Metric Threads - Coarse / Fine / Super-Fine Pitches

README.rst

@@ -27,17 +27,17 @@ inside the ranges allowed by the norms.
 Usage
 ===========================
 
-To create a bolt (without head) with 10 turns of G1-inch thread:
+To create a bolt (without head) with 10 turns of M12 thread:
 
 .. code-block:: OpenSCAD
 
-        bolt("G1", turns=10);
+        bolt("M12x0.5", turns=10);
 
 A nut:
 
 .. code-block:: OpenSCAD
 
-        nut("G1", turns=10, Douter=40);
+        nut("M12x0.5", turns=10, Douter=40);
 
 Note that for a nut you also have to specify an outer diameter. The inner
 diameter is implicitly given by the thread designator ("G1" in this case).
@@ -69,8 +69,8 @@ List of supported threads
 
 Currently, threadlib knows these threads:
 
-- British Standard Pipe Parallel Threadss G1/16 to G6
-
+- British Standard Pipe Parallel Threads G1/16 to G6
+- Metric threads (coarse, fine, and super-fine pitches) M0.25 to M600
 
 Extensibility
 ===========================
@@ -97,5 +97,6 @@ for addition to threadlib!
 Change Log
 ===========================
 
+- 0.2: Metric threads
 - 0.1: Initial release supporting BSP parallel thread
 

autogenerate.awk

@@ -2,5 +2,5 @@ BEGIN	{ FS = "," ; RS = "\n"
 	  print "/* This script is auto-generated - do not edit"
 	  print "   :License: 3-clause BSD. See LICENSE. */"
 	  printf "\nTHREAD_TABLE = [" }
-/^[GP]/	{ print "[\"" $1 "\", [" $2 ", " $3 ", " $4 ", [[" $5 ", " $6 "], [" $7 ", " $8 "], [" $9 ", " $10 "], [" $11 ", " $12 "]]]],"}
+/^[GPM]/	{ print "[\"" $1 "\", [" $2 ", " $3 ", " $4 ", [[" $5 ", " $6 "], [" $7 ", " $8 "], [" $9 ", " $10 "], [" $11 ", " $12 "]]]],"}
 END	{ print "];" }

test.scad

@@ -10,14 +10,15 @@ use <threadlib/threadlib.scad>
 
 echo ("threadlib version: ", __THREADLIB_VERSION());
 
-type = "G1";
+type = "M12x0.5";
 turns = 5;
 Douter = thread_specs(str(type, "-int"))[2] * 1.2;
 
+echo(thread_specs(str(type, "-ext")));
 intersection() {
     color("Green")
-        translate([-100, 0, -100])
-            cube(200, 200, 200);
+        translate([-1000, 0, -1000])
+            cube(2000, 2000, 2000);
     union() {
         bolt(type, turns);
         nut(type, turns, Douter);