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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Yeah... I hate that about SW Basic Motion.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I'm far from an expert with this - but funny enough am having to put together motion study right now. I turned on the SolidWorks Motion add-in and it all works. You have to SolidWorks Premium or better to have Motion. I hope that helps.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
That's too bad, I'm only running Standard. I actually thought that Premium was only necessary it you want to use motion analysis. I also figured SolidWorks would have dissabled the tab and buttons if it wasn't an included feature. Maybe not. I think I've waisted too much time trying to get a ball to drop into a box anyway:)
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Basic Motion is part of core SW. SW Motion is part of Premium. Both are physic based solvers as compared to Animation motion studies which is a key frame solver.
Just saying that you can't get Basic Motion to work does not provide enough information for anyone to help you, so you need to provide the model you are working with so we can see what is going on. When you change from Animation to either Basic Motion or SW Motion, you have to change your way of thinking as you are going from a non-physic based study to a physics based study so things that are perfectly logical in one, make no sense in the other. There are also setup changes between BM and SM, as one example BM can only solve standard mates while SM solves most mate types.
When a non-physics based study has solution problems, it is more times than not a conflict between parameters. When a phyics based solver has a problem, there are way more things to look at. In my experience, BM has had problems solving some things I thought simple while at other times actually solved things I thought way beyond its capability. Just remember that BM is made to create a physics based animation, not an analysis, so the solver is very coarse when compared to SM.
So, upload your model and let us have a look.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
How about this: Using Basic Motion, try making a simple mecahanism of a cam moving a lifter, with the lifter held in contact to the cam by gravity and the cam, turning with a constant speed motor. Get this to work, and we can talk.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Ok, no problem. Attached is a cam with a follower. There are three motion studies included, one using Animation, one using Basic Motion and one using SW Motion.
The question for you is why are you using Basic Motion? You only create motion studies for two reasons, to create an analysis or to create an animation. If you are doing analysis, then you use SW Motion, so I'm assuming you are trying to create an animation. There is no reason to use Basic Motion for a follower, just use a cam mate. Basic Motion uses a very coarse solver, and contact resolution is not as good as it is in SW Motion, so it sometimes misses interaction when there is a high closure rate but is OK for constant contact.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Hello Mr. jim
I have just posted a query regarding wiper animation & i am continue user of this forum & always read your comments please reply me i hope you will solve my query.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I can't do anything without seeing the files.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
sir,
i am uploading the 3d file for your review.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Be sure to post your files in the other thread you have going on this subject.
https://forum.solidworks.com/message/308793#308793
Cheers,
Anna
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Good idea. Here is a simple assembly of a cam and lifter mechanism which, not surprisingly, I couldn't get working in basic motion. You'll see I have a simple motor on the cam, and gravity. I've added and deleted constraints, and fixed and unfixed components. The time bar still turns red when I calculate it and nothing moves.
Thanks for the help.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I have no idea why you couldn't get it to work. I just opened it, did a Ctrl-Q to be safe, and recalculated. Only problem was that it needed a distance mate to keep the cam shaft from walking, but even with the horizontal movement of the shaft is solves easily.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I got it to work (after adding a distance mate to constrain axial DOF of cam). Not representative of the results I usually get with constant speed motors, though.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
What's the problem with constant motors? They are the mainstay of a lot of animations and have given exceptionally consistent results in my experience.
Also, see the post to Kyle. His animation needed an axial constraint, but it still worked without it, so what problem did you see without it?
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I usually run into trouble with intermittent contact.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Problems with a constant motor and intermittent contact are two different things. Intermittent contact comes from the settings you use for your contact in the motion study properties. With low geometric accuracy, the surface is a coarse mesh and is very bumpy which can cause the follower to skip and jump. You also have to couple this with the 3D Contact Resolution which is the spring value of the contact. With low resolution, the surfaces will be allowed to overlap more and with it set to high, the overlap will be less. No you cannot eliminate the overlap completely in either physic based motion study type as this is a rigid body solver. If you don't want the follower to skip or overlap, use an animation study type and a cam mate.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Well, I'm still having no luck. There must be something wrong with a setting perhaps, though I can't figure out what.
Jim, you're probably right in that nearly everything, if not everything, can be done with animation since it's just for graphic purposes. I just thought it would be easier to use a contact and gravity for something I was doing at the time. The cam example was just created for problem shooting on the forum. It does, however, drive me nuts that my computer won't do something it should be able to!
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Did you try adjusting the contact parameters in the Motion Study Properties? When I ran your example, I used the default and max and min to see the difference before I added the distance mate. With the accuracy set a minimum the shaft drives in one direction and at max it goes the other way. This is a result of the size of the tesselated mesh. When the mesh is too coarse, the surface is bumpy and the contact can generate forces (motion) in different directions.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
I did actually. No luck. I should mention that even if I delete all contacts and gravity, I can't get the motor to work alone. Same goes with gravity alone. Something seems to be preventing SolidWorks from calculating anything at all.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
As you provided the files, maybe some others who are reading the forum could open your model and see if it solves. That would help to determine if it was something specific to your installation or not.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
More details... I downloaded a model that someone else had applied some physics to with Basic Motion and it ran fine when I pressed play. However, when press the "Calculate" button, the time bar turns red again and nothing moves.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
As files and motion studies you create will not play on your computer but will play on other people's computers, and files that work OK on other computers will not work on yours, it sure sounds like a local problem. While this is the option of last resort, it is sounding more and more like it is time to do a complete uninstall and then reinstall as you probably have a corupt installation. You just have to weigh the time spent doing the uninstall/reinstall against the time wasted continuing to troubleshot the problem.
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Re: Basic Motion doesn't work (gravity, contacts, etc) but Animations work just fine?
Maybe I'll have to do that sometime. Probably not immediately. Thanks for everyone's help.
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