X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=poster-tube-lid.scad;h=ba3fc60ec41d6e444037b67593abf35c63fd36db;hb=70df0ba7e5e7bcaec72a4adf1e36ad2195d9ffff;hp=c96c86b91d5b389f4dd452055b397858e8f3ec0c;hpb=252b19d5baba62e2238c5ef19a6725001923f94e;p=reprap-play.git diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad index c96c86b..ba3fc60 100644 --- a/poster-tube-lid.scad +++ b/poster-tube-lid.scad @@ -1,6 +1,6 @@ // -*- C -*- -main_dia = 71.2 + 0.50; +main_dia = 71.2 + 0.50 - 2.26; top_thick = 4; main_cnr = 4.0; @@ -10,41 +10,240 @@ rivet_thick = 1.67; rivet_width = 4.15 + 1.0; rivet_tall = 5.51 + 0.49; -over_rivet = 0.5; +over_rivet_wall = 0.5; +side_rivet_gap = 1.5; bayo_interf = 0.75; bayo_behind = 3.5; +bayo_interf_width = 2.0; +bayo_interf_slope = 0.75; -seal_thick = 0.1; -seal_pocket = 2.0; +oring_thick = 5.0; +oring_bore = 62.0; + +oring_upper_embed_angle = 45; +oring_compress = 0.1; // proportion side_taper = 1.0; +bayo_above_gap = 1.0; + +bayo_entry = bayo_behind/3; + +bayo_slice_size = 1; + +brace_hole_width = 1.0; +brace_above_below = 1.2; + +jig_thick = 1.4; +jig_hole_dia = 3.0; +jig_rim = 5; +jig_mark = 5; + // calculated -side_height = rivet_posn + bayo_behind; -side_thick = rivet_tall + over_rivet; +bayo_entry_x = bayo_entry; +bayo_entry_z = bayo_entry; +bayo_inramp_x = bayo_entry; +bayo_inramp_z = bayo_entry; + +oring_mid_dia = oring_bore + oring_thick; +oring_outer_dia = oring_mid_dia + oring_thick; + +oring_oblate = (1 - oring_compress); + +oring_y_rad = oring_thick/2 * oring_oblate; +oring_x_rad = oring_thick/2 / oring_oblate; + +seal_thick = oring_y_rad * (1 + cos(oring_upper_embed_angle)); + +side_height = rivet_posn + bayo_behind + rivet_thick/2; +side_thick = rivet_tall + over_rivet_wall; top_z = top_thick + seal_thick; +bayo_entry = bayo_behind / 3.0; +bayo_top_z = bayo_behind + rivet_thick + bayo_above_gap; +bayo_entry_ramp = bayo_entry + bayo_interf; + +rivet_entry_width = rivet_width + side_rivet_gap; + +jig_mark_rad = jig_mark + main_dia/2 + jig_thick; + $fs=0.5; -$fa=5; +$fa=1; + +// bayonet definition + +bayo_a = [ bayo_entry_x, 0 ]; +bayo_p = [ 0, bayo_entry_z ]; +bayo_n = [ 0, bayo_behind-bayo_inramp_z ]; +bayo_m = [ bayo_inramp_x, bayo_behind ]; +bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope, 1 ]; +bayo_k = bayo_l + [ bayo_interf_width, 0 ]; +bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ]; +bayo_i = bayo_j + [ rivet_width, 0 ]; +bayo_h = [ bayo_i[0], bayo_behind + rivet_thick + bayo_above_gap ]; +bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ]; + +bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0]; +bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0]; +bayo_c = bayo_d + [0,-5]; +bayo_b = bayo_a + [0,-5]; + +bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ]; + +bayo_polygon = [ bayo_a, + bayo_b, + bayo_c, + bayo_d, + bayo_e, + bayo_f, + bayo_g, + bayo_h, + bayo_i, + bayo_j, + bayo_k, + bayo_l, + bayo_m, + bayo_n, + bayo_p ]; + +echo(bayo_polygon); module MainProfile(){ main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr; - translate(main_cnr_pos){ + difference(){ + union(){ + translate(main_cnr_pos){ + intersection(){ + difference(){ + circle(r = main_cnr); + circle(r = main_cnr * 0.5); + } + square([10,10]); + } + } + polygon([[ -11, seal_thick ], + [ -11, top_z ], + [ main_cnr_pos[0], top_z ], + [ side_thick, main_cnr_pos[1] ], + [ side_thick, -side_height ], + [ side_taper, -side_height ], + [ 0, -rivet_posn ], + [ 0, seal_thick ], + ], + convexity=10); + } + } +} + +module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){ + // nom_rad > real_rad + rotate([0,0, atan2(offset, nom_rad) ]){ intersection(){ - difference(){ - circle(r = main_cnr); - circle(r = main_cnr * 0.5); + translate([-offset, -10, 0]) + rotate([90,0,0]) + linear_extrude(height= nom_rad*2) + children(0); + translate([0,0, -25]) + cylinder(h=50, r= real_rad); + translate([0,0, -25]) + linear_extrude(height= 50) + polygon([ [ 0,0 ], + [ -slice_size, -real_rad*2 ], + [ +slice_size, -real_rad*2 ] ]); + } + } +} + +module RotateProject(x_min, x_max, slice_size, nom_rad, real_rad){ + offs = [ for (i=[ x_min : + slice_size : + x_max + slice_size ]) i ]; + echo (offs); + for (off=offs) + RotateProjectSlice(off, slice_size, nom_rad, real_rad) + children(0); +} + +module BayonetCutout(){ + RotateProject(bayo_c[0], bayo_i[0], bayo_slice_size, + main_dia/2 + side_thick, + main_dia/2 + rivet_tall) + polygon(bayo_polygon, convexity=10); +} + +module ProfilesDemo(){ ////toplevel + translate([-20,0]) MainProfile(); + polygon(bayo_polygon, convexity=10); +} + +module Cover(){ ////toplevel + render() difference(){ + union(){ + rotate_extrude(convexity=10) + translate([main_dia/2, 0]) + MainProfile(); + translate([0,0, seal_thick]) + cylinder(h= top_thick, r = main_dia/2 - 10); + } + for (r=[0,180]) + rotate([0,0, r]) + translate([0,0, -side_height]) + BayonetCutout(); + for (r=[0 : 60 : 179]) { + rotate([0,0, r]) { + height = top_thick - brace_above_below*2; + translate([0,0, seal_thick + brace_above_below + height/2 ]) + cube(center=true, [ main_dia, brace_hole_width, height ]); + } + } + } +} + +module SavingHole(){ + translate([0,0, -10]) + cylinder(r= main_dia/2 - jig_rim, h=20); +} + +module Jig(){ ////toplevel + difference(){ + union(){ + translate([0,0, -side_height]){ + cylinder(r= main_dia/2 + jig_thick, h= side_height + jig_thick); } - square([10,10]); + translate([-jig_mark_rad, 0, jig_thick - jig_mark]) + cube([jig_mark_rad*2, jig_mark, jig_mark]); } + translate([0,0, -side_height-1]) + cylinder(r= main_dia/2, h= side_height + 1); + SavingHole(); + translate([0,0, -rivet_posn]) + rotate([90, 0,0]) + translate([0,0, -100]) + cylinder(r= jig_hole_dia/2, h = 200); + } +} + +module CoverTest2(){ ////toplevel + difference(){ + Cover(); + SavingHole(); + } +} + +module CoverTest1(){ ////toplevel + difference(){ + CoverTest2(); + translate([0,0, -10]) + cube([ main_dia*3, main_dia * .85, 20], center=true); } - %polygon([[ -1, seal_thick ], - [ -1, top_z ], - [ main_cnr_pos[0], top_z ], - [ side_thick, main_cnr_pos[1] ]]); } -MainProfile(); +//ProfilesDemo(); +//BayonetCutout(); +//MainProfile(); +//Cover(); +//Jig(); +//CoverTest();