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=470d3c2aea23a9c8f8fdb832d930ca3ea360e57b;hb=4e17e78ca0600fa676799adaa52fbf2ff7b47815;hpb=33635414c2e4ddcf51db1a73c63dd3ee18c480b3 diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index 470d3c2..543a53f 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -5,10 +5,17 @@ // 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 = 3; +holder_attach_near_wall = 5; holder_attach_xsz = 5; holder_ctie_width = 4.0 + 0.5; @@ -16,26 +23,10 @@ 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; +holder_corner_round = 2.0; 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 = @@ -50,7 +41,7 @@ crewpunch_shape = [ 26, [3.3, 7.2], [3.5, 13.6] ], ]; -crewpunch_shaft_max_y = 3.5; +crewpunch_shaft_max_y = 7.5; crewpunch_systematic_size_error = +0.36; @@ -58,34 +49,44 @@ 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 +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_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][0] - + 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; -crewpunch_biggest_y = - crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1]; -holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all - + max(0, -crewpunch_skew_yoff); +holder_block_min_y = punch_dy + - crewpunch_biggest_shape[1][1] - holder_attach_near_wall + + - crewpunch_systematic_size_error - holder_skewangle_yextra; -attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall); +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; +// common stuff -//jig_iters = (jig_max_len - jig_ends_extra) / jig_interval; -jig_iters=2; -echo(jig_iters); +include // objects @@ -107,115 +108,60 @@ 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][1] + holder_min_wall, - crewpunch_biggest_shape[1][1] + 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){ - // 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 OneJigCutout(){ + minkowski(){ + cube([main_slop*2, main_slop*2, 50], center=true); + PunchHolder(false); } } module JigT(){ ////toplevel - translate([0,0,jig_main_zsz]) - rotate([180,0,0]) - Jig(); + JigPrint(); } module PunchHolderT(){ ////toplevel @@ -228,10 +174,10 @@ module Demo(){ ////toplevel } 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(); } @@ -242,7 +188,7 @@ module Kit(){ ////toplevel //PunchHolder(false); //OneJig(); //Jig(); -//Demo(); +Demo(); //JigT(); //RegistrationProtrusion(); //PunchHolderT();