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=bd3bb7fd47fdf0451e9fcebdfeb5f8a7f4cb94a3;hp=f6e954c65861691c843189b6c0544f7b429cf806;hb=b4d9ed98110efeb5562b7758ca07fb3fd73189f1;hpb=12b7ef805c549c20254105ddca9541a400c31e4a diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index f6e954c..bd3bb7f 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -8,16 +8,16 @@ crewpunch_slop = 0.3; holder_min_wall = 2; -holder_attach_near_wall = 3; +holder_attach_near_wall = 5; holder_attach_xsz = 5; holder_ctie_width = 4.0 + 0.5; -holder_ctie_thick = 2.0 + 0.5; +holder_ctie_thick = 3.0 + 0.5; holder_attach_walls = 3; holder_attach_roof = 2.5; jig_interval = 25; -strap_width = 25; +strap_width = 26.75 + 0.7; strap_thick = 3; edgewall_width = 3; @@ -31,6 +31,9 @@ jig_max_len = 160; // print diagonally registrationgroove_width = 0.8; registrationgroove_depth = 1.2; +registrationprotrusion_poke = 3; +registrationprotrusion_slope = 0.75; + jig_overlap = 1; // from careful measurement @@ -41,31 +44,52 @@ 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_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][0] + crewpunch_biggest_shape[2][1] + 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); +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; @@ -87,7 +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]); } } @@ -96,20 +120,20 @@ module CrewPunch(){ } 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]); + translate([-holder_xsz/2, holder_block_min_y, 0]) + cube([holder_xsz, + holder_max_y - holder_block_min_y, + holder_block_zsz]); if (cutouts) - translate([crewpunch_biggest_shape[2][1] + holder_min_wall, - crewpunch_biggest_shape[1][0] + holder_front_all, + rotate([0,0,-crewpunch_skew_angle]) + translate([punch_dx, + punch_dy, -crewpunch_smallest_shape[0]]) CrewPunch(); } difference(){ - translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0]) + translate([-holder_attach_xsz/2, holder_all_min_y, 0]) cube([holder_attach_xsz, attach_ysz, holder_block_zsz + punch_travel @@ -120,7 +144,6 @@ module PunchHolder(cutouts=true){ holder_block_zsz + punch_travel]) cube([60, holder_ctie_width, holder_ctie_thick]); } - } } module RegistrationGroove(l){ @@ -137,10 +160,10 @@ module RegistrationGroove(l){ module OneJig(){ difference(){ translate([-(jig_interval/2 + jig_overlap), - -(strap_width/2 + edgewall_width) - attach_offset, + jig_min_y, -strap_thick]) cube([jig_interval + 2, - strap_width + edgewall_width*2 + attach_offset, + jig_max_y - jig_min_y, jig_main_zsz + strap_thick]); minkowski(){ cube([main_slop*2, main_slop*2, 50], center=true); @@ -157,7 +180,38 @@ module OneJig(){ } } +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(); @@ -165,7 +219,9 @@ module Jig(){ } module JigT(){ ////toplevel - rotate([180,0,0]) + rotate([0,0,-45]) + translate([0,0,jig_main_zsz]) + rotate([180,0,0]) Jig(); } @@ -173,11 +229,21 @@ module PunchHolderT(){ ////toplevel PunchHolder(true); } -module Demo(){ +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); @@ -185,4 +251,6 @@ module Demo(){ //Jig(); //Demo(); //JigT(); +//RegistrationProtrusion(); //PunchHolderT(); +//Kit();