1. Metrology of the Stave250 Assembly Jig (Tim)

2. What do we need to measure?

3. Procedure Measure PH2 and define as (0,0) – 4 point: DIA=0.043 / CIRC=0.001 Measure PH1 and define PH2-PH1 as primary axis – 4 point: DIA = 0.063 / CIRC=0.001 – Distance PH1-PH2 = 1247.520 Measure front edge of 14 Vee-blocks at 4 points along length (See plot) and reconstruct line of best fit – Y=-42.228 + 1.5738x10 -4 X Measure Tooling ball – (1248.586,-119.685): DIA=8.207 / CIRC=0.011

4. Vee Blocks

5. CAD Analysis

7. Comparison with SmartScope Procedure – Mount jig on Smartscope & reconstruct lines along the edges of the Vee blocks (sub-stage illumination). Construct datum axis – Measure tooling ball as a composite of 3 sub-circles Diameter = 8.209 / CIRC = 0.0186 – Measure PH1 as a composite of 3 sub-circles Diameter = 0.0287 / CIRC = 0.0015 – Measure distance from Tooling ball to PH1 parallel to Vee-block datum axis 1.0765 – Diameter/2 = -3.028 – Measure PH1 offset to Vee-block axis 42.040

8. Vee-blocks (CMM vs SmartScope)

9. CMM Survey with Back-lighting Pin-holes and tooling ball measured with back-lighting to try and improve measurement – Hi-tec torch (Wifi/3G enabled) Results – Pin-holes 0.028 / 0.030 mm with 4-point circularity of 0.001mm – Tooling ball 8.205mm with 20-point circularity of 0.025mm

10. Comparison of CMM Vee-block alignments

11. Survey with 4mm dowels (CMM#3) 4mm dowels held into Vee blocks with tool-makers clamps. Inner edge of dowels reconstructed using back illumination via reflection from aluminium.

12. Comparison of Vee-block surveys NB 4mm dowel data offset by +3.40 mm

13. Summary ParameterCMMCMM #2CMM#3SmartScope Ref Offset Y142.03242.03645.47242.040 Ref Offset Y242.22842.22945.649 Dim Y1 to Y21247.5201247.522 Ref Offset X13.0533.0573.0553.028