| 1 | // PRUSA iteration3 |
| 2 | // X end prototype |
| 3 | // GNU GPL v3 |
| 4 | // Josef Průša <iam@josefprusa.cz> and contributors |
| 5 | // http://www.reprap.org/wiki/Prusa_Mendel |
| 6 | // http://prusamendel.org |
| 7 | |
| 8 | // Also includes code from Wilson and Wilson2, (c) Marty Rice |
| 9 | // https://github.com/mjrice/wilson |
| 10 | |
| 11 | // todo: make x-end height global and make anything relying implicitly |
| 12 | // on the height of the x-end use that for positioning. |
| 13 | |
| 14 | // bearing height, strain relief (&& maybe make dependent upon the bearing diameter) |
| 15 | |
| 16 | // major issues with rev 3 |
| 17 | |
| 18 | // - motor side screw hole conflicts with switch / other rear mount is |
| 19 | // inaccessible without removing the leadscrew from the nut |
| 20 | |
| 21 | // - New idler anti-pitching ribs are too big (new idler I wasn't |
| 22 | // using is larger so the existing ones worked fine for that one...) |
| 23 | // NOTE: new idler is meant for integrated toothed idler... |
| 24 | |
| 25 | use <bushing.scad> |
| 26 | include <configuration.scad> |
| 27 | |
| 28 | pushfit_d = bushing_xy[0] * 2 + 0.25; |
| 29 | thinwall = single_wall_width * 6; // 3 perimeters |
| 30 | vertical_bushing_base_size = bushing_z[1]*2 + 2 * thinwall; |
| 31 | |
| 32 | x_box_length = 45; // TODO: auto-adjust based on bearing size? |
| 33 | |
| 34 | module vertical_bushing_base(){ |
| 35 | translate(v=[-2-vertical_bushing_base_size/4,0,x_box_height/2]) cube(size = [4+vertical_bushing_base_size/2,vertical_bushing_base_size,x_box_height], center = true); |
| 36 | cylinder(h = x_box_height, r=vertical_bushing_base_size/2, $fn = 90); |
| 37 | } |
| 38 | |
| 39 | module vertical_bushing_holes(){ |
| 40 | // FIXME: is extra cut necessary? check conf_bushing |
| 41 | bushing_cut_extra = 0.2; // padding so it's not too tight |
| 42 | translate(v=[0,0,-4]) cylinder(h = x_box_height + 3, r=bushing_z[1] + bushing_cut_extra, $fn = 60); |
| 43 | translate(v=[0,0,x_box_height-4]) cylinder(h=x_box_height,r=bushing_z[1]-1,$fn=60); |
| 44 | // TODO: is slit too wide or too low? Wilson increased width from 1 |
| 45 | // -> 2 mm, slit also might need to end 1-2mm before the base |
| 46 | #rotate(a=[0,0,-50]) translate(v=[thinwall*2 + 1,0,x_box_height/2 - 2]) cube(size = [bushing_z[2]/2, 2 ,x_box_height], center = true); |
| 47 | translate([0,0,-1]) cylinder(h=9,r1=bushing_z[1]+thinwall/2+1,r2=4,$fn=60); |
| 48 | } |
| 49 | |
| 50 | |
| 51 | module nut_trap_base () { |
| 52 | // TODO: cube doesn't line up with edge of base, cylinder is slightly asymmetrical |
| 53 | // adapt newer nut trap from prusa i3 mk3 instead of wilson2 |
| 54 | cube(size=[16,21,8],center=true); |
| 55 | translate ([2,0,0]) cylinder(h=8,r=12.5,$fn=50,center=true); |
| 56 | } |
| 57 | |
| 58 | module nut_trap () { |
| 59 | union() { |
| 60 | // center post of brass nut |
| 61 | cylinder(h=12,r=5.45,$fn=50,center=true); |
| 62 | // holes for m3 screws in brass nut |
| 63 | translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true); |
| 64 | #rotate([0,0,90]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true); |
| 65 | rotate([0,0,180]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true); |
| 66 | #rotate([0,0,270]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | // x position of edge of main block (facing frame), for attaching objects to it |
| 71 | function x_base_back() = -10 - bushing_xy[0] - x_box_width/2; |
| 72 | // y position of edge of main block facing away from x-axis |
| 73 | function x_base_outside() = vertical_bushing_base_size/2; |
| 74 | // y position of edge of main block facing toward the x-axis |
| 75 | function x_base_inside() = -x_box_length/2 - vertical_bushing_base_size/2; |
| 76 | |
| 77 | module x_end_base(){ |
| 78 | // Main block |
| 79 | translate(v=[-10 - bushing_xy[0], -x_box_length/2 + vertical_bushing_base_size/2,x_box_height/2]) cube(size = [x_box_width,x_box_length,x_box_height], center = true); |
| 80 | // Bearing holder |
| 81 | vertical_bushing_base(); |
| 82 | //Nut trap |
| 83 | translate(v=[-4+zmotor_delta_x,-17-zmotor_delta_y,4]) nut_trap_base (); |
| 84 | } |
| 85 | |
| 86 | // TODO: x translation of belt and smooth rods needs to adapt to |
| 87 | // x_end_width and motor/idler pulley position. |
| 88 | |
| 89 | module x_end_holes(){ |
| 90 | vertical_bushing_holes(); |
| 91 | // Belt hole |
| 92 | translate(v=[-1,0,0]){ |
| 93 | // Stress relief |
| 94 | translate(v=[-5.5-10+1.5,-bushing_z[1]-4,30]) cube(size = [20,1,28], center = true); |
| 95 | // Cut out for belt (this is NOT centered because the motor isn't centered) |
| 96 | x_box_offset = -x_box_length/2 + vertical_bushing_base_size/2; |
| 97 | difference(){ |
| 98 | translate(v=[-5.5-10+1.5, x_box_offset ,30]) cube(size = [10, x_box_length + 1,28], center = true); |
| 99 | |
| 100 | // Nice edges |
| 101 | translate(v=[-5.5-10+1.5,x_box_offset,30+23]) rotate([0,45,0]) cube(size = [10,x_box_length + 1,28], center = true); |
| 102 | translate(v=[-5.5-10+1.5,x_box_offset,30+23]) rotate([0,-45,0]) cube(size = [10,x_box_length + 1,28], center = true); |
| 103 | translate(v=[-5.5-10+1.5,x_box_offset,30-23]) rotate([0,45,0]) cube(size = [10,x_box_length + 1,28], center = true); |
| 104 | translate(v=[-5.5-10+1.5,x_box_offset,30-23]) rotate([0,-45,0]) cube(size = [10,x_box_length + 1,28], center = true); |
| 105 | |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | // FIXME: z rod placement isn't consistent with carriage |
| 110 | pushrod_extra_z = 2.5; |
| 111 | |
| 112 | // FIXME: confirm length of smooth rod doesn't change when x_box_length or bearing size changes |
| 113 | // should also make sure this is long enough if x-ends somehow end up larger than 50mm |
| 114 | //Bottom pushfit rod |
| 115 | #translate(v=[-15,-41.5,bushing_xy[0]+pushrod_extra_z]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50); |
| 116 | // Top pushfit rod |
| 117 | translate(v=[-15,-41.5,xaxis_rod_distance+bushing_xy[0]+pushrod_extra_z]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50); |
| 118 | |
| 119 | // Nut trap |
| 120 | translate(v=[zmotor_delta_x,-17-zmotor_delta_y,3]) rotate ([0, 0, 45]) nut_trap (); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | // Final prototype |
| 125 | module x_end_plain(){ |
| 126 | difference(){ |
| 127 | x_end_base(); |
| 128 | x_end_holes(); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | x_end_plain(); |
| 133 | |
| 134 | |
| 135 | module pushfit_rod(diameter,length){ |
| 136 | translate([0,-0.3,0]) cylinder(h = length, r=diameter/2, $fn=30); |
| 137 | translate([0,0.3,0]) cylinder(h = length, r=diameter/2, $fn=30); |
| 138 | // TODO: reintroduce teardrop holes? |
| 139 | // difference(){ |
| 140 | // translate(v=[0,-diameter/2.85,length/2]) rotate([0,0,45]) cube(size = [diameter/2,diameter/2,length], center = true); |
| 141 | // translate(v=[0,-diameter/4-diameter/2-0.4,length/2]) rotate([0,0,0]) cube(size = [diameter,diameter/2,length], center = true); |
| 142 | // } |
| 143 | |
| 144 | } |