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149 lines
4.4 KiB
OpenSCAD
149 lines
4.4 KiB
OpenSCAD
//////////////////////////////////////////////////////////////////////
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// LibFile: linear_bearings.scad
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// Linear Bearing clips/holders.
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// To use, add these lines to the top of your file:
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// ```
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// include <BOSL2/std.scad>
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// include <BOSL2/linear_bearings.scad>
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// ```
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//////////////////////////////////////////////////////////////////////
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include <BOSL2/metric_screws.scad>
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// Section: Functions
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// Function: get_lmXuu_bearing_diam()
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// Description: Get outside diameter, in mm, of a standard lmXuu bearing.
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// Arguments:
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// size = Inner size of lmXuu bearing, in mm.
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function get_lmXuu_bearing_diam(size) = lookup(size, [
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[ 4.0, 8.0],
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[ 5.0, 10.0],
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[ 6.0, 12.0],
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[ 8.0, 15.0],
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[ 10.0, 19.0],
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[ 12.0, 21.0],
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[ 13.0, 23.0],
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[ 16.0, 28.0],
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[ 20.0, 32.0],
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[ 25.0, 40.0],
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[ 30.0, 45.0],
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[ 35.0, 52.0],
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[ 40.0, 60.0],
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[ 50.0, 80.0],
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[ 60.0, 90.0],
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[ 80.0, 120.0],
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[100.0, 150.0]
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]);
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// Function: get_lmXuu_bearing_length()
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// Description: Get length, in mm, of a standard lmXuu bearing.
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// Arguments:
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// size = Inner size of lmXuu bearing, in mm.
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function get_lmXuu_bearing_length(size) = lookup(size, [
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[ 4.0, 12.0],
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[ 5.0, 15.0],
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[ 6.0, 19.0],
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[ 8.0, 24.0],
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[ 10.0, 29.0],
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[ 12.0, 30.0],
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[ 13.0, 32.0],
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[ 16.0, 37.0],
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[ 20.0, 42.0],
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[ 25.0, 59.0],
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[ 30.0, 64.0],
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[ 35.0, 70.0],
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[ 40.0, 80.0],
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[ 50.0, 100.0],
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[ 60.0, 110.0],
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[ 80.0, 140.0],
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[100.0, 175.0]
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]);
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// Module: linear_bearing_housing()
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// Description:
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// Creates a model of a clamp to hold a generic linear bearing cartridge.
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// Arguments:
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// d = Diameter of linear bearing. (Default: 15)
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// l = Length of linear bearing. (Default: 24)
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// tab = Clamp tab height. (Default: 7)
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// tabwall = Clamp Tab thickness. (Default: 5)
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// wall = Wall thickness of clamp housing. (Default: 3)
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// gap = Gap in clamp. (Default: 5)
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// screwsize = Size of screw to use to tighten clamp. (Default: 3)
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// orient = Orientation of the housing. Use the `ORIENT_` constants from `constants.scad`. Default: `ORIENT_X`.
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// anchor = Alignment of the housing by the axis-negative (size1) end. Use the constants from `constants.scad`. Default: `UP`
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// Example:
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// linear_bearing_housing(d=19, l=29, wall=2, tab=6, screwsize=2.5);
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module linear_bearing_housing(d=15, l=24, tab=7, gap=5, wall=3, tabwall=5, screwsize=3, orient=ORIENT_X, anchor=BOTTOM)
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{
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od = d+2*wall;
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ogap = gap+2*tabwall;
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tabh = tab/2+od/2*sqrt(2)-ogap/2;
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h = od+tab/2;
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anchors = [
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anchorpt("axis", [0,0,-tab/2/2]),
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anchorpt("screw", [0,2-ogap/2,tabh-tab/2/2],FWD),
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anchorpt("nut", [0,ogap/2-2,tabh-tab/2/2],FWD)
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];
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orient_and_anchor([l, od, h], orient, anchor, anchors=anchors, orig_orient=ORIENT_X, chain=true) {
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down(tab/2/2)
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difference() {
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union() {
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// Housing
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zrot(90) teardrop(r=od/2,h=l);
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// Base
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cube([l,od,od/2], anchor=TOP);
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// Tabs
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cube([l,ogap,od/2+tab/2], anchor=BOTTOM);
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}
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// Clear bearing space
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zrot(90) teardrop(r=d/2,h=l+0.05);
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// Clear gap
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cube([l+0.05,gap,od], anchor=BOTTOM);
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up(tabh) {
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// Screwhole
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fwd(ogap/2-2+0.01) xrot(90) screw(screwsize=screwsize*1.06, screwlen=ogap, headsize=screwsize*2, headlen=10);
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// Nut holder
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back(ogap/2-2+0.01) xrot(90) metric_nut(size=screwsize, hole=false);
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}
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}
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children();
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}
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}
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// Module: lmXuu_housing()
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// Description:
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// Creates a model of a clamp to hold a standard sized lmXuu linear bearing cartridge.
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// Arguments:
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// size = Standard lmXuu inner size.
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// tab = Clamp tab height. Default: 7
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// tabwall = Clamp Tab thickness. Default: 5
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// wall = Wall thickness of clamp housing. Default: 3
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// gap = Gap in clamp. Default: 5
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// screwsize = Size of screw to use to tighten clamp. Default: 3
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// orient = Orientation of the housing. Use the `ORIENT_` constants from `constants.scad`. Default: `ORIENT_X`.
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// anchor = Alignment of the housing by the axis-negative (size1) end. Use the constants from `constants.scad`. Default: `UP`
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// Example:
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// lmXuu_housing(size=10, wall=2, tab=6, screwsize=2.5);
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module lmXuu_housing(size=8, tab=7, gap=5, wall=3, tabwall=5, screwsize=3, orient=ORIENT_X, anchor=BOTTOM)
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{
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d = get_lmXuu_bearing_diam(size);
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l = get_lmXuu_bearing_length(size);
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linear_bearing_housing(d=d,l=l,tab=tab,gap=gap,wall=wall,tabwall=tabwall,screwsize=screwsize, orient=orient, anchor=anchor) children();
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}
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// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap
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