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Improved gear/rack generation.

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Revar Desmera
2017-03-19 17:39:40 -07:00
parent 59c399aaa8
commit 27f9a8ead4
1 changed files with 11 additions and 10 deletions
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21
publicDomainGearV1.1.scad
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@@ -78,22 +78,23 @@ module gear (
t = mm_per_tooth/2-backlash/2; //tooth thickness at pitch circle
k = -iang(b, p) - t/2/p/pi*180; //angle to where involute meets base circle on each side of tooth
difference() {
for (i = [0:number_of_teeth-teeth_to_hide-1] )
rotate([0,0,i*360/number_of_teeth])
linear_extrude(height = thickness, center = true, convexity = 10, twist = twist)
linear_extrude(height = thickness, center = true, convexity = 10, twist = twist)
for (i = [0:number_of_teeth-teeth_to_hide-1] )
rotate([0,0,i*360/number_of_teeth])
polygon(
points=[
[0, -hole_diameter/10],
polar(hole_diameter/10, -181/number_of_teeth),
polar(r, -181/number_of_teeth),
polar(r, r<b ? k : -180/number_of_teeth),
q7(0/5,r,b,c,k, 1),q7(1/5,r,b,c,k, 1),q7(2/5,r,b,c,k, 1),q7(3/5,r,b,c,k, 1),q7(4/5,r,b,c,k, 1),q7(5/5,r,b,c,k, 1),
q7(5/5,r,b,c,k,-1),q7(4/5,r,b,c,k,-1),q7(3/5,r,b,c,k,-1),q7(2/5,r,b,c,k,-1),q7(1/5,r,b,c,k,-1),q7(0/5,r,b,c,k,-1),
polar(r, r<b ? -k : 180/number_of_teeth),
polar(r, 181/number_of_teeth)
polar(r, 181/number_of_teeth),
polar(hole_diameter/10, 181/number_of_teeth),
],
paths=[[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]]
paths=[[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]]
);
cylinder(h=2*thickness+1, r=hole_diameter/2, center=true, $fn=20);
cylinder(h=2*thickness+1, r=hole_diameter/2, center=true);
}
};
//these 4 functions are used by gear
@@ -115,9 +116,9 @@ module rack (
pi = 3.1415926;
a = mm_per_tooth / pi; //addendum
t = a*cos(pressure_angle)-1; //tooth side is tilted so top/bottom corners move this amount
for (i = [0:number_of_teeth-1] )
translate([i*mm_per_tooth,0,0])
linear_extrude(height = thickness, center = true, convexity = 10)
linear_extrude(height = thickness, center = true, convexity = 10)
for (i = [0:number_of_teeth-1] )
translate([i*mm_per_tooth,0,0])
polygon(
points=[
[-mm_per_tooth * 3/4, a-height],