From 9fab008d84419ee912afba2186bdbf98e2563411 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 8 Apr 2020 17:45:33 +0100
Subject: [PATCH] mic-camera-adapter: wip

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 mic-camera-adapter.scad | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/mic-camera-adapter.scad b/mic-camera-adapter.scad
index bbb2ef3..1ffc71e 100644
--- a/mic-camera-adapter.scad
+++ b/mic-camera-adapter.scad
@@ -2,4 +2,26 @@
 
 include <threads.scad>
 
-english_thread();
+inch = 25.4;
+
+positive = inch/2;
+negative = inch/2;
+midsection = 5;
+
+module Adapter(){
+  translate([0,0,-0.1])
+    english_thread(diameter = 3/8., threads_per_inch=16,
+		   leadin=1,
+		   length= (positive + 0.1) / inch);
+  rotate([180,0,0]) {
+    difference(){
+      cylinder(r=10, h=negative + midsection);
+      translate([0,0, midsection])
+	english_thread(diameter = 1/2., threads_per_inch=20,
+		       leadin=1, internal=true,
+		       length=midsection+0.1);
+    }
+  }
+}
+
+Adapter();
-- 
2.30.2