X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=earring-stand.scad;h=85c28a877107edf7984bf6fe4bfd7ff8abd7a011;hp=643e0e3608146d118b136cf908a742ee0e180310;hb=80a9b9a4a16c60541ff0698ca9527aec0e966951;hpb=4d24d42f76950cb6d5724b85af8586706942794e diff --git a/earring-stand.scad b/earring-stand.scad index 643e0e3..85c28a8 100644 --- a/earring-stand.scad +++ b/earring-stand.scad @@ -1,16 +1,43 @@ // -*- C -*- +include + +front_height = 80; +front_width = 120; +front_setback = 30; +front_thick = 2.4; + +front_hex_stride = 12.5; +front_hex_dia = 9.5; + +front_hex_y_fudge = -0.65; + +front_surround_lr =3; + +back_thick = 3; +back_pillarw = 6; + +base_thick = 2.4; + eclip_inner_rad = 2.5; -eclip_gap_rad = 0.5; -eclip_prong_th = 3; +eclip_gap_rad = 0.1; +eclip_prong_th = 2.25; eclip_outer_strt = 0.5; eclip_inner_xstrt = 0.5; eclip_ult_angle = 44; eclip_base_epsilon = 0.5; +eclip_each_len = 6; +eclip_each_every = 29; + test_alpha = 10; test_main_th = 1.5; +test_eclips = 5; +test_base_th = 2.5; +test_len = eclip_each_len + eclip_each_every*(test_eclips-1); + +num_eclips = 5; // calculated @@ -19,12 +46,24 @@ include eclip_inner_strt = eclip_outer_strt + eclip_inner_xstrt; r0 = eclip_inner_rad; -r1 = r0 + eclip_inner_rad; +r1 = r0 + eclip_gap_rad; r2 = r1 + eclip_prong_th; r2e = r1 + eclip_base_epsilon; ppxl = -(r0 / sqrt(2)) + (eclip_inner_strt / sqrt(2)); +rgap = eclip_gap_rad; + +eclip_base_offset = r1; +eclip_wall_offset = -ppxl; + +eclip_ra_offset = r2 - 0.1; + +eclip_recept_height = r2; + +eclip_rhs_offset = ppxl + rgap + eclip_prong_th; +// does not include main_th + $fn=70; module EclipLPlanCore(alpha){ @@ -43,6 +82,16 @@ module EclipLPlanCore(alpha){ } } +module EclipRPlan(alpha, main_th){ + intersection(){ + rotate(alpha) + translate([ppxl + main_th + rgap, -r2*2]) + square([eclip_prong_th, r2*(2 + 1/sqrt(2))]); + translate([-r2, -r2e]) + square([r2*3, eclip_base_epsilon + r2*4]); + } +} + module EclipLPlan(alpha){ rotate(alpha) EclipLPlanCore(alpha); } @@ -59,5 +108,238 @@ module EclipPPlan(main_th){ translate([ppxl, 0]) square([main_th, r2]); } -color("red") EclipLPlan(test_alpha); -color("blue") rotate(test_alpha) EclipPPlan(test_main_th); +module TestBase(){ ////toplevel + translate([0,0, eclip_base_offset]){ + for (i=[1 : 2: test_eclips-2]) { + translate([0, i*eclip_each_every]) + rotate([90,0,0]) + linear_extrude(height=eclip_each_len) + EclipLPlan(test_alpha); + } + for (j=[0 : 2: test_eclips-1]) { + translate([0, j*eclip_each_every]) + rotate([90,0,0]) + linear_extrude(height=eclip_each_len) + EclipRPlan(test_alpha, test_main_th); + } + } + translate([-r2, -eclip_each_len, -test_base_th]){ + difference(){ + cube([r2*2, + test_len, + test_base_th]); + mirror([0,0,1]) Commitid_BestCount_M([r2*2, test_len]); + } + } +} + +module TestProtr(){ ////toplevel + difference(){ + translate([0,0, test_main_th - eclip_wall_offset]) + rotate([0,90,0]) + linear_extrude(height=test_len) + EclipPPlan(test_main_th); + mirror([0,0,1]) Commitid_BestCount_M([test_len, r2]); + } +} + +module TestRAProtr(){ ////toplevel + rotate([-90,0,0]) TestProtr(); + mirror([1,0,0]) + translate([-test_len, + -r2, + -(eclip_ra_offset + test_base_th)]) + cube([test_len, + r2*2, + test_base_th]); +} + +module TestPlanDemo(){ + color("red") EclipLPlan(test_alpha); + color("blue") rotate(test_alpha) EclipPPlan(test_main_th); + color("green") EclipRPlan(test_alpha, test_main_th); +} + +beta = asin(front_setback / front_height); + +uf = [-sin(beta), cos(beta)]; +ur = [ -uf[1], uf[0]]; + +pp = [0, 0]; +pq = pp + uf*front_height + ur*eclip_ra_offset; +pr = [ pq[0] - eclip_base_offset - eclip_wall_offset, + 0 ]; + +echo("uf ur P Q R", uf, ur, pp, pq, pr); + +module Sketch(){ + polygon([pq, pp, pr]); +} + +thicks = [ base_thick, front_thick, back_thick ]; + +module Joins(alpha, objnum, objnum_f, objnum_m) { + pitch = (front_width - eclip_each_len) / (num_eclips-1); + + thm = thicks[objnum_m]; + stride = (front_width - eclip_each_len) / (num_eclips-1); + + if (objnum==objnum_f) { + for (i=[ 1 : 2 : num_eclips-1 ]) { + translate([0, i*stride + eclip_each_len, 0]) { + rotate([90,0,0]) + linear_extrude(height=eclip_each_len) + EclipLPlan(alpha); + } + } + for (i=[ 0 : 2 : num_eclips-1 ]) { + translate([0, i*stride + eclip_each_len, 0]) { + rotate([90,0,0]) + linear_extrude(height=eclip_each_len) + EclipRPlan(alpha, thm); + } + } + } + if (objnum==objnum_m) + mirror([0,1,0]) + rotate([90,0,0]) + linear_extrude(height=front_width) + rotate(alpha) + EclipPPlan(thm); +} + +function r3(pc) = [ pc[0], 0, pc[1] ]; + +module ObjectJoins(objnum){ + translate(r3(pp)) Joins(beta, objnum, 0,1); + translate(r3(pr)) mirror([1,0,0]) Joins(0, objnum, 0,2); + translate(r3(pq)) rotate([0,90,0]) mirror([1,0,0]) Joins(-beta, objnum, 2,1); +} + +module Base(){ + xmin = pr[0] - eclip_rhs_offset - thicks[2]; + xmax = pp[0] + eclip_rhs_offset + thicks[1] + + eclip_prong_th * (1/cos(beta) - 1) + + eclip_base_offset * tan(beta); + intersection(){ + ObjectJoins(0); + translate([xmin, + -1, + -50]) + cube([xmax - xmin, + front_width + 2, + 300]); + } + translate([xmin, + 0, + -eclip_base_offset - thicks[0]]){ + difference(){ + cube([xmax - xmin, + front_width, + thicks[0]]); + translate([xmax-xmin, front_width]/2) + rotate([0,0,270]) + Commitid_Full16_M(); + } + } +} + +module FrontPattern(){ + totalh = front_height - eclip_wall_offset + thicks[1]; + + ystride = front_hex_stride; + xstride = front_hex_stride * cos(30) * 2; + + difference(){ + square([front_width, totalh]); + translate([ front_surround_lr, + eclip_recept_height ]) + square([ front_width - front_surround_lr*2, + totalh - eclip_recept_height*2 + ]); + } + + difference(){ + square([front_width, totalh]); + for (xi=[ -5 : 5 ]) { + translate([front_width/2 + + xi * xstride, + 0]) { + for (yi=[ 0 : 10 ]) { + //echo(yi); + translate([0, yi * ystride + + front_hex_dia*front_hex_y_fudge]) { + for (dv=[ [0,0], + [-xstride/2, -ystride/2] + ]) + translate(dv) + circle(r= front_hex_dia/2, $fn=6); + } + } + } + } + } +} + +module Front(){ + ObjectJoins(1); + rotate([0, 90-beta, 0]) + translate([0, 0, ppxl]) + rotate([0,0,90]) { + linear_extrude(height=thicks[1]) + FrontPattern(); + } +} + +module Back(){ + ObjectJoins(2); + + zmin = pr[1]; + zmax = pq[1] + eclip_prong_th; + height = zmax - zmin; + + translate([pr[0] + eclip_wall_offset - thicks[2], + 0, 0]) + rotate([0,90,0]) + rotate([0,0,90]) { + difference(){ + cube([front_width, + height, + thicks[2]]); + translate([back_pillarw, + eclip_recept_height, + -10]) + cube([front_width - back_pillarw*2, + height - eclip_recept_height*2 - eclip_prong_th, + 20]); + } + } +} + +module BackPrint(){ ////toplevel + rotate([0,-90,0]) Back(); +} + +module FrontPrint(){ ////toplevel + rotate([0, 90+beta, 0]) Front(); +} + +module BasePrint(){ ////toplevel + Base(); +} + +module Demo(){ ////toplevel + color("red") Base(); + color("blue") Front(); + color("black") Back(); +} + +//PlanDemo(); +//TestBase(); +//TestProtr(); +//TestRAProtr(); +//Sketch(); +//Demo(); +//BackPrint(); +//FrontPrint(); +//BasePrint();