Drive Wheel -- Performance

The drive wheel requires high strength, toughness, and wear resistance.

There are many factors that impact the design of the wheel.  As a baseline, the nominal mechanical requirements for the wheel are:

-- Ultimate Tensile Strength > 130 KSI

-- Yield Strength > 100 KSI

-- Elongation/Strain in 2" gage > 5%

-- Fracture Toughness  >50 Ft. Lbs by Charpy Impact

-- Hardness  > 300 Brinell Hardness

Critical dimensional features in the wheel are --

-- Machined tolerances = ± 15 mils for center bore,
   keyway, and rim OD

-- Overall as-cast tolerance = ± 30 mils

-- Surface finish requirement is 350 RMS with no visible 
   surface defects or grinding marks

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