Posted: 3/24/2007 7:02:09 PM EDT
| I need to make a screw, but im having trouble with the threads. I know I need to use the sweep command to make a helix, but how do I get it to follow along the edge of the screw shaft? |
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You should be able to rotate the drawing so you are looking at the bottom of the shaft then select the points. There should be little boxes at the top of the screen that guide you through a function. I've done a littw work with it, but on Monday I'll talk to one of the guys that works one it daily. See if they can help ya. |
quiet you silly Mech E, after this class I will probably never need to use solidworks again  I made a helix, made a rectangle going from the shaft of the screw to the helix, and made a swept boss/base of the rectangle along the path of the helix. |
Those are SQUARE THREADS? Pfffff. F I am going to beat it with a rock when you build it. 
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You probably don't really need to do the helix screw... I did a sten gun in solidworks a couple years ago, rifling, helixed screws, everything. It was terrible, the file took ~5 or 6 minutes to open. I got to sit and wait a minute every time I made a change to a part or did anything that got solidworks to rebuild a part. Rotating the assembly view was like watching a slideshow. ETA: What's the screw for? Larger assembly or a small school assignment? |
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I'd need to check, but I think the Solidworks library screws "simulate" threading by using a revolved thread shape, so it looks like a thread, but isn't actually helixed along the screw shaft. You might want to consider doing something like that if you start running into performance issues with the helixes. It's also easier to get the thread profile correct that way. Sweeping a thread profile along the helix will give a lot of errors if the profile and helix pitch aren't exactly right. |
| i'm using the educational version of solidworks, apparently the full version has a library with a lot of premade screws and advanced tools, but i don't have it. It's fine though, I haven't run into any performance issues, and getting the threads exactly correct isn't very important for this model. |
these days if you're running into performance issues on a screw you're either running garbage for a PC or doing something completely wrong ... we're running 1000's of parts (upwards of a million once all is said and done, but our simplified configurations are running smooth as hell and are tons more complicated than a screw.
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I got a some slowdown when I put several threaded parts together in an assembly. There was many overlaps/collisions of the threads through, so that might have had something to do with it. |