1-Visitor
August 31, 2011
Question
Summary-screw threads
- August 31, 2011
- 9 replies
- 16295 views
Thanks to all who responded. All good stuff. I'll probably start off with ending my sweep profile with either an angle or curve as suggested below, but will also try some of the other suggestions, and take a look at the videos from Art.
A thanks also to Joe for offering up some examples (Joe, I'll let you know if I need any).
Stefan
1. Don't add the thread as a protrusion - cut the thread into the major OD.
2. You can create screw threads for standard screws. Or you can go to www.mcmaster.com<">http://www.mcmaster.com> and download any number of formats of standard screws.
Neal
3. It looks like your threads are protruded rather than a cut, correct? Taper your sweep profile into the part. In the thread form sketch, be sure to not be using a centerline & reference the form on that minor dia I see in the part. If you have a centerline, the feature will fail because you can't run the thread out if you have conflicting constraints I could send you examples or even model it for you but I am in WF4.
4. Somebody may have already said but you can change the profile of the sweep trajectory to give the run out at the start of the thread. Instead of a straight line you add a slope at the end or even an arc.
5. Sometimes it helps to do the thread sweep as a surface then construct the end details in surfaces and merge them before solidifying the thread. As others have said you can get standard screws with thread if you look and mostly it is not necessary or even desirable. That said sometimes it is required in which case i have used the methods outlined above with good success.
6. I think a key issue is, it appears you are doing a helical sweep, when what you need
is a helical CUT. Much more likely to get what you want that way.
7. Create the OD, with a chamfer down to whatever the spigot diameter is, then simply cut from the spigot end.
8. A couple of videos that may help?
This thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.
A thanks also to Joe for offering up some examples (Joe, I'll let you know if I need any).
Stefan
1. Don't add the thread as a protrusion - cut the thread into the major OD.
2. You can create screw threads for standard screws. Or you can go to www.mcmaster.com<">http://www.mcmaster.com> and download any number of formats of standard screws.
Neal
3. It looks like your threads are protruded rather than a cut, correct? Taper your sweep profile into the part. In the thread form sketch, be sure to not be using a centerline & reference the form on that minor dia I see in the part. If you have a centerline, the feature will fail because you can't run the thread out if you have conflicting constraints I could send you examples or even model it for you but I am in WF4.
4. Somebody may have already said but you can change the profile of the sweep trajectory to give the run out at the start of the thread. Instead of a straight line you add a slope at the end or even an arc.
5. Sometimes it helps to do the thread sweep as a surface then construct the end details in surfaces and merge them before solidifying the thread. As others have said you can get standard screws with thread if you look and mostly it is not necessary or even desirable. That said sometimes it is required in which case i have used the methods outlined above with good success.
6. I think a key issue is, it appears you are doing a helical sweep, when what you need
is a helical CUT. Much more likely to get what you want that way.
7. Create the OD, with a chamfer down to whatever the spigot diameter is, then simply cut from the spigot end.
8. A couple of videos that may help?
This thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.