Must cylindrical 151.37.235 gears use inspection mandrels?

Cylindrical gears do not necessarily require inspection mandrels; their use depends on the gear's structural type, precision requirements, and inspection items.

1. Scenarios Requiring Inspection Mandrels

Shaft-type gears (gear shafts) or disc-type gears with internal bores

For these gears, the internal bore serves as the mounting reference. When inspecting critical precision metrics such as radial runout of the gear ring, pitch deviation, and total profile deviation, the gear must be clamped via its internal bore onto an inspection mandrel matching the mounting reference. The mandrel is then mounted on a center or V-block.

The inspection mandrel simulates the gear's actual working mounting state, ensuring alignment between the inspection reference and assembly reference. This prevents measurement distortion caused by mounting errors, making it particularly suitable for high-precision gears (e.g., grades 5-8).

Standardized gears in mass production

During batch inspection, the inspection mandrel enhances mounting efficiency and measurement consistency while minimizing errors from varying mounting methods. It is ideal for rapid quality sampling on production lines.

2. Scenarios Where Inspection Mandrels Are Unnecessary

Gears Without Bores (e.g., cantilever gears, welded gears)

These gears lack internal bores for clamping. During inspection, the gear's outer circumference or end face is typically used as an auxiliary reference, secured with specialized fixtures, eliminating the need for inspection mandrels.

Low-precision gears (e.g., Grade 9 and below)

For gears with low precision requirements, basic dimensions like tooth tip diameter and tooth thickness can be measured directly using calipers or micrometers without inspection mandrels, simplifying the inspection process and reducing costs.

Direct Inspection with Dedicated Equipment

When using high-precision equipment like gear measuring centers, the gear can be clamped directly via self-centering fixtures without additional inspection mandrels. The equipment's built-in positioning system ensures the accuracy of the inspection reference.

3. Considerations in Practical Applications

Inspection Accuracy Requirements: If inspection items demand high precision, such as geometric tolerance inspection for high-precision gears, the use of inspection mandrels is necessary.

Inspection Efficiency: In certain scenarios, inspection mandrels may increase testing complexity and time costs. Therefore, in applications demanding high inspection efficiency, a trade-off between precision and efficiency may be required.

Cost Considerations: The manufacturing and maintenance costs of inspection mandrels are also factors to consider. For low-precision or temporary inspection tasks, high-precision inspection mandrels may not be necessary.