures all need to work together.

Relevant Standards and Technical Considerations

Although OSHA 1910.217 is the central U.S. regulation for mechanical power presses, other standards and guidance may also be relevant depending on the equipment and safeguarding method.

Common references may include:

• ANSI B11.1 for mechanical power presses
• ISO 12100 for machinery risk assessment and risk reduction
• ISO 13849-1 for safety-related parts of control systems
• ISO 13855 for positioning of safeguards where approach speed and stopping time are relevant
• ISO 14120 for the design and construction of guards
• ISO 14119 for interlocking devices associated with guards

These standards may provide useful technical guidance, but they do not replace the applicable requirements of OSHA 29 CFR 1910.217 in U.S. workplaces. Workplaces outside the United States should review applicable local machinery-safety laws, regulations and standards.

Conclusion

OSHA 1910.217 addresses serious hazards associated with mechanical power presses, especially crushing and shearing at the point of operation.

Effective safeguarding requires more than a physical barrier. It may involve point-of-operation guards, properly designed controls, two-hand devices, presence-sensing protection, safe feeding methods, guarded transmissions and reliable energy isolation for setup and maintenance.

For automated press lines, modular perimeter guarding can help control whole-body access around associated robots, feeders, conveyors and transfer systems. It does not replace the machine-specific safeguarding required at the die area.

If you are reviewing a mechanical power press, start with the die operation, existing point-of-operation protection, press controls, stopping performance, material handling and maintenance procedures. A competent press-safety professional or machinery safety specialist can help identify the safeguards required for the application.

Frequently Asked Questions

What does OSHA 1910.217 cover?

OSHA 29 CFR 1910.217 covers mechanical power presses used in U.S. general industry workplaces. It includes requirements relating to press controls, point-of-operation safeguarding, clutch and brake systems, safety devices and related press operations.

Does OSHA 1910.217 apply to hydraulic presses?

No. OSHA 1910.217 applies specifically to mechanical power presses. Hydraulic presses may be subject to other OSHA requirements and applicable industry standards.

What is the point of operation on a mechanical power press?

The point of operation is the area where the die performs work on the material, typically between the upper and lower die sections.

Are two-hand controls enough to safeguard a press?

Not always. Two-hand controls must be suitable for the press operation and should prevent the operator from reaching the point of operation during the hazardous cycle. Other access paths and the press stopping performance must also be considered.

Can light curtains be used on mechanical power presses?

Yes, in suitable applications. Their use depends on press stopping performance, safety distance, control reliability, access from other directions and the specific press operation.

Does perimeter fencing replace point-of-operation guarding?

No. Perimeter fencing can control whole-body access to automated press lines or cells, but it does not replace point-of-operation safeguarding at the die area.

What should be checked before servicing a mechanical power press?

Check energy-isolation requirements, stored energy, die-block or safety-block requirements where applicable, guard condition, safety-device operation, press controls and the safe condition of the press before servicing begins.