hread_related_programs.html Thread Related Programs
The index of the programs placed in my AutoCad 2002/MySupport_Custom folder.
cad_tutor/spiral_or_helix.html CADTutor: View topic -Spiral/Helix
Informed me of the existance of an alturnative to the original R12 spiral.lsp or 3Dspiral.lsp (solid modelling and possibly 2.5D rather than 3D as it was refered to as a '2D' solution). The alturnative was the namely "a helix one" ('3D' surface modelling) and led me to search the net for a "helix.lsp" (the name I assumed it would be).
Provided a link to an excellently laid out lisp download page (for spiral.lisp) provide by an AutoCad dealer CRC. Well worth checking that site out. Also is link to a Russian site as well as AutoDesk. The spiral.lsp inthis folder is from AutoDesk. Provides a link to another thread discussion which is good. and a Scottish training site that looked good.
cad_tutor/trng_lisps/trng_lisps.html
Pics of the output expected from 4 teaching lisps included in one file, trng.txt (includes viewable link to the file). Also has recommendations for beginners on how to load lisps other than by the command line.
Screw Threads How to Model Screw with AutoCAD (If You Must).
CadDigest Article by Jim Patrick. Good statment of the problem with lots of pics. Details the solutions available (from his perspective) and gives good insights into representing threads in normal 2D, 2Disometric drawing and simplified (rotated zig-zags) 3D moelling. Obviously does not lean toward making the better realistic 3D threads because of system load. Gives some of the mechanics of drawing a realistic thread and concludes by saying the AutoCAD users at Burris Optical wrote the procedure into a lisp (not very helpful). No offered downloads.
3DSPIRAL.txt This is spiral.lsp offered as download by CadDigest. It is provided as a .txt file and only needs to be sput into the support folder or whatever but with the extension changed to .lsp.
Note: It appears identical in every respect to the spiral.lsp's referenced in the CadTutor discussion above and downloadeable variously from Autodesk amd www.cadresources.com (CRC) for example. The executive is 'spiral' still although cspiral for interactive appears to have been changed to '3dspiral'. There may be some code change. Have to look at it line by line.
Terry Rawlins and friends THREAD.LSP (modified from TPI to Pitch). Creates 3D solid (ACIS) threads. Originally written in 1998 by Jim Fitzgerald.
pitch_thread/threadR14A2000.lsp (Download 6kb not zipped) The lisp in this file is a version produced jointly by a number of people including Terry Rawlings who converted it from TPI to Pitch. It is intended for ACIS solids.
pitch_thread/threadR14A2000.txt On-line viewable text version. Change .txt to .lsp if you decide to use it rather than download the .lsp file above.
helix/cadalyst/cadalyst_helix.html Draw 3D Screw Threads By Tony Hotchkiss
Good. Uses HELIX.LSP (by Tony Hotchkiss) to creates wire frame helical screw threads for 3D drawings in AutoCad. Mentions MDT has a built in solution. Lots of screen shots (including MDT dialog box and screen shot of MDT output).
Code provided within article but also link to Catalyst download site (you have to go through a tedious registration but it's worth it).
Note: The article also tells you in detail how to place the lisp and how to load and run one which is treated as assumed knowledge in the other links.
The missing spiral.lsp (3D version) that does what the ealier 2D spiral.lisp does along with 3D. Found on McNeel's www.mcneel.com and renamed 3dspiral.lsp. Was an AutoDesk download until the PointA website was Changed.
mcneelcom/3dspiral.lsp The lisp for down load unzipped.
mcneelcom/3dspiral.txt Text for on line viewing. change extension to .lsp if you decide to use it.
Terry Rawlins and friends THREAD.LSP (modified from TPI to Pitch). Creates 3D solid (ACIS) threads. Originally written in 1998 by Jim Fitzgerald.
pitch_thread/threadR14A2000.lsp (Download 6kb not zipped) The lisp in this file is a version produced jointly by a number of people including Terry Rawlings who converted it from TPI to Pitch. It is intended for ACIS solids.
pitch_thread/threadR14A2000.txt On-line viewable text version. Change .txt to .lsp if you decide to use it rather than download the .lsp file above.
caddigest_lisp_user_trng.html CadDigest AutoLisp user training by Bill Fane.
Useful overview of autolisp, short code examples and instruction on how to load and run your own or downloaded lisps. Includes introductory creation of your own menus, custom support folders, file paths and more. Intended for the complete beginner but some useful tips for the more experienced.
Displaying Plastic Closures My need for threads.
The requirement was to model a part where the thread needed to be emphasised. This is in contrast to a modeller's traditional need to minimise load on the system and not waste time with elaborate threads. I discoverered I could not easily do a decent realistic thread when required to and that I had to look into it.