sceejays Posted November 27, 2007 Posted November 27, 2007 i have uploaded a drawing of spiral stair rails (because the fille was to big to upload all of the drawing) i am absoloutly stumped on how to get a poly line going on top of the rails in a nice curve so i can extrude a handrail i have downloaded a helix lisp but i still can't do it any suggestions anyone many thanks sceejays SPIRAL STAIRS.for cad forum.dwg Quote
sceejays Posted November 27, 2007 Author Posted November 27, 2007 the problem im having is getting a spline or polyline to go on top of the rails in a nice curve to enable me to extrude a handrail along it so really im stumped on the first thing i have to do sceejays Quote
SLW210 Posted November 27, 2007 Posted November 27, 2007 I just snapped the SPLINE along the top at the center of each post, went around smooth, and Extruded a circle the length of the spline, using the Path option. Quote
GhostRider Posted November 27, 2007 Posted November 27, 2007 this was interesting so I thought I'd use it for an excersize, I got the Spline from the top of each post but can't get any object to extrude along the spline. I get this " Cannot extrude along 3D spline path." EDIT: Not 100% sure how I got it but had to use sweep.. COOL ! Quote
sceejays Posted November 27, 2007 Author Posted November 27, 2007 i'v managed to master getting the spline on the post many thanks to you but i cannot get a circle to extrude along it i type "sweep" at the command line but nothing happens i have also copied the spline and tried to extrude without any luck so far many thanks sceejays Quote
GE13579 Posted November 27, 2007 Posted November 27, 2007 I don't think it's SWEEP is available in 2004. From a quick interet search I found a site which might be of use to you, particulary... Yes you can make spring and threads in AutoCAD 2004 using thread.lsp & helix.lsp files... To give credit, the site I found this at was: http://www.dailyautocad.com/autocad-2007/advanced-solid-modeling-in-autocad-2007-helix-and-sweep/ Is this what you're after? Quote
GhostRider Posted November 27, 2007 Posted November 27, 2007 I couldn't find an entity that would extrude along a path, I tried many different ones, I probably wasn't doing something right I tried circles and cylinders from all angles. I'm a 3d noob though.. Quote
SLW210 Posted November 27, 2007 Posted November 27, 2007 i'v managed to master getting the spline on the post many thanks to you but i cannot get a circle to extrude along it i type "sweep" at the command line but nothing happens i have also copied the spline and tried to extrude without any luck so far many thanks sceejays Use Extrude>Path in 2004. Draw the SPLINE along the top of the posts. [ATTACH]3517[/ATTACH] Draw the CIRCLE at the end of the SPLINE. [ATTACH]3518[/ATTACH] _EXTRUDE "Select objects to extrude" select the CIRCLE and hit ENTER. Specify height of extrusion or [Direction/Path/Taper angle]: P (for Path) Select extrusion path or [Taper angle]: Select the SPLINE [ATTACH]3519[/ATTACH] Quote
GhostRider Posted November 27, 2007 Posted November 27, 2007 You made it sound so easy... I'm an idiot, I got it now... I was hitting the extrude faces Icon in the solid editing toolbar, not the "extrude" in the modeling toolbar, same Icon, it worked perfectly when I typed in the command... hope sceejays got it .... Quote
SLW210 Posted November 27, 2007 Posted November 27, 2007 You made it sound so easy... I'm an idiot, I got it now... I was hitting the extrude faces Icon in the solid editing toolbar, not the "extrude" in the modeling toolbar, same Icon, it worked perfectly when I typed in the command... hope sceejays got it .... Common mistake, I have to watch myself as I have both toolbars docked next to each other. Quote
fuccaro Posted November 28, 2007 Posted November 28, 2007 AutoCAD 2004 will not SWEEP and will not extrude along a spline. Create a 3DPOLYline -most convenient using a spiral lisp or an Excel sheet- and extrude a circle along that path. Quote
SLW210 Posted November 28, 2007 Posted November 28, 2007 AutoCAD 2004 will not SWEEP and will not extrude along a spline.Create a 3DPOLYline -most convenient using a spiral lisp or an Excel sheet- and extrude a circle along that path. I can extrude along a spline in 2000i, it is a little tricky getting the circle lined up, though. Could try using the Spline-to-pline.lsp. Quote
sceejays Posted December 3, 2007 Author Posted December 3, 2007 hi thanks for youe replies i have messed about with this project for hours i can put a spline to 3 no rails at a time and extrude thats all it will let me do if i try and do them all at once or try to extrude to 4 it won't let me but on the bright side at least i am having a certain amount of success many thanks sceejays Quote
SEANT Posted December 3, 2007 Posted December 3, 2007 AutoCAD, through 2004 anyway, will only accept a planar(flat) spline as a path for the Extrude command. Conceivably, with only 3 points, your splines are flat (that may not always be the case given off plane Tangent Vectors). The Spline to Pline lisp with resultant pline as path is an option though it will probably produce a faceted rail. Perhaps you could do the rail in segments. It is certainly more laborious, but doesn’t look to bad. SpiralRail.dwg Quote
fuccaro Posted December 3, 2007 Posted December 3, 2007 I used to generate 3DPOLY paths. Making the segments "small enough" the extrusion will be "smooth enough". Generating automatically the path it is not a problem to set the segments size as it is desired. Quote
SLW210 Posted December 3, 2007 Posted December 3, 2007 Using the Spline-to-pline.lsp I was able to do this in 2000i. Quote
zainuddin Posted December 8, 2007 Posted December 8, 2007 Hi Guy This Method Is Too Long, U Guy Have Any Easy Method Thanks Quote
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