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parametrize screw/hex nut types

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zhao
2023-01-01 16:20:47 -05:00
parent d0c89d13c6
commit 1b923fa215
4 changed files with 162 additions and 188 deletions
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115
cases/rack2/screws.scad
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@ -1,113 +1,80 @@
/* Some common screw dimensions and helper functions/modules */
/* Some common screw dimensions */
inf = 400; // basically infinity
inf = 400;
/********************************************************************************/
// M3 dimensions
m3HoleRadiusSlack = 0.15;
m3Diameter = 3.0;
m3Radius = m3Diameter/2.0;
m3Radius = m3Diameter / 2.0;
m3RadiusSlacked = m3Radius + m3HoleRadiusSlack;
// legacy TODO: replace
m3ptr = m3RadiusSlacked;
// NUTS!
m3HexNutWidthAcrossFlats = 5.41;
m3HexNutWidthAcrossCorners = FtoG(m3HexNutWidthAcrossFlats);
m3HexNutThickness = 2.18;
module m3HexNutPocketNegative() {
hexNutPocketNegative(m3RadiusSlacked,
m3HexNutWidthAcrossCorners/2 + 0.1,
m3HexNutThickness + 0.2);
}
// TODO: remove test
*difference() {
cube(size=[8,12,5], center=true);
rotate(a=[0,0,20])
m3HexNutPocketNegative();
}
*m3HexNutPocketNegative();
/********************************************************************************/
// M4 dimensions
m4HoleRadiusSlack = 0.15;
m4Diameter = 4.0;
m4Radius = m4Diameter/2.0;
m4Radius = m4Diameter / 2.0;
m4RadiusSlacked = m4Radius + m4HoleRadiusSlack;
m4HexNutWidthAcrossFlats = 6.89;
m4HexNutWidthAcrossCorners = FtoG(m4HexNutWidthAcrossFlats);
m4HexNutThickness = 3.07;
module m4HexNutPocketNegative() {
hexNutPocketNegative(m4RadiusSlacked,
m4HexNutWidthAcrossCorners/2 + 0.1,
m4HexNutThickness + 0.2);
}
// TODO: remove test
*difference() {
translate(v=[0,1,0])
cube(size=[10,12,6], center=true);
rotate(a=[0,0,20])
m4HexNutPocketNegative();
}
*m4HexNutPocketNegative();
/********************************************************************************/
// Convert a regular hexagon widthAcrossFlats to widthAcrossCorners
function FtoG(widthAcrossFlats) = widthAcrossFlats * (2/sqrt(3));
// Convert a regular hexagon widthAcrossCorners to widthAcrossFlats
function GtoF(widthAcrossCorners) = widthAcrossCorners * (sqrt(3)/2);
function screwRadiusSlacked(screwType) =
(screwType == "m3")
? m3RadiusSlacked
: (screwType == "m4")
? m4RadiusSlacked
: error("Unsupported screw type");
module hexNutPocketNegative(
innerRadius,
widthAcrossCorners,
thickness)
module hexNutPocket_N(screwType) {
if (screwType == "m3") {
hexNutPocketHelper_N(m3RadiusSlacked,
m3HexNutWidthAcrossCorners / 2 + 0.1,
m3HexNutThickness + 0.2);
} else if (screwType == "m4") {
hexNutPocketHelper_N(m4RadiusSlacked,
m4HexNutWidthAcrossCorners / 2 + 0.1,
m4HexNutThickness + 0.2);
} else {
error("Unsupported screw type");
}
}
module hexNutPocketHelper_N(
innerRadius,
widthAcrossCorners,
thickness)
{
union() {
hull() {
// hexagonal cylinder representing where the nut should fit
cylinder(r=widthAcrossCorners, h=thickness, center=true, $fn=6);
cylinder(r = widthAcrossCorners, h = thickness, center = true, $fn = 6);
// negative volume for sliding in the nut
translate(v=[inf,0,0])
cylinder(r=widthAcrossCorners, h=thickness, center=true, $fn=6);
translate(v = [inf, 0, 0])
cylinder(r = widthAcrossCorners, h = thickness, center = true, $fn = 6);
}
// negative volume for screw lead
translate(v=[0,0,-10])
cylinder(r=innerRadius, h = inf, $fn=32);
translate(v = [0, 0, - 10])
cylinder(r = innerRadius, h = inf, $fn = 32);
hull() {
translate(v=[inf,0,0])
cylinder(r=innerRadius, h = inf, $fn=32);
cylinder(r=innerRadius, h = inf, $fn=32);
translate(v = [inf, 0, 0])
cylinder(r = innerRadius, h = inf, $fn = 32);
cylinder(r = innerRadius, h = inf, $fn = 32);
}
}
}
// Convert a regular hexagon widthAcrossFlats to widthAcrossCorners
function FtoG(widthAcrossFlats) = widthAcrossFlats * (2 / sqrt(3));
// Convert a regular hexagon widthAcrossCorners to widthAcrossFlats
function GtoF(widthAcrossCorners) = widthAcrossCorners * (sqrt(3) / 2);