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=543a53f4d804711136c73d6a25ff79466014c0e7;hp=4ff14f1f66864431d1b166fec38884482d289e50;hb=c5b9f398993c756ff4446a2ef09c66aa8d58d662;hpb=5170ad7427d895b23ab21dec9135f29492b9e858 diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index 4ff14f1..543a53f 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -1,20 +1,31 @@ // -*- 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 + +strap_thick = 3; +strap_width = 26.75 + 0.7; + +jig_interval = 25; + +edgewall_width = 3; crewpunch_slop = 0.3; +main_slop = 0.25; holder_min_wall = 2; +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; -edgewall_width = 3; +holder_corner_round = 2.0; -main_slop = 0.5; +punch_travel = 8; // from careful measurement @@ -24,31 +35,58 @@ 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_wall = 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_wall; -attach_offset = holder_attach_xsz + holder_min_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; + +// common stuff + +include // objects @@ -62,7 +100,7 @@ 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]); } } @@ -70,47 +108,88 @@ module 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){ - translate([-holder_xsz/2, - -holder_ysz + holder_min_wall + crewpunch_biggest_y/2, - 0]){ + roundedness = cutouts ? holder_corner_round : 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]) + MaybeRoundedCube([holder_xsz, + holder_max_y - holder_block_min_y, + holder_block_zsz], + roundedness); if (cutouts) - translate([crewpunch_biggest_shape[2][1] + holder_min_wall, - crewpunch_biggest_shape[1][0] + holder_front_wall, + 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]) - cube([holder_attach_xsz, - attach_ysz, - holder_block_zsz + holder_ctie_thick + holder_attach_roof + 1]); + translate([-holder_attach_xsz/2, holder_all_min_y, 0]) + MaybeRoundedCube([holder_attach_xsz, + attach_ysz, + holder_block_zsz + punch_travel + + holder_ctie_thick + holder_attach_roof + 1], + roundedness); if (cutouts) - translate([-30, holder_attach_walls, holder_block_zsz + 0.1]) + translate([-30, + holder_all_min_y + holder_attach_walls, + holder_block_zsz + punch_travel]) cube([60, holder_ctie_width, holder_ctie_thick]); } +} + +module OneJigCutout(){ + minkowski(){ + cube([main_slop*2, main_slop*2, 50], center=true); + PunchHolder(false); } } -module OneJig(){ - difference(){ - translate([-(jig_interval/2 + 1), - -(strap_width/2 + edgewall_width) - attach_offset, +module JigT(){ ////toplevel + JigPrint(); +} + +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]) - cube([jig_interval + 2, - strap_width + edgewall_width*2 + attach_offset, - holder_ysz]); - minkowski(){ - cube([main_slop*2, main_slop*2, 50], center=true); - PunchHolder(false); - } + PunchHolder(); } } - + //CrewPunch(); //PunchHolder(); //PunchHolder(false); -OneJig(); +//OneJig(); +//Jig(); +Demo(); +//JigT(); +//RegistrationProtrusion(); +//PunchHolderT(); +//Kit();