Quality
Assurance |
NASA
placed very stringent requirements for quality assurance on the track shoe.
These QA directives covered both process control and documentation
and evaluation and testing of the castings. |
The initial
Phase 1 prototype established the processes for mold and core fabrication,
melting and pouring, heat treatment, finishing, and machining of the
castings. |
Surface Flatness Inspection
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Magnetic Particle Inspection
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Testing
and inspection included --
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The
testing of 21 hardness points on each casting.
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Verification
of surface finish on external and internal surfaces and magnetic
particle inspection of each casting.
-
Verification
on each casting for conformance to height and road surface flatness
requirements.
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Dimensional
verification on each
machined feature of pin lug
pitch and location.
-
One
of every ten of shoes were randomly selected for ultrasonic and
radiographic examination.
-
One
of every thirty-two shoes was subjected to a complete dimensional
verification.
-
One
of every fifty-seven shoes was destructively tested to verify internal
dimensions, soundness, uniformity of microstructure, through hardness,
and mechanical strength.
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