MTS Model 685.53 Grip Control Module - Manual (Page 18)

Model 685.53 Grip Control Module 18
Determining the Grip Operating Pressure
Operation
Determining the Grip Operating Pressure
You must consider the following factors to determine the appropriate grip
operating pressure:
• The type of grips to be used
• The specimens to be tested
• The tests to be performed
• The model number of the grip supply
Grip product information manuals (from MTS) describe how to determine the
required operating pressure. They include formulas and/or graphs to determine
the grip pressure (also called minimum operating pressure). The minimum
pressure, as referred to in the grip manual, is the calculated least pressure that
will provide adequate gripping of the specimen while it is being tested at specific
maximum loads.
If practice indicates that the calculated pressure proves to be too low (because the
specimen slips under load due to hardness or other characteristics), then the
actual minimum pressure will have to be increased to provide adequate gripping.
Use the grip product information manual to determine the minimum grip
operating pressure that is best for the test situation at hand.
The grip control can be configured to produce different output pressures. Check
the model number specification. See
“Adjusting the Output Pressure” on page 19
for the procedure.