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=a89a071f34c1a9d1375ede5c003f723aa8a8a48e;hp=e5b6afe1f0a5f6a077727d0ada53742cdd34ae76;hb=2800433b2a3dc1ab3b5db543e0889126a248b834;hpb=aa5361f8fe478d882a38e8974bd243abec8bf613 diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad index e5b6afe..a89a071 100644 --- a/belt-slot-cut-jig.scad +++ b/belt-slot-cut-jig.scad @@ -1,27 +1,41 @@ // -*- C -*- // todo -// attachment point move up so clears when inserted -// onejig must be deep enough for strap plus motion plus holder -// even deeper for side rails -// what about existing slot locator ? maybe not +// 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 = 3; 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; +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 = @@ -30,31 +44,50 @@ 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_shaft_max_y = 3.5; 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 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; + +holder_skewangle_yextra = holder_xsz/2 * sin(abs(crewpunch_skew_angle)); + +holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][0] + + attach_ysz + crewpunch_systematic_size_error + crewpunch_skew_yoff + + 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_wall; +holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all + + max(0, -crewpunch_skew_yoff); -attach_offset = holder_attach_xsz + holder_min_wall; +attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall); + +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 @@ -68,7 +101,7 @@ 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]); } } @@ -77,15 +110,20 @@ module CrewPunch(){ } module PunchHolder(cutouts=true){ - translate([-holder_xsz/2, - -holder_ysz + holder_min_wall + crewpunch_biggest_y/2, - 0]){ + translations=[-holder_xsz/2, + -holder_ysz + holder_min_wall + crewpunch_biggest_y/2, + 0]; + translate(translations){ difference(){ translate([0,attach_offset,0]) cube([holder_xsz, holder_ysz - attach_offset, holder_block_zsz]); 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][0] + holder_front_wall, + crewpunch_biggest_shape[1][1] + holder_front_all, -crewpunch_smallest_shape[0]]) CrewPunch(); } @@ -93,30 +131,121 @@ module PunchHolder(cutouts=true){ 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]); + holder_block_zsz + punch_travel + + holder_ctie_thick + holder_attach_roof + 1]); if (cutouts) - translate([-30, holder_attach_walls, holder_block_zsz + 0.1]) + translate([-30, + 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 + 1), + translate([-(jig_interval/2 + jig_overlap), -(strap_width/2 + edgewall_width) - attach_offset, - 0]) + -strap_thick]) cube([jig_interval + 2, strap_width + edgewall_width*2 + attach_offset, - holder_ysz]); + 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 + translate([0,0,jig_main_zsz]) + rotate([180,0,0]) + Jig(); +} + +module PunchHolderT(){ ////toplevel + PunchHolder(true); +} + +module Demo(){ ////toplevel + %PunchHolder(); + Jig(); +} + +module Kit(){ ////toplevel + rotate([0,0,-45]){ + JigT(); + translate([(jig_iters-1)*jig_interval/2, + -strap_width, + 0]) + PunchHolder(); + } +} + //CrewPunch(); //PunchHolder(); //PunchHolder(false); -OneJig(); +//OneJig(); +//Jig(); +Demo(); +//JigT(); +//RegistrationProtrusion(); +//PunchHolderT(); +//Kit();