Mass Properties of SSG-Like Scan Mirror

cv[DESCRIBE_SCAN_MIRROR]

Mass Properties of SSG-like Scan Mirror. Drawing SIC-SCAN-SSG-00.dwg.

Command: _massprop

Select objects: 1 found User Coordinate System (UCS) centered on optical surface of Scan Mirror.

• X-axis aligned with major ellipse axis of mirror
• Z-axis aligned with minor ellipse axis of mirror
• Y-axis aligned with mirror thickness (positive toward back of mirror)
• The coordinate system is right-handed

Dimensions are in millimeters. Volume is in cubic millimeters.

AutoCAD Density is 1 (1 gram per cubic millimeter).

For HP SiC the density is 3.35 gm.cm*-3 or 0.00335 gm.mm*-3.

---------------- SOLIDS ----------------

Mass: 714189.4528 mm*3 × 0.00335 gm.mm*-3 = 2392.534667 grams or 2.39 kilograms

Volume: 714189.4528

Bounding box:

• X: -254.0000 -- 254.0000 (Major diameter of ellipse)
• Y: 0.0000 -- 36.8306 (Visual thickness dimension)
• Z: -152.4010 -- 152.4010 (Minor diameter of ellipse)

Centroid:

• X: +0.0002
• Y: 11.7381
• Z: +0.0000

Moments of inertia:

• X: +5 304 923 949.4703 = mass × radius of gyration*2
• Y: 12 053 014 810.4797
• Z: +7 119 191 941.7635

Products of inertia:

• XY: 3180.0183
• YZ: -35.9747
• ZX: 1857027.7410

Radii of gyration:

• X: 86.1852 millimeters
• Y: 129.9096
• Z: 99.8409

Principal moments and X-Y-Z directions about centroid:

• I: 5 206 518 197.8082 along [ 1.0000 0.0000 0.0010]
• J:12 053 014 810.4417 along [ 0.0000 1.0000 0.0000]
• K: 7 020 789 991.6500 along [-0.0010 0.0000 1.0000]