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tensioner-gt2-F695zz.scad
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tensioner-gt2-F695zz.scad
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// idler for two back to back F695ZZ flanged bearings
// 5*13*4
use <2020-insert.scad>
use <myLibs.scad>
bearingID= 5;
bearingOD= 13;
bearingWidth= 4*2;
bearingFlangeOD= 15;
bearingFlangeWidth= 1;
function pulley_width()= bearingWidth;
function pulley_OD_diameter()= bearingFlangeOD;
function pulley_diameter()= bearingOD;
gt2_inner_dia= 12.25;
offset_x = -20; // distance from makerslide
offset_y = 10 - (bearingOD-gt2_inner_dia); // left/right offset, to align belt with pulley
rotate_z = -90;
clearance= 2;
offset_z= 4;
block_width= abs(offset_x)+1;
block_length= 14;
belt_thick= 2; // 1.45
belt_width= 6;
belt_clearance= 2;
thick= 3*2;
function tensioner_height()= 22;
//block();
//tensioner_body();
//tensioner_support();
tensioner_695();
// generate a negative fillet for an edge
module fillet(pos= [0,0,0], radius=3, height=100, fn=16, angle= 0) {
translate(pos) rotate([0,0,angle]) translate([-radius, -radius, -height/2-0.01])
difference() {
cube([radius*2, radius*2, height+0.02]);
cylinder(r=radius, h=height+0.02, $fn=fn);
}
}
module tensioner_support() {
difference() {
union() {
// flanges
translate([0, pulley_width()/2, offset_z]) rotate([90, 0, 0]) cylinder(r=bearingFlangeOD/2, h=bearingFlangeWidth, center=false);
translate([0, -pulley_width()/2+bearingFlangeWidth, offset_z]) rotate([90, 0, 0]) cylinder(r=bearingFlangeOD/2, h=bearingFlangeWidth, center=false);
translate([0, bearingWidth/2, offset_z]) rotate([90, 0, 0]) cylinder(r=bearingOD/2, h=bearingWidth, center=false);
}
translate([0, 5, offset_z]) rotate([90, 0, 0]) cylinder(r=bearingID/2, h=10, center=false);
}
}
module block() {
rotate([0, 0, rotate_z]) translate([offset_x-(pulley_width()+thick)/2, offset_y, 0]) {
difference() {
union() {
translate([block_width/2, 0, 0]) cube([block_width, block_length, tensioner_height()], center=true);
translate([block_width/2, -block_length/2, 0]) cylinder(r=block_width/2, h=tensioner_height(), center=true, $fn=32);
// t slot
translate([0,0,-tensioner_height()/2]) rotate([0,0,-90]) slider2020(h=tensioner_height(), w=14, t=2);
}
fillet(pos=[0,block_length/2,0], radius=2, angle=90);
fillet(pos=[block_width,block_length/2,0], radius=2, angle=0);
// 1/4" hole for tensioner
#translate([7,0,10]) cylinder(r=(4)/2+0.3, h=50, center=true, $fn=12);
}
}
}
module end() {
intersection() {
cylinder(r=(pulley_width()+thick)/2, h=tensioner_height(), center=true);
translate([0, -(pulley_width()+thick)/2, 0]) cube(size=[pulley_width()+thick, pulley_width()+thick, tensioner_height()], center=true);
}
}
module tensioner_body() {
difference() {
union() {
cube([pulley_width()+thick, pulley_OD_diameter()+belt_thick+thick/2, tensioner_height()], center=true);
translate([0, -(pulley_OD_diameter()+belt_thick+thick/2)/2+0.1, 0]) end();
translate([0, (pulley_OD_diameter()+belt_thick+thick/2)/2-0.1, 0]) rotate([0, 0, 180]) end();
}
translate([0, 0, offset_z]) {
// bearing
rotate([0, 90, 0]) cylinder(r=(pulley_OD_diameter()+clearance)/2, h=pulley_width()+clearance, center=true, $fn=60);
// shaft
//#translate([-14/2,0,0]) rotate([0, 90, 0]) hole(8, 14);
}
// belt slots
translate([0, bearingOD/2+belt_thick/2, 0]) cube(size=[pulley_width()+clearance, belt_thick+belt_clearance, 40], center=true);
translate([0, -bearingOD/2-belt_thick/2, 0]) cube(size=[pulley_width()+clearance, belt_thick+belt_clearance, 40], center=true);
// clear top
translate([0, 0, tensioner_height()/2]) cube(size=[pulley_width()+clearance, pulley_OD_diameter(), 5], center=true);
}
}
module tensioner_695() {
translate([-offset_y,offset_x-(pulley_width()+thick)/2,0]) difference() {
union() {
block();
translate([0, 0, 0]) rotate([0, 0, 90]) tensioner_body();
translate([0,(pulley_width()+clearance)/2+0.01,offset_z]) horn(true);
translate([0,-(pulley_width()+clearance)/2-0.1,offset_z]) horn(false);
}
// bearing shaft
//translate([0,block_width/2,offset_z+0.5]) rotate([90, 90, 0]) slot(8, 9, 18);
#translate([0,block_width/2,offset_z]) rotate([90, 90, 0]) hole(bearingID, 19);
//translate([0, -12, 0]) cube([50, 20, 50], center=true); // cutaway to see clearance
}
%translate([-offset_y,offset_x-(pulley_width()+thick)/2,0]) tensioner_support();
// belts
%translate([-offset_y- bearingOD/2-belt_thick, offset_x-(pulley_width()+thick)/2-belt_width/2, -25]) color("gray") cube([belt_thick, belt_width, 50]);
}
module horn(front=true) {
rotate([front?90:-90, 0, 0]) cylinder(r1= bearingID/2+2.5, r2=bearingID/2+1, h=1);
}