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Disc stylus performance
Test setup criteria
Test site | Renishaw UK |
|---|---|
Styli used | Renishaw's M3 stylus range |
CMM specification | U3 = 0.48 µm + L / 1000 |
CMM controller | Renishaw's UCC2 |
Probe calibration | Renishaw's third order polynomial calibration method |
Data filter used | Harmonic simple cut off order = 60 UPR (undulations per revolution) |
Artefacts used | Ø25 mm (nom) calibration sphere (for the ISO 10360 Part 2 / Part 4 tests) Ø50 mm (nom) ring gauge (for the ring gauge scan tests) |
Scanning speed | 5 mm/s (for the ISO 10360 Part 4 and ring gauge scan tests) |
Touch speed | 5 mm/s (for the ISO 10360 Part 2 tests) |
Back off speed | 1 mm/s (for the ISO 10360 Part 2 tests) |
Bi-directional scans | The effect of probe misalignment and contact friction will result in radius changes with scanning direction if a suitable calibration procedure is not used. Mechanical hysteresis within a probe mechanism is best demonstrated by a bi-directional scan. Therefore, Renishaw have decided to take the high integrity approach of quoting ring gauge metrology using bi-directional scan data to demonstrate the performance of the Renishaw probe and calibration method. |
SS - stainless steel, CER - ceramic
Bi-directional ring gauge scan test
Scanning module (PH10 axis position) | Effective stylus reach | Actual disc stylus used: Diameter / material | RMS data raw | RMS data filtered | SPAN data raw | SPAN data filtered | Stylus tip deflection | Data pts |
|---|---|---|---|---|---|---|---|---|
SM25-3 (A0) | 100 mm | Ø30 mm / CER | 0.52 µm | 0.5 µm | 2.9 µm | 2.4 µm | 0.2 mm | 1244 |
SM25-3 (A0) | 120 mm* | Ø35 mm / SS | 0.5 µm | 0.3 µm | 3.7 µm | 2.3 µm | 0.2 mm | 885 |
SM25-3 (A0) | 120 mm* | Ø35 mm / SS | 0.4 µm | 0.3 µm | 2.6 µm | 1.8 µm | 0.2 mm | 896 |
SM25-3 (A0) | 150 mm** | Ø30 mm / CER | 0.53 µm | 0.48 µm | 3.6 µm | 2.5 µm | 0.2 mm | 1244 |
SM25-4 (A0) | 200 mm | Ø30 mm / CER | 0.77 µm | 0.72 µm | 4.5 µm | 3.5 µm | 0.2 mm | 1244 |
SM25-4 (A0) | 250 mm** | Ø30 mm / CER | 0.77 µm | 0.68 µm | 4.2 µm | 3.1 µm | 0.2 mm | 1243 |
* including the 20 mm extensions
** including the 50 mm extension
Renishaw has developed a lightweight 30 mm diameter disc stylus (A-5003-7098) that will enable two-dimensional scanning with SM25-1 / 2 scanning modules. Alternatively a 12 mm diameter disc stylus (A-5000-3615) is available that can be used with SM25-1 / 2.