spring compression scale

2 files changed, 35 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index 5753a68..b9d2b4c 100644
--- a/Makefile
+++ b/Makefile
@@ -11,18 +11,20 @@ default:
 	@echo "And?"
 
 clean:
 	rm -f *.stl *.gcode
 
 stl-another-%:
-	$(MAKE) another-$*-{body,body-label,lever,knob,knob-label,springpad}.stl
+	$(MAKE) another-$*-{body,body-label,body-scale,lever,knob,knob-label,springpad}.stl
 
 another-%-body.stl: another-%.scad another.scad
 	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="body"' -o "$@" "$<"
 another-%-body-label.stl: another-%.scad another.scad
 	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="body.label"' -o "$@" "$<"
+another-%-body-scale.stl: another-%.scad another.scad
+	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="body.scale"' -o "$@" "$<"
 another-%-lever.stl: another-%.scad another.scad
 	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="lever"' -o "$@" "$<"
 another-%-knob.stl: another-%.scad another.scad
 	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="knob"' -o "$@" "$<"
 another-%-knob-label.stl: another-%.scad another.scad
 	$(OPENSCAD_BIN) $(OPENSCAD_FLAGS) -D 'what="knob.label"' -o "$@" "$<"
diff --git a/another.scad b/another.scad
index fd73a61..83a4e43 100644
--- a/another.scad
+++ b/another.scad
@@ -370,16 +370,35 @@ module the_extruder(
      cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
     }//mirror
    }//translate
 
    // label
    body_label();
+   // scale
+   body_scale();
 
   }//difference
 
  }//body module
+ module body_scale() {
+  scale_thickness = 2*layer_height;
+  nscales = 5;
+  x1 = -gearbox_d/2+fsw-st_h+st_w+st_bump*2-st_bump_tip/2;
+  x0 = -gearbox_d/2+st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+st_split_w+st_split_w_tolerance+st_bump_tip/2;
+  w0 = st_split_w+st_split_w_tolerance+2*(extrusion_width+2*extrusion_width);
+  w1 = 2*(longwing-gearbox_d/2-extrusion_width);
+  translate([0,-longwing,body_h-scale_thickness])
+  difference() {
+   for(x=[x0:(x1-x0)/(nscales-1):x1]) let(w=w0+(w1-w0)*(x-x0)/(x1-x0))
+    translate([x-st_bump_tip/2,-w/2,0])
+    cube(size=[st_bump_tip,w,scale_thickness+epsilon]);
+   let(w=st_split_w+st_split_w_tolerance+extrusion_width)
+   translate([-gearbox_d/2,-w/2,-1])
+   cube(size=[fsw,w,scale_thickness+2]);
+  }
+ }
  module body_label() {
   if(body_label) {
    label=body_label;
    label_thickness=body_label_thickness;
    label_len = len(label);
    labelspace = [gearbox_d/2-mount_screwhead_d/2-min_xy_shell,longwing-(mount_screwhead_d-st_split_w-st_split_w_tolerance)/2-2*min_xy_shell];
@@ -390,27 +409,32 @@ module the_extruder(
    text(text=label,size=labelspace.x/label_len,halign="center",valign="center",font="Arial Black");
   }else sphere(d=epsilon); // to avoid makefile breakage
  }
 
  st_bump = 4*extrusion_width;
  st_bump_tip = 2*extrusion_width;
+ st_smalld = st_screw_d+st_screw_d_tolerance+min_xy_shell;
+ st_bigd = spring_d+spring_d_clearance/2;
+ st_hf = (st_bigd-st_smalld)/2;
+ st_h = max(st_hf*3,fsw-st_screw_l+st_hf);
+ st_w = sp_ch;
  module springpad() {
-  smalld=st_screw_d+st_screw_d_tolerance+min_xy_shell;
-  bigd = spring_d+spring_d_clearance/2;
-  hf = (bigd-smalld)/2;
-  h = max(hf*3,fsw-st_screw_l+hf);
+  smalld=st_smalld;
+  bigd = st_bigd;
+  hf = st_hf;
+  h = st_h;
   translate([-gearbox_d/2+fsw-h,-longwing,filament_elevation])
   rotate([0,90,0]) difference() {
    union() {
     cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
     translate([0,0,hf-epsilon])
     cylinder(d=bigd,h=h-hf,$fn=fnd*bigd);
     translate([0,0,h])
     sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
     l = body_h-ls_z;
-    w = sp_ch;
+    w = st_w;
     translate([0,-st_split_w/2,0]) mirror([1,0,0]) {
      hull()  {
       translate([0,0,w+st_bump])
       cube(size=[l+st_bump,st_split_w,w]);
       cube(size=[l-w,st_split_w,2*w]);
      }
@@ -495,23 +519,26 @@ module the_extruder(
 
  mirrorleft()
  debug()
  if(what=="lever") color("green",0.7) lever();
  else if(what=="body") color("yellow",0.7) body();
  else if(what=="body.label") color("brown",0.7) body_label();
+ else if(what=="body.scale") color("brown",0.7) body_scale();
  else if(what=="knob") color("red",0.7) knob();
  else if(what=="knob.label") color("brown",0.7) knob_label();
  else if(what=="springpad") color("blue",0.7) springpad();
  else if(what=="both") {
   color("green",0.7) lever();
   color("yellow",0.7) body();
   color("brown",0.7) body_label();
+  color("brown",0.7) body_scale();
  }else{
   color("green",0.7) lever();
   color("yellow",0.7) body();
   color("brown",0.7) body_label();
+  color("brown",0.7) body_scale();
   color("red",0.7) knob();
   color("brown",0.7) knob_label();
   color("blue",0.7) springpad();
  }
 }