Function and interfaces
A gearbox housing locates rotating components and maintains their relationships under load and temperature. Begin with the bearing arrangement, shaft center distances, flange datums and lubrication boundary. Separate the dimensions that position gears from the external cast outline. Loads from the mounting feet and fasteners need a defined path into the supporting walls.
Casting and machining review
Review cored passages, local thick sections and machining access before the die design. Where opposite bearing bores share an axis, plan the setup and inspection together. Gasket lands and plugs need a specified finished-state seal requirement. Coating should not build unpredictably on bearing seats or mating faces.
Requirements to define
| Interface | Review requirement |
|---|---|
| Bearing seats | Bore size, alignment and datum relationship |
| Split or cover flange | Flatness, fastening and gasket geometry |
| Lubrication boundary | Local soundness and agreed leak test |
| Mounting feet | Load path, machined pads and bolt access |
Example of a project decision
For a two-shaft design, inspect the specified center-distance relationship rather than accepting each bore diameter separately. Share the mating shaft and bearing definition with the RFQ.
Information for a quotation
Send the controlled 3D model and drawing, material specification, finish, order quantities and delivery needs. Include mating parts, critical characteristics and required test records. The quotation should identify the casting, machining, finishing and inspection scope, together with any open decisions. Request a drawing review.