~mdw / scad / blame
| Commit | Line | Data |
|---|---|---|
| 5f1872e8 MW |
1 | /* -*-c-*- |
| 2 | * | |
| 3 | * A spacer for the Sparrows disc-detainer picking tool | |
| 4 | * | |
| 5 | * (c) 2022 Mark Wooding | |
| 6 | */ | |
| bfe485ff | 7 | |
| 5f1872e8 MW |
8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * | |
| 10 | * This program is free software: you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License as published by | |
| 12 | * the Free Software Foundation; either version 3 of the License, or (at | |
| 13 | * your option) any later version. | |
| 14 | * | |
| 15 | * This program is distributed in the hope that it will be useful, but | |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 18 | * General Public License for more details. | |
| 19 | * | |
| 20 | * You should have received a copy of the GNU General Public License | |
| 21 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 22 | */ | |
| bfe485ff | 23 | |
| 5f1872e8 MW |
24 | /*----- Configuration -----------------------------------------------------*/ |
| 25 | ||
| 26 | /* Overall scaling. */ | |
| 27 | MM = 1; | |
| bfe485ff | 28 | |
| 5f1872e8 | 29 | /* Curvature quality. */ |
| bfe485ff MW |
30 | $fa = 0.1; |
| 31 | $fs = 0.2*MM; | |
| 32 | ||
| 5f1872e8 MW |
33 | /* A `large enough' length; effectively infinite. */ |
| 34 | BIG = 20*MM; | |
| 35 | ||
| 36 | /* Dimensions. */ | |
| 37 | CUT_WD = 10*MM; /* width of the cut in the top */ | |
| 38 | BORE_DIAM = 6*MM; /* diameter of hole down the mid */ | |
| 39 | SPACER_HT = 7.25*MM; /* height of the offset */ | |
| 40 | HEIGHT = SPACER_HT + 3*MM; /* overall ht, including shelves */ | |
| 41 | THICK = 16*MM; /* thickness */ | |
| 42 | WIDTH = 18*MM; /* width */ | |
| 43 | ||
| 44 | /*----- The main object ---------------------------------------------------*/ | |
| bfe485ff MW |
45 | |
| 46 | difference() { | |
| 47 | intersection() { | |
| 5f1872e8 MW |
48 | |
| 49 | /* Start with a bounding parallelepiped. We're going to shave pieces of | |
| 50 | * this to make the actual object. | |
| 51 | */ | |
| bfe485ff MW |
52 | translate([-WIDTH/2, -THICK/2, 0]) |
| 53 | cube([WIDTH, THICK, HEIGHT]); | |
| 5f1872e8 MW |
54 | |
| 55 | /* Round off the vertical edges. */ | |
| bfe485ff | 56 | cylinder(h = HEIGHT, r = norm([CUT_WD/2, WIDTH/2])); |
| 5f1872e8 MW |
57 | |
| 58 | /* Round off the shelves that sit around the pick body. */ | |
| bfe485ff MW |
59 | rotate([0, 90, 0]) |
| 60 | translate([0, 0, -BIG/2]) | |
| 61 | cylinder(h = BIG, r = norm([HEIGHT, CUT_WD/2])); | |
| 62 | } | |
| 5f1872e8 | 63 | |
| bfe485ff | 64 | union() { |
| 5f1872e8 MW |
65 | |
| 66 | /* Cut out the channel in which the pick body sits, leaving the shelves | |
| 67 | * on either side. | |
| 68 | */ | |
| bfe485ff MW |
69 | translate([-BIG/2, -CUT_WD/2, SPACER_HT]) |
| 70 | cube([BIG, CUT_WD, BIG]); | |
| 5f1872e8 MW |
71 | |
| 72 | /* Bore the hole down the middle through which the tensioning prongs and | |
| 73 | * pick fit. | |
| 74 | */ | |
| bfe485ff MW |
75 | translate([0, 0, -BIG/3]) |
| 76 | cylinder(h = BIG, r = BORE_DIAM/2); | |
| 77 | } | |
| 78 | } | |
| 5f1872e8 MW |
79 | |
| 80 | /*----- That's all, folks -------------------------------------------------*/ |