What Information Is Required for a Custom Gear Quotation?
A faster quotation starts with better technical information
A custom gear quotation is not based on diameter and tooth count alone. The manufacturer must understand what is being made, how it will operate, which processes are required and how many parts are needed. When these inputs are clear, the quotation can be more technically meaningful and the risk of repeated clarification is reduced.
You do not need to have every engineering detail before contacting a manufacturer. The practical goal is to send all information currently available and clearly identify what is unknown. A good supplier should separate confirmed requirements from assumptions and ask for clarification where necessary.
1. Technical drawing or available CAD data
The most useful starting point is the latest controlled technical drawing. It should define the component geometry and, where applicable, gear data, interfaces, tolerances, material and heat-treatment requirements. A 3D model can support the review, but it should not automatically be treated as a replacement for missing manufacturing requirements.
If the drawing is old, mark whether it is still the current revision. If several files describe the same part, indicate which one controls the quotation. This simple step helps prevent a supplier from pricing the wrong revision.
2. Gear and interface information
For gear components, the technical definition may include tooth count, module or diametral pitch, pressure angle, helix information where applicable, gear width and other geometry required to manufacture and inspect the teeth. The component also needs its non-tooth features: bore, shaft, spline, keyway, thread, shoulder, groove and mounting interfaces.
Not every drawing uses the same standard or notation. The important point is that the functional geometry is unambiguous. If a value is unknown, identify it as unknown rather than estimating it.
3. Material, heat treatment and hardness requirements
Material and heat treatment can significantly change both the production route and the quotation. State the required material grade when it is defined. If the application specifies carburising, nitriding, hardening or another heat-treatment route, include that information together with any required hardness or case-related specification available in the drawing.
When material or heat treatment has not yet been selected, provide the operating conditions instead. That allows the requirement to be discussed as an engineering question rather than silently substituting a material.
4. Quantity and purchasing pattern
State the quantity for the quotation and, if relevant, the expected annual or repeat demand. A request for one prototype, 20 first-off parts and a repeat requirement can lead to different setup and tooling decisions.
If the project is still at development stage, say so. The manufacturer can then distinguish prototype economics from a future serial-production scenario. Avoid presenting an uncertain annual forecast as a guaranteed order; a realistic estimate is more useful for process planning.
5. Application and operating conditions
Application data becomes especially important when the drawing is incomplete or a new design is being developed. Useful inputs can include torque, speed, load characteristics, operating environment, mating components and the function of the gear within the system.
This information does not replace the drawing for a controlled production part, but it helps the manufacturer identify inconsistencies and understand which features may be critical. For a new gear design, these inputs become the basis of the engineering review.
6. Inspection, documentation and special requirements
If your purchasing process requires specific inspection records, critical-dimension reporting, material documentation, marking, packaging or other deliverables, include them in the RFQ. Requirements introduced after pricing can change the production and inspection workload.
The same principle applies to tolerances and gear quality. Do not assume that a manufacturer will apply a particular DIN or ISO grade unless it is specified or agreed. The quotation should be based on the actual technical requirement, not a generic precision claim.
What if there is no drawing?
If the existing component is available but the technical drawing is missing, send photographs and application information and state whether the physical sample can be shipped. The project can then be evaluated through reverse engineering rather than drawing-based manufacturing.
This distinction is important: manufacturing from a controlled drawing and reconstructing technical data from a used component are different engineering workflows and should be quoted accordingly.
Send the available information — not a perfect RFQ
A useful RFQ does not need to be perfect. Send the drawing or sample information, quantity, application and the technical requirements you know. Cimak Gear can identify the missing points during technical review and prepare the project for a manufacturing quotation.