rear_to_front_distance = 230; // rack cross rail (fam) to very front end
rear_to_cross_rail = 43.05; // bolt centre to rail centre, rail to rear
rear_bolt_to_front_bolt = 155.4;
-front_to_cross_rail = 43.05; // XXX // bolt centre to rail centre, rail to front
-front_elevation_nominal = 0;
+front_elevation_nominal = 3;
+
+cross_rail_distance = 232.09;
general_gap_y = 1.0;
rack_shear_ratio = -rear_elevation_nominal / rear_to_front_distance;
+front_to_cross_rail =
+ cross_rail_distance * sqrt(1 - rack_shear_ratio * rack_shear_ratio)
+ - rear_bolt_to_front_bolt
+ - rear_to_cross_rail;
+
brk_bolt_nut_top_y = -brk_nearbolt_recess_depth
- brk_bolt_eff_len + brk_bolt_nut_th + brk_bolt_len_slop;
}
module FamGraspElevation(){
- difference(){
- hull(){
- ybot = $rack_rail_y - rack_rail_dia/2 + grasp_large_r
- - fit_slope_len * 0.5;
- for (y = [
- ybot,
- adapt_main_top_y - grasp_large_r
- ])
- for (dx= [-1,+1] * rack_rail_dia/2)
- translate([ -$foreaftmaint_rail_z + dx, y ])
- circle(r= grasp_large_r);
- }
- translate([0, adapt_main_top_y])
- rectfromto([-500, 0], [500, 500]);
+ hull(){
+ ybot = $rack_rail_y - rack_rail_dia/2 + grasp_large_r
+ - fit_slope_len * 0.5;
+ for (y = [
+ ybot,
+ adapt_main_top_y - grasp_large_r
+ ])
+ for (dx= [/*-1,*/ +1] * rack_rail_dia/2)
+ translate([ -$foreaftmaint_rail_z + dx, y ])
+ circle(r= grasp_large_r);
+ }
+}
+
+module FamStemElevation(){
+ hull(){
+ rectfromto([ -$foreaftmaint_rail_z, adapt_main_top_y ],
+ [ 0, block_y_min]);
+ translate([
+ -$foreaftmaint_rail_z,
+ $rack_rail_y +
+ rack_shear_ratio * $foreaftmaint_rail_z * $reverse_sign,
+ ])
+ square([0.1, rack_rail_dia * 0.5], center=true);
}
}
}
FamLinextr(){
- rectfromto([ -$foreaftmaint_rail_z, adapt_main_top_y ],
- [ 0, block_y_min]);
rectfromto([ -foreaftmaint_top_block_zs[0] + bolt_z, 0 ],
[ -foreaftmaint_top_block_zs[1] + bolt_z, block_y_min] );
FamGraspElevation();
}
- RackShear()
- FamLinextr()
- FamGraspElevation();
+ intersection(){
+ union(){
+ RackShear()
+ FamLinextr()
+ FamGraspElevation();
+ FamLinextr()
+ FamStemElevation();
+ }
+ translate([ 0,
+ adapt_main_top_y - 50,
+ $foreaftmaint_rail_z ])
+ cube(center=true, 100);
+ }
}
RackShear() linextr(-10, main_sz_lhs_z+main_sz_rhs_z) {
}
}
-module RackForDemo(){ ////toplevel
+module ForRackForDemo(){
elevation = elevation_of_bolt_for(rear_to_cross_rail);
rack_rail_y = rack_rail_y_of_elevation(elevation);
rotate([-atan(rack_shear_ratio), 0,0])
- translate([0, rack_rail_y, brk_block_z/2 + rack_rail_y*rack_shear_ratio]) {
- for (m=[0]) mirror([m,0,0]) {
- linextr(-50, 50 + rear_to_cross_rail)
- translate([rack_rail_x, 0])
- circle(r= rack_rail_dia/2);
- }
- translate([0,0, rear_to_cross_rail])
- linextr_x_yz(rack_rail_x, -rack_rail_x)
+ translate([0, rack_rail_y, brk_block_z/2 + rack_rail_y*rack_shear_ratio])
+ children();
+}
+
+module RackForDemoRails(){
+ ForRackForDemo() {
+ for (m=[0]) mirror([m,0,0]) {
+ linextr(-(50 + cross_rail_distance), 50 + rear_to_cross_rail)
+ translate([rack_rail_x, 0])
circle(r= rack_rail_dia/2);
}
+ }
+}
+
+module RackForDemoCrosses(){
+ ForRackForDemo() {
+ translate([0,0, rear_to_cross_rail])
+ linextr_x_yz(rack_rail_x, -rack_rail_x)
+ circle(r= rack_rail_dia/2);
+
+ translate([0,0, rear_to_cross_rail - cross_rail_distance])
+ linextr_x_yz(rack_rail_x, -rack_rail_x)
+ circle(r= rack_rail_dia/2);
+ }
}
module Front(){ ////toplevel
module RearRackDemo(){ ////toplevel
rotate([atan(rack_shear_ratio),0,0]) SomeDemo() {
Rear();
- %RackForDemo();
+ translate([0, 0, -rear_bolt_to_front_bolt])
+ Front();
+ %RackForDemoRails();
+ %RackForDemoCrosses();
}
}