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linear_bearings.scad
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linear_bearings.scad
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//////////////////////////////////////////////////////////////////////
// LibFile: linear_bearings.scad
// Mounts and models for LMxUU style linear bearings.
// Includes:
// include <BOSL2/std.scad>
// include <BOSL2/linear_bearings.scad>
// FileGroup: Parts
// FileSummary: Mounts for LMxUU style linear bearings.
//////////////////////////////////////////////////////////////////////
include <screws.scad>
// Section: Generic Linear Bearings
// Module: linear_bearing_housing()
// Synopsis: Creates a generic linear bearing mount clamp.
// SynTags: Geom
// Topics: Parts, Bearings
// See Also: linear_bearing(), lmXuu_info(), ball_bearing()
// Usage:
// linear_bearing_housing(d, l, tab, gap, wall, tabwall, screwsize) [ATTACHMENTS];
// 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: 8)
// 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#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
// Example:
// linear_bearing_housing(d=19, l=29, wall=2, tab=8, screwsize=2.5);
module linear_bearing_housing(d=15, l=24, tab=8, 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/2-1;
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) {
screwsize = is_string(screwsize)? screwsize : str("M",screwsize);
// Screwhole
fwd(ogap/2-2+0.01)
screw_hole(str(screwsize,",",ogap), head="socket", counterbore=3, anchor="head_bot", orient=FWD, $fn=12);
// Nut holder
back(ogap/2-2+0.01)
nut_trap_inline(tabwall, screwsize, orient=BACK);
}
}
children();
}
}
// Module: linear_bearing()
// Synopsis: Creates a generic linear bearing cartridge.
// SynTags: Geom
// Topics: Parts, Bearings
// See Also: linear_bearing_housing(), lmXuu_info(), ball_bearing()
// Usage:
// linear_bearing(l, od, id, length) [ATTACHMENTS];
// Description:
// Creates a rough model of a generic linear ball bearing cartridge.
// Arguments:
// l/length = The length of the linear bearing cartridge.
// od = The outer diameter of the linear bearing cartridge.
// id = The inner diameter of the linear bearing cartridge.
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
// Example:
// linear_bearing(l=24, od=15, id=8);
module linear_bearing(l, od=15, id=8, length, anchor=CTR, spin=0, orient=UP) {
l = first_defined([l, length, 24]);
attachable(anchor,spin,orient, d=od, l=l) {
color("silver") {
tube(id=id, od=od, l=l-1);
tube(id=od-1, od=od, l=l);
tube(id=id, od=id+1, l=l);
tube(id=id+2, od=od-2, l=l);
}
children();
}
}
// Section: lmXuu Linear Bearings
// Module: lmXuu_housing()
// Synopsis: Creates a standardized LM*UU linear bearing mount clamp.
// SynTags: Geom
// Topics: Parts, Bearings
// See Also: linear_bearing(), linear_bearing_housing(), lmXuu_info(), lmXuu_bearing(), lmXuu_housing(), ball_bearing()
// Usage:
// lmXuu_housing(size, tab, gap, wall, tabwall, screwsize) [ATTACHMENTS];
// 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#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-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)
{
info = lmXuu_info(size);
d = info[0];
l = info[1];
linear_bearing_housing(d=d, l=l, tab=tab, gap=gap, wall=wall, tabwall=tabwall, screwsize=screwsize, orient=orient, spin=spin, anchor=anchor) children();
}
// Module: lmXuu_bearing()
// Synopsis: Creates a standardized LM*UU linear bearing cartridge.
// SynTags: Geom
// Topics: Parts, Bearings
// See Also: linear_bearing(), linear_bearing_housing(), lmXuu_info(), lmXuu_bearing(), lmXuu_housing(), ball_bearing()
// Usage:
// lmXuu_bearing(size) [ATTACHMENTS];
// Description:
// Creates a model of an lmXuu linear ball bearing cartridge.
// Arguments:
// size = Standard lmXuu inner size.
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
// Example:
// lmXuu_bearing(size=10);
module lmXuu_bearing(size=8, anchor=CTR, spin=0, orient=UP) {
info = lmXuu_info(size);
linear_bearing(l=info[1], id=size, od=info[0], anchor=anchor, spin=spin, orient=orient) children();
}
// Section: lmXuu Linear Bearing Info
// Function: lmXuu_info()
// Synopsis: Returns the sizes of a standard LM*UU linear bearing cartridge.
// Topics: Parts, Bearings
// See Also: linear_bearing(), linear_bearing_housing(), lmXuu_info(), lmXuu_bearing(), lmXuu_housing(), ball_bearing()
// Usage:
// diam_len = lmXuu_info(size);
// Description:
// Get dimensional info for a standard metric lmXuu linear bearing cartridge.
// Returns `[DIAM, LENGTH]` for the cylindrical cartridge.
// Arguments:
// size = Inner diameter of lmXuu bearing, in mm.
function lmXuu_info(size) =
let(
data = [
// size, diam, length
[ 4, 8, 12],
[ 5, 10, 15],
[ 6, 12, 19],
[ 8, 15, 24],
[ 10, 19, 29],
[ 12, 21, 30],
[ 13, 23, 32],
[ 16, 28, 37],
[ 20, 32, 42],
[ 25, 40, 59],
[ 30, 45, 64],
[ 35, 52, 70],
[ 40, 60, 80],
[ 50, 80, 100],
[ 60, 90, 110],
[ 80, 120, 140],
[100, 150, 175],
],
found = search([size], data, 1)[0]
)
assert(found!=[], str("Unsupported lmXuu linear bearing size: ", size))
select(data[found], 1, -1);
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap