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-rw-r--r--x-carriage.scad5
1 files changed, 3 insertions, 2 deletions
diff --git a/x-carriage.scad b/x-carriage.scad
index d567189..6dc5b67 100644
--- a/x-carriage.scad
+++ b/x-carriage.scad
@@ -1,107 +1,108 @@
1slide_tolerance = .3; 1slide_tolerance = .3;
2play_tolerance=.4; 2play_tolerance=.4;
3fit_tolerance = .25; 3fit_tolerance = .25;
4 4
5 bearings_l = 30;// LM8UU: 25 5 bearings_l = 30;// LM8UU: 25
6 bearings_d = 12;// LM8UU: 15 6 bearings_d = 12;// LM8UU: 15
7 bearings_m = 2.5;// thickness of the bearing end holder 7 bearings_m = 2.5;// thickness of the bearing end holder
8 bearings_s = 2.5;// the minimum shell between bearings and carriage front 8 bearings_s = 2.5;// the minimum shell between bearings and carriage front
9 9
10rods_apart = 45; 10rods_apart = 45;
11rod_d = 8; 11rod_d = 8;
12 12
13 mounting_holes_from_top = [// the offsets of mounting holes on the back 13 mounting_holes_from_top = [// the offsets of mounting holes on the back
14 [0, 20], [-4.5,10], [4.5,10] 14 [0, 20], [-4.5,10], [4.5,10]
15]; 15];
16mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0]; 16mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0];
17 17
18belt_tooth=0.70; 18belt_tooth=0.70;
19belt_thickness=0.75; 19belt_thickness=0.75;
20belts_thickness = belt_thickness*2+belt_tooth+0.5; 20belts_thickness = belt_thickness*2+belt_tooth+0.5;
21belt_width = 6 + slide_tolerance; 21belt_width = 6 + slide_tolerance;
22belts_apart = 12; 22belts_apart = 12;
23belt_pitch = 2; 23belt_pitch = 2;
24beltholder_chamfer = 1; 24beltholder_chamfer = 1;
25 25
26tiehole_id = bearings_d+3; 26tiehole_id = bearings_d+3;
27tiehole_od = bearings_d+10; 27tiehole_od = bearings_d+10;
28tiehole_w = 4; 28tiehole_w = 4;
29 29
30screw_d = 3; 30screw_d = 3;
31screwhead_d = 5.5; 31screwhead_d = 5.5;
32screwhead_h = 3; 32screwhead_h = 3;
33 33
34module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=belt_tooth,l=100,tolerance=0) { 34module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=belt_tooth,l=100,tolerance=0) {
35 translate([-l/2,-width/2,-thickness]) 35 translate([-l/2,-width/2,-thickness])
36 intersection() { 36 intersection() {
37 union() { 37 union() {
38 cube(size=[l,width,thickness+tolerance]); 38 cube(size=[l,width,thickness+tolerance]);
39 for(x=[0:pitch:l/2]) for(s=[-1,1]) 39 for(x=[0:pitch:l/2]) for(s=[-1,1])
40 translate([l/2+s*x,0,thickness]) 40 translate([l/2+s*x,0,thickness])
41 rotate([-90,0,0]) 41 rotate([-90,0,0])
42 cylinder(r=tooth+tolerance,h=width,$fn=6); 42 cylinder(r=tooth+tolerance,h=width,$fn=6);
43 } 43 }
44 translate([0,-1,0]) 44 translate([0,-1,0])
45 cube(size=[l,width+2,thickness+tooth+1]); 45 cube(size=[l,width+2,thickness+tooth+1]);
46 } 46 }
47} 47}
48 48
49module xcarriage() { 49module xcarriage() {
50 cw = bearings_l+2*bearings_m;// carriage width 50 cw = bearings_l+2*bearings_m;// carriage width
51 % for(mz=[0,1]) mirror([0,0,mz]) translate([0,0,-belts_apart/2]) belt(l=cw+2); 51 % for(mz=[0,1]) mirror([0,0,mz]) translate([0,0,-belts_apart/2]) belt(l=cw+2);
52 difference() { 52 difference() {
53 translate([-cw/2,-belt_width/2,-(rods_apart+bearings_d+bearings_m)/2]) 53 translate([-cw/2,-belt_width/2,-(rods_apart+bearings_d+bearings_m)/2])
54 cube(size=[cw,bearings_d/2+bearings_s+belt_width/2,rods_apart+bearings_d+bearings_m]); 54 cube(size=[cw,bearings_d/2+bearings_s+belt_width/2,rods_apart+bearings_d+bearings_m]);
55 55
56 for(sz=[-1,1]) translate([0,0,sz*rods_apart/2]) { 56 for(sz=[-1,1]) translate([0,0,sz*rods_apart/2]) {
57 rotate([0,90,0]) 57 rotate([0,90,0])
58 cylinder(d=bearings_d,h=bearings_l,center=true,$fn=60); 58 cylinder(d=bearings_d,h=bearings_l,center=true,$fn=60);
59 for(sx=[-1,1]) translate([sx*bearings_l/4,0,0]) 59 for(sx=[-1,1]) translate([sx*bearings_l/4,0,0])
60 rotate([0,90,0]) cylinder(d=bearings_d-bearings_m,h=cw+2,center=true,$fn=60);
61 translate([-cw/2-1,-belt_width,-(bearings_d-bearings_m)/2])
62 cube(size=[cw+2,belt_width,bearings_d-bearings_m]);
60 rotate([0,90,0]) difference() { 63 rotate([0,90,0]) difference() {
61 cylinder(d=tiehole_od,h=tiehole_w,center=true,$fn=60); 64 cylinder(d=tiehole_od,h=tiehole_w,center=true,$fn=60);
62 cylinder(d=tiehole_id,h=tiehole_w+2,center=true,$fn=60); 65 cylinder(d=tiehole_id,h=tiehole_w+2,center=true,$fn=60);
63 } 66 }
64 rotate([0,90,0]) cylinder(d=bearings_d-bearings_m,h=cw+2,center=true,$fn=60);
65 translate([-cw/2-1,-belt_width,-(bearings_d-bearings_m)/2]) cube(size=[cw+2,belt_width,bearings_d-bearings_m]);
66 } 67 }
67 68
68 difference() { 69 difference() {
69 gap=belts_apart/6; 70 gap=belts_apart/6;
70 translate([0,-.5,-gap/2]) 71 translate([0,-.5,-gap/2])
71 cube(size=[cw+2,belt_width+2,belts_apart+2*belt_thickness+gap],center=true); 72 cube(size=[cw+2,belt_width+2,belts_apart+2*belt_thickness+gap],center=true);
72 for(mx=[0,1]) mirror([mx,0,0]) { 73 for(mx=[0,1]) mirror([mx,0,0]) {
73 ofc = mounting_holes_apart/2+screwhead_d/2+belt_thickness+belt_tooth+play_tolerance; // offset from center 74 ofc = mounting_holes_apart/2+screwhead_d/2+belt_thickness+belt_tooth+play_tolerance; // offset from center
74 r=1; 75 r=1;
75 x0 = ofc+r; x1=cw/2-r; 76 x0 = ofc+r; x1=cw/2-r;
76 z0 = r; z1 = belts_apart/2-belt_thickness; 77 z0 = r; z1 = belts_apart/2-belt_thickness;
77 difference() { 78 difference() {
78 hull() for(x=[x0,x1]) for(z=[z0,z1]) 79 hull() for(x=[x0,x1]) for(z=[z0,z1])
79 translate([x,0,z]) 80 translate([x,0,z])
80 rotate([90,0,0]) cylinder(r=r,h=belt_width+2,center=true,$fn=30); 81 rotate([90,0,0]) cylinder(r=r,h=belt_width+2,center=true,$fn=30);
81 translate([cw/2,0,belts_apart/2]) mirror([0,0,1]) belt(width=belt_width+2,l=cw/2+2,tolerance=fit_tolerance); 82 translate([cw/2,0,belts_apart/2]) mirror([0,0,1]) belt(width=belt_width+2,l=cw/2+2,tolerance=fit_tolerance);
82 } 83 }
83 bgap = belt_thickness+belt_tooth+fit_tolerance; 84 bgap = belt_thickness+belt_tooth+fit_tolerance;
84 r1 = (belts_apart/3-bgap)/2; 85 r1 = (belts_apart/3-bgap)/2;
85 hull() for(x=[mounting_holes_apart/2,x1]) 86 hull() for(x=[mounting_holes_apart/2,x1])
86 translate([x,0,-r1-bgap]) 87 translate([x,0,-r1-bgap])
87 rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30); 88 rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30);
88 } 89 }
89 } // difference 90 } // difference
90 91
91 translate([0,0,30/*heatsink height*//2]) 92 translate([0,0,30/*heatsink height*//2])
92 for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) { 93 for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) {
93 rotate([90,0,0]) cylinder(d=screw_d+2*play_tolerance,h=bearings_d+2*bearings_s+2,center=true,$fn=30); 94 rotate([90,0,0]) cylinder(d=screw_d+2*play_tolerance,h=bearings_d+2*bearings_s+2,center=true,$fn=30);
94 translate([0,belt_width/2+screwhead_h+play_tolerance,0]) 95 translate([0,belt_width/2+screwhead_h+play_tolerance,0])
95 rotate([90,0,0]) cylinder(d=screwhead_d+2*play_tolerance,h=screwhead_h+play_tolerance+1,$fn=30); 96 rotate([90,0,0]) cylinder(d=screwhead_d+2*play_tolerance,h=screwhead_h+play_tolerance+1,$fn=30);
96 } 97 }
97 ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2); 98 ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2);
98 translate([0,-belt_width/2,belts_apart/2+belt_thickness/2-fit_tolerance/2]) 99 translate([0,-belt_width/2,belts_apart/2+belt_thickness/2-fit_tolerance/2])
99 rotate([45,0,0]) cube(size=[cw+2,ccs,ccs],center=true); 100 rotate([45,0,0]) cube(size=[cw+2,ccs,ccs],center=true);
100 101
101 } // difference 102 } // difference
102} 103}
103 104
104print=false; 105print=false;
105if(print) rotate([-90,0,0]) xcarriage(); 106if(print) rotate([-90,0,0]) xcarriage();
106else xcarriage(); 107else xcarriage();
107 108