switch u-channel diagram from svg to cetz

3 files changed, 193 insertions, 1384 deletions

diff --git a/mechanical-specifications.typ b/mechanical-specifications.typ
index 465702e..11fe05c 100644
--- a/mechanical-specifications.typ
+++ b/mechanical-specifications.typ
@@ -744,9 +744,199 @@ interlocking U-shaped steel channel:
 ===== U-channel (cover) <u-channel-cover>
 
 #figure(
-  image("pictures/u-channel.svg"),
-  caption: [U-channel (cover) construction],
-) <figure-u-channel-construction>
+  cetz.canvas({
+    import cetz.draw: *
+
+    // Scale factor: 1 mm = 0.060 drawing units
+    let s = 0.060
+
+    let h = 165.1 * s // 4.953 mm
+    let d = 152.4 * s // 4.572 mm
+    let w = 35.7 * s // 1.071 mm
+    let f = 8.0 * s // 0.240 mm (8 mm flange overlap)
+    let t = 1.2 * s // Sheet metal thickness (1.2 mm)
+
+    let y-bot = 0
+    let y-top = h
+
+    // ==========================================
+    // 1. FRONT ELEVATION (U-Profile End View: 35.7 x 165.1 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])
+
+    // U-Channel Sheet Metal Cross-Section Outline
+    // Top Limb
+    rect(
+      (x-front-start, y-top - t),
+      (x-front-end, y-top),
+      fill: luma(210),
+      stroke: 0.8pt + black,
+    )
+    // Right Side Wall
+    rect(
+      (x-front-end - t, y-bot),
+      (x-front-end, y-top),
+      fill: luma(230),
+      stroke: 0.8pt + black,
+    )
+    // Bottom Limb
+    rect(
+      (x-front-start, y-bot),
+      (x-front-end, y-bot + t),
+      fill: luma(210),
+      stroke: 0.8pt + black,
+    )
+
+    // Inner Cavity Hatch/Indicator Line
+    line(
+      (x-front-start, y-bot + t),
+      (x-front-end - t, y-bot + t),
+      (x-front-end - t, y-top - t),
+      (x-front-start, y-top - t),
+      stroke: (paint: luma(140), thickness: 0.5pt, dash: "dotted"),
+    )
+
+    // Front Width Dimension (35.7 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 - 0.6),
+      (x-front-end, y-bot - 0.6),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content((x-front-mid, y-bot - 0.9), text(size: 7pt)[$qty(35.7, "mm")$])
+
+    // Front Height Dimension (165.1 mm)
+    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 - 0.6, y-bot),
+      (x-front-start - 0.6, y-top),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content(
+      (x-front-start - 0.9, (y-bot + y-top) / 2),
+      text(size: 7pt)[$qty(165.1, "mm")$],
+      angle: 90deg,
+    )
+
+    // ==========================================
+    // 2. RIGHT ELEVATION (Inner Face View: 152.4 x 165.1 mm)
+    // ==========================================
+    let x-right-start = 3.5
+    let x-right-end = x-right-start + d
+    let x-right-mid = (x-right-start + x-right-end) / 2
+
+    // View Title
+    content((x-right-mid, y-top + 0.8), text(
+      size: 8.5pt,
+      weight: "bold",
+    )[RIGHT ELEVATION (INNER FACE)])
+
+    // Main Right Wall Sheet Metal Surface
+    rect(
+      (x-right-start, y-bot),
+      (x-right-end, y-top),
+      fill: luma(245),
+      stroke: 1.2pt + black,
+    )
+
+    // Masked Unpainted Perimeter Area (8mm border where it mates with L-channel flanges)
+    rect(
+      (x-right-start + f, y-bot + f),
+      (x-right-end - f, y-top - f),
+      fill: luma(230),
+      stroke: (paint: luma(130), thickness: 0.7pt, dash: "dashed"),
+    )
+    content(
+      (x-right-mid, (y-bot + y-top) / 2),
+      text(size: 7.5pt, fill: luma(100))[Painted Central Surface],
+    )
+
+    // Countersunk Through-Holes (Crosshair + concentric circles for 90-deg countersink)
+    let draw-csink(cx, cy) = {
+      circle((cx, cy), radius: 0.10, fill: white, stroke: 0.6pt + black)
+      circle((cx, cy), radius: 0.05, fill: luma(180), stroke: 0.4pt + black)
+      line((cx - 0.13, cy), (cx + 0.13, cy), stroke: 0.3pt + luma(120))
+      line((cx, cy - 0.13), (cx, cy + 0.13), stroke: 0.3pt + luma(120))
+    }
+
+    // Top & Bottom Edge Countersunk Hole Pattern (matching top/bottom flanges)
+    draw-csink(x-right-start + 30.0 * s, y-top - f / 2)
+    draw-csink(x-right-start + 122.4 * s, y-top - f / 2)
+    draw-csink(x-right-start + 30.0 * s, y-bot + f / 2)
+    draw-csink(x-right-start + 122.4 * s, y-bot + f / 2)
+
+    // Front & Rear Edge Countersunk Hole Pattern
+    draw-csink(x-right-start + f / 2, y-bot + 30.0 * s)
+    draw-csink(x-right-start + f / 2, y-top - 30.0 * s)
+    draw-csink(x-right-end - f / 2, y-bot + 30.0 * s)
+    draw-csink(x-right-end - f / 2, y-top - 30.0 * s)
+
+    // Depth Dimension (152.4 mm)
+    line(
+      (x-right-start, y-bot),
+      (x-right-start, y-bot - 0.6),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-right-end, y-bot),
+      (x-right-end, y-bot - 0.6),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-right-start, y-bot - 0.6),
+      (x-right-end, y-bot - 0.6),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content((x-right-mid, y-bot - 0.9), text(size: 7pt)[$qty(152.4, "mm")$])
+
+    // Masked Border Callout Annotation
+    line(
+      (x-right-start + f / 2, y-top - 15.0 * s),
+      (x-right-start - 0.5, y-top - 1.0),
+      stroke: 0.5pt + black,
+    )
+    content(
+      (x-right-start - 0.5, y-top),
+      text(size: 6.5pt)[Masked unpainted perimeter \
+        (8 mm EMI contact area)],
+      anchor: "south-east",
+      angle: 90deg,
+    )
+  }),
+  caption: [Cassette U-Channel cover technical drawings showing Front Elevation (profile) and Right Elevation (inner face showing masked unpainted EMI perimeter and countersunk hole grid).],
+) <figure-cassette-uchannel-diagram>
 
 / Role: EMI Shielding and Protection.
 / Geometry:
diff --git a/pictures/l-channel.svg b/pictures/l-channel.svg
deleted file mode 100644
index ae0d548..0000000
--- a/pictures/l-channel.svg
+++ /dev/null
@@ -1,980 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   viewBox="0 0 1048.8657 368.15234"
-   width="1048.8657"
-   height="368.15234"
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-   version="1.1"
-   id="svg61"
-   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
-   sodipodi:docname="l-channel.svg"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:cc="http://creativecommons.org/ns#">
-  <sodipodi:namedview
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-     pagecolor="#ffffff"
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-     inkscape:showpageshadow="2"
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-     inkscape:zoom="1.3223809"
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-     inkscape:window-width="1920"
-     inkscape:window-height="1011"
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-  <defs
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-    </marker>
-    <!-- Standard CAD Arrowheads -->
-    <!-- Diagonal Hatch Pattern for Unpainted/Masked Contact Surfaces -->
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-       width="6"
-       height="6"
-       patternTransform="rotate(45 0 0)"
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-    </pattern>
-  </defs>
-  <!-- ================================================================= -->
-  <!-- TITLE & HEADER                                                    -->
-  <!-- ================================================================= -->
-  <!-- ================================================================= -->
-  <!-- VIEW 1: ISOMETRIC VIEW (LEFT SIDE)                                -->
-  <!-- ================================================================= -->
-  <!-- ================================================================= -->
-  <!-- VIEW 2: REAR ELEVATION (TOP RIGHT)                                -->
-  <!-- ================================================================= -->
-  <!-- ================================================================= -->
-  <!-- VIEW 3: LEFT WALL ELEVATION (BOTTOM RIGHT)                        -->
-  <!-- ================================================================= -->
-  <!-- ================================================================= -->
-  <!-- TECHNICAL NOTES SUMMARY BOX                                       -->
-  <!-- ================================================================= -->
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-    <text
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-       y="98"
-       text-anchor="middle"
-       fill="#666666"
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-       id="text5"
-       style="fill:#000000;fill-opacity:1">(Showing Inward 90° Flanges &amp; Masked Faces)</text>
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