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=cd935bd14108a6ccd1a33d9743e37a5ab999a056;hp=bd12b9cbd733859742dc368dd8d308a5fa7d749f;hb=c41c09aa5ed0cbecf95dcdd4f0271dd5196a032b;hpb=9b1636866b05a7de84045b48b8c1eabcbc4946d1 diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index bd12b9c..cd935bd 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -8,7 +8,7 @@ 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; @@ -16,6 +16,8 @@ holder_ctie_thick = 3.0 + 0.5; holder_attach_walls = 3; holder_attach_roof = 2.5; +holder_corner_round = 2.0; + jig_interval = 25; strap_width = 26.75 + 0.7; strap_thick = 3; @@ -23,7 +25,7 @@ edgewall_width = 3; punch_travel = 8; -main_slop = 0.5; +main_slop = 0.25; jig_max_len = 160; // print diagonally //jig_max_len = 30; @@ -54,31 +56,42 @@ 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 = 2.0; //degrees -crewpunch_skew_yoff = 0.6; //mm +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][1] + crewpunch_biggest_shape[2][0] + +holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] + holder_min_wall*2; -holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1] - + attach_ysz + crewpunch_systematic_size_error + crewpunch_skew_yoff - + holder_xsz/2 * sin(abs(crewpunch_skew_angle)); +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; -crewpunch_biggest_y = - crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1]; -holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all; +holder_all_min_y = holder_attach_max_y - attach_ysz; -attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall); +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; @@ -99,8 +112,8 @@ module CrewPunch(){ 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, + cube([0.1 + layer[2][xind] + ourslop, + 0.1 + layer[1][1-yind] + ourslop, 0.2]); } } @@ -108,37 +121,49 @@ 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){ - translations=[-holder_xsz/2, - -holder_ysz + holder_min_wall + crewpunch_biggest_y/2, - 0]; - translate(translations){ + 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([0,-crewpunch_skew_yoff]) - translate(-translations) rotate([0,0,-crewpunch_skew_angle]) - translate(translations) - translate([crewpunch_biggest_shape[2][0] + holder_min_wall, - crewpunch_biggest_shape[1][0] + holder_front_all, + 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 + punch_travel - + 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_all_min_y + holder_attach_walls, holder_block_zsz + punch_travel]) cube([60, holder_ctie_width, holder_ctie_thick]); } - } } module RegistrationGroove(l){ @@ -155,10 +180,10 @@ 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); @@ -214,7 +239,8 @@ module Jig(){ } module JigT(){ ////toplevel - translate([0,0,jig_main_zsz]) + rotate([0,0,-45]) + translate([0,0,jig_main_zsz]) rotate([180,0,0]) Jig(); } @@ -223,16 +249,16 @@ module PunchHolderT(){ ////toplevel PunchHolder(true); } -module Demo(){ +module Demo(){ ////toplevel %PunchHolder(); Jig(); } module Kit(){ ////toplevel + JigT(); rotate([0,0,-45]){ - JigT(); translate([(jig_iters-1)*jig_interval/2, - -strap_width, + jig_min_y - holder_max_y - 5, 0]) PunchHolder(); }