IS-431: Height Adjustment Testing & Evaluation

Testing & Evaluation

V-Model Traceability: This page validates RM-5 (Provide ≥ 400 mm vertical stroke, full stroke ≤ 32 s) and informs RM-1 (Structural stability — lift/structure load-path separation confirmed) through design verification, concept selection evidence, and physical stroke confirmation.

Design Verification and Test Summary

Requirement / check	Verification method	Result	Status	Notes
RM-3: Provide 400 mm vertical stroke	Concept sizing and packaging review	Achieved	Pass
Separate lifting from lateral load-bearing	Load-path design review	Achieved	Pass	Core structural principle of final concept
Rear linear-guide concept as final solution	Concept evaluation	Not selected	Fail as final solution	Structurally sound but too many precision-fitted parts
Telescopic guided column concept	Concept evaluation	Selected	Pass	Best balance of stiffness, simplicity, and robustness
Commercial off-the-shelf lift columns	Concept evaluation	Not selected	Fail as final solution	Side-load confidence insufficient
Screw-jack-based lifting architecture	Concept evaluation	Selected	Pass	Provides self-holding and good axial integration
Current full-stroke time (~32 s)	Speed estimate and observed performance	Acceptable for current implementation logic	Pass (functional)
Ideal user preference (~10 s full stroke)	Performance target comparison	Not achieved	Partial	Would require different mechanism or actuation strategy
Delrin wear and repeated-cycle behaviour	Long-term physical validation	Not yet fully tested	Partial
Quantitative column stiffness under punch disturbance	Physical testing	Not yet fully tested	Partial

Summary of verification outcome

At present, the height-adjustment subsystem is successful in concept, load-path logic, stroke provision, and structural direction, but not yet fully closed in long-term physical validation.

The most important completed successes are:

the clear separation of lifting and structural functions,
the move from exposed rail-based guidance to a more integrated telescopic column,
the achievement of the 400 mm stroke requirement,
and the preservation of a mechanically coherent load path under operational disturbance.

The most important remaining work is:

repeated-cycle and wear testing of the Delrin-guided column,
quantitative measurement of lateral stiffness and backlash,
and evaluation of whether future revisions can move the full-stroke time closer to the ideal user target without weakening the structural logic of the subsystem.

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