X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=belt-slot-cut-jig.scad;h=408ed235466d86196d964957ded8a278da720d6f;hp=3f59f9725d7f74255b23208b41528d9eb579ec5d;hb=b5c3f52029b2db29e620ea3f5d4ee1700e4e4d8c;hpb=6629741c34cfc7af94fb4d57d9a79679d878a9c1 diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index 3f59f97..408ed23 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -1,5 +1,227 @@ // -*- C -*- +// todo +// various registration marks +// protrustions at ends at strap width and middle +// grooves on top face at 1/4,1/2,3/4 length and 1/2 width + +crewpunch_slop = 0.3; + +holder_min_wall = 2; +holder_attach_near_wall = 3; + +holder_attach_xsz = 5; +holder_ctie_width = 4.0 + 0.5; +holder_ctie_thick = 3.0 + 0.5; +holder_attach_walls = 3; +holder_attach_roof = 2.5; + +jig_interval = 25; +strap_width = 26.75 + 0.7; +strap_thick = 3; +edgewall_width = 3; + +punch_travel = 8; + +main_slop = 0.5; + +jig_max_len = 160; // print diagonally +//jig_max_len = 30; + +registrationgroove_width = 0.8; +registrationgroove_depth = 1.2; + +registrationprotrusion_poke = 3; +registrationprotrusion_slope = 0.75; + +jig_overlap = 1; + +// from careful measurement + +crewpunch_shape = + [[ 6, [0.6, 6.0], [1.6, 12.3] ], + [ 8, [1.1, 6.2], [1.9, 12.5] ], + [ 10, [1.6, 6.5], [2.1, 12.8] ], + [ 12, [1.8, 6.6], [2.3, 12.7] ], + [ 14, [2.1, 6.8], [2.6, 13.0] ], + [ 16, [2.4, 6.9], [2.7, 13.2] ], + [ 18, [2.5, 7.0], [2.9, 13.3] ], + [ 22, [3.1, 7.1], [3.2, 13.4] ], + [ 26, [3.3, 7.2], [3.5, 13.6] ], + ]; + +crewpunch_shaft_max_y = 7.5; + +crewpunch_systematic_size_error = +0.36; + +crewpunch_min_y = 4.7 - crewpunch_systematic_size_error; + +crewpunch_smallest_shape = crewpunch_shape[0]; +crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1]; + +// computed + +attach_ysz = holder_attach_walls*2 + holder_ctie_width; +holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1] + + attach_ysz; + +holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0]; +holder_xsz = crewpunch_biggest_shape[2][1] + crewpunch_biggest_shape[2][0] + + holder_min_wall*2; +crewpunch_biggest_y = + crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1]; +holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all; + +attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall); + +jig_main_zsz = holder_block_zsz + punch_travel; + +jig_ends_extra = 2; + +//jig_iters = (jig_max_len - jig_ends_extra) / jig_interval; +jig_iters=2; +echo(jig_iters); + +// objects + module CrewPunch(){ - + ourslop = crewpunch_slop - crewpunch_systematic_size_error; + hull(){ + for(layer=crewpunch_shape){ + translate([0,0, layer[0]]){ + for(xind=[0,1]) //translate([xind?0:1,0,0]) + for(yind=[0,1]) //translate([0,yind?0.5:0,0]) + mirror([xind?1:0,0,0]) mirror([0,yind?0:1,0]){ + translate([-0.1,-0.1,-0.1]) + cube([0.1 + layer[2][1-xind] + ourslop, + 0.1 + layer[1][yind] + ourslop, + 0.2]); + } + } + } + } +} + +module PunchHolder(cutouts=true){ + translate([-holder_xsz/2, + -holder_ysz + holder_min_wall + crewpunch_biggest_y/2, + 0]){ + difference(){ + translate([0,attach_offset,0]) + cube([holder_xsz, holder_ysz - attach_offset, holder_block_zsz]); + if (cutouts) + translate([crewpunch_biggest_shape[2][0] + holder_min_wall, + crewpunch_biggest_shape[1][0] + holder_front_all, + -crewpunch_smallest_shape[0]]) + CrewPunch(); + } + difference(){ + translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0]) + cube([holder_attach_xsz, + attach_ysz, + holder_block_zsz + punch_travel + + holder_ctie_thick + holder_attach_roof + 1]); + if (cutouts) + translate([-30, + holder_attach_walls, + holder_block_zsz + punch_travel]) + cube([60, holder_ctie_width, holder_ctie_thick]); + } + } } + +module RegistrationGroove(l){ + // runs along the +ve X axis for length l but at correct z pos + translate([0, 0, jig_main_zsz + 0.1]) { + rotate([90,0,90]) + linear_extrude(height=l) + polygon([[-registrationgroove_width/2, 0], + [ +registrationgroove_width/2, 0], + [ 0, -registrationgroove_depth ]]); + } +} + +module OneJig(){ + difference(){ + translate([-(jig_interval/2 + jig_overlap), + -(strap_width/2 + edgewall_width) - attach_offset, + -strap_thick]) + cube([jig_interval + 2, + strap_width + edgewall_width*2 + attach_offset, + jig_main_zsz + strap_thick]); + minkowski(){ + cube([main_slop*2, main_slop*2, 50], center=true); + PunchHolder(false); + } + translate([-100, -strap_width/2, -10]) + cube([200, strap_width, 10]); + translate([-100,0,0]) + RegistrationGroove(200); + for (xfrac=[-1/4,0,+1/4]) + translate([jig_interval * xfrac, -100, 0]) + rotate([0,0,90]) + RegistrationGroove(200); + } +} + +module RegistrationProtrusion(){ + // points towards the positive x axis + xsz = registrationprotrusion_poke; + ysz = registrationprotrusion_poke; + diag_sz = xsz * sqrt(2); + zsz = diag_sz / registrationprotrusion_slope; + hull(){ + translate([0, 0, 0.1]){ + linear_extrude(height=0.1) + polygon([[ 0, -ysz ], + [ xsz, 0 ], + [ 0, ysz ]]); + translate([-0.1, 0, zsz ]) + rotate([0,0,45]) + cube(0.1); + } + } +} + +module Jig(){ + for(end=[0,1]){ + for(yfrac=[-1/2, 0, 1/2]){ + translate([ end + ? jig_interval * (jig_iters - 0.5) + : -jig_interval/2, + yfrac * strap_width, + 0]) + rotate([0,0, end ? 0 : 180]) + translate([ jig_overlap, 0, 0 ]) + RegistrationProtrusion(); + } + } + for (i=[0:jig_iters-1]) { + translate([jig_interval * i, 0, 0]) + OneJig(); + } +} + +module JigT(){ ////toplevel + rotate([180,0,0]) + Jig(); +} + +module PunchHolderT(){ ////toplevel + PunchHolder(true); +} + +module Demo(){ + %PunchHolder(); + Jig(); +} + +//CrewPunch(); +//PunchHolder(); +//PunchHolder(false); +//OneJig(); +//Jig(); +//Demo(); +//JigT(); +//RegistrationProtrusion(); +//PunchHolderT();