Precision ground shaft used as a linear measuring and guiding element, with controlled straightness over full length.
Values below are the standard range keytrond holds for this part family. Tighter requirements are reviewed against the drawing before quotation.
| Tolerance range | Ø IT6, ±0.005 mm |
|---|---|
| Surface roughness | Ra 0.4 |
| Common materials | GCr15, 40Cr, 45#, SUS304 |
| Surface treatment | Hard chrome plating, Nitriding, Blackening |
| Machining processes | CNC Turning, Grinding, Heat Treatment, Surface Finishing |
| Max machining size | Ø8 - Ø120 mm, length up to 1500 mm |
| Applicable industries | Glass Machinery, Woodworking Machinery, General Automation |
| Minimum order | 1 pc for sample, 50 pcs for batch |
| Lead time | Sample 5-7 days, batch 10-15 days |
| Drawing requirement | Please mark diameter tolerance, straightness, surface roughness, hardness and effective length on the drawing. |
Scale shafts are used as the reference element in linear measuring devices and as guiding shafts in glass and woodworking machinery. Because the shaft works as both a measuring datum and a sliding surface, diameter consistency, straightness and surface finish decide the service life of the whole assembly.
Production starts from hot rolled or drawn bar stock. After sawing to length with machining allowance, the shaft is rough turned on a CNC lathe, leaving 0.4 mm stock on the diameter. Quenching and tempering follow, then straightening on a press with dial indicator feedback. Cylindrical grinding removes the stock in two passes, and the final pass runs at low feed to reach Ra 0.4 without burn marks.
Hard chrome plating is applied when the shaft works in a wet or dusty environment, such as glass washing lines. Nitriding is preferred where dimensional stability matters more than corrosion resistance. After finishing, each shaft is cleaned, oiled, wrapped in anti-rust paper and packed in wooden cases for batch orders.
| Inspection item | Method and instrument |
|---|---|
| Diameter and tolerance | Micrometer and bore gauge, three sections |
| Straightness | V-block and dial indicator on surface plate |
| Surface roughness | Roughness tester, Ra 0.4 target |
| Hardness | Rockwell tester, HRC 58-62 after quenching |
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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