Example 4: Gears for Vacuum Pumps – Helical Gears
Wen-Hsiang machines high-precision helical gears for vacuum pumps. The high-quality helical gears, compared with, for example, spur gears, create less noise when a pump operates at a medium or high speed. Wen-Hsiang cares about the optimal tooth strength and load-carrying capacity of machined helical gears that ensure vacuum pumps' smooth and quieter operation.
| Steps | Measurement items | Dimensions |
| Raw metal inspection | Inspect whether the raw metal matches the description in the material certificate. | |
| Lathing | Dimensional Measurement | Diameter, bearing spacing, depth |
| Milling | Dimensional Measurement | Form and size measurement, compared with scanning and PCD results (pitch diameter, symmetry) |
| Rough hobbing | Gear Test | External tooth profile, lead, pitch, tooth span, tooth profile |
| Heat treatment | Hardness test | Tests for checking material characteristics, hardness, and metallographic examination |
| Grinding (Youdo) | Height measurement, surface roughness, inner diameter, outer diameter | |
| Skiving | Pitch |