MTS Advantage Pneumatic Grips - Manual (Page 53)

Adjusting the Air Supply Pressure
Advantage™ Pneumatic Grips Operation 53
Adjusting the Air Supply Pressure
The output pressure of the air supply determines the gripping force applied to the
specimen by the grip faces. The optimum gripping force is great enough to
securely grip the specimen, yet low enough to minimize specimen deformation or
prevent specimen slippage.
The grips can be damaged if operated with incorrect air pressure.
Insufficient air pressure can cause the wedges to separate from the piston.
Ensure you calculate the minimum required air pressure and set the air supply
above the calculated value and below 5.5 bar (80 psi).
Excessive air pressure can damage the piston seals.
Clamping force
Use the following formulas to determine the approximate clamping force of a
given air pressure:
Minimum pressure
The 10,000 N grips require a minimum operating air pressure
for any given gripping force. Use the formula to calculate the
minimum air pressure for the 10,000 N grip.
CAUTION
Model Formula
Clamping Force
*
* At 5.5 bar (80 psi).
10 N N ≈ bar x 5.6
lbf ≈ psi x 0.875
31 N
7 lbf
200 N N ≈ bar x 113.2
lbf ≈ psi x 1.75
623 N
140 lbf
2000 N N ≈ bar x 1290.9
lbf ≈ psi x 20
7100 N
1600 lbf
10,000 N †
† Calculate a minimum operating pressure.
kN ≈ bar x 3.23
lbf ≈ psi x 50
18 kN
4000 lbf
P
1.04 L ×
A
-------------------- =