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Notes on cutting large gears, shafts and castings: the order of operations, what the material and the heat treatment decide, and the details a drawing tends to leave out.

Close-up of a large-module gear ring's teeth, showing machined flanks and a golden anti-rust coating on the shop floor.

Case studies

Large-module gear ring passes final inspection before export

The gear ring was machined from an alloy steel forged blank on large CNC equipment, with tooth spacing, profile tolerance, and surface finish checked before shipment. It is built for continuous operation in mining, metallurgy, and heavy engineering drive systems.

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A worker stands beside a large finish-machined forged steel backup roll in the workshop, with crane and columns behind.

Case Study

Large forged steel backup rolls finished and inspected

Multiple large forged steel backup rolls completed finishing in the heavy workshop, with even body hardness and qualified form and position tolerances, and have passed factory inspection. The parts are made in-house from open-die forging through quenching and tempering to CNC finish turning.

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Four-segment large girth gear bolted to the shell in the assembly workshop, with a laser tracker set up alongside to check concentricity

Industry News

In-House Pre-Assembly of Split Girth Gears and the Nine-Step Assembly Method

Tooth alignment, concentricity and bolt-hole registration are verified before shipment, leaving only bolting and re-measurement on site. The nine-step assembly method puts shell assembly, bearing-seat alignment, girth gear installation and trial running into a controlled sequence, while synchronous jacking and lowering lets sites without large lifting equipment carry out the installation.

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Herringbone gear with two opposing helices on one face width

Gears

Herringbone gears: how they work and where they are used

Two opposing helices share one face width. The axial thrust cancels out, while twice the tooth surface is in mesh. Why herringbone gears suit heavy, high-power drives — and where the difficulty starts.

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Split ring gear on timber bearers in the Linyao workshop

Gears

Why split ring gears are trial-assembled in our shop

A split ring gear is worth having because it can be fitted to a machine already in place — on the condition that the two halves were already matched in the shop. The joint, the dowel holes and the pitch cannot wait until the part is on site.

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