OpenSCAD Linkages Library by machineree

Last crawled date: 3 years ago

OpenSCAD_Linkages_Library
OpenSCAD library to create multiple types of mechanical linkages in 2D and 3D.
Thingiverse Thing: 2081445
Check out on GitHub
Check out http://machineree.com/#openscad for more information and projects.
v.02 - February 5, 2017

linkages.scad: 2D & 3D linkages in one library
Added help function: linkagehelp();
Added linkwidthangle, linksurroundangle in 2D & 3D for angled flat bar linkages with 2/3 holes
Renamed modules to fit scheme
Changed slots in linkwidth & linksurround to true/false
scale(in()) for inches
scale(cm()) for centimeters

v.01 - January 31, 2017
linkages.scad: 3D Linkages
linkages2D.scad: 2D Linkages to be exported .SVG or .DXF
linkageex.scad: examples of some of the operations and functions of the library
Add to your library folder in OpenSCAD and use the include function to begin using these modules.
include
OpenSCAD Libraries (Manual)
Default units are mm.
3D Linkages


linkwidth(holeD,width,length,thick,slot=false);
holeD: diameter of the holes at each end
width: width of the part (must be greater than holeD)
length: distance between outer holes from center
thick: thickness of the part or Z value
slot: true for a slot


linkwidththree(holeD,width,length,thick,three);
holeD: diameter of the holes at each end
width: width of the part
length: distance between outer holes from center
thick: thickness of the part or Z value
three: distance a third hole is from the first hole, choose length/2 for center hole


linkwidthrot(holeD,width,length,thick,rot);
holeD: diameter of the holes at each end
width: width of the part
length: distance between outer holes from center
thick: thickness of the part or Z value
rot: angle of rotation for the second hole to create angular linkages


linkwidthangle(holeD,width,length1,length2,thick,angle);
holeD: diameter of the holes at each end
width: width of the part (must be greater than holeD)
length1: distance between holes from center, first section
length2: distance between holes from center, angled/second section
thick: thickness of the part or Z value
angle: angle of second section referenced from first section


linksurround(holeD,surround,length,thick,slot=false);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length: distance between outer holes from center
thick: thickness of the part or Z value
slot: true for a slot


linksurroundthree(holeD,surround,length,thick,three);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length: distance between outer holes from center
thick: thickness of the part or Z value
three: distance a third hole is from the first hole, choose length/2 for center hole


linksurroundrot(holeD,surround,length,thick,rot);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length: distance between outer holes from center
thick: thickness of the part or Z value
rot: angle of rotation for the second hole to create angular linkages


linksurroundangle(holeD,surround,length1, length2,thick, angle);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length1: distance between holes from center, first section
length2: distance between holes from center, angled/second section
thick: thickness of the part or Z value
angle: angle of second section referenced from first section

2D Linkages


linkwidth2D(holeD,width,length,slot=false);
holeD: diameter of the holes at each end
width: width of the part (must be greater than holeD)
length: distance between outer holes from center
slot: true for a slot


linkwidththree2D(holeD,width,length,three);
holeD: diameter of the holes at each end
width: width of the part
length: distance between outer holes from center
three: distance a third hole is from the first hole, choose length/2 for center hole


linkwidthangle2D(holeD,width,length1,length2,angle);
holeD: diameter of the holes at each end
width: width of the part (must be greater than holeD)
length1: distance between holes from center, first section
length2: distance between holes from center, angled/second section
angle: angle of second section referenced from first section


linksurround2D(holeD,surround,length,slot=false);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length: distance between outer holes from center
slot: true for a slot


linksurroundthree2D(holeD,surround,length,three);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length: distance between outer holes from center
three: distance a third hole is from the first hole, choose length/2 for center hole


linksurroundangle2D(holeD,surround,length1,length2,angle);
holeD: diameter of the holes at each end
surround: distance from the edge of the hole to the edge of the part
length1: distance between holes from center, first section
length2: distance between holes from center, angled/second section
angle: angle of second section referenced from first section

Naming Strategy:
link+(width/surround)+(three/rot/angle)+(2D)
Examples!
Using basic linkwidth and the slot:
include

linkwidth(2,5,20,1);

translate([7.5,0,0]) linkwidth(2,5,20,1,slot=true);

Comparison of linkwidth to linksurround with the same values in mm:
include

linkwidth(2,5,20,1);

translate([15,0,0]) linksurround(2,5,20,1);

Using basic linkwidththree to determine custom distance to middle hole using a specific number or dividing by length used for the linkage:
include

linkwidththree(2,5,20,1,4);

translate([7.5,0,0]) linkwidththree(2,5,20,1,20/2);

Using linkwidthrot for complicated angled/twist linkages, using positive and negative degrees:
include

linkwidthrot(2,5,20,1,45);

translate([7.5,0,0]) linkwidthrot(2,5,20,1,-45);

translate([15,0,0]) linkwidthrot(2,5,20,1,90);

Using linkwidthrot and 90 degree linkages with flat sides. This is accomplished by making the height value the same as the width value. For linksurroundrot the height would have to be holeD+surround+surround. This is the result:
include

linkwidthrot(2,5,20,5,90);

Using linkwidthangle to create flat angled linkages, using different length segments, positive and negative angles:
include

linkwidthangle(2,5,20,20,1,45);

translate([15,0,0]) linkwidthangle(2,5,20,40,1,-90);

Comparison of scaling the same linkage in inches, centimeters, and millimeters:
include

scale(in()) linkwidth(.25,.5,3,.125);

translate([15,0,0]) scale(cm()) linkwidth(.25,.5,3,.125);

translate([22.5,0,0]) linkwidth(.25,.5,3,.125);

Simple 2X Pantograph displaying pieces, colors, and wireframe:
include

range=12;
thick=1;

color("red")
linkwidththree (1,2,range,thick,range/4);
color("blue")
translate([range/2,range/4,0])linkwidththree (1,2,3*range/4,thick,range/4);
color("yellow")
translate([0,range/4,thick]) rotate([0,0,-90]) linkwidth(1,2,range/2,thick);
color("green")
translate([0,range,thick]) rotate([0,0,-90]) linkwidththree (1,2,range,thick,range/2);

Output of help within OpenSCAD console:
include

linkagehelp();