re-org docs/

docs/img_prep/Makefile

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+os = /usr/local/bin/openscad
+opts =
+imgs = bolt-M4.png nut-M12x0.5.png nutNbolt.png thread-G1o2-ext.png thread-G1o2-ext-10turns.png flexible.png tap.png
+
+.PHONY: all
+all: $(imgs)
+
+bolt-M4.png: bolt.scad
+	$(os) $(opts) --D 'type="M4"' --D 'turns=5' --D 'higbee_arc=30' --camera=0.49,-0.26,1.55,74.6,0.0,78.9,20 --imgsize=2048,2048 -o $@ $<
+
+nut-M12x0.5.png: nut.scad
+	$(os) $(opts) --D 'type="M12x0.5"' --D 'turns=10' --D 'higbee_arc=20' --D 'Douter=16' --camera=-2.2,1.2,1.8,66,0,73,52 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+nutNbolt.png: nutNbolt.scad
+	$(os) $(opts) --camera=-0.24,1.19,4.24,83,0,326.9,40.3 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+thread-G1o2-ext-10turns.png: thread.scad
+	$(os) $(opts) --D 'type="G1/2-ext"' --D 'turns=10' --D 'higbee_arc=20' --camera=-0.7,-0.6,3.4,75,0,110,100 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+thread-G1o2-ext.png: thread.scad
+	$(os) $(opts) --D 'type="G1/2-ext"' --D 'turns=5' --D 'higbee_arc=20' --camera=-0.7,-0.6,3.4,75,0,110,57 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+flexible.png: flexible.scad
+	$(os) $(opts) --D 'type="G1/2-ext"' --D 'turns=5' --D 'higbee_arc=20' --camera=-0.7,-0.6,3.4,75,0,110,57 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+tap.png: tap.scad
+	$(os) $(opts) --D 'type="G1/2"' --D 'turns=5' --D 'higbee_arc=20' --camera=7,15.3,3.45,87,0,333,65 --imgsize=2048,2048 --projection=ortho -o $@ $<
+
+
+.PHONY: clean
+clean:
+	rm *.png

docs/img_prep/bolt.scad

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+/*
+Create nice previews for documentation
+
+:Author: Adrian Schlatter
+:Date: 2019-04-10
+:License: 3-Clause BSD. See LICENSE.
+*/
+
+use <threadlib/threadlib.scad>
+
+type = "M6";
+turns = 5;
+higbee_arc = 45;
+
+bolt(type, turns, higbee_arc=higbee_arc);

docs/img_prep/flexible.scad

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+/*
+Create nice previews for documentation
+
+:Author: Adrian Schlatter
+:Date: 2019-04-13
+:License: 3-Clause BSD. See LICENSE.
+*/
+
+use <threadlib/threadlib.scad>
+
+type = "G1/2-ext";
+turns = 5;
+higbee_arc = 20;
+
+thread(type, turns, higbee_arc=higbee_arc);
+
+specs = thread_specs(type);
+P = specs[0]; Rrot = specs[1]; Dsupport = specs[2];
+section_profile = specs[3];
+H = (turns + 1) * P;
+translate([0, 0, -P / 2])
+    cylinder(h=H, d=Dsupport, $fn=120);

docs/img_prep/nut.scad

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+/*
+Create nice previews for documentation
+
+:Author: Adrian Schlatter
+:Date: 2019-04-10
+:License: 3-Clause BSD. See LICENSE.
+*/
+
+use <threadlib/threadlib.scad>
+
+type = "M12x0.5";
+turns = 10;
+Douter = 16;
+higbee_arc = 45;
+
+nut(type, turns, Douter, higbee_arc=higbee_arc);

docs/img_prep/nutNbolt.scad

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+/*
+Create nice previews for documentation
+
+:Author: Adrian Schlatter
+:Date: 2019-04-10
+:License: 3-Clause BSD. See LICENSE.
+*/
+
+use <threadlib/threadlib.scad>
+
+type = "M6";
+turns = 6;
+higbee_arc = 45;
+
+P = thread_specs(str(type, "-ext"))[0];
+dz = (turns / 2 - 1/4) * P;
+Douter = thread_specs(str(type, "-int"))[2] * 1.5;
+
+translate([0, 0, dz])
+    rotate([0, 0, -90])
+        bolt(type, turns, higbee_arc=higbee_arc);
+intersection() {
+    nut(type, turns, Douter, higbee_arc=higbee_arc);
+    translate([-100, 0, 0])
+        cube([200, 200, 200]);
+};

docs/img_prep/tap.scad

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+use <threadlib/threadlib.scad>;
+
+tap("G1/2", 5);

docs/img_prep/thread.scad

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+/*
+Create nice previews for documentation
+
+:Author: Adrian Schlatter
+:Date: 2019-04-13
+:License: 3-Clause BSD. See LICENSE.
+*/
+
+use <threadlib/threadlib.scad>
+
+type = "G1/2-ext";
+turns = 10;
+higbee_arc = 45;
+
+thread(type, turns, higbee_arc=higbee_arc);