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=12ff9493ee6d8d3a50002da3ba22ea394d43cb18;hp=4001eaaebe77df1df68dc599c8973da16a13cd0f;hb=f88f593fde5c840f96c394add76fae327b7034ff;hpb=5eca8642d5af4d2d3be41785416697786209031b diff --git a/lock-inframe-bracket.scad b/lock-inframe-bracket.scad index 4001eaa..12ff949 100644 --- a/lock-inframe-bracket.scad +++ b/lock-inframe-bracket.scad @@ -1,5 +1,8 @@ // -*- C -*- +// use shell thickness 1.50 +// use fill density 40% + include tube_dia = 27.5 + 1.625; @@ -7,14 +10,15 @@ lock_w = 42.5 + 0.5; lock_d = 28.0 + 0.5; main_h = 45.0; backflange_d = 12; +backflange_hole_dy = -1; lockshaft_dia = 14.35; cliprecess_h = 16; total_h = 45; back_gap = 12.5; -main_th = 2.75; -tube_th = 2.25; +main_th = 3.50; +tube_th = 4.00; midweb_d = 3; clip_th = 3.5; @@ -22,16 +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; + +mountscrew_washer = 10; backflange_th = 4.5; $fn=50; -join_cr = 7; +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; @@ -39,7 +58,7 @@ 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; @@ -59,7 +78,7 @@ module oval(sz){ // sz[0] > sz[1] } module JoinCircs(jr){ - # http://mathworld.wolfram.com/Circle-CircleIntersection.html + // http://mathworld.wolfram.com/Circle-CircleIntersection.html R = tube_or + join_cr; r = lock_or[1] + join_cr; d = dist2d( [0,0], lock_0 ); @@ -78,36 +97,111 @@ module JoinCircs(jr){ } } -module MainPlan(){ - difference(){ - union(){ - hull(){ - for (t=[0, tube_rear_extra_th]) - translate([0, -t]) - circle(r = tube_or); +module DividePlan(xl=10){ + w = divide_shaft_w; + g = divide_gap; + l = divide_shaft_l + g; + t = divide_head_th + g; + dx = divide_head_dx; + for (m=[0,1]) mirror([m,0]) { + translate([w, 0]) square([xl, g]); + for (i=[0:divide_heads-1]) { + translate([w, i*(l + t)]) { + translate([0, 0]) square([g, l + g]); + translate([0, l]) square([divide_head_dx + g, g]); + translate([dx, l]) square([g, t + g]); + translate([0, l + t]) + square([divide_head_dx + g, g]); } - translate([-back_ohw,0]) mirror([0,1]) - square([back_ohw*2, backflange_ymin]); + } + translate([-0.1, (l + t) * divide_heads]) + square([w + g, g]); + } +} + +module DividePlanInPlace(xl=10){ + rotate([0,0, -divide_angle]) + translate([ -tube_dia/2 -tube_th/2 - divide_fudge_r, 0]) + DividePlan(xl); +} + +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(){ + 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; + + difference(){ + offset(r=divide_gap) DivideHook(); + DivideHook(); + translate([-2*w,0]) mirror([0,1]) square([4*w, 4*w]); + } +} + +module DivideInPlace(){ + rotate([0,0, -divide_angle]) + translate([ -tube_dia/2 -tube_th/2, 0]) + children(); +} - translate([0, lock_0y]){ - oval(lock_or); +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); } hull(){ - JoinCircs(0.01); - polygon([[0,0], lock_0, [-lock_0[0], lock_0[1]]]); + minkowski(){ + DividePlanInPlace(0.1); + circle(divide_around); + } } } - - circle(r = tube_dia/2); - translate([-back_gap/2,1]) mirror([0,1]) - square([back_gap, backflange_ymin+2]); - translate([0, lock_0y]){ oval([lock_w/2, lock_d/2]); } - JoinCircs(join_cr); + circle(r = tube_dia/2); + + DividePlanInPlace(); } } @@ -152,18 +246,24 @@ 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, @@ -180,14 +280,14 @@ 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]) @@ -197,7 +297,7 @@ module TestTopEdge(){ //// toplevel } } -module TestClipBoltHole(){ //// toplevel +module TestClipBoltHole(){ ////toplevel intersection(){ union(){ translate([0, 0, -5]) @@ -210,6 +310,23 @@ 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 DividePlanDemo(){ ////toplevel + DividePlan(); +} + +module DivideDemo(){ ////toplevel + color("black") translate([0,0,-2]) MainPlan(); + DivideInPlace() DivideHook(); + color("blue") translate([0,0,2]) DivideInPlace() DivideCut(); +} + //MainPlan(); //ClipElevationPositive(); //ClipElevation(); @@ -219,3 +336,4 @@ module TestClipBoltHole(){ //// toplevel //TestClipBoltHole(); //Bracket(); +