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=ee519071cc691a1751ddbe6d5de31cf2296d6148;hp=6c8d1536d65d98a9a5754f0314aca844fcf5d963;hb=464138e783f3d265a0f10610ea6edca527a17735;hpb=b213f2884a056b79199fd6fae2e8b4611ceeefac diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index 6c8d153..ee51907 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -1,7 +1,41 @@ // -*- 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 = 5; + +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 = @@ -10,11 +44,60 @@ crewpunch_shape = [ 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] ]]; + [ 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]; + +crewpunch_skew_angle = 3.5; //degrees +crewpunch_skew_yoff = +1.1; //mm + +// computed + +punch_dx = 0.5 * (-crewpunch_biggest_shape[2][0] + +crewpunch_biggest_shape[2][1]); +punch_dy = 0.5 * (+crewpunch_biggest_shape[1][1] + -crewpunch_biggest_shape[1][0]) + crewpunch_skew_yoff; + +attach_ysz = holder_attach_walls*2 + holder_ctie_width; + +holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0]; +holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] + + holder_min_wall*2; + +holder_skewangle_yextra = holder_xsz/2 * sin(abs(crewpunch_skew_angle)); + +holder_max_y = punch_dy + crewpunch_biggest_shape[1][0] + holder_min_wall + + crewpunch_systematic_size_error + holder_skewangle_yextra; + +holder_attach_max_y = punch_dy + - max(crewpunch_biggest_shape[1][1], crewpunch_shaft_max_y) + - crewpunch_systematic_size_error - holder_skewangle_yextra; + +holder_block_min_y = punch_dy + - crewpunch_biggest_shape[1][1] - holder_attach_near_wall + + - crewpunch_systematic_size_error - holder_skewangle_yextra; + +holder_all_min_y = holder_attach_max_y - attach_ysz; + +jig_max_y = max(holder_max_y + main_slop, strap_width/2) + edgewall_width; +jig_min_y = min(holder_all_min_y - main_slop, -strap_width/2) - edgewall_width; + +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 @@ -28,7 +111,7 @@ module CrewPunch(){ mirror([xind?1:0,0,0]) mirror([0,yind?0:1,0]){ translate([-0.1,-0.1,-0.1]) cube([0.1 + layer[2][xind] + ourslop, - 0.1 + layer[1][yind] + ourslop, + 0.1 + layer[1][1-yind] + ourslop, 0.2]); } } @@ -36,4 +119,153 @@ module CrewPunch(){ } } -CrewPunch(); +module MaybeRoundedCube(sizes, roundedness){ + if (roundedness > 0) { + translate([roundedness, roundedness, 0]){ + minkowski(){ + cube([sizes[0] - roundedness*2, + sizes[1] - roundedness*2, + sizes[2]]); + cylinder(h=0.05, r=roundedness, $fn=20); + } + } + } else { + cube(sizes); + } +} + +module PunchHolder(cutouts=true){ + difference(){ + translate([-holder_xsz/2, holder_block_min_y, 0]) + cube([holder_xsz, + holder_max_y - holder_block_min_y, + holder_block_zsz]); + if (cutouts) + rotate([0,0,-crewpunch_skew_angle]) + translate([punch_dx, + punch_dy, + -crewpunch_smallest_shape[0]]) + CrewPunch(); + } + difference(){ + translate([-holder_attach_xsz/2, holder_all_min_y, 0]) + cube([holder_attach_xsz, + attach_ysz, + holder_block_zsz + punch_travel + + holder_ctie_thick + holder_attach_roof + 1]); + if (cutouts) + translate([-30, + holder_all_min_y + 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), + jig_min_y, + -strap_thick]) + cube([jig_interval + 2, + jig_max_y - jig_min_y, + 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([0,0,-45]) + translate([0,0,jig_main_zsz]) + rotate([180,0,0]) + Jig(); +} + +module PunchHolderT(){ ////toplevel + PunchHolder(true); +} + +module Demo(){ ////toplevel + %PunchHolder(); + Jig(); +} + +module Kit(){ ////toplevel + JigT(); + rotate([0,0,-45]){ + translate([(jig_iters-1)*jig_interval/2, + jig_min_y - holder_max_y - 5, + 0]) + PunchHolder(); + } +} + +//CrewPunch(); +//PunchHolder(); +//PunchHolder(false); +//OneJig(); +//Jig(); +//Demo(); +//JigT(); +//RegistrationProtrusion(); +//PunchHolderT(); +//Kit();