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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
$fn=50;
module main()
{
module spur()
{
linear_extrude(height=20) polygon([[-1,-1],[-1,1],[0.7,0.7],[0.7,-0.7]],[[0,1,2,3,0]]);
}
difference()
{
union()
{
//base
rotate_extrude()
{
square([9,8]);
square([10,7]);
translate([9,7]) circle(1);
}
//shaft
cylinder(r=5,h=20);
//spurs
for(i=[1:8]) rotate([0,0,i*(360/8)])
translate([5.5,0,0])spur();
}
//shaft hole
translate([0,0,-1])cylinder(r=2.5,h=22);
//captive nut and grub holes
for(j=[1:3]) rotate([0,0,j*(360/3)])
translate([0,20,4])rotate([90,0,0])
union()
{
//enterance
translate([0,-3,14.5]) cube([5.4,6,2.4],center=true);
//nut
translate([0,0,13.3]) rotate([0,0,30])cylinder(r=3.12,h=2.4,$fn=6);
//grub hole
translate([0,0,9]) cylinder(r=1.5,h=10);
}
}
}
main();
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