X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=lock-inframe-bracket.scad;h=f1505675bb1a3bf5c4efc528ce1921e53e7c0cdb;hp=64ce58c77dd6e77724cd90c2905729a64055f7a4;hb=0dd084916e997047d879b074c71b5d40a311f747;hpb=e20e39f26f3d192ac47977282c17f46a8bca186a diff --git a/lock-inframe-bracket.scad b/lock-inframe-bracket.scad index 64ce58c..f150567 100644 --- a/lock-inframe-bracket.scad +++ b/lock-inframe-bracket.scad @@ -1,18 +1,24 @@ // -*- C -*- -tube_dia = 27.5 + 1.25; +// use shell thickness 1.50 +// use fill density 40% + +include + +tube_dia = 27.5 + 1.625; lock_w = 42.5 + 0.5; lock_d = 28.0 + 0.5; main_h = 45.0; backflange_d = 12; -lockshaft_dia = 16.65; +backflange_hole_dy = -1; +lockshaft_dia = 14.35; cliprecess_h = 16; total_h = 45; -back_gap = 10; -main_th = 2.5; -tube_th = 2.25; +back_gap = 12.5; +main_th = 3.50; +tube_th = 4.00; midweb_d = 3; clip_th = 3.5; @@ -20,12 +26,31 @@ clip_gap = 2.5; clip_d = 22.0; mountscrew_dia = 4 + 0.5; -clipbolt_dia = 5 + 0.1; +clipbolt_dia = 5 + 0.6; -backflange_th = 3.5; +mountscrew_washer = 10; + +backflange_th = 4.5; $fn=50; +join_cr = 9; + +tube_rear_extra_th = 1; + +divide_shaft_w = 1.75; +divide_shaft_l = 1.5; +divide_head_dx = 1.75; +divide_head_th = 1.5; +divide_gap = 0.50; +divide_heads = 2; + +divide_angle = 26; +divide_fudge_r = 4.75; +divide_around = 3.5; + +backflange_angle = 20; + // calculated lockshaft_r = [1, 1] * lockshaft_dia / 2; @@ -33,9 +58,11 @@ front_th = main_th; tube_or = tube_dia/2 + tube_th; back_ohw = back_gap/2 + backflange_th; -backflange_ymin = tube_or+backflange_d; +backflange_ymin = tube_dia/2 + backflange_d; lock_0y = tube_dia/2 + lock_d/2 + midweb_d; +lock_0x = lock_w/2 - lock_d/2; +lock_0 = [lock_0x,lock_0y]; lock_or = [lock_w, lock_d]/2 + [front_th,front_th]; @@ -50,24 +77,128 @@ module oval(sz){ // sz[0] > sz[1] } } -module MainPlan(){ - difference(){ - union(){ - circle(r = tube_or); - translate([-back_ohw,0]) mirror([0,1]) - square([back_ohw*2, backflange_ymin]); +module JoinCircs(jr){ + // http://mathworld.wolfram.com/Circle-CircleIntersection.html + R = tube_or + join_cr; + r = lock_or[1] + join_cr; + d = dist2d( [0,0], lock_0 ); + x = (d*d - r*r + R*R) / (2*d); + y = sqrt( R*R - x*x ); + + echo(lock_0x, lock_0y, R,r, d, x,y); + + for (m=[0,1]) { + mirror([m,0]) { + rotate(atan2(lock_0y, lock_0x)) { + translate([x,-y]) + circle(r= jr); + } } - circle(r = tube_dia/2); - translate([-back_gap/2,1]) mirror([0,1]) - square([back_gap, backflange_ymin+2]); } - translate([0, lock_0y]){ +} + +module DivideHook(){ ////toplevel + w = tube_th/2; + d = divide_gap; + + translate([-1,0] * (w + d + w)){ + for (sx=[-1,+1]) + translate([-(w + w+d) * sx, 0]) circle(r= w); difference(){ - union(){ - oval(lock_or); + circle(r = 3*w + d); + circle(r = w + d); + translate([-10*w, -10*w]) square([20*w, 10*w]); + } + } +} + +module DivideCut(){ + w = tube_th/2; + d = divide_gap; + br = tube_dia/2 + tube_th; + + difference(){ + offset(r=divide_gap) DivideHook(); + DivideHook(); + translate([-2*w,0]) mirror([0,1]) square([4*w, 4*w]); + } +} + +module DivideCutB(){ + w = tube_th/2; + d = divide_gap; + br = tube_dia/2 + tube_th; + + intersection(){ + translate([br - tube_th/2,0]) { + difference(){ + circle(r=br + d); + circle(r=br); } + } + translate([-2*w, 0]) mirror([0,1]) square(4*w); + } +} + +module DivideSurround(){ + w = tube_th/2; + d = divide_gap; + + offset(r= w*2) { + hull() { + DivideCut(); + translate([-(4*w + 2*d), 8*w]) circle(r=w); + } + } +} + +module DivideInPlace(){ + rotate([0,0, -divide_angle]) + translate([ -tube_dia/2 -tube_th/2, 0]) + children(); +} + +module MainPlan(){ ////toplevel + difference(){ + union(){ + difference(){ + union(){ + hull(){ + for (t=[0, tube_rear_extra_th]) + translate([0, -t]) + circle(r = tube_or); + } + rotate([0,0, backflange_angle]) + translate([-back_ohw,0]) mirror([0,1]) + square([back_ohw*2, backflange_ymin]); + + translate([0, lock_0y]){ + oval(lock_or); + } + + hull(){ + JoinCircs(0.01); + polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]); + } + } + + rotate([0,0, backflange_angle]) + translate([-back_gap/2,1]) mirror([0,1]) + square([back_gap, backflange_ymin+2]); + + JoinCircs(join_cr); + } + + DivideInPlace() DivideSurround(); + } + translate([0, lock_0y]){ oval([lock_w/2, lock_d/2]); } + + circle(r = tube_dia/2); + + DivideInPlace() DivideCut(); + DivideInPlace() DivideCutB(); } } @@ -112,18 +243,24 @@ module ExtrudeClipElevation(extra=0){ children(0); } -module ThroughHole(r, y, z) { - translate([-50, y, z]) +module ThroughHole(r, y, z, x=-50) { + translate([x, y, z]) rotate([0, 90, 0]) cylinder(r=r, h=100, $fn=20); } -module ThroughHoles(){ +module MountingHoleCylinders(r, x=-50){ for (z=[ 1/4, 3/4 ]) { - ThroughHole( mountscrew_dia/2, - -tube_or -0.5*backflange_d, - total_h * z ); + rotate([0,0, backflange_angle]) + ThroughHole( r, + -tube_dia/2 -0.5*backflange_d + backflange_hole_dy, + total_h * z, + x); } +} + +module ThroughHoles(){ + MountingHoleCylinders(mountscrew_dia/2); ThroughHole( clipbolt_dia/2, lock_0y + lock_d/2 + clip_d/2 + front_th/2, @@ -140,14 +277,14 @@ module MainPositive(){ } } -module Bracket(){ //// toplevel +module Bracket(){ ////toplevel difference(){ MainPositive(); ThroughHoles(); } } -module TestTopEdge(){ //// toplevel +module TestTopEdge(){ ////toplevel intersection(){ translate([0,0, -total_h]) translate([0,0, 4]) @@ -157,7 +294,7 @@ module TestTopEdge(){ //// toplevel } } -module TestClipBoltHole(){ //// toplevel +module TestClipBoltHole(){ ////toplevel intersection(){ union(){ translate([0, 0, -5]) @@ -170,6 +307,19 @@ module TestClipBoltHole(){ //// toplevel } } +module Demo(){ ////toplevel + Bracket(); + color("blue") MountingHoleCylinders(mountscrew_dia/2 - 0.1); + color("black") MountingHoleCylinders(mountscrew_washer/2, + back_ohw + 0.25); +} + +module DivideDemo(){ ////toplevel + color("black") translate([0,0,-2]) MainPlan(); + color("grey") DivideInPlace() DivideHook(); + color("blue") translate([0,0,-4]) DivideInPlace() DivideCut(); +} + //MainPlan(); //ClipElevationPositive(); //ClipElevation(); @@ -179,3 +329,4 @@ module TestClipBoltHole(){ //// toplevel //TestClipBoltHole(); //Bracket(); +