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Operational forces on the pin were found for a lower bound on the pin diameters. The operational force was found by using 600N 1200N transferred to the pinion from the steering system (see FEA of rack extension), the torque transferred to the steering column would be 7500 15000 N*mm with a pinion radius of 12.5mm. The inner diameter of the steering column is 19.05mm, therefore the operational force on the pin would be 787 1575 N.

The minimum diameter for the pin to operate in each material using a safety factor of 2, and F=787N1575N:

Material

τallow (MPa)

Diameter (mm)

Nylon

70

35.7835

Aluminum (6061-T6)

207

23.2011

Steel (ASTM - A36)

400

12.5824

Previous on MSXII, the shear pin used was (believed) to be 4-5mm nylon pin, therefore, it would be suitable for MSXIV to also use a nylon pin, from calculations above, the nylon pin should be between 4 5.35 to 6mm in diameter. A diameter of 5.5 mm was chosen and the pin will be machined out of 1/4” OTS nylon rod.