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| 00:19.06 | *** topic/#brlcad is GSoC students: if you have a question, ask and wait for an answer ... responses may take minutes or hours. Ask and WAIT. ;) |
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| 11:25.27 | DaRock | Hi guys |
| 11:25.41 | DaRock | is brlcad capable of modeling threads? |
| 11:26.21 | DaRock | I don't seem to be having much luck with any opensource cad apps |
| 11:27.06 | archivist | look for cut along a helical path |
| 11:27.36 | DaRock | heres the catch - does it actually work though? |
| 11:28.24 | DaRock | I've been trying with FreeCAD and it either crashes or the convoluted procedure fails |
| 11:28.48 | DaRock | apparently it is a hard trick to do, and openscad has issues as well |
| 11:30.05 | DaRock | ran a search on google re brlcad with non definitive results, so I'd like to be sure before running more dozens of hours chasing a goose |
| 11:32.55 | Stragus | I can't document the process, but I certainly saw models with tracks made in BRL-CAD |
| 11:33.21 | DaRock | tracks? |
| 11:33.39 | Stragus | Threads, sorry |
| 11:34.04 | DaRock | fwiw google search for brlcad cut helical path still comes up nada - first result is for solidworks (??) |
| 11:35.06 | DaRock | hmmm. Looks like another learning curve is coming then if you're sure of those tracks... threads :) |
| 11:40.49 | archivist | another solidworks type term extrude a face/sketch along a helical path |
| 11:42.16 | DaRock | another is helical sweep |
| 11:43.04 | DaRock | FreeCAD uses a helix primitive, then runs a sweep and then cuts it :) |
| 11:43.15 | DaRock | difference is just marketing ;) |
| 11:43.47 | archivist | not really as some are additive and others are cuts |
| 11:44.59 | DaRock | only depends on whether you want to cut or union - philosophical really... :) |
| 11:47.01 | DaRock | the naming is all marketing though... heaven forbid they should use a similar term! |
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| 18:24.09 | nmz787_ | DaRock: I am pretty sure you could get some parametric thread generation out of BRLCAD |
| 18:24.53 | nmz787_ | DaRock: here is an example of a helical coil: https://github.com/nmz787/python-brlcad-tcl/blob/master/examples/output/spring.stl |
| 18:24.54 | gcibot_ | [ python-brlcad-tcl/spring.stl at master · nmz787/python-brlcad-tcl · GitHub ] |
| 18:25.35 | nmz787_ | DaRock: and here is the source Python (which generates TCL, which is pushed to BRLCAD for processing): https://github.com/nmz787/python-brlcad-tcl/blob/master/examples/spring.py |
| 18:25.36 | gcibot_ | [ python-brlcad-tcl/spring.py at master · nmz787/python-brlcad-tcl · GitHub ] |
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| 18:27.05 | nmz787_ | DaRock: it is using the pipe primitive, so I think you could combine that with a subtraction from a cylinder and get a crude screw |
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| 19:23.11 | elpea | screws? I'd probably make an arb6 rotated around x, cloned with rotation and elevation incremented according to the xy width and x tilt angle (do the trigonometry if you need precision). not saying it's the best way... :-) |
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