| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MATERIAL PREPARATION & MACHINING | |||
| A1 | Moisture content of machined timber (after final preparation) Acceptance: Moisture 10-15% for interior works; ≤18% for exterior; measured before joinery | Ensure timber seasoning before installation | OK NC NA HOLD |
| A2 | Planing and squaring accuracy (deviation in width/thickness) Acceptance: Deviation ±1 mm on thickness; ±2 mm on width; measured with calipers | Verify dimensional accuracy after machining | OK NC NA HOLD |
| A3 | Surface finish quality (smoothness, grain raised, splinters) Acceptance: Planed surfaces smooth, no raised grain, no splinters >1 mm; finish acceptable | Ensure quality preparation | OK NC NA HOLD |
| A4 | Edge cutting and cleanup (no fuzzy edges, clean cuts) Acceptance: Edges smooth, no tear-out >2 mm, chamfered where required | Professional finish on all edges | OK NC NA HOLD |
| B. JOINERY FABRICATION QUALITY | |||
| B1 | Mortise and tenon joints (fit, gap tolerance, shoulder line) Acceptance: Tenon fits snugly in mortise (≤0.5 mm gap), shoulders flush, no wobble | Critical structural joints | OK NC NA HOLD |
| B2 | Dowel joinery (hole alignment, fit, glue application) Acceptance: Holes aligned perpendicular ±2°, dowel press-fit, even glue coverage | Verify dowel joint quality | OK NC NA HOLD |
| B3 | Bridle and lap joints (shoulder lines, gap, miter accuracy) Acceptance: Shoulders tight fit, gaps ≤0.5 mm, miters at 45° ±1° | Assembly joint integrity | OK NC NA HOLD |
| B4 | Groove and rabbet cuts (depth consistency, straightness) Acceptance: Depth uniform ±1 mm, sides straight, no chatter marks | Accuracy in slot machining | OK NC NA HOLD |
| C. FRAME ASSEMBLY & SQUARENESS | |||
| C1 | Frame squareness check (diagonal measurements) Acceptance: Diagonal difference ≤3 mm for standard frame (e.g., 1000 mm frame) | Ensure rectangular assembly | OK NC NA HOLD |
| C2 | Flatness of frame (no twist or warping in assembly) Acceptance: Flatness ±2 mm over frame diagonal; checked with straightedge | Verify planar assembly | OK NC NA HOLD |
| C3 | Joint tightness (no gaps at corners, uniform glue squeeze-out) Acceptance: Joints tight (no light gaps), glue line uniform, no voids visible | Quality glued assembly | OK NC NA HOLD |
| C4 | Clamp marks and surface preparation after assembly Acceptance: Clamp marks minimal, excess glue cleaned, surface ready for finishing | Post-assembly cleanup | OK NC NA HOLD |