BOSL2/linear_bearings.scad

//////////////////////////////////////////////////////////////////////
// LibFile: linear_bearings.scad
//   Linear Bearing clips/holders.
//   To use, add these lines to the top of your file:
//   ```
//   include <BOSL2/std.scad>
//   include <BOSL2/metric_screws.scad>
//   include <BOSL2/linear_bearings.scad>
//   ```
//////////////////////////////////////////////////////////////////////

/*
BSD 2-Clause License

Copyright (c) 2017-2019, Revar Desmera
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


// 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)
//   orient = Orientation of the housing.  Use the `ORIENT_` constants from `constants.scad`.  Default: `ORIENT_X`.
//   anchor = Alignment of the housing by the axis-negative (size1) end.  Use the constants from `constants.scad`.  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, orient=ORIENT_X, anchor=UP)
{
	od = d+2*wall;
	ogap = gap+2*tabwall;
	tabh = tab/2+od/2*sqrt(2)-ogap/2;
	orient_and_anchor([l, od, od], orient, anchor, orig_orient=ORIENT_X, chain=true) {
		difference() {
			union() {
				zrot(90) teardrop(r=od/2,h=l);
				up(tabh) cube(size=[l,ogap,tab+0.05], center=true);
				down(od/4) cube(size=[l,od,od/2], center=true);
			}
			zrot(90) teardrop(r=d/2,h=l+0.05);
			up((d*sqrt(2)+tab)/2)
				cube(size=[l+0.05,gap,d+tab], center=true);
			up(tabh) {
				fwd(ogap/2-2+0.01)
					xrot(90) screw(screwsize=screwsize*1.06, screwlen=ogap, headsize=screwsize*2, headlen=10);
				back(ogap/2+0.01)
					xrot(90) metric_nut(size=screwsize, hole=false);
			}
		}
		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
//   orient = Orientation of the housing.  Use the `ORIENT_` constants from `constants.scad`.  Default: `ORIENT_X`.
//   anchor = Alignment of the housing by the axis-negative (size1) end.  Use the constants from `constants.scad`.  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, orient=ORIENT_X, anchor=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, anchor=anchor) children();
}


// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap