Turn the load case into
a practical shaft diameter.

Define the load case

Use the most severe transverse loading condition

Transverse-load model

Gravity + inertiaF = m(g + a)Conservative when gravity and acceleration act in the same transverse direction.Inertia onlyF = maUse when gravity does not bend the shaft in the checked direction.Direct loadF = entered loadEnter a known total transverse load before distribution and safety factor.

Total moving mass

Transverse acceleration

m/s²

Effective span between supports

Safety factor

Support arrangement

Simply supportedCommonFixed at both endsHigh stiffnessCantilever, end loadMost severe

Shaft material

Allowable deflection

Load carried by this shaft

100% keeps the conservative single-shaft assumption; use 50% only when two shafts share the load equally.

Assumptions and calculation limits ＋

Solid round shaft with a concentrated mid-span load; the cantilever case uses an end load. The selected load share is applied before the safety factor. Shaft self-weight, impact, stress concentration, bearing clearance, load-distribution error, and critical speed are excluded.

Preliminary result

Strength and stiffness checks

Recommended standard shaft diameter

^Ø50mm

Governed by stiffness · select a standard solid shaft

Maximum deflectionLimit 0.20 mm0.105 mm

Bending stressAllowable 180 MPa10.1 MPa

Design load on this shaft: 620 N
Total load before distribution: 413 N
Maximum bending moment: 124.0 N·m
Support model: Simply supported
Elastic modulus: 206 GPa

Recommended next checks

Verify load sharing, bearing type, fits, surface hardness, and installation error. For high-speed reciprocating motion, also check critical speed and fatigue life.

Turn the load case intoa practical shaft diameter.

Define the load case

Preliminary result

Turn the load case into
a practical shaft diameter.