sjc/gearhinge
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Minor updates

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- updated gear sector to eliminate overhang when printed at rot=0
- added comment for old box
- minor work on helix angle...needs more
This commit is contained in:
Stephen Carpenter
2021-01-10 02:00:00 -05:00
committed by sjc
parent 79cc5fcfa2
commit df855a9875
1 changed files with 31 additions and 20 deletions
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51
GearHinge.scad
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@@ -4,11 +4,18 @@ use <PolyGear/shortcuts.scad>
chamfer=30;
axis_angle=0;
helix_angle = [ for (x=linspace(-1,1,11)) exp(-abs(x))*10*sign(x) ];
//helix_angle = [ for (x=linspace(-1,1,11)) exp(-abs(x))*10*sign(x) ];
helix_turns = 3;
helix_steps = $preview ? 7 : 11;
helix_angle = [ for (x=linspace(-1,1,helix_steps)) exp(-abs(x))*10*sign(x) ];
//helix_angle = [ for (x=linspace(-helix_turns,helix_turns,helix_steps)) exp(-abs(x))*10*sign(x) ];
//helix_angle = constant(axis_angle/2);
//width = 100;
width=18;
//width = 10;
width=10;
N = 9;
// Force same number of teeth
N1=N;
@@ -28,26 +35,20 @@ SideW=tol+BackW;
echo("Reference Diameter (MeshD): ", MeshD);
//rot=360/N1*$t;
// rot=90-90*$t;
//rot=90-90*$t;
rot=45;
//rot=0;
//rot=90;
//axis_angle = -50;
//meshed(rot=rot);
$fa = ($preview) ? 12 : .01;
$fs = ($preview) ? 2 : .01;
$incolor = false;
$incolor = true;
gear_hinge(rot=rot, box=false, rounded_case=true);
//translate([50,0,0]) gear_hinge(rot=rot, box=false, box_top=true);
module gear_sector() {
CyS(r=MeshD, h=width, w1=215, w2=20);
CyS(r=MeshD/2 - 2, h=width, w1=20, w2=90);
}
module gear_hinge(
box=true,
rounded_case=false,
@@ -78,12 +79,17 @@ module gear_track_block() {
}
}
module gear_sector(meshd, width) {
CyS(r=meshd, h=width, w1=215, w2=00);
CyS(r=meshd/2 - 2, h=width, w1=-1, w2=90);
}
module blue_gear() {
render() {
intersection() {
spur_gear(n=N1, w=width, m=Module, chamfer=30, helix_angle = helix_angle );
difference() {
gear_sector();
gear_sector(meshd=MeshD, width=width);
// Shaft Hole
cylinder(d=ShaftD, h=width+2, center=true);
@@ -99,21 +105,21 @@ module blue_gear() {
}
// leaf arm
//translate([MeshD/2 - 2*Module,11,0]) cube([4,20,width+1], center=true);
translate([2,11.6,0]) rotate([0,0,0]) leaf_arm(left=true);
translate([2,11.6,0]) rotate([0,0,0]) leaf_arm(left=true, h=width+4);
}
module red_gear()
{
render() difference() {
union() {
CyS(r=MeshD/2 - 2, h=width, w1=90, w2=160);
CyS(r=MeshD/2 - 2, h=width, w1=90, w2=190);
intersection() {
spur_gear(n=N2, w=width, m=Module, chamfer=30, helix_angle=-helix_angle);
CyS(r=MeshD, h=width, w1=150, w2=-30);
CyS(r=MeshD, h=width, w1=180, w2=-30);
}
// leaf arm
translate([-2,11.6,0]) leaf_arm(left=false);
translate([-2,11.6,0]) leaf_arm(left=false, h=width+4);
}
// Shaft Hole
@@ -125,7 +131,7 @@ module red_gear()
}
}
module leaf_arm(left=true) {
module leaf_arm(left=true, h, angle=false) {
dx = 7.51;
difference() {
//cube([4,20,width+1], center=true);
@@ -142,6 +148,7 @@ module leaf_arm(left=true) {
}
}
}
cube([4,10,h], center=true);
}
module round_case_inner(meshd, shaftd, width, tol) {
@@ -172,10 +179,10 @@ module round_case(
intersection() {
hull() {
for (x = [-MeshD/2, MeshD/2] )
translate([x,0])
translate([x,0])
cylinder(d=18.5, h=width+4, center=true);
}
translate([-15,-12,-15]) cube([30,12,30]);
translate([-15,-12,-(width/2 + 3)]) cube([30,12,width+6]);
}
if (spine)
round_case_inner(meshd=MeshD, shaftd=d, width=width, tol=tol);
@@ -208,6 +215,10 @@ module round_case(
}
}
// Simple Square Box
// Lots of wasted space
// this was v1. Its ugly. Use rounded case.
module box(
d=ShaftD,
tol=.25,