User Manual
Table Of Contents
- Technical Support
- Preface
- Introduction
- Overview Reference
- Series 647 Hydraulic Wedge Grips Component Identification
- Series 647 Hydraulic Wedge Grips Functional Description
- About Gripping Specimens
- About Wedges
- About Spiral Washers
- About Couplings
- About All Temperature Grips
- About Environmental Chambers
- Hydraulic Fluid Recommendations
- Cooling Water Specifications
- Series 647 Wedge Grip Temperature Ranges
- Series 647 Hydraulic Wedge Grip Force and Torque Capacities
- Safety
- General Safety Practices: Grips and Fixtures
- Read all manuals
- Avoid Pinch and Crush Points
- Locate and read hazard placards/labels
- Know facility safe procedures
- Know controls
- Know Specimen Properties
- Have first aid available
- Be aware of component movement with hydraulics off
- Keep bystanders safely away
- Wear proper clothing
- Remove flammable fluids
- Check bolt ratings and torques
- Lift Equipment Safely
- Practice good housekeeping
- Do not exceed the Maximum Supply Pressure
- Do not disable safety devices
- Provide adequate lighting
- Provide means to access out-of-reach components
- Wear appropriate personal protection
- Handle chemicals safely
- Know system interlocks
- Know system limits
- Do not disturb sensors
- Ensure secure cables
- Stay alert
- Contain small leaks
- Stay clear of moving equipment/avoid crush points
- Know the causes of unexpected actuator motions
- General Precautions for Environmental Components
- Hazard Placard Placement
- General Safety Practices: Grips and Fixtures
- Installation
- Operation
- Maintenance
For monotonic testing:For fatigue testing:
3.
If desired, determine the actual clamping force (F
c
) applied to the specimen by using the following formula:
To derive the above equation, the static coefficient of friction (μ
c-w
) between the grip and wedge was
assumed to be 0.06 for lubricated steel on steel. If a different coefficient of friction is needed, use the
following formula, substituting your own value for μ.
Determine Gripping Pressure - Axial-Torsional for Round Specimens
Only
The following procedure determines the minimum gripping pressure for axial/ torsional testing of round
specimens.
Note:
The following figure shows the amount of torque the grips can provide is reduced at higher axial forces.
See “Force and Torque Capacities” for more information.
1. Determine the maximum torque to be applied to the specimen for the test.
2. Calculate the minimum grip supply pressure according to the formula:
3.
If desired, determine the actual clamping force (F
c
) applied to the specimen by using the following formula:
To derive the above equation, the static coefficient of friction (μ
c-w
) between the grip and wedge was
assumed to be 0.06 for lubricated steel on steel. If a different coefficient of friction is needed, use the
following formula, substituting your own value for μ.
82 Series 647 Hydraulic Wedge Grips Reference Manual
Operation