Chapter: Risk reduction and safe use
26 M10-17313-EN
Rapid crosshead motion
Crush hazard to fingers or hands.
This hazard relates to grips and fixtures coming together as a result of rapid crosshead
motion, crushing hands or fingers.
For example, an operator inadvertently commands the system to jog or return while their
hands are in test area. This may also happen if the operator, in an attempt to be more
efficient, reaches in to remove broken specimen pieces while simultaneously returning
the crosshead to zero displacement.
Recommendations
In all situations:
• Set up test methods so that operators do not need to have their hands in the space
between fixtures while the crosshead is moving.
• Use the Operator Protection feature in Bluehill
®
software. This uses a reduced jog
speed (default 600 mm/min) during set up and you can set a lower jog speed if your
risk assessment requires it.
• Set appropriate travel limits every time you change the grips and adjust the
crosshead.
In addition, if the gap between grips and fixtures is less than 50 mm:
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