At the heart of the ASME B106.1M PDF is the definitive formula used to calculate the minimum required shaft diameter. The standard utilizes a modified version of the or the Distortion Energy (von Mises) Theory , tailored specifically for cyclic fatigue.
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The stiffness of the shaft must be considered, particularly for bearing and seal performance.
): Accounts for shoulders, keyways, and fillets on the shaft. Accounts for surface finish (polished, machined, etc.). asme b1061m pdf exclusive
For a solid, circular rotating shaft under combined steady torque ( ) and cyclic bending moment ( ), the minimum required diameter ( ) is determined using an elliptical limit curve:
Furthermore, engineers often verbally shorten "B106.1M" to "B106M" in casual conversation. There is also an "ANSI B106.1M-1985 (Second Printing)" which was released in March 1986, incorporating minor editorial changes, definitions, and a revised table.
The (Design of Transmission Shafting) is a critical technical standard used by engineers to calculate the diameter of solid or hollow rotating steel shafts. While the standard was officially withdrawn in 1994, its methodology remains a foundational reference for fatigue analysis in modern mechanical design. Core Purpose and Scope
: The code requires adjustments for real-world conditions that reduce a material's fatigue strength, such as: Surface Condition : Impacts of machining or finishing. Size & Reliability At the heart of the ASME B106
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The standard provides formulas for both SI units and imperial units, with "M" in B106.1M indicating its SI-inclusive, modern approach. 2. Why Access the ASME B106.1M PDF?
The standard formerly known as ASME B106.1M (or ANSI/ASME B106.1M-1985), titled "Design of Transmission Shafting," is a historical engineering document that provides methods for calculating the diameter of rotating steel shafts. Status and Availability Withdrawn Status : This standard was officially withdrawn by ANSI in 1994
: How the finish (polished vs. rough) affects fatigue life. Quick download to get started on calculations immediately
: Unlike earlier codes (e.g., ASA-B17C-1927) that relied on static yield strength, B106.1M focuses on fatigue failure caused by fluctuating loads and crack propagation.
: Modify the material limits based on surface roughness, shaft size, and geometric stress concentrators (like keyways).
[Transverse Force / Bending Load] │ ▼ ┌─────────────────────────────────────────────────────┐ ───┤ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ │─── │ (Steady Torsion) ──► ◄── (Reversed Bending) │ ───┤ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ █ │─── └─────────────────────────────────────────────────────┘ ▲ │ [Bearing Support] Core Governing Formulas