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| Copyright 2019 Adrian Schlatter | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are met: | ||
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| 1. Redistributions of source code must retain the above copyright notice, this | ||
| list of conditions and the following disclaimer. | ||
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| 2. Redistributions in binary form must reproduce the above copyright notice, | ||
| this list of conditions and the following disclaimer in the documentation | ||
| and/or other materials provided with the distribution. | ||
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| 3. Neither the name of the copyright holder nor the names of its contributors | ||
| may be used to endorse or promote products derived from this software without | ||
| specific prior written permission. | ||
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| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | ||
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
| FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| PET-Bottle Waterrocket Fins | ||
| threadlib | ||
| +++++++++++++++++++++++++++ | ||
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| This is a CAD-model of fins intended to be screwed onto a PET bottle to create a | ||
| water rocket. To create the rocket, you need: | ||
| threadlib is a library of standard threads for OpenSCAD. It is based on Helges | ||
| excellent `threadprofile.scad | ||
| <https://github.com/MisterHW/IoP-satellite/tree/master/OpenSCAD%20bottle%20threads>`__ | ||
| to create nice threads with lead-in / lead-out tapers. Check out his `article on | ||
| generating nice threads | ||
| <https://hackaday.io/page/5252-generating-nice-threads-in-openscad>`__ on | ||
| Hackaday. | ||
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| - bottle with PCO-1881 threading (e.g. a 1.5-l Coke bottle) | ||
| - this part | ||
| - Gardena tap connector G 1" | ||
| - launcher | ||
| In contrast to other thread libraries, threadlib does not make you look up | ||
| diameters and pitches and maybe even thread-profiles in tables and norms: It has | ||
| these tables built in. | ||
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| (+ water + pressurized air). | ||
| Creating a thread is as simple as | ||
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| .. code-block:: OpenSCAD | ||
| thread("G1/2-ext", turns=10, higbee_arc=20); | ||
| to create a British Standard Pipe parallel external thread. Furthermore, | ||
| threadlib allows for production tolerances by choosing thread dimensions well | ||
| inside the ranges allowed by the norms. | ||
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| Usage | ||
| =========================== | ||
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| To create a bolt (without head) with 10 turns of G1-inch thread: | ||
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| .. code-block:: OpenSCAD | ||
| bolt("G1", turns=10); | ||
| A nut: | ||
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| .. code-block:: OpenSCAD | ||
| nut("G1", 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). | ||
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| If you only need the threads alone: | ||
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| .. code-block:: OpenSCAD | ||
| thread("G2 1/2-ext", turns=5); | ||
| Then, add the support you want. In the simplest case, a cylinder (which is what | ||
| nut(...) uses): | ||
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| .. code-block:: OpenSCAD | ||
| specs = thread_specs("G2 1/2-ext"); | ||
| P = specs[0]; Rrot = specs[1]; Dsupport = specs[2]; | ||
| section_profile = specs[3]; | ||
| H = (5 + 1) * P; | ||
| translate([0, 0, -P / 2]) | ||
| cylinder(h=H, d=Dsupport, $fn=120); | ||
| Here, we have used the function thread_specs(...) to look up the threads | ||
| specifications - including the recommended diameter of the support structure. | ||
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| List of supported threads | ||
| =========================== | ||
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| Currently, threadlib knows these threads: | ||
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| - British Standard Pipe Parallel Threadss G1/16 to G6 | ||
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| Extensibility | ||
| =========================== | ||
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| Don't find some of the threads you need for your project? Don't worry: You can | ||
| add your own: | ||
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| .. code-block:: OpenSCAD | ||
| use <threadlib/threadlib.scad> | ||
| MY_THREAD_TABLE = [ | ||
| ["special", [pitch, Rrot, Dsupport, | ||
| [[r0, z0], [r1, z1], ..., [rn, zn]]]] | ||
| ]; | ||
| thread("special", turns=15, table=MY_THREAD_TABLE); | ||
| Care to share? Safe others from repeating the valuable work you have already | ||
| accomplished and get the fame you deserve: Send in your tried and tested threads | ||
| for addition to threadlib! | ||
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| Change Log | ||
| =========================== | ||
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| - 0.1: Initial release supporting BSP parallel thread | ||
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| Use at your own risk. |
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| BEGIN { print "/* This script is auto-generated - do not edit" | ||
| print " :License: 3-clause BSD. See LICENSE. */" | ||
| printf "\nTHREAD_TABLE = [" } | ||
| /^G/ { print "[\"" $1 "\", [" $2 ", " $3 ", " $4 ", [[" $5 ", " $6 "], [" $7 ", " $8 "], [" $9 ", " $10 "], [" $11 ", " $12 "]]]],"} | ||
| END { print "];" } |
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| /* | ||
| Test and demonstrate thread library | ||
| :Author: Adrian Schlatter | ||
| :Date: 2019-04-07 | ||
| :License: 3-Clause BSD. See LICENSE. | ||
| */ | ||
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| use <threadlib/threadlib.scad> | ||
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| echo ("threadlib version: ", __THREADLIB_VERSION()); | ||
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| type = "G1"; | ||
| turns = 5; | ||
| Douter = thread_specs(str(type, "-int"))[2] * 1.2; | ||
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| intersection() { | ||
| color("Green") | ||
| translate([-100, 0, -100]) | ||
| cube(200, 200, 200); | ||
| union() { | ||
| bolt(type, turns); | ||
| nut(type, turns, Douter); | ||
| }; | ||
| }; |
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| /* | ||
| threadlib | ||
| +++++++++ | ||
| Create threads easily. | ||
| :Author: Adrian Schlatter | ||
| :Date: 2019-04-07 | ||
| :License: 3-Clause BSD. See LICENSE. | ||
| */ | ||
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| function __THREADLIB_VERSION() = 0.1; | ||
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| use <thread_profile.scad> | ||
| include <THREAD_TABLE.scad> | ||
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| function thread_specs(designator, table=THREAD_TABLE) = | ||
| /* Returns thread specs of thread-type 'designator' as a vector of | ||
| [pitch, Rrotation, Dsupport, section_profile] */ | ||
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| table[search([designator], table, num_returns_per_match=1, | ||
| index_col_num=0)[0]][1]; | ||
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| module thread(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE) | ||
| { | ||
| specs = thread_specs(designator, table=table); | ||
| P = specs[0]; Rrotation = specs[1]; section_profile = specs[3]; | ||
| straight_thread( | ||
| section_profile=section_profile, | ||
| higbee_arc=higbee_arc, | ||
| r=Rrotation, | ||
| turns=turns, | ||
| pitch=P); | ||
| } | ||
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| module bolt(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE) { | ||
| union() { | ||
| specs = thread_specs(str(designator, "-ext"), table=table); | ||
| P = specs[0]; Dsupport = specs[2]; | ||
| H = (turns + 1) * P; | ||
| thread(str(designator, "-ext"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table); | ||
| translate([0, 0, -P / 2]) | ||
| cylinder(h=H, d=Dsupport, $fn=fn); | ||
| }; | ||
| }; | ||
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| module nut(designator, turns, Douter, higbee_arc=20, fn=120, table=THREAD_TABLE) { | ||
| union() { | ||
| specs = thread_specs(str(designator, "-int"), table=table); | ||
| P = specs[0]; Dsupport = specs[2]; | ||
| H = (turns + 1) * P; | ||
| rotate(180) | ||
| thread(str(designator, "-int"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table); | ||
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| translate([0, 0, -P / 2]) | ||
| difference() { | ||
| cylinder(h=H, d=Douter, $fn=fn); | ||
| translate([0, 0, -0.1]) | ||
| cylinder(h=H+0.2, d=Dsupport, $fn=fn); | ||
| }; | ||
| }; | ||
| }; |
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