What value should the acceleration factor take?

Start at 1 for a part held still and add the peak acceleration in g plus the worst tilt. A fast pick and place often reaches 3 to 5 g; read the program or measure the move.

Where does the friction factor come from?

It is 1 divided by the static friction coefficient between the jaw pad and the part surface. Rubber on steel holds better than steel on steel; a form closure that traps the part shape does not rely on friction.

Is the safety factor already in the g factor?

No. The g factor accounts for load dynamics; the safety factor covers unknowns such as wear, debris and tolerance stack. Keeping them separate lets you review each assumption on its own.

Why is the part weight in lb and the force in lbf?

One pound of mass under standard gravity exerts one pound-force, so the numbers line up when the acceleration factor is a multiple of g. NIST fixes standard gravity at 9.80665 m/s².

Robotics & Automation calculator

Gripper Force Calculator

Size a gripper clamp from part mass, worst acceleration and orientation, jaw friction and a safety factor. One lb under one g of acceleration needs one lbf of support, so the factors stay in datasheet units.

What this calculator does

Gripper clamp force needed to hold a part through robot acceleration, jaw friction and a safety margin.

Formula used

Weight support demand (lbf) = part weight (lb) × acceleration and orientation factor (g)
Friction closure demand (lbf) = weight support demand × friction factor (1/mu)
Required force (lbf) = friction closure demand × safety factor
Safety margin (lbf) = required force − friction closure demand

Inputs explained

Part Weight at the Jaws: Mass the jaws hold, from part drawings or a scale.
Acceleration and Orientation Factor: Dynamic multiplier over gravity for moves and jaw orientation.
Friction or Form Closure Factor: Inverse friction coefficient for the jaw material pair, from tests.
Safety Factor: Design margin over the calculated holding demand.

How to use the result

Best suited to sizing jaws for a machine tending cell, comparing friction pads with form closure, checking a gripper against a faster move.
Holding force is only one check: confirm jaw reach, part deflection and surface marking at the chosen pressure. Friction drops with wear, oil and dust; retest pads and raise the factor for rough handling.

Current U.S. benchmarks

Global copper trades at $13,543 per tonne (IMF via FRED, Jul 2026), up 38.6% in a year, and U.S. industrial electricity averages 9.77 cents per kWh. Both feed electrified-hardware unit economics.

Common questions

What value should the acceleration factor take? Start at 1 for a part held still and add the peak acceleration in g plus the worst tilt. A fast pick and place often reaches 3 to 5 g; read the program or measure the move.
Where does the friction factor come from? It is 1 divided by the static friction coefficient between the jaw pad and the part surface. Rubber on steel holds better than steel on steel; a form closure that traps the part shape does not rely on friction.
Is the safety factor already in the g factor? No. The g factor accounts for load dynamics; the safety factor covers unknowns such as wear, debris and tolerance stack. Keeping them separate lets you review each assumption on its own.
Why is the part weight in lb and the force in lbf? One pound of mass under standard gravity exerts one pound-force, so the numbers line up when the acceleration factor is a multiple of g. NIST fixes standard gravity at 9.80665 m/s².

Last reviewed 2026-10-01.