40CrNiMo ball head for glass machinery linkages, turned and ground so the sphere runs smoothly in its socket.
Values below are the standard range keytrond holds for this part family. Tighter requirements are reviewed against the drawing before quotation.
| Tolerance range | Sphere ±0.01 mm, shank IT7 |
|---|---|
| Surface roughness | Ra 0.4 on sphere |
| Common materials | 40CrNiMo, 40Cr |
| Surface treatment | Quenching and tempering, Blackening, Grinding |
| Machining processes | CNC Turning, Grinding, Heat Treatment |
| Max machining size | Ø10 - Ø80 mm |
| Applicable industries | Glass Machinery |
| Minimum order | 5 pcs for sample, 100 pcs for batch |
| Lead time | Sample 5-8 days, batch 10-15 days |
| Drawing requirement | Please specify sphere diameter and tolerance, shank thread, hardness and mating socket size. |
Ball heads are used in linkage and adjustment points on glass machinery, where a rod has to move through a small angle without play. The sphere runs inside a matching socket, so roundness and surface finish decide how smooth the movement feels.
The part is turned from 40CrNiMo bar, quenched and tempered, then the sphere is ground and the shank finished to IT7. After blackening, each piece is checked for sphere diameter and roundness before packing.
| Inspection item | Method and instrument |
|---|---|
| Sphere diameter | Micrometer at three directions |
| Roundness | V-block and dial indicator |
| Shank thread and fit | Thread gauge and micrometer |
A first article inspection report with dimensional results, material certificate and heat treatment record is provided for sample orders. Batch orders are sampled at 10 percent, with full inspection available on request.
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