From 34351baa98ffbdaa85b77c444f740e0abad511ef Mon Sep 17 00:00:00 2001
From: Denis Chevalier <perso@denischevalier.fr>
Date: Sat, 8 Aug 2026 15:07:16 +0200
Subject: Improve global project (typos, enforce 80 columns whenever possible,
 diagrams) and finish 3.1

---
 pictures/u-channel.svg | 401 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 401 insertions(+)
 create mode 100644 pictures/u-channel.svg

(limited to 'pictures/u-channel.svg')

diff --git a/pictures/u-channel.svg b/pictures/u-channel.svg
new file mode 100644
index 0000000..67d0e18
--- /dev/null
+++ b/pictures/u-channel.svg
@@ -0,0 +1,401 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 466.52149 279.6629"
+   width="466.52148"
+   height="279.6629"
+   style="font-family:serif"
+   version="1.1"
+   id="svg60"
+   sodipodi:docname="u-channel.svg"
+   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   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
+     id="namedview60"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="false"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     showborder="false"
+     borderlayer="false"
+     inkscape:zoom="1.2698413"
+     inkscape:cx="-26.38125"
+     inkscape:cy="252"
+     inkscape:window-width="1920"
+     inkscape:window-height="1011"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg60" />
+  <defs
+     id="defs3">
+    <marker
+       style="overflow:visible"
+       id="Triangle"
+       refX="0"
+       refY="0"
+       orient="auto-start-reverse"
+       inkscape:stockid="Triangle arrow"
+       markerWidth="1"
+       markerHeight="1"
+       viewBox="0 0 1 1"
+       inkscape:isstock="true"
+       inkscape:collect="always"
+       preserveAspectRatio="xMidYMid">
+      <path
+         transform="scale(0.5)"
+         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
+         d="M 5.77,0 -2.88,5 V -5 Z"
+         id="path135" />
+    </marker>
+    <pattern
+       inkscape:collect="always"
+       xlink:href="#maskHatch"
+       id="pattern61"
+       patternTransform="rotate(45,517.80872,-65.626792)" />
+    <pattern
+       inkscape:collect="always"
+       xlink:href="#maskHatch"
+       id="pattern60"
+       patternTransform="rotate(45,517.80872,-65.626792)" />
+    <!-- Standard CAD Arrowheads -->
+    <!-- Diagonal Hatch Pattern for Inner Unpainted/Masked Contact Areas -->
+    <pattern
+       id="maskHatch"
+       width="6"
+       height="6"
+       patternTransform="rotate(45 0 0)"
+       patternUnits="userSpaceOnUse">
+      <line
+         x1="0"
+         y1="0"
+         x2="0"
+         y2="6"
+         stroke="#000000"
+         stroke-width="0.8"
+         stroke-dasharray="2,2"
+         id="line2" />
+    </pattern>
+    <!-- Ventilation Slot Symbol (Reusable) -->
+    <!-- Countersunk Hole Symbol -->
+    <g
+       id="csunk-hole">
+      <circle
+         cx="0"
+         cy="0"
+         r="4"
+         fill="#ffffff"
+         stroke="#000000"
+         stroke-width="1"
+         id="circle2" />
+      <circle
+         cx="0"
+         cy="0"
+         r="1.8"
+         fill="#000000"
+         id="circle3" />
+    </g>
+  </defs>
+  <!-- ================================================================= -->
+  <!-- TITLE & HEADER                                                    -->
+  <!-- ================================================================= -->
+  <!-- ================================================================= -->
+  <!-- VIEW 1: ISOMETRIC VIEW (LEFT SIDE)                                -->
+  <!-- ================================================================= -->
+  <!-- ================================================================= -->
+  <!-- VIEW 2: RIGHT SIDE WALL ELEVATION (TOP RIGHT)                      -->
+  <!-- ================================================================= -->
+  <text
+     x="84.820007"
+     y="10.519821"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="13px"
+     font-weight="700"
+     id="text24">RIGHT SIDE ELEVATION</text>
+  <text
+     x="84.820007"
+     y="26.519821"
+     text-anchor="middle"
+     fill="#666666"
+     font-size="10px"
+     id="text25"
+     style="fill:#000000;fill-opacity:1">(Solid Wall: 165.1 mm × 152.4 mm)</text>
+  <rect
+     x="1"
+     y="48.519821"
+     width="167.64"
+     height="181.61"
+     fill="#f8fafc"
+     stroke="#000000"
+     stroke-width="2"
+     id="rect25"
+     style="fill:#ffffff;fill-opacity:1" />
+  <line
+     x1="1"
+     y1="49.839821"
+     x2="168.64001"
+     y2="49.839821"
+     stroke="#000000"
+     stroke-width="1"
+     stroke-dasharray="3, 3"
+     id="line25" />
+  <line
+     x1="1"
+     y1="228.80983"
+     x2="168.64001"
+     y2="228.80983"
+     stroke="#000000"
+     stroke-width="1"
+     stroke-dasharray="3, 3"
+     id="line26" />
+  <use
+     href="#csunk-hole"
+     x="475"
+     y="140"
+     id="use26"
+     transform="translate(-465.17999,-71.480179)" />
+  <use
+     href="#csunk-hole"
+     x="475"
+     y="281.60999"
+     id="use27"
+     transform="translate(-465.17999,-71.480179)" />
+  <use
+     href="#csunk-hole"
+     x="625"
+     y="140"
+     id="use28"
+     transform="translate(-465.17999,-71.480179)" />
+  <use
+     href="#csunk-hole"
+     x="625"
+     y="281.60999"
+     id="use29"
+     transform="translate(-465.17999,-71.480179)" />
+  <line
+     x1="1"
+     y1="230.12981"
+     x2="1"
+     y2="263.51984"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line29"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="168.64001"
+     y1="230.12981"
+     x2="168.64001"
+     y2="263.51984"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line30"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="5.4949341"
+     y1="262.51984"
+     x2="164.14508"
+     y2="262.51984"
+     stroke="#000000"
+     stroke-width="1.16738"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line31"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
+     x="84.820007"
+     y="277.51984"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="10.5px"
+     font-weight="700"
+     id="text31">Depth: 152.4 mm ±0.2</text>
+  <line
+     x1="168.64001"
+     y1="48.519821"
+     x2="199.82001"
+     y2="48.519821"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line32"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="168.64001"
+     y1="230.12981"
+     x2="199.82001"
+     y2="230.12981"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line33"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="198.82001"
+     y1="53.049614"
+     x2="198.82001"
+     y2="226.38753"
+     stroke="#000000"
+     stroke-width="1.17235"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line34"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <g
+     transform="rotate(90,35.750094,175.06991)"
+     id="g34">
+    <text
+       x="0"
+       y="0"
+       text-anchor="middle"
+       fill="#000000"
+       font-size="10.5px"
+       font-weight="700"
+       id="text34">Height: 165.1 mm ±0.1</text>
+  </g>
+  <!-- ================================================================= -->
+  <!-- VIEW 3: END PROFILE / CROSS-SECTION (BOTTOM LEFT)                 -->
+  <!-- ================================================================= -->
+  <text
+     x="325.25751"
+     y="10.632324"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="13px"
+     font-weight="700"
+     id="text35">END PROFILE (FRONT VIEW)</text>
+  <text
+     x="325.25751"
+     y="26.632324"
+     text-anchor="middle"
+     fill="#666666"
+     font-size="10px"
+     id="text36"
+     style="fill:#000000;fill-opacity:1">(U-Channel Cross-Section)</text>
+  <path
+     d="m 310.25751,89.632321 h 28.56 V 221.71232 h -28.56"
+     fill="none"
+     stroke="#000000"
+     stroke-width="2"
+     id="path36" />
+  <path
+     d="m 310.25751,90.832321 h 27.36 V 220.51232 h -27.36"
+     fill="none"
+     stroke="#000000"
+     stroke-width="1"
+     stroke-dasharray="2, 2"
+     id="path37" />
+  <rect
+     x="310.25751"
+     y="89.632324"
+     width="27.360001"
+     height="3"
+     fill="url(#maskHatch)"
+     id="rect37"
+     style="fill:url(#pattern60)" />
+  <rect
+     x="310.25751"
+     y="218.71233"
+     width="27.360001"
+     height="3"
+     fill="url(#maskHatch)"
+     id="rect38"
+     style="fill:url(#pattern61)" />
+  <line
+     x1="310.25751"
+     y1="89.632324"
+     x2="310.25751"
+     y2="74.632324"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line38"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="338.8175"
+     y1="89.632324"
+     x2="338.8175"
+     y2="74.632324"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line39"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <line
+     x1="313.86755"
+     y1="70.632324"
+     x2="335.20746"
+     y2="70.632324"
+     stroke="#000000"
+     stroke-width="1.03728"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line40"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
+     x="324.53754"
+     y="63.632324"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="10px"
+     font-weight="700"
+     id="text40">35.7 mm</text>
+  <line
+     x1="338.8175"
+     y1="154.63232"
+     x2="380.25751"
+     y2="154.63232"
+     stroke="#000000"
+     stroke-width="0.8"
+     id="line41"
+     style="stroke-width:0.717;stroke-dasharray:none" />
+  <text
+     x="385.25751"
+     y="152.63232"
+     fill="#000000"
+     font-size="9.5px"
+     font-weight="600"
+     id="text41">Material Thickness</text>
+  <text
+     x="385.25751"
+     y="163.63232"
+     fill="#555555"
+     font-size="8.5px"
+     id="text42"
+     style="fill:#000000;fill-opacity:1">1.2 mm DC01 Steel</text>
+  <!-- ================================================================= -->
+  <!-- VIEW 4: TOP WALL ELEVATION & VENTILATION (BOTTOM RIGHT)            -->
+  <!-- ================================================================= -->
+  <!-- ================================================================= -->
+  <!-- TECHNICAL NOTES SUMMARY BOX                                       -->
+  <!-- ================================================================= -->
+  <metadata
+     id="metadata61">
+    <rdf:RDF>
+      <cc:License
+         rdf:about="http://creativecommons.org/licenses/by-sa/4.0/">
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Reproduction" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Distribution" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Notice" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Attribution" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#DerivativeWorks" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#ShareAlike" />
+      </cc:License>
+      <cc:Work
+         rdf:about="">
+        <cc:license
+           rdf:resource="http://creativecommons.org/licenses/by-sa/4.0/" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+</svg>
-- 
cgit