Single-Acting Pneumatic Grippers
The STD-G (“Gripper”) series of products are a family of lightweight, high-moment capacity pneumatic grippers developed specifically for lift assists. The grippers are single acting (there is one stationary, and one moving jaw). These grippers are ideal for holding large, heavy (50-300 lbs) parts. The STD-G series of grippers are an excellent choice for lift assists (crane or manipulator hung end effectors).
Our pneumatic grippers use high quality, re-circulating rail type linear bearings to support the moving jaw. Many competing solutions rely on telescoping sliders to support the moving jaw(s); these support substantially lower load at full stroke than when at minimum stroke. As a consequence these solutions cannot grip a part as far out from the gripper bodies as our grippers can.
All grippers ship standard with pilot operated check & flow control valves on both cylinder ports. The pilot operated (PO) check valves trap air in the event of a pneumatic failure (allowing the gripper jaws to maintain grip). The flow controls allow the opening and closing speed of the manipulator to be controlled.
Features And Benefits
- High moment capacity, part can be held a great distance from the gripper
- High quality re-circulating ball, linear rail bearings (THK)
- High quality double acting cylinders (SMC)
- Pilot operated check valves included for extend and retract
- Velocity of cylinder extend/retract can be adjusted independently
- In the event of air failure, the jaws will remain gripped
- Lightweight anodized aluminum chassis
- Many possible mounting arrangements
- Additional screw locations on gripper side plates for guarding
- Integral ‘part gripped’ sensor
- An adjustable hard stop is provided to fine tune gripper stroke
- Ideal for Cranes, Manipulators, End Effectors, End of Arm Tooling
Technical Information
IN ORDER TO SIZE A GRIPPER, TWO MOMENTS MUST BE CALCULATED:
The jaw moment is the bending load imposed on the linear rails inside of the gripper by the gripping force acting at some distance. The grip force for each model of gripper is listed in the tables below, as is the jaw moment rating referred to in the following formulas.
HORIZONTAL MOUNTING
JAW MOMENT = GRIP FORCE x L2
MOMENT ‘A’ = (LOAD x L1) + (JAW SELF WEIGHT x JAW CENTER OF GRAVITY (FROM CYLINDER))
VERTICAL MOUNTING
JAW MOMENT = (GRIP FORCE+LOAD) x L2
MOMENT ‘B’ = (LOAD x L1) + (JAW SELF WEIGHT x JAW CENTER OF GRAVITY (FROM CYLINDER))
DOWNWARD FACING
If the gripper is to be used to lift a load vertically while facing the ground, and the part is held by friction only, then normally only the jaw moment needs to be calculated: JAW MOMENT = GRIP FORCE x L2.
If the load is held mechanically, the combined bending and normal loading on the linear bearing will need to be calculated.
Specifications
STD-G24 GRIPPER
Stroke: 3.9″
Grip Force (@100psi): 160 lbf
Maximum Pressure: 120 psi
Weight: 10 lbf
Jaw Moment: 1800 in*lbf
Body Moment (‘MA’): 2000 in*lbf
Body Moment (‘MB’): 1500 in*lbf
STD-G31 GRIPPER
Stroke: 1.4″
Grip Force (@100psi): 255 lbf
Maximum Pressure: 120 psi
Weight: 7 lbf
Jaw Moment: 3000 inlbf Body Moment (‘MA’): 3000 inlbf
Body Moment (‘MB’): 1200 in*lbf
STD-G46 GRIPPER
Stroke: 5.9″
Grip Force (@100psi): 255 lbf
Maximum Pressure: 120 psi
Weight: 18 lbf
Jaw Moment: 4600 inlbf Body Moment (‘MA’): 4600 inlbf
Body Moment (‘MB’): 3000 in*lbf
STD-G54 GRIPPER
Stroke: 3.9″
Grip Force (@100psi): 435 lbf
Maximum Pressure: 120 psi
Weight: 20 lbf
Jaw Moment: 5000 inlbf Body Moment (‘MA’): 5000 inlbf
Body Moment (‘MB’): 5000 in*lbf
STD-G56 GRIPPER
Stroke: 5.9″
Grip Force (@100psi): 435 lbf
Maximum Pressure: 120 psi
Weight: 23 lbf
Jaw Moment: 5000 inlbf Body Moment (‘MA’): 5000 inlbf
Body Moment (‘MB’): 5000 in*lbf
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