Belt and Cord Friction Apparatus | FrixoDynamics FX-519

Key Features

Key Features

• Three belt types, flat belt (leather/polyamide), V-belt (ISO 4184, rubber/fabric), and round belts (rubber, 8 mm and 10 mm), allow direct comparison of friction coefficients across belt profiles
• Contact angle adjustable from 30° to 210° in 30° increments for systematic verification of the Eytelwein formula's angle dependency
• Ball bearing-mounted 150 mm cast iron pulley with three dedicated grooves ensures correct belt seating for each belt type
• Two calibrated weight sets provide the tight-side and slack-side tension loading for friction coefficient determination
• Consequences of incorrect belt alignment demonstrable directly on the apparatus
• Portable metal stand, self-contained, no wall mounting or power supply required
• Covers flat belt versus V-belt versus round belt friction comparison in a single apparatus
• Results directly comparable against Eytelwein's rope friction formula theoretical predictions

Applications

• Determination of the coefficient of friction for flat belt, V-belt, and round belt on a cast iron pulley
• Experimental verification of Eytelwein's rope friction formula
• Investigation of the influence of contact angle on the tension ratio and friction coefficient
• Comparison of friction behaviour across flat belt, V-belt, and round belt profiles
• Study of the consequences of incorrectly aligned belt on friction and slip
• Investigation of the relationship between belt tension, contact angle, and belt drive slip
• Undergraduate laboratory practicals in mechanical engineering, tribology, machine elements, and power transmission

Construction and System Design

The FX-519 is mounted on a portable metal stand that provides a stable, upright support for the pulley assembly without requiring bench clamping or wall fixing. The 150 mm diameter anodised cast iron pulley is mounted on precision ball bearings, minimising rotational friction at the shaft and ensuring that the resistance measured during the experiment reflects belt-pulley friction rather than bearing losses. Three grooves are machined into the pulley periphery, a flat groove for the flat belt, a V-profile groove matching the ISO 4184 A-type profile, and a round groove for the 8 mm and 10 mm round belts.

The contact angle is set by positioning the belt on the pulley at the required wrap angle and confirming the angle against the graduated scale on the frame. The scale is marked at 30° intervals from 30° to 210°, covering the full practical range of belt wrap angles encountered in drive systems. One end of the belt is attached to a load hanger from which the slack-side weight is suspended. The cord on the opposite side of the pulley carries the tight-side hanger. Weights are added to the tight-side hanger until the pulley rotates against the slack-side load, establishing the critical tension ratio at the point of impending slip.

The flat belt is of leather and polyamide construction at 15 x 2.2 mm cross-section. The V-belt conforms to ISO 4184 standard A-type profile at 12 x 10 mm, manufactured from rubber and fabric. Two round belts of 8 mm and 10 mm diameter, both in rubber, provide additional belt geometry comparisons. The range of belt materials and profiles ensures that the friction coefficient results obtained span a meaningful range, clearly demonstrating how belt design influences frictional performance in practical drive applications.

Export and Supply Capability

The SCIENTICO FrixoDynamics FX-519 is available for supply to engineering colleges, technical universities, mechanical engineering departments, research institutions, and industrial training centres. SCIENTICO manufactures and exports laboratory equipment to institutions and distributors across multiple regions. Standard packaging is suitable for international shipment. Bulk orders, customised configurations, and institutional procurement enquiries are welcomed. Please contact SCIENTICO directly for pricing, lead times, and shipping terms.

Standards & Compliance

• Manufactured under ISO 9001:2015 Quality Management System
• CE Marking - European Conformity where applicable
• Supplied with calibration certificate, operation manual, and experiment guide
• 12-month manufacturer's warranty (parts & labour from installation)

Ordering & Delivery

• Incoterms: CIF to destination seaport, FOB Mundra/Nhava Sheva, or Ex-Works Ambala
• Lead time: 3–5 weeks production + sea transit to destination
• Payment: LC (Letter of Credit) or T/T bank transfer against proforma invoice
• Documentation: commercial invoice, packing list, bill of lading, certificate of origin, insurance certificate

Frequently Asked Questions

Q1: What is Eytelwein's rope friction formula, and how does the FX-519 verify it?

Eytelwein's rope friction formula states that the ratio of the tight-side tension to the slack-side tension in a belt wrapped around a pulley is equal to e raised to the power of the product of the friction coefficient and the contact angle in radians. The FX-519 verifies this by measuring both tension values at a series of contact angles for each belt type, calculating the implied friction coefficient from the tension ratio, and confirming that the result remains consistent across angles, as the formula predicts.

Q2: What belt types are included with the FX-519, and why are three types provided?

Three belt types are included: a flat belt (15 x 2.2 mm, leather/polyamide), a V-belt (ISO 4184 A-type, 12 x 10 mm, rubber/fabric), and two round belts (8 mm and 10 mm diameter, rubber). The three types represent the main belt drive profiles used in engineering practice. Each profile contacts the pulley differently, the flat belt on its surface, the V-belt on its flanks, and the round belt in its groove, resulting in different effective friction coefficients that students can measure and compare directly.

Q3: How is the angle of contact set and measured on the FX-519?

The angle of contact is set by wrapping the belt around the pulley to the required wrap angle and positioning it against the graduated scale on the metal stand frame. The scale is marked at 30° intervals from 30° to 210°, allowing the contact angle to be selected and confirmed without additional measuring instruments. Experiments are typically conducted at each marked angle increment, generating a dataset that spans the full practical range of belt contact angles.

Q4: What is the practical significance of studying belt friction in engineering?

Belt friction determines the maximum power that can be transmitted by a belt drive without slip, the rate of belt wear, and the efficiency of energy transfer between the driving and driven shafts. If friction is too low, the belt slips under load, reducing power transmission and causing rapid wear. If friction is excessive, energy losses increase and belt life is reduced. Understanding the Eytelwein relationship allows engineers to select the correct belt type, contact angle, and tension for a given drive application.

Q5: What is included in the scope of delivery for the FX-519?

The FX-519 is supplied as a complete experimental kit including: one belt friction experimental unit with 150 mm cast iron ball bearing-mounted pulley and portable metal stand; one flat belt (leather/polyamide, 15 x 2.2 mm); one V-belt (ISO 4184 A-type, rubber/fabric); two round belts (8 mm and 10 mm, rubber); two sets of calibrated weights (1 x 1 N hanger, 1 x 0.5 N hanger, 5 x 5 N, 4 x 2 kg, 1 x 1 kg); one thread; and one instructional manual covering experimental procedures, Eytelwein formula application, and data recording guidance.