Sprockets and Drive Components — Where the Chain Meets the Machine
The sprocket is the interface between the drive system and the chain or track it drives. In mining applications — AFC face conveyors, scraper conveyors, and haulage systems — this interface operates under high cyclic load, in abrasive and often wet conditions, with limited access for inspection and maintenance. Sprocket performance directly determines chain wear rate and replacement interval: a sprocket with worn or dimensionally inaccurate tooth geometry accelerates chain elongation and increases the dynamic loading on every chain link with every revolution.
We produce sprockets and related drive components for mining and industrial applications to OEM drawings, in materials and by manufacturing processes matched to the load and wear requirements of each application.
Forged and Machined Sprockets
Mining drive sprockets — particularly for AFC and scraper conveyor systems — are produced by forging in alloy steel, followed by machining of all functional surfaces. Forging aligns the grain structure with the tooth profile and provides the fatigue resistance at the tooth root that the cyclic chain engagement load demands. The tooth root is the highest-stress location in the sprocket; it is also where fatigue cracks initiate when the material is inadequate for the load.
After forging and heat treatment to the specified hardness, tooth profiles, bore dimensions, keyway geometry, and mounting interfaces are machined to drawing tolerances. For sprockets where tooth face wear resistance is the primary service life constraint, induction hardening of the tooth faces after machining produces a hard surface layer — typically 55–62 HRC — over a tough core that absorbs the impact of chain link engagement without fracture.
Tooth profile accuracy determines how chain load is distributed across the tooth face at engagement and disengagement. An inaccurate profile concentrates the engagement load on a small contact area, accelerating both tooth wear and the chain link wear that mirrors it. We produce tooth profiles to the geometry specified in the OEM drawing, verified by tooth profile measurement after machining.
AFC Drive Sprockets
AFC drive sprockets engage the scraper chain at the head and tail drives, transmitting the drive torque to the chain and returning the chain to the face. The tooth geometry is specific to the chain link dimensions and pitch — AFC chains are not standardised across manufacturers, and sprocket geometry is specific to the chain specification it is designed to engage.
We supply AFC drive sprockets to the dimensional specifications of the chain systems we supply components for, in alloy steel grades and to the heat treatment specifications required for the operating conditions of the face conveyor. For sprockets supplied as part of an ongoing AFC component supply relationship, tooth geometry is maintained to the approved drawing across production batches, ensuring that replacement sprockets are dimensionally consistent with the chain in service.
Cast Drive Components — Gear Blanks and Couplings
Not all drive components are forged. Gear blanks — the rough form from which gear teeth are subsequently cut — for large industrial gearboxes are commonly produced by casting in alloy steel, with subsequent normalising or quench-and-temper heat treatment before gear cutting. The casting process is appropriate for gear blank geometries where the section transitions and web features would require complex tooling to forge, and where the gear cutting operation that follows will in any case generate the final tooth geometry.
We produce gear blanks to OEM drawings in alloy steel grades specified for the gear’s application. Blank dimensions — outside diameter, bore, web thickness, and face width — are held to the tolerances required for subsequent gear cutting without further stock removal beyond what the gear cutting process itself removes.
Couplings for mining drive systems — jaw couplings, disc couplings, and rigid flange couplings — are produced by casting or forging depending on the geometry and load requirements. For couplings where dimensional accuracy at the pilot bore and mounting flange is critical to drive alignment, finish machining to drawing tolerances is performed after heat treatment.
Bearing Housings and Mounting Components
Bearing housings for mining drive systems — pillow block housings, split housings, and flanged housings for conveyor drive shaft bearings — are produced by casting in alloy or grey iron, with machining of bore, mounting faces, and seal interfaces. Bore diameter and position determine bearing fit and shaft alignment; these dimensions are verified by CMM before release.
For bearing housings in critical drive positions where misalignment causes premature bearing failure, the relationship between bore position, mounting face flatness, and the assembled shaft alignment is a system property, not just a component tolerance. We produce housings to the dimensional specification on the OEM drawing and provide the measurement data that allows the assembler to verify the housing’s contribution to the assembled alignment.
For sprocket and drive component enquiries, contact our engineering team with the chain specification or drive system drawing. See also: Precision Cast Components overview · Closed-Die Forging · Investment Casting.