| Test | Primary use / objective | Advantage (pro) | Risk if skipped (con) |
|---|---|---|---|
| Dial Test | Measure and verify basic tool deflection and runout | Minimises deflection, significantly increases drilling accuracy | High deflection leads to increased runout issues and drilling errors |
| Torque Test | Evaluate collet quality and clamping force | Increases holding strength and stability of the drill bit | A loose hold can cause tool slippage, leading to drill or workpiece damage |
| Radial Test | Monitor air pressure within the bearing | Extends shaft life by eliminating friction and wear | Pressure failures cause bearing damage and unplanned downtime |
| Thrust Test | Check air pressure between the bearing and power board to ensure shaft balance | Increases shaft longevity and improves drilling quality | Improper pressure can damage bearing, power board, or shaft, causing sudden failure |
| Pull Test | Verify structural integrity and axial hold | Ensures assembly remains secure under high-tension loads | Excessive deflection leads to increased runout and tool breakage |
| Deflection Test | Measure actual dynamic runout while the spindle is in operation | Improves finished hole quality and extends spindle service life | Excessive deflection leads to increased runout and tool breakage |