From 070f97103b1bde61b20521076ef30bb9ab400ea7 Mon Sep 17 00:00:00 2001 From: jazhawang Date: Thu, 2 Jun 2022 23:14:52 -0400 Subject: [PATCH] screws tests --- cases/rack/screws.scad | 108 ++- cases/rack/screws.stl | 1682 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 1786 insertions(+), 4 deletions(-) create mode 100644 cases/rack/screws.stl diff --git a/cases/rack/screws.scad b/cases/rack/screws.scad index ee0af14..4de6fb9 100644 --- a/cases/rack/screws.scad +++ b/cases/rack/screws.scad @@ -1,13 +1,113 @@ /* Some common screw dimensions */ -holeRadiusSlack = 0.5; +inf = 400; // basically infinity + +/********************************************************************************/ +// M3 dimensions + +m3HoleRadiusSlack = 0.15; m3Diameter = 3.0; m3Radius = m3Diameter/2.0; -m3RadiusSlacked = m3Radius + holeRadiusSlack; - - +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; +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); + + +module hexNutPocketNegative( + innerRadius, + widthAcrossCorners, + thickness) +{ + + union() { + + hull() { + // hexagonal cylinder representing where the nut should fit + 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); + } + + // negative volume for screw lead + 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); + } + } +} + diff --git a/cases/rack/screws.stl b/cases/rack/screws.stl new file mode 100644 index 0000000..b7680c1 --- /dev/null +++ b/cases/rack/screws.stl @@ -0,0 +1,1682 @@ +solid OpenSCAD_Model + facet normal -0.34202 0.939693 0 + outer loop + vertex 5 -1.9384 -1.635 + vertex -0.708127 -4.01599 1.635 + vertex 5 -1.9384 1.635 + endloop + endfacet + facet normal -0.34202 0.939693 0 + outer loop + vertex -0.708127 -4.01599 1.635 + vertex 5 -1.9384 -1.635 + vertex -0.708127 -4.01599 -1.635 + endloop + endfacet + facet normal 0.984808 -0.173649 0 + outer loop + vertex -3.83201 -1.39474 1.635 + vertex -3.12388 2.62125 -1.635 + vertex -3.12388 2.62125 1.635 + endloop + endfacet + facet normal 0.984808 -0.173649 0 + outer loop + vertex -3.12388 2.62125 -1.635 + vertex -3.83201 -1.39474 1.635 + vertex -3.83201 -1.39474 -1.635 + endloop + endfacet + facet normal 0.642788 0.766044 -0 + outer loop + vertex 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