compute gap for the free belt side

1 files changed, 1 insertions, 1 deletions

diff --git a/x-carriage.scad b/x-carriage.scad
index 26e54f6..ac963d5 100644
--- a/x-carriage.scad
+++ b/x-carriage.scad
@@ -43,49 +43,49 @@ module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=bel
   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();
  difference() {
   translate([-cw/2,-belt_width/2,-rods_apart/2-bearings_d/2])
   cube(size=[cw,bearings_d/2+bearings_s+belt_width/2,rods_apart+bearings_d]);
 
   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);
   }
 
   difference() {
-   gap=3;
+   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);
     /*
     pd = 4.5;	// post diameter
     bhd = 5;	// belt holder diameter
     translate([cw/2-pd/2,0,belts_apart/2-belts_thickness-bhd/2]) cube(size=[pd,belt_width,bhd],center=true);
     translate([(cw-pd)/2,0,0]) // TODO: z
     rotate([-90,0,0]) translate([0,0,-1]) cylinder(d=pd,h=belt_width+2,center=true,$fn=30); */