kaan/MCAD-Library
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Add rack() module to involute_gears.

Browse source
This commit is contained in:
Rodrigo Rivas Costa 2020-03-26 11:47:29 +01:00
parent b21ef47a55
commit f6f4fd5d8d
1 changed files with 46 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

46
involute_gears.scad
View file

@ -396,6 +396,46 @@ module gear (
}
}
module rack(
number_of_teeth=15,
circular_pitch=false, diametral_pitch=false,
pressure_angle=28,
clearance=0.2,
rim_thickness=8,
rim_width=5,
flat=false)
{
if (circular_pitch==false && diametral_pitch==false)
echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");
//Convert diametrial pitch to our native circular pitch
circular_pitch = (circular_pitch!=false?circular_pitch:180/diametral_pitch);
pitch = circular_pitch / 180 * PI;
addendum = circular_pitch / 180;
dedendum = addendum + clearance;
pitch_slope = tan(pressure_angle);
linear_exturde_flat_option(flat=flat, height=rim_thickness)
union()
{
translate([0,-dedendum-rim_width/2])
square([number_of_teeth*pitch, rim_width],center=true);
p1 = pitch / 4 + pitch_slope * dedendum;
p2 = pitch / 4 - pitch_slope * addendum;
for(i=[1:number_of_teeth])
translate([pitch*(i-number_of_teeth/2-0.5),0])
polygon(points=[
[-p1,-dedendum],
[p1,-dedendum],
[p2,addendum],
[-p2,addendum]
]);
}
}
module linear_exturde_flat_option(flat =false, height = 10, center = false, convexity = 2, twist = 0)
{
if(flat==false)
@ -560,6 +600,12 @@ module test_gears()
circles=5,
hub_diameter=2*8.88888889);
translate ([-37.5,0,0])
rotate ([0,0,-90])
rack (
circular_pitch=500
);
translate ([0,0,10])
{
gear (