Hinge Plate Base Height Verification
This procedure defines the method for measuring and verifying the base height of hinge plates to within engineering tolerances. Ensures consistent stack-up in assemblies and reduces rework due to dimensional variation.
To establish a repeatable process for measuring the base height of hinge plates using a height gauge and granite surface plate. Accurate base height is critical for hinge alignment, fastener fit, and overall assembly quality. This SOP supports lean manufacturing goals by reducing variation and enabling first-pass yield improvement.
This SOP applies to all hinge plates received from external suppliers or produced in‑house that require base height verification per engineering drawing (reference: HPL-001 Rev C). It covers the inspection station in the quality room and is performed by certified quality technicians or trained production operators designated by the quality manager.
- Lockout/tagout is not required for this manual measurement task. However, ensure the inspection area is clear of moving machinery hazards.
- Wear safety glasses to protect against potential debris. Use cut‑resistant gloves if handling sharp‑edged hinge plates.
- Use proper lifting technique when moving heavy or bulky hinge plates ( > 10 kg). Use a hoist or cart if available.
- If using solvent for cleaning, follow SDS guidelines and ensure adequate ventilation.
- Digital vernier caliper (0.01 mm resolution) – for auxiliary checks
- Granite surface plate (Grade AA or better)
- Height gauge with dial indicator (0.001 in / 0.02 mm graduation)
- Lint‑free cleaning cloth
- Isopropyl alcohol or mild solvent
- Approved inspection marker (e.g., Sharpie or Dykem)
- Inspection log sheet or digital data collection system
- Engineering drawing HPL-001 Rev C (or current revision)