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Shared

Half-overlay and inset boxes are distinct from full overlay in that intermediate panels are shared and panel thickness (instead of panel reveal) determines box height (and width). With half-overlay and inset cabinets, panel reveal is fixed at either panel thickness plus face reveal (inset) or half the panel thickness plus face reveal (half-overlay). With 19mm (3/4") material, all system row start holes are 9.5mm.

Shared Panel Height (SAC)

Shared Panel HeightLike full overlay panels, all shared panel drawer and door edges are an equal distance from a system hole. Unlike full-overlay boxes, shared panel box reveals are always balanced and panel thickness determines the box-to-face reveal. With half-overly and railed-inset panels, system holes can be used as construction holes (SAC). All horizontal panels can be indexed to system holes.

Half-overlay and railed-inset panel heights are always a multiple of 32mm plus panel thickness (e.g. +19mm constant). Being a balanced panel, half the panel thickness added to the top and bottom of the panel (e.g. 9.5 + 32xn + 9.5, AKA 9.5/9.5 starts). Shared panel box top and bottom reveals are always the same as the box side reveals... This panel design appears to have been first used by Hettich's System 32 over 40 years ago.

Half-overlay box reveals are always half the panel thickness plus the half the gap between door/drawer faces, e.g. 11mm for 19mm panels (19/2 + 3/2). Inset box reveals are always the panel thickness plus the gap, e.g. 22mm for 19mm panels (19 + 3).

Half-overlay (and no-rail-inset) faces are the same heights as full overlay faces (32xn - reveal). Railed-inset faces are always some increment of 32mm minus panel thickness and 2x gap (e.g. 32xn - 19 - 6).

Only the half-overlay and railed-inset panel designs can use system holes as construction holes (SAC). With SAC panels, all faces edges center on system holes. They have good top/bottom clearance for drawers and I have never found a need to center face edges between system holes (useful with the lesser clearances in full-overlay boxes).
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