-rw-r--r-- | x-carriage.scad | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/x-carriage.scad b/x-carriage.scad index c2552d2..d567189 100644 --- a/x-carriage.scad +++ b/x-carriage.scad | |||
@@ -1,107 +1,107 @@ | |||
1 | slide_tolerance = .3; | 1 | slide_tolerance = .3; |
2 | play_tolerance=.4; | 2 | play_tolerance=.4; |
3 | fit_tolerance = .25; | 3 | fit_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 | ||
10 | rods_apart = 45; | 10 | rods_apart = 45; |
11 | rod_d = 8; | 11 | rod_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 | ]; |
16 | mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0]; | 16 | mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0]; |
17 | 17 | ||
18 | belt_tooth=0.70; | 18 | belt_tooth=0.70; |
19 | belt_thickness=0.75; | 19 | belt_thickness=0.75; |
20 | belts_thickness = belt_thickness*2+belt_tooth+0.5; | 20 | belts_thickness = belt_thickness*2+belt_tooth+0.5; |
21 | belt_width = 6 + slide_tolerance; | 21 | belt_width = 6 + slide_tolerance; |
22 | belts_apart = 12; | 22 | belts_apart = 12; |
23 | belt_pitch = 2; | 23 | belt_pitch = 2; |
24 | beltholder_chamfer = 1; | 24 | beltholder_chamfer = 1; |
25 | 25 | ||
26 | tiehole_id = bearings_d+3; | 26 | tiehole_id = bearings_d+3; |
27 | tiehole_od = bearings_d+10; | 27 | tiehole_od = bearings_d+10; |
28 | tiehole_w = 4; | 28 | tiehole_w = 4; |
29 | 29 | ||
30 | screw_d = 3; | 30 | screw_d = 3; |
31 | screwhead_d = 5.5; | 31 | screwhead_d = 5.5; |
32 | screwhead_h = 3; | 32 | screwhead_h = 3; |
33 | 33 | ||
34 | module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=belt_tooth,l=100,tolerance=0) { | 34 | module 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 | ||
49 | module xcarriage() { | 49 | module 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,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]) difference() { | 60 | rotate([0,90,0]) difference() { |
61 | cylinder(d=tiehole_od,h=tiehole_w,center=true,$fn=60); | 61 | cylinder(d=tiehole_od,h=tiehole_w,center=true,$fn=60); |
62 | cylinder(d=tiehole_id,h=tiehole_w+2,center=true,$fn=60); | 62 | cylinder(d=tiehole_id,h=tiehole_w+2,center=true,$fn=60); |
63 | } | 63 | } |
64 | rotate([0,90,0]) cylinder(d=bearings_d-bearings_m,h=cw+2,center=true,$fn=60); | 64 | rotate([0,90,0]) cylinder(d=bearings_d-bearings_m,h=cw+2,center=true,$fn=60); |
65 | translate([-cw/2-1,-belt_width,-(bearings_d-bearings_m)/2]) cube(size=[cw+2,belt_width,bearings_d-bearings_m]); | 65 | translate([-cw/2-1,-belt_width,-(bearings_d-bearings_m)/2]) cube(size=[cw+2,belt_width,bearings_d-bearings_m]); |
66 | } | 66 | } |
67 | 67 | ||
68 | difference() { | 68 | difference() { |
69 | gap=belts_apart/6; | 69 | gap=belts_apart/6; |
70 | translate([0,-.5,-gap/2]) | 70 | translate([0,-.5,-gap/2]) |
71 | cube(size=[cw+2,belt_width+2,belts_apart+2*belt_thickness+gap],center=true); | 71 | cube(size=[cw+2,belt_width+2,belts_apart+2*belt_thickness+gap],center=true); |
72 | for(mx=[0,1]) mirror([mx,0,0]) { | 72 | 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 | 73 | ofc = mounting_holes_apart/2+screwhead_d/2+belt_thickness+belt_tooth+play_tolerance; // offset from center |
74 | r=1; | 74 | r=1; |
75 | x0 = ofc+r; x1=cw/2-r; | 75 | x0 = ofc+r; x1=cw/2-r; |
76 | z0 = r; z1 = belts_apart/2-belt_thickness; | 76 | z0 = r; z1 = belts_apart/2-belt_thickness; |
77 | difference() { | 77 | difference() { |
78 | hull() for(x=[x0,x1]) for(z=[z0,z1]) | 78 | hull() for(x=[x0,x1]) for(z=[z0,z1]) |
79 | translate([x,0,z]) | 79 | translate([x,0,z]) |
80 | rotate([90,0,0]) cylinder(r=r,h=belt_width+2,center=true,$fn=30); | 80 | rotate([90,0,0]) cylinder(r=r,h=belt_width+2,center=true,$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); | 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 | } | 82 | } |
83 | bgap = belt_thickness+belt_tooth+fit_tolerance; | 83 | bgap = belt_thickness+belt_tooth+fit_tolerance; |
84 | r1 = (belts_apart/3-bgap)/2; | 84 | r1 = (belts_apart/3-bgap)/2; |
85 | hull() for(x=[mounting_holes_apart/2,x1]) | 85 | hull() for(x=[mounting_holes_apart/2,x1]) |
86 | translate([x,0,-r1-bgap]) | 86 | translate([x,0,-r1-bgap]) |
87 | rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30); | 87 | rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30); |
88 | } | 88 | } |
89 | } // difference | 89 | } // difference |
90 | 90 | ||
91 | translate([0,0,30/*heatsink height*//2]) | 91 | translate([0,0,30/*heatsink height*//2]) |
92 | for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) { | 92 | 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,$fn=30); | 93 | rotate([90,0,0]) cylinder(d=screw_d+2*play_tolerance,h=bearings_d+2*bearings_s+2,center=true,$fn=30); |
94 | translate([0,belt_width/2+screwhead_h+play_tolerance,0]) | 94 | 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,$fn=30); | 95 | rotate([90,0,0]) cylinder(d=screwhead_d+2*play_tolerance,h=screwhead_h+play_tolerance+1,$fn=30); |
96 | } | 96 | } |
97 | ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2); | 97 | ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2); |
98 | translate([0,-belt_width/2,belts_apart/2+belt_thickness/2-fit_tolerance/2]) | 98 | 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); | 99 | rotate([45,0,0]) cube(size=[cw+2,ccs,ccs],center=true); |
100 | 100 | ||
101 | } // difference | 101 | } // difference |
102 | } | 102 | } |
103 | 103 | ||
104 | print=false; | 104 | print=false; |
105 | if(print) rotate([-90,0,0]) xcarriage(); | 105 | if(print) rotate([-90,0,0]) xcarriage(); |
106 | else xcarriage(); | 106 | else xcarriage(); |
107 | 107 | ||