X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=filamentspool.scad;h=55da1ac7324eb27a81e7bf1aae1f0eab5ddc893b;hb=35d95f0b3fd329a37da9d86e592d4769a0674f82;hp=4aae9c8e27fa0d648acee7669f6d2a9b57831122;hpb=656032c27b8b8d0a5040a50e9bd4c16866024eeb;p=reprap-play.git

diff --git a/filamentspool.scad b/filamentspool.scad
index 4aae9c8..55da1ac 100644
--- a/filamentspool.scad
+++ b/filamentspool.scad
@@ -65,7 +65,11 @@ axlepinrad = 2;
 axlepintabrad = 5;
 
 washerthick = 1.2;
+washerthinthick = 0.8;
+washerverythinthick = 0.4;
 washerrad = hubaxlerad + 7.5;
+frictionwasherarmwidth = 3;
+frictionwasherextrapush = 1.0;
 
 ratchetpawl=ratchetstep-ratchettooth-bigslop*2;
 
@@ -314,11 +318,44 @@ module Axle(){ ////toplevel
   }
 }
 
+module washer(thick){
+  difference(){
+    cylinder(h=thick, r=washerrad);
+    translate([0,0,-1]) cylinder(h=washerthick+2, r=hubaxlerad+slop);
+  }
+}
+
 module AxleWasher(){ ////toplevel
+  washer(thick=washerthick);
+}
+
+module AxleThinWasher(){ ////toplevel
+  washer(thick=washerthinthick);
+}
+
+module AxleVeryThinWasher(){ ////toplevel
+  washer(thick=washerverythinthick);
+}
+
+module AxleFrictionWasher(){ ////toplevel
   difference(){
     cylinder(h=washerthick, r=washerrad);
     translate([0,0,-1]) cylinder(h=washerthick+2, r=hubaxlerad+slop);
   }
+  frarmr = hubbigrad;
+  frarmw = frictionwasherarmwidth;
+  frarmpawlr = hublwidth;
+  frarmpawlpush = slop*4 + frictionwasherextrapush;
+  for (ang=[0,180]) rotate([0,0,ang]) {
+    translate([washerrad-1, -frarmw/2, 0])
+      cube([frarmr - washerrad + 1, frarmw, washerthick]);
+    intersection(){
+      translate([frarmr - frarmpawlr, -50, 0])
+	cube([frarmpawlr, 100, 50]);
+      rotate([0,90,0])
+	cylinder(h = 50, r = frarmpawlpush, $fn=36);
+    }
+  }
 }
 
 module TowerExtender(){ ////toplevel
@@ -338,3 +375,4 @@ module TowerExtender(){ ////toplevel
 //Axle();
 //AxleWasher();
 //AxlePin();
+//AxleFrictionWasher();