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Hertzian Contact Apparatus
Hertzian Contact Apparatus (Product Code: SLE/ETM/09) is a self-contained bench unit used to show how two curved surfaces meet under load, so that measured contact shapes can be checked against Hertz’s original theories in engineering laboratories. Mechanical engineering students use it because the lower pad rotates against a pointer, turning the contact zone from circular to elliptical. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Type | Self-contained, easy-to-use contact mechanics unit |
| Loading | Hand-operated hydraulic pump and cylinder force the two pads together |
| Contact pads | Two pads with curved contact surfaces; the upper pad has compound radii |
| Lower pad | Rotatable, with a pointer showing the angle of rotation |
| Contact zone | Circular or elliptical, depending on the relative angular position of the pads |
| Measuring aid | Transparent scale (supplied) to measure contact shape and angle |
| Overload protection | Locknuts on the pump threads limit the maximum pressure |
| Theory compared | Hertz’s original contact theories |
| Product code | SLE/ETM/09 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Hertzian Contact Apparatus Used For?
Whenever a ball meets its race, a gear tooth meets its mate or a wheel rolls on a rail, the load passes through a very small patch of contact, and the size and shape of that patch decide the contact stress. This apparatus lets a class see that patch for itself. The hydraulic cylinder presses the two curved pads together, students read the contact outline with the transparent scale, and the result is compared with the size predicted by Hertz theory.
Turning the lower pad changes the relative curvature of the two surfaces, because the upper pad has compound radii. At some angles the contact is circular; at others it stretches into an ellipse, which makes the unit a practical piece of engineering lab equipment in India for tribology, machine design and theory of machines courses. Record the pointer angle for every reading, and leave the pump locknuts at their set position so the maximum pressure stays limited.
OEM Manufacturer
The Hertzian Contact Apparatus is built by Jain Scientific Equipments Private Limited, which trades as ScienceLab, at its own licensed factory at Saha, Ambala, Haryana, India. Because the maker supplies it factory-direct, engineering colleges, polytechnics, dealers and importers deal with the people who assemble the pads, pump and scale — for quotations, repeat orders and replacement parts, ask us.
Company background is on the ScienceLab profile.
Related Theory of Machines Equipment
Contact, bearing and gearing experiments that fit the same course:
- Journal Bearing Demonstration — moves from dry contact to a lubricated rotating bearing.
- Michell Pad Apparatus — shows how an oil film carries load in a tilting pad bearing.
- Cam Analysis Machine — a cam and follower is another curved contact under changing load.
- Gear Train Model — for discussing where gear teeth touch and transmit force.
Browse the full Theory of Machines range.
Frequently Asked Questions
What does the Hertzian Contact Apparatus demonstrate?
The Hertzian Contact Apparatus demonstrates the nature of contact between two curved surfaces under load. Students measure the contact shape and compare it with predictions from Hertz’s original theories, and they see how changing the relative curvature changes the contact zone.
How is the load applied?
On the Hertzian Contact Apparatus SLE/ETM/09, a hand-operated hydraulic pump and cylinder force the two pads together. Locknuts on the threads of the pump limit the maximum pressure, which protects the pads and the rest of the equipment from damage.
Why does the contact zone change from circular to elliptical?
In the Hertzian Contact Apparatus, the upper pad has compound radii, so rotating the lower pad changes the relative curvature at the point of contact. Depending on the angle shown by the pointer, the contact zone is circular or elliptical.
What is included with the Hertzian Contact Apparatus?
The Hertzian Contact Apparatus comprises two pads with curved contact surfaces, a rotatable lower pad with pointer, and a hand-operated hydraulic pump and cylinder. A transparent scale for measuring the contact shape and angle is supplied with it.
Who manufactures the Hertzian Contact Apparatus?
Jain Scientific Equipments Pvt Ltd, trading as ScienceLab, is the OEM manufacturer of the Hertzian Contact Apparatus SLE/ETM/09. It is produced at the company’s own licensed factory at Saha, Ambala, Haryana, India, and sold direct by the maker.
Can I get a calibration certificate with the Hertzian Contact Apparatus?
Calibration paperwork for the Hertzian Contact Apparatus is not described in its listing. If your institution needs a calibration certificate, mention it when you request a quotation and we will discuss what can be provided.
What should I include in a quotation request?
For the Hertzian Contact Apparatus SLE/ETM/09, state the number of units, the institution or dealer name and the delivery location in India or abroad. Send these details through the ScienceLab contact page and the quotation comes straight from the manufacturer.
Request a Quote
To order the Hertzian Contact Apparatus (SLE/ETM/09), send your requirement through the contact page or add it to the enquiry cart. Quotations are issued directly by the manufacturer, for single labs, bulk orders and export.
Last updated: 24 September 2026
