Standard Work · SOP

Drawer Front Reveal Consistency Audit 3Mm Standard

A systematic quality control procedure to verify that all drawer front reveals comply with the 3mm nominal gap standard. This audit ensures visual uniformity, prevents assembly rework, and supports lean manufacturing cell flow.

Estimated Time

15 min

Difficulty

Intermediate

Regulation

Lean 5S · ISO 9001

Version

1.0

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Purpose

This procedure defines the method for inspecting and recording the reveals (gaps) between drawer fronts and their surrounding panels. The target reveal is 3mm ±0.5mm. Consistent reveals are a hallmark of quality cabinetry; deviations cause customer complaints, rework, and wasted material. By auditing every drawer stack at the final assembly stage, the production team can quickly identify adjustments needed in hinge alignment, drawer box placement, or subframe levelness.

Scope

This SOP applies to all drawer front assemblies in the kitchen, bathroom, and vanity product lines. It covers individual drawer fronts as well as stacked drawer banks (e.g., two-drawer base cabinets, three-drawer tall units). The audit is performed after all drawers are hung and leveled but before final door adjustment and packing. Drawer fronts with a different specified reveal (e.g., 4mm for certain modern lines) must use a separate gauge—this document assumes 3mm nominal.

Safety Precautions

LOTOLockout/Tagout: ensure no powered machinery is running within the audit station. Drawer alignment stations must be isolated from automated clamping or feed units.
PPEWear impact-resistant safety glasses. Fine shavings or splinters may be present on drawer box edges. Keep hands clear of moving drawers when auditing stacked units.
MANUALUse proper lifting technique when positioning heavy drawer fronts. For cabinets > 36″ wide, request a second team member assist with drawer front placement.

Required Tools & Materials

Feeler gauge set (1mm–10mm) or calibrated spacer blocks
Digital caliper (resolution 0.01mm)
3mm go/no-go gauge (custom ground or purchased)
Reveal audit checklist pad (pre-printed with drawer positions)
Blue painter’s tape (for marking non-conforming locations)
Spirit level (600mm minimum) – optional for verifying overall cabinet level

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Procedure: Step-by-Step

1 Prepare the workstation: ensure all drawers are installed and closed. Remove any protective film on drawer front edges. Reference the bill of materials for correct drawer front thickness (typically 18mm or 21mm). Place the audit checklist on a clean surface within arm’s reach.

2 Select the first drawer to audit. For side-by-side drawer stacks, start at the top-left moving right, then top-down to bottom. For tower units, audit in a consistent serpentine pattern. Write the cabinet ID and drawer position on the checklist.

3 Check the top reveal: Using the 3mm go/no-go gauge, insert it between the drawer front top edge and the above panel (countertop or valance). The gauge must enter snugly but not force. If the gauge fits with resistance greater than 0.5mm (i.e., you need to push hard or it sticks), mark the drawer front with blue tape and record the measurement as non‑conforming. Use the digital caliper to capture the exact gap.

4 Check left and right vertical reveals: Insert the same 3mm gauge at the top, middle, and bottom of each side. Record all three measurements on the checklist. The reading must be within ±0.5mm of nominal 3mm at every point. Any deviation >0.5mm requires adjustment (hinge shift, drawer box repositioning, or subframe shimming).

5 Check bottom reveal: Insert the gauge evenly across the width of the bottom edge. For single drawer cabinets, the measurement is recorded. For stacked drawer banks, the bottom reveal of the upper drawer and the top reveal of the lower drawer must sum to 6mm ±0.5mm. Measure both and add the values; if the sum exceeds tolerance, both drawer fronts may need adjustment.

6 Record and mark: For each drawer, write the final status (pass / fail – with fail reason) on the audit checklist. Use blue tape to flag any non‑conforming location. On the tape, write the actual gap measurement and the corrective action taken (e.g., “Top reveal 3.8mm – hinge raised”).

7 Repeat for all remaining drawers. Complete the audit form for the entire cabinet. Sign and date the form. If more than 10% of drawer fronts in a single cabinet are non‑conforming, escalate to the quality lead for a process review. After the audit, remove all blue tape before the unit proceeds to packing.

Drawer Front Reveal Consistency Audit 3Mm Standard

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