discpick-tensioner.scad: Improved tensioning component with longer prongs.

[scad] / discpick-collar.scad

diff --git a/discpick-collar.scad b/discpick-collar.scad
index 87d3c46..0497b63 100644 (file)
--- a/discpick-collar.scad
+++ b/discpick-collar.scad
@@ -1,31 +1,80 @@
-MM = 1;
+/* -*-c-*-
+ *
+ * A spacer for the Sparrows disc-detainer picking tool
+ *
+ * (c) 2022 Mark Wooding
+ */
 
-CUT_WD = 10*MM;
-BORE_DIAM = 6*MM;
-SPACER_HT = 7.25*MM;
-HEIGHT = SPACER_HT + 3*MM;
-THICK = 16*MM;
-WIDTH = 18*MM;
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 
-BIG = 20*MM;
+/*----- Configuration -----------------------------------------------------*/
+
+/* Overall scaling. */
+MM = 1;
 
+/* Curvature quality. */
 $fa = 0.1;
 $fs = 0.2*MM;
 
+/* A `large enough' length; effectively infinite. */
+BIG = 20*MM;
+
+/* Dimensions. */
+CUT_WD = 10*MM;                                /* width of the cut in the top */
+BORE_DIAM = 6*MM;                      /* diameter of hole down the mid */
+SPACER_HT = 7.25*MM;                   /* height of the offset */
+HEIGHT = SPACER_HT + 3*MM;             /* overall ht, including shelves */
+THICK = 16*MM;                         /* thickness */
+WIDTH = 18*MM;                         /* width */
+
+/*----- The main object ---------------------------------------------------*/
 
 difference() {
   intersection() {
+
+    /* Start with a bounding parallelepiped.  We're going to shave pieces of
+     * this to make the actual object.
+     */
     translate([-WIDTH/2, -THICK/2, 0])
       cube([WIDTH, THICK, HEIGHT]);
+
+    /* Round off the vertical edges. */
     cylinder(h = HEIGHT, r = norm([CUT_WD/2, WIDTH/2]));
+
+    /* Round off the shelves that sit around the pick body. */
     rotate([0, 90, 0])
       translate([0, 0, -BIG/2])
       cylinder(h = BIG, r = norm([HEIGHT, CUT_WD/2]));
   }
+
   union() {
+
+    /* Cut out the channel in which the pick body sits, leaving the shelves
+     * on either side.
+     */
     translate([-BIG/2, -CUT_WD/2, SPACER_HT])
       cube([BIG, CUT_WD, BIG]);
+
+    /* Bore the hole down the middle through which the tensioning prongs and
+     * pick fit.
+     */
     translate([0, 0, -BIG/3])
       cylinder(h = BIG, r = BORE_DIAM/2);
   }
 }
+
+/*----- That's all, folks -------------------------------------------------*/