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-rw-r--r--pictures/u-channel.svg401
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diff --git a/pictures/u-channel.svg b/pictures/u-channel.svg
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+<?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>
generated by cgit (git 2.34.1) at 2026-08-11 12:10:01 +0000