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Rhino plugin BoltGen and external program BoltGenGUI (Graphical User Interface) are free programs that create accurate Metric and English machine bolts of any length. In addition, they create inside-thread-cutters (along with hex-nuts with and without threads). Generated part Names (in Properties window) allow easy identification. Alternatively, BoltGenGUI provides an easy-to-use Graphical User Interface and runs external to Rhinoceros, but uses Rhinoceros as a graphics engine.
Makes Sockethead Capscrews, Flat head Capscrews, Flat head Machine screws, Oval Heads, Pan heads, and Hex Heads, or just threads without heads if desired.
Head drives include Torx, Philips, Allen and Hex wrench.
4 bolt styles can be created: threaded, without threads (reducing file size), and each as block instances.
Program is multilingual supporting English, Spanish, German, Czech, Italian, and French.
A second command BoltGenAN (in the Rhino dropdown menu or in BoltGenGUI) is provided to make type AN Aircraft Bolts (with wire holes).
For Rapid-Prototyping in the BoltGen plugin version, an additional Menu Dropdown function is included to resize the Inside_Thread_Cutter called ThreadCutterScaler. It allows resizing the cutter (or any object center-referenced at 0,0) in the WorldXY plane to increase thread slop. Example: multiply by 1.01 to increase size, or 0.99 to reduce size, and can be repeated as necessary.
Link for download: http://mcvanaero.com/resources
Plugin version: Download, unZip, and place in Rhinoceros Plug-in Folder. In Rhino, choose Tools, Options, Plug-Ins, and Install BoltGen.
Rhino commands are BoltGen, BoltGenAN, and ThreadCutterScaler (also available from drop-down menu selections).
GUI version: Download, unZip into temporary folder, and execute setup.exe. The BoltGenGUI program may be executed from your Start menu in folder BoltGen. Program launches Rhinoceros if not already running (caution: if Rhino is launched, BoltGenGUI will also ask to close Rhinoceros upon exitting the program). Please see the Read Me.txt file in the download for more information.