Post Deflection Calculator
Calculate lateral deflection, angular tilt, and beam walk-off for an optical post supporting a cantilevered load.
Post & Load
Lateral Deflection
Deflection (δ)
5.036µmδ = ML² / (2EI)
Bending moment
110.3mN·mSecond moment of area (I)
1277.0mm⁴Angular Tilt
Tilt angle (θ)
33.57µradθ = δ / L
6.925arcsec
Beam Walk-off (Double-Pass Reflection)
Angular deviation
67.15µrad2θ for reflected beam
Spot shift at 500.0 mm
33.57µmStructural
Bending stress at base
0.5486MPaσ = Mr / I
Approx. natural frequency
139.2HzCantilever with end mass
Post self-mass
152.0gAssessment
Moderate deflection — may affect precision alignment. Moderate natural frequency (139.2 Hz).
Abridged Optics — Post Deflection Calculator v1.0Assumes ideal cantilever with rigid base. Real deflection may differ due to post holder compliance.