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ednisley/AS30 helmet mount.scad

Created April 24, 2025 18:50
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OpenSCAD source code: Sony AS30V camera mounting plate for Bell bike helmet
Raw
AS30 helmet mount.scad
// Sony AS30 helmet mount
// Ed Nisley - KE4ZNU
// 2025-04-20
include <BOSL2/std.scad>
Layout = "Show"; // [Show,Build,Ball,Tab,Glue]
Gap = 5; // [0:5:20]
/* [Hidden] */
HoleWindage = 0.2;
Protrusion = 0.1;
WallThick = 1.0; // enough stiffness against flat pad
HelmetRadius = 153.0; // from chord equation on curved pad = magic number
Groove = [30.0,100,3.0,]; // roughly the groove along helmet midline
Pad = [38,53,10]; // baseplate size, thick enough without fancy trig
Strap = [3.0,15.0,10*Pad.z]; // hook-n-loop strap holes, double-thick
Tie = [100,6.0,2.0 + Protrusion]; // cable tie around camera
TieOffset = 14.0; // … from end of pad
$fn=96;
//----------
// Define shapes
module Ball() {
difference() {
sphere(r=HelmetRadius);
Tab();
}
}
// Rough approximation of the helmet groove
module Tab() {
m = 2.0; // roughly the chord height beyond the tab
rotate_extrude(convexity=10) {
right(HelmetRadius)
zrot(180)
polygon([
[0,0],
[0,Groove.x/2],[Groove.z + m,Groove.x/2],[m,0],
[Groove.z + m,-Groove.x/2],[0,-Groove.x/2],
[0,0]
],convexity=10);
}
}
// Baseplate with all the cutouts
module BasePlate() {
difference() {
linear_extrude(height=Pad.z,convexity=10)
import("AS30 Baseplate layout.svg",layer="Baseplate");
up(WallThick + HelmetRadius)
yrot(90)
Ball();
for (i = [-1,1]) // strap clearance at edge of helmet hole
right(i*Groove.x/2)
cube([(Pad.x - Groove.x)/2,Strap.y,Strap.z],center=true);
for (i = [-1,1]) // cut through edge of pad
right(i*Pad.x/2)
cube([(Pad.x - Groove.x),Strap.y,Strap.z],center=true);
for (j = [-1,1])
fwd(j*(Pad.y/2 - TieOffset)) up(WallThick)
cuboid(Tie,anchor=BOTTOM);
}
}
//----------
// Build things
if (Layout == "Glue")
projection(cut=true)
BasePlate();
if (Layout == "Tab")
Tab();
if (Layout == "Show") {
xrot(180)
BasePlate();
down(WallThick + HelmetRadius + Gap)
yrot(90)
color("Orange",0.75) Ball();
}
if (Layout == "Build")
BasePlate();
if (Layout == "Ball")
Ball();
Raw
gistfile1.txt
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
width="11in"
height="8.5in"
viewBox="0 0 279.40056 215.90043"
version="1.1"
id="SVGRoot"
inkscape:version="1.4.1 (93de688d07, 2025-03-30)"
sodipodi:docname="AS30 Baseplate layout.svg"
xml:space="preserve"
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="namedview7"
pagecolor="#ffffff"
bordercolor="#0000ff"
borderopacity="1"
inkscape:pageshadow="0"
inkscape:pageopacity="0"
inkscape:pagecheckerboard="1"
inkscape:document-units="mm"
showgrid="true"
units="mm"
gridtolerance="9.9"
guidetolerance="10.4"
inkscape:snap-perpendicular="true"
inkscape:snap-tangential="true"
width="700mm"
borderlayer="false"
inkscape:showpageshadow="true"
viewbox-width="700"
guidecolor="#ff00e3"
guideopacity="0.49803922"
inkscape:zoom="1.6945884"
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inkscape:cy="111.82656"
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objecttolerance="31"
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spacingx="5"
spacingy="5"
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empspacing="2"
originx="148.5"
originy="127.29919"
color="#ff0000"
opacity="0.18431373"
empcolor="#4040ff"
empopacity="0.49411765"
visible="true" /><sodipodi:guide
position="157.7549,120.64599"
orientation="1,0"
id="guide1"
inkscape:locked="false" /></sodipodi:namedview><defs
id="defs2" /><g
inkscape:label="Baseplate"
inkscape:groupmode="layer"
id="layer1"
transform="translate(0,5.4354331)"><path
id="path1"
style="fill:none;fill-rule:evenodd;stroke:#0c96d9;stroke-width:0.0998686;stroke-linejoin:round"
d="m -18.99969,190.42075 3.09576,-6.45581 h 32.08112 l 2.82285,6.45581 -10e-6,40.00473 -3.02778,6.53957 -31.33905,-0.14658 -3.63324,-6.39299 z"
sodipodi:nodetypes="ccccccccc"
inkscape:label="Aligned path" /></g><g
inkscape:groupmode="layer"
id="layer2"
inkscape:label="Original"><image
width="57.658115"
height="65.193459"
preserveAspectRatio="none"
xlink:href="AS30%20Baseplate%20scan.jpg"
id="image1"
x="112.42073"
y="67.772316"
transform="rotate(0.87516737,-355.84202,2.7177945)"
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sodipodi:nodetypes="ccccccccc"
transform="translate(0,5.4354331)" /></g><metadata
id="metadata11"><rdf:RDF><cc:Work
rdf:about=""><cc:license
rdf:resource="http://creativecommons.org/licenses/by-nc-sa/4.0/" /></cc:Work><cc:License
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