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Silica Carbide Mirror

Lightweight primary mirror

Name Inspection results Inspection result Inspection item Inspection results
1# 2# 1# 2#
428mm ligh tweight reflector Outer diameter of A φ427.9979 φ428.0565 Cylindricity of back hole 0.0119 0.0097
Polished aperture φ425.7579 φ425.9765 Coaxiality between outer circle and reference surface A φ0.0934 φ0.0935
Center thickness 84.0648 84.0981 Coaxiality between center holeand reference surface A φ0.0160 φ0.0228
Total thickness 104.5900 104.6821 Flatness of back 0.0027 0.0042
Edge thickness 27.5253 27.4439 Perpendicularity of back(reference surface A) 0.0117 0.0065
Vector height 20.3642 20.5840 Coaxiality between reflecting surface's optical axis and ф120 surface Guaranteed by machining Guaranteed by machining
Diameter of center hole φ75.2480 φ75.2239 Perpendicularity between reflecting surface's optical axis and reference surface B
Diameter of back hole φ120.0145 φ120.0031 R value 1099.9303 1099.7455
Depth of back hole 68.0482 68.0466 kK value Guaranteed by machining Guaranteed by machining
Diameter of back circle φ170.80 φ171.50 Roughness
Cylindricity of center hole 0.0062 0.0122 Weight 16254.0g 16252.5g

Surface flatness precision value:

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