| -rw-r--r-- | x-carriage.scad | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/x-carriage.scad b/x-carriage.scad index 8a9f0d9..c2552d2 100644 --- a/x-carriage.scad +++ b/x-carriage.scad @@ -1,102 +1,107 @@ slide_tolerance = .3; play_tolerance=.4; fit_tolerance = .25; bearings_l = 30; // LM8UU: 25 bearings_d = 12; // LM8UU: 15 bearings_m = 2.5; // thickness of the bearing end holder bearings_s = 2.5; // the minimum shell between bearings and carriage front rods_apart = 45; rod_d = 8; mounting_holes_from_top = [ // the offsets of mounting holes on the back [0, 20], [-4.5,10], [4.5,10] ]; mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0]; belt_tooth=0.70; belt_thickness=0.75; belts_thickness = belt_thickness*2+belt_tooth+0.5; belt_width = 6 + slide_tolerance; belts_apart = 12; belt_pitch = 2; +beltholder_chamfer = 1; tiehole_id = bearings_d+3; tiehole_od = bearings_d+10; tiehole_w = 4; screw_d = 3; screwhead_d = 5.5; screwhead_h = 3; module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=belt_tooth,l=100,tolerance=0) { translate([-l/2,-width/2,-thickness]) intersection() { union() { cube(size=[l,width,thickness+tolerance]); for(x=[0:pitch:l/2]) for(s=[-1,1]) translate([l/2+s*x,0,thickness]) rotate([-90,0,0]) cylinder(r=tooth+tolerance,h=width,$fn=6); } translate([0,-1,0]) cube(size=[l,width+2,thickness+tooth+1]); } } module xcarriage() { cw = bearings_l+2*bearings_m; // carriage width % for(mz=[0,1]) mirror([0,0,mz]) translate([0,0,-belts_apart/2]) belt(l=cw+2); difference() { translate([-cw/2,-belt_width/2,-(rods_apart+bearings_d+bearings_m)/2]) cube(size=[cw,bearings_d/2+bearings_s+belt_width/2,rods_apart+bearings_d+bearings_m]); for(sz=[-1,1]) translate([0,0,sz*rods_apart/2]) { rotate([0,90,0]) cylinder(d=bearings_d,bearings_l,center=true,$fn=60); for(sx=[-1,1]) translate([sx*bearings_l/4,0,0]) rotate([0,90,0]) difference() { cylinder(d=tiehole_od,h=tiehole_w,center=true,$fn=60); cylinder(d=tiehole_id,h=tiehole_w+2,center=true,$fn=60); } rotate([0,90,0]) cylinder(d=bearings_d-bearings_m,h=cw+2,center=true,$fn=60); translate([-cw/2-1,-belt_width,-(bearings_d-bearings_m)/2]) cube(size=[cw+2,belt_width,bearings_d-bearings_m]); } difference() { gap=belts_apart/6; translate([0,-.5,-gap/2]) cube(size=[cw+2,belt_width+2,belts_apart+2*belt_thickness+gap],center=true); for(mx=[0,1]) mirror([mx,0,0]) { ofc = mounting_holes_apart/2+screwhead_d/2+belt_thickness+belt_tooth+play_tolerance; // offset from center r=1; x0 = ofc+r; x1=cw/2-r; z0 = r; z1 = belts_apart/2-belt_thickness; difference() { hull() for(x=[x0,x1]) for(z=[z0,z1]) translate([x,0,z]) rotate([90,0,0]) cylinder(r=r,h=belt_width+2,center=true,$fn=30); translate([cw/2,0,belts_apart/2]) mirror([0,0,1]) belt(width=belt_width+2,l=cw/2+2,tolerance=fit_tolerance); } bgap = belt_thickness+belt_tooth+fit_tolerance; r1 = (belts_apart/3-bgap)/2; hull() for(x=[mounting_holes_apart/2,x1]) translate([x,0,-r1-bgap]) rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30); } } // difference translate([0,0,30/*heatsink height*//2]) for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) { rotate([90,0,0]) cylinder(d=screw_d+2*play_tolerance,h=bearings_d+2*bearings_s+2,center=true,$fn=30); translate([0,belt_width/2+screwhead_h+play_tolerance,0]) rotate([90,0,0]) cylinder(d=screwhead_d+2*play_tolerance,h=screwhead_h+play_tolerance+1,$fn=30); } + ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2); + translate([0,-belt_width/2,belts_apart/2+belt_thickness/2-fit_tolerance/2]) + rotate([45,0,0]) cube(size=[cw+2,ccs,ccs],center=true); + } // difference } print=false; if(print) rotate([-90,0,0]) xcarriage(); else xcarriage(); |