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// SAME Analog Modular Ecosystem
//
// / SPDX-FileCopyrightText: 2026 Denis Chevalier <perso@denischevalier.fr>
// / SPDX-License-Identifier: CC-BY-SA-4.0
// / SPDX-License-Identifier: CERN-OHL-S-2.0+
// / SPDX-License-Identifier: GPL-3.0-or-later
//
// The prose, explanatory text, rendered figures, tables, and mathematical
// content of this specification are licensed under CC BY-SA 4.0. If a later
// version of CC BY-SA is published, the author grants permission to distribute
// this work under that later version as well.
//
// Hardware designs contained herein (schematics, PCB layouts, mechanical
// drawings, and CAD models) are licensed under CERN-OHL-S-2.0+.
//
// All executable code, helper libraries (`lib/*`), metrology assertions, and
// embedded verification scripts throughout the source documents are licensed
// under the GNU General Public License v3.0 or later (GPL-3.0-or-later).
#import "../lib/unify.typ": qty
#import "@preview/cetz:0.5.2"
#figure(
cetz.canvas({
import cetz.draw: *
// Scale factor: 1 mm = 0.050 drawing units
let s = 0.050
let h-total = 177.8 * s // 8.890 mm
let h-body = 165.1 * s // 8.255 mm
let h-lip = 6.35 * s // 0.3175 mm (6.35 mm top/bottom lips)
let w = 38.0 * s // 1.900 mm (panel width)
let f = 8.0 * s // 0.400 mm (8 mm L-channel flange overlap)
let y-bot = 0
let y-lip-bot = h-lip
let y-lip-top = h-total - h-lip
let y-top = h-total
// Helper: Draw M3 clearance hole (3.2 mm diameter)
let draw-m3-hole(cx, cy) = {
circle((cx, cy), radius: 1.6 * s, fill: white, stroke: 0.8pt + black)
line((cx - 2.5 * s, cy), (cx + 2.5 * s, cy), stroke: 0.3pt + luma(120))
line((cx, cy - 2.5 * s), (cx, cy + 2.5 * s), stroke: 0.3pt + luma(120))
}
// Helper: Draw M3 countersunk hole (concentric circles + crosshair)
let draw-csink(cx, cy) = {
circle((cx, cy), radius: 3.0 * s, fill: white, stroke: 0.8pt + black)
circle((cx, cy), radius: 1.6 * s, fill: luma(200), stroke: 0.5pt + black)
line((cx - 4.0 * s, cy), (cx + 4.0 * s, cy), stroke: 0.3pt + luma(120))
line((cx, cy - 4.0 * s), (cx, cy + 4.0 * s), stroke: 0.3pt + luma(120))
}
// ==========================================
// 1. FRONT ELEVATION (38.0 x 177.8 mm)
// ==========================================
let x-front-start = 0
let x-front-end = x-front-start + w
let x-front-mid = (x-front-start + x-front-end) / 2
// View Title
content((x-front-mid, y-top + 0.8), text(
size: 8.5pt,
weight: "bold",
)[FRONT ELEVATION])
// Main Panel Outer Boundary
rect(
(x-front-start, y-bot),
(x-front-end, y-top),
fill: luma(245),
stroke: 1.2pt + black,
)
// Lip Limit Boundary Indicators (Dashed horizontal lines at 6.35 mm from top/bottom)
line(
(x-front-start, y-lip-bot),
(x-front-end, y-lip-bot),
stroke: (paint: luma(110), thickness: 0.7pt, dash: "dashed"),
)
line(
(x-front-start, y-lip-top),
(x-front-end, y-lip-top),
stroke: (paint: luma(110), thickness: 0.7pt, dash: "dashed"),
)
// Centered M3 Panel Mounting Holes in Top and Bottom Lips
draw-m3-hole(x-front-mid, h-lip / 2)
draw-m3-hole(x-front-mid, h-total - h-lip / 2)
// L-Channel Attachment Countersunk Holes (X = 4.0 mm, Y = 30.0 mm and 135.0 mm from body start)
let y-hole-lower = y-lip-bot + 30.0 * s
let y-hole-upper = y-lip-bot + 135.0 * s
let x-hole-lchannel = x-front-start + 4.0 * s
draw-csink(x-hole-lchannel, y-hole-lower)
draw-csink(x-hole-lchannel, y-hole-upper)
// Dimension: Panel Width (38.0 mm)
line(
(x-front-start, y-bot),
(x-front-start, y-bot - 0.6),
stroke: 0.4pt + luma(140),
)
line(
(x-front-end, y-bot),
(x-front-end, y-bot - 0.6),
stroke: 0.4pt + luma(140),
)
line(
(x-front-start, y-bot - 0.55),
(x-front-end, y-bot - 0.55),
mark: (start: "stealth", end: "stealth"),
mark-size: 0.10,
stroke: 0.6pt + black,
)
content((x-front-mid, y-bot - 0.85), text(size: 7pt)[$qty(38.0, "mm")$])
// Dimension: Total Height (177.8 mm / 4U)
line(
(x-front-start, y-bot),
(x-front-start - 0.6, y-bot),
stroke: 0.4pt + luma(140),
)
line(
(x-front-start, y-top),
(x-front-start - 0.6, y-top),
stroke: 0.4pt + luma(140),
)
line(
(x-front-start - 0.55, y-bot),
(x-front-start - 0.55, y-top),
mark: (start: "stealth", end: "stealth"),
mark-size: 0.10,
stroke: 0.6pt + black,
)
content(
(x-front-start - 0.85, (y-bot + y-top) / 2),
text(size: 7pt)[$qty(177.8, "mm")$ ($qty(4, "U")$)],
angle: 90deg,
)
// Dimension: Lip Height (6.35 mm)
line(
(x-front-end, y-top),
(x-front-end + 0.6, y-top),
stroke: 0.4pt + luma(140),
)
line(
(x-front-end, y-lip-top),
(x-front-end + 0.6, y-lip-top),
stroke: 0.4pt + luma(140),
)
line(
(x-front-end + 0.55, y-lip-top),
(x-front-end + 0.55, y-top),
mark: (start: "stealth", end: "stealth"),
mark-size: 0.08,
stroke: 0.6pt + black,
)
content(
(x-front-end + 1.2, (y-lip-top + y-top) / 2),
text(size: 6.5pt)[$qty(6.35, "mm")$],
)
// Dimension: Body Height (165.1 mm)
line(
(x-front-end, y-lip-bot),
(x-front-end + 0.6, y-lip-bot),
stroke: 0.4pt + luma(140),
)
line(
(x-front-end + 0.55, y-lip-bot),
(x-front-end + 0.55, y-lip-top),
mark: (start: "stealth", end: "stealth"),
mark-size: 0.10,
stroke: 0.6pt + black,
)
content(
(x-front-end + 0.85, (y-lip-bot + y-lip-top) / 2),
text(size: 7pt)[$qty(165.1, "mm")$],
angle: -90deg,
)
// ==========================================
// 2. REAR ELEVATION (INNER FACE: 38.0 x 177.8 mm)
// ==========================================
let x-rear-start = 4.5
let x-rear-end = x-rear-start + w
let x-rear-mid = (x-rear-start + x-rear-end) / 2
// View Title
content((x-rear-mid, y-top + 0.8), text(
size: 8.5pt,
weight: "bold",
)[REAR ELEVATION (INNER FACE)])
// Painted Central Surface Area
rect(
(x-rear-start, y-bot),
(x-rear-end, y-top),
fill: luma(225),
stroke: 1.2pt + black,
)
// Masked Unpainted Area 1: Top Lip (6.35 mm full width)
rect(
(x-rear-start, y-lip-top),
(x-rear-end, y-top),
fill: luma(250),
stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
)
// Masked Unpainted Area 2: Bottom Lip (6.35 mm full width)
rect(
(x-rear-start, y-bot),
(x-rear-end, y-lip-bot),
fill: luma(250),
stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
)
// Masked Unpainted Area 3: L-Channel Front Flange Contact Strip (8 mm along right side in rear view)
rect(
(x-rear-end - f, y-lip-bot),
(x-rear-end, y-lip-top),
fill: luma(250),
stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
)
// Center Painted Label
content(
(x-rear-start + (w - f) / 2, (y-lip-bot + y-lip-top) / 2),
text(size: 7.5pt, fill: luma(100))[Painted Surface],
)
// M3 Lip Holes in Rear View
draw-m3-hole(x-rear-mid, h-lip / 2)
draw-m3-hole(x-rear-mid, h-total - h-lip / 2)
// L-Channel Attachment Holes in Rear View (X = 38.0 - 4.0 = 34.0 mm in rear view)
let x-hole-rear = x-rear-end - 4.0 * s
draw-m3-hole(x-hole-rear, y-hole-lower)
draw-m3-hole(x-hole-rear, y-hole-upper)
// Masked Contact Area Callout Annotations
line(
(x-rear-mid, y-top - h-lip / 2),
(x-rear-end + 0.5, y-top + 0.3),
stroke: 0.5pt + black,
)
content(
(x-rear-end + 0.55, y-top + 0.3),
text(size: 6.5pt)[Masked unpainted lip (chassis grounding)],
anchor: "south-west",
)
line(
(x-rear-end - f / 2, y-hole-upper + 10.0 * s),
(x-rear-end + 0.5, y-hole-upper + 10.0 * s),
stroke: 0.5pt + black,
)
content(
(x-rear-end + 0.55, y-hole-upper + 10.0 * s),
text(size: 6.5pt)[Masked 8 mm flange contact strip],
anchor: "west",
)
}),
caption: [Cassette Front Panel technical drawings showing Front Elevation (with countersunk L-channel attachment holes and lip mounting holes) and Rear Elevation (inner face detailing masked unpainted EMI contact areas)],
) <figure-cassette-front-panel-diagram>
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