foofer19 Posted June 22, 2008 Share Posted June 22, 2008 I'm trying to design an experiment that requires a gas-tight seal between a piece of rigid machined plastic (Lexan polycarbonate) and flexible (Teflon PFA) gas line. In the past, we've used a tapered pipe thread (1/8 NPT) adapter for this, however I can't find how to make a tapered threaded hole or adapter in Vectorworks 2008. Unfortunately, the manufacturer's web site doesn't contain a detailed CAD drawing for downloading, and I really need the threads to be accurate. Have I missed this feature somehow? Quote Link to comment
Guest Tomu Posted June 23, 2008 Share Posted June 23, 2008 Sorry, no. There is no tapered threaded hole (pipe thread) in VectorWorks 2008. Tom Urie Nemetschek, N.A. Quote Link to comment
Pat Stanford Posted June 24, 2008 Share Posted June 24, 2008 Tom, You are right that there is no tool in VW, but you can certainly simulate an NPT pipe thread using a sweep. I don't have time to look up the pitch and thread details right now, but you can make the positive threads and then do a subtraction to provide the threaded hole. Pat Quote Link to comment
islandmon Posted June 24, 2008 Share Posted June 24, 2008 Try using a Tapered Helix . The problem is that threads are very dimensionally specific so without an established PIO you will need experiment. Quote Link to comment
Charlie_P Posted June 26, 2008 Share Posted June 26, 2008 Using Islandmon's helix spiral idea.. Attached is 1.75 mm 5 deg taper thread with the thread form on the top left. Formed with Loft surface in birail sweep mode using NURBS created with Helix spiral command. The thread form is accurate and the dimensions are precise but I haven't tried any solids operations with it - this can show up dodgy geometry Charlie Quote Link to comment
Iain Posted April 21, 2009 Share Posted April 21, 2009 Hi Charlie, Could I ask you to describe that with a few more words. I cant replicate the result. Quote Link to comment
Charlie_P Posted May 6, 2009 Share Posted May 6, 2009 Sorry for the delay, somewhat busy. As I recall : - create the thread form from a reference source; a line drawing like the form on the top left of the posted attachment. Compose if needed and convert to nurbs. - create the path using the helix spiral command; convert that to nurbs; duplicate and displace one thread pitch - loft surface in birail sweep mode using the two spirals as the rail & the tread form as the surface. That should get you there. I'll recreate it and post the file (lost the original) at some point... Quote Link to comment
Larry B. Posted May 9, 2009 Share Posted May 9, 2009 Enclosed are (2) 1/8-27 NPT files, VW12 and VW2008, exported from VW2009. Larry Quote Link to comment
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