Low Price Tennis Ball on Elastic – Industrial Training Device

A tennis ball fixed to an elastic cord provides a repeatable impact target for training machines, durability test rigs, and automated ball‑launch systems. The assembly mimics the mass and rebound characteristics of a standard tennis ball while allowing controlled recoil through the elastic element.

Construction & Materials

The ball core consists of a pressurized rubber bladder wrapped in a woven nylon felt, identical to competition‑grade tennis balls. The elastic cord is made from extruded thermoplastic polyurethane (TPU) with a Shore A hardness of 85, selected for its high tensile strength and resistance to UV degradation.

End fittings are molded from acetal copolymer, providing a low‑friction interface that prevents slippage under cyclic loading. All components are chosen for compatibility with standard cleaning solvents and operate within a temperature range of –20 °C to +60 °C.

Mechanical Properties

Key performance parameters are measured per ASTM F1887 for ball rebound and ISO 527‑1 for elastic modulus.

• Ball diameter: 65.41 mm ± 0.30 mm
• Ball mass: 56.7 g ± 0.5 g
• Elastic cord tensile strength: ≥ 45 MPa
• Elastic modulus (TPU): 12 MPa ± 2 MPa
• Maximum safe stretch: 250 % of original length
• Fatigue life: > 150 000 impact cycles at 2 Hz

Typical Applications

Industrial buyers use this device in automated serve‑simulation rigs where consistent ball impact is required for racket wear testing. It also serves as a low‑cost target in robotic vision calibration setups, providing a recognizable object with known inertial properties.

In production line quality control, the assembly verifies the launch speed and angle of ball‑feeding mechanisms, reducing false rejects caused by variable projectile dynamics.

Customization Options

• Alternative felt finishes (e.g., low‑nap for reduced friction)
• Elastic cord diameter ranging from 3 mm to 8 mm to adjust force‑deflection curve
• End‑fitting threading options (M5, M6, or custom stud) for direct mounting
• Color‑coding of the elastic strand for visual alignment in multi‑station fixtures
• Pre‑tensioned configurations delivering a specific initial force (e.g., 10 N, 20 N)

Quality Assurance

Each lot undergoes dimensional inspection using laser micrometry (± 0.01 mm) and mass verification with analytical balance (± 0.01 g). Elastic cords are proof‑loaded to 1.5× rated tensile strength and inspected for surface defects via 10× magnification.

Rebound height is measured against a standardized steel plate; acceptance criteria require a coefficient of restitution between 0.75 and 0.80. Documentation includes a material certificate of conformance and a test report per lot.

Specification Table

Frequently Asked Questions