From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 9 Oct 2017 01:00:28 +0000 (+0100)
Subject: poster-tube-lid: convert to oring: provide oring_[xy]_rad
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=12ff79d2e9cc2dc14b0e9336daad6144e4b75486;p=reprap-play.git

poster-tube-lid: convert to oring: provide oring_[xy]_rad
---

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index 830370e..33d008f 100644
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -50,8 +50,10 @@ bayo_inramp_z = bayo_entry;
 oring_mid_dia = oring_bore + oring_thick;
 oring_outer_dia = oring_mid_dia + oring_thick;
 
-seal_thick = (1 - oring_compress) * oring_thick/2
-  * (1 + cos(oring_upper_embed_angle));
+oring_y_rad = oring_thick/2 * (1 - oring_compress);
+oring_x_rad = oring_thick/2 / (1 - oring_compress);
+
+seal_thick = oring_y_rad * (1 + cos(oring_upper_embed_angle));
 
 side_height = rivet_posn + bayo_behind + rivet_thick/2;
 side_thick = rivet_tall + over_rivet_wall;