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linear_bearings.scad
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//////////////////////////////////////////////////////////////////////
// LibFile: linear_bearings.scad
// Linear Bearing clips/holders.
// Includes:
// include <BOSL2/std.scad>
// include <BOSL2/linear_bearings.scad>
//////////////////////////////////////////////////////////////////////
include <metric_screws.scad>
// Section: Functions
// Function: get_lmXuu_bearing_diam()
// Description: Get outside diameter, in mm, of a standard lmXuu bearing.
// Arguments:
// size = Inner size of lmXuu bearing, in mm.
function get_lmXuu_bearing_diam(size) = lookup(size, [
[ 4.0, 8.0],
[ 5.0, 10.0],
[ 6.0, 12.0],
[ 8.0, 15.0],
[ 10.0, 19.0],
[ 12.0, 21.0],
[ 13.0, 23.0],
[ 16.0, 28.0],
[ 20.0, 32.0],
[ 25.0, 40.0],
[ 30.0, 45.0],
[ 35.0, 52.0],
[ 40.0, 60.0],
[ 50.0, 80.0],
[ 60.0, 90.0],
[ 80.0, 120.0],
[100.0, 150.0]
]);
// Function: get_lmXuu_bearing_length()
// Description: Get length, in mm, of a standard lmXuu bearing.
// Arguments:
// size = Inner size of lmXuu bearing, in mm.
function get_lmXuu_bearing_length(size) = lookup(size, [
[ 4.0, 12.0],
[ 5.0, 15.0],
[ 6.0, 19.0],
[ 8.0, 24.0],
[ 10.0, 29.0],
[ 12.0, 30.0],
[ 13.0, 32.0],
[ 16.0, 37.0],
[ 20.0, 42.0],
[ 25.0, 59.0],
[ 30.0, 64.0],
[ 35.0, 70.0],
[ 40.0, 80.0],
[ 50.0, 100.0],
[ 60.0, 110.0],
[ 80.0, 140.0],
[100.0, 175.0]
]);
// Module: linear_bearing_housing()
// Description:
// Creates a model of a clamp to hold a generic linear bearing cartridge.
// Arguments:
// d = Diameter of linear bearing. (Default: 15)
// l = Length of linear bearing. (Default: 24)
// tab = Clamp tab height. (Default: 7)
// tabwall = Clamp Tab thickness. (Default: 5)
// wall = Wall thickness of clamp housing. (Default: 3)
// gap = Gap in clamp. (Default: 5)
// screwsize = Size of screw to use to tighten clamp. (Default: 3)
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Example:
// linear_bearing_housing(d=19, l=29, wall=2, tab=6, screwsize=2.5);
module linear_bearing_housing(d=15, l=24, tab=7, gap=5, wall=3, tabwall=5, screwsize=3, anchor=BOTTOM, spin=0, orient=UP)
{
od = d+2*wall;
ogap = gap+2*tabwall;
tabh = tab/2+od/2*sqrt(2)-ogap/2;
h = od+tab/2;
anchors = [
named_anchor("axis", [0,0,-tab/2/2]),
named_anchor("screw", [0,2-ogap/2,tabh-tab/2/2],FWD),
named_anchor("nut", [0,ogap/2-2,tabh-tab/2/2],FWD)
];
attachable(anchor,spin,orient, size=[l, od, h], anchors=anchors) {
down(tab/2/2)
difference() {
union() {
// Housing
zrot(90) teardrop(r=od/2,h=l);
// Base
cube([l,od,od/2], anchor=TOP);
// Tabs
cube([l,ogap,od/2+tab/2], anchor=BOTTOM);
}
// Clear bearing space
zrot(90) teardrop(r=d/2,h=l+0.05);
// Clear gap
cube([l+0.05,gap,od], anchor=BOTTOM);
up(tabh) {
// Screwhole
fwd(ogap/2-2+0.01) generic_screw(screwsize=screwsize*1.06, screwlen=ogap, headsize=screwsize*2, headlen=10, orient=FWD);
// Nut holder
back(ogap/2-2+0.01) metric_nut(size=screwsize, hole=false, anchor=BOTTOM, orient=BACK);
}
}
children();
}
}
// Module: lmXuu_housing()
// Description:
// Creates a model of a clamp to hold a standard sized lmXuu linear bearing cartridge.
// Arguments:
// size = Standard lmXuu inner size.
// tab = Clamp tab height. Default: 7
// tabwall = Clamp Tab thickness. Default: 5
// wall = Wall thickness of clamp housing. Default: 3
// gap = Gap in clamp. Default: 5
// screwsize = Size of screw to use to tighten clamp. Default: 3
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Example:
// lmXuu_housing(size=10, wall=2, tab=6, screwsize=2.5);
module lmXuu_housing(size=8, tab=7, gap=5, wall=3, tabwall=5, screwsize=3, anchor=BOTTOM, spin=0, orient=UP)
{
d = get_lmXuu_bearing_diam(size);
l = get_lmXuu_bearing_length(size);
linear_bearing_housing(d=d, l=l, tab=tab, gap=gap, wall=wall, tabwall=tabwall, screwsize=screwsize, orient=orient, spin=spin, anchor=anchor) children();
}
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap