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Hi All, I wrote this software for a CAD application called CorelCAD and I know it works on Graebert's ARES Commander as well, and it should work on Autocad and other LISP based systems, but I'd appreciate it if anyone could check. Maybe most CAD packages come with something like this now? I don't know, but I do know it's a novel way to calculate threads, with very high accuracy, and that conform to ISO standards for thread faces. There are two routines, NUT and BOLT. Bolt calculates external threads, and Nut internal ones. It's not very well written, but it seems bug-free and works well enough. It may require interactivity when it completes it's two "LOFT" commands, but on CorelCAD I use the defaults and just hit enter. Hopefully it might help others who need to create threads. The routines are optimised for 3D printing application, and allow offset on internal threads to allow appropriate clearances, though you can manually set the clearance for external threads by choosing a smaller diameter. When run, it will ask for basepoint, diameter, pitch and indexes ( starts ) - and can create multi-start threads for optical purposes and such. Or perhaps even specialist helical gears. It also creates all threads in the direction of the Z axis. I haven't included reverse gears - but a 3D mirror will create one. The application takes a unique approach to thread creation, generating a longitudinal cross-section in 32 segments and then using LOFT to join them together. It creates each bolt in two halves ( to avoid loft-related issues with torroids ) and them union's them together. It cleans up the final solid part, by masking off at a length and filling in the inside. External threads are created solid and complete, and internal threads are subtracted from another solid. This approach also allows bottoming threads to be easily inserted into solids. Well, I hope you like it It's my first post. I came here some time ago looking for an easy way to make threads, and on not finding one, I wrote my own. I hope it attaches OK isothreads v0.12A.lsp Regards David