File:Quick return crank motion.gif
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Size of this preview: 435 × 599 pixels. Other resolutions: 174 × 240 pixels | 499 × 687 pixels.
Original file (499 × 687 pixels, file size: 88 KB, MIME type: image/gif, looped, 25 frames, 2.5 s)
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Summary
[edit]DescriptionQuick return crank motion.gif |
English: Quick return crank motion |
Date | |
Source | Own work, inspired by http://507movements.com/mm_100.html |
Author | MichaelFrey |
Other versions |
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Code
[edit]//Quick return crank motion //created by Michael Frey //released on Wikimedia commons under //CC-BY-SA 3.0 license //(c) Michael Frey //--------------------- //inspired by //http://507movements.com/mm_100.html use <../lib/geom2D.scad>; ang = $t*360; lc=20; //Crank length org=[0,0]; A=[cos(-ang)*lc, sin(-ang)*lc]; B=[0,50]; alpha=getAngle2D(A,B); C=addAngle2D(B,alpha+90,100); C1=addAngle2D(B,alpha+90,20); C2=addAngle2D(B,alpha+90,100-20); C3=addAngle2D(B,alpha+90,-50); translate([0,0,-3]){ color([0,1,0]) translate(org) cylinder(r=40,h=2,center = true); color([0,0,0]) translate(org) cylinder(r=5,h=3,center = true); } color([0,0.5,0]) translate(A) cylinder(r=5.9,h=4,center = true); color([0.5,0,0]) translate(B) cylinder(r=5,h=5,center = true); difference(){ hull(){ translate(B) cylinder(r=10,h=2,center = true); translate(C) cylinder(r=10,h=2,center = true); } hull(){ translate(C1) cylinder(r=6,h=5,center = true); translate(C2) cylinder(r=6,h=5,center = true); } } hull(){ translate(B) cylinder(r=5,h=2,center = true); translate(C3) cylinder(r=5,h=2,center = true); }
//created by Michael Frey //released on Wikimedia commons under //CC-BY-SA 3.0 license //(c) Michael Frey function add2D(v1,v2) = [v1[0]+v2[0], v1[1]+v2[1]]; function sub2D(v1,v2) = [v1[0]-v2[0], v1[1]-v2[1]]; function addAngle2D(v1,ang,l) = [ v1[0]+cos(ang)*l, v1[1]-sin(ang)*l, ]; function negativ(val) = (val==abs(val)) ? false: true; function getAngle2D(v1,v2=[0,0]) = let(dx=v2[0]-v1[0]) let(dy=v2[1]-v1[1]) let(ang=atan((dx)/(dy))) (negativ(dy) ) ? ang-180 : ang; function getAngle2Ds(v1,v2=[0,0]) = let(dx=v2[0]-v1[0]) let(dy=v2[1]-v1[1]) atan((dx)/(dy)); function getAngle2D2(v1,v2=[0,0]) = let(dx=v2[0]-v1[0]) let(dy=v2[1]-v1[1]) atan2((dx),(dy)); function scale2D(v1,c=1)= [ v1[0]*c, v1[1]*c, ]; function midpoint2D(v1,v2)= [ (v1[0]+v2[0])/2, (v1[1]+v2[1])/2 ]; function scaleToLength2D(v1,v2,l)= let(c=l/length2D(v1,v2)) [ (v2[0]-v1[0])*c+v1[0], (v2[1]-v1[1])*c+v1[1], ]; //Calculating the crossing point of two vectors, //defined by two coordinates each function crossPoint(v1,v2,v3,v4) = [ ( (v4[0]-v3[0])*(v2[0]*v1[1]-v1[0]*v2[1]) - (v2[0]-v1[0])*(v4[0]*v3[1]-v3[0]*v4[1]) ) / ( (v4[1]-v3[1])*(v2[0]-v1[0]) - (v2[1]-v1[1])*(v4[0]-v3[0]) ) , ( (v1[1]-v2[1])*(v4[0]*v3[1]-v3[0]*v4[1]) - (v3[1]-v4[1])*(v2[0]*v1[1]-v1[0]*v2[1]) ) / ( (v4[1]-v3[1])*(v2[0]-v1[0]) - (v2[1]-v1[1])*(v4[0]-v3[0]) ) ]; function length2D(v1,v2=[0,0])= sqrt( (v1[0]-v2[0])*(v1[0]-v2[0]) + (v1[1]-v2[1])*(v1[1]-v2[1]) ); //Law of cosines function VVLL2D(v1,v2,l1,l2) = let(sAB = length2D(v1,v2)) let(ang12=getAngle2D(v2,v1)) let(ang0= acos( (l2*l2-l1*l1-sAB*sAB)/ (-abs(2*sAB*l1)) )) addAngle2D( v1=v1, ang=ang0+ang12-90, l=-l1 );
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[edit]I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 11:28, 2 October 2017 | 499 × 687 (88 KB) | MichaelFrey (talk | contribs) | User created page with UploadWizard |
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