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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
This should detail the problem a little more clearly... I cannot make the front piece follow around the corner of the track and the bar linkages pivot without overlapping or moving in the wrong direction..
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Create a Curve that represents the roller centerline path. Create a surface using the curve as the base sketch. Mate each roller axis to the surface
Jason
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Hi Jason,
I have created a sketch in the assembly and used a path follower. This works in to an extend but the bar linkages swap and flip at times and I cannot make the mechanism extend smoothly...
I have also tried using the slot tool but have had no success there either.
Fabia
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Adrian Ilie
Apr 3, 2015 1:03 PM
If you are using SW2015, try with Chain Pattern. This functionality is new in SW2015.
Adi
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
The reason things are flipping is because your mates are having to jump to new segments of a sketch. a curve does not have segments and a surface that is created from a curve does not have multiple faces. Give it a shot
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Did a little more fiddling: create a surface that represents your path and use a spline to to define the surface. that will give you an un-interrupted surface. then place points at the centers of your wheels and mate the points to the surface. Should allow you to move your 'cart' along your path.
Also, note that your linkage design does not allow your linkages to go around your curves. The pallets will lock because the pivot between them is not held a constant distance from your track
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
trying out some different track types...curved
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Hi Jason,
just to confirm: it is not possible to apply a hinge mate to a part which is also mated to a path mate that follows a circumference?
Trying to think of ways to overcome this or just show how each part work separately..
Having all kinds of trouble with the path mates in all my assemblies now! -.-
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
You may be able to achieve it with path mates also (maybe that's what you tried already). However I am a bit confused about the assembly. You show a picture of a hinge but I don't see that hinge anywhere in the final assembly. Also the tables appear to not be mated to each other. Is the hinge supposed to go between each table?
If you could upload the assembly and all part files then other users could experiment with different methods to achieve the motion you want.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Hi. Thank you for all the help Jamil, Ingvar and Jason.
I have been using path mates and have would like to attach the files for you.. I cannot see where to though. I will have a look around.
If the hinged mechanism and path of the track cannot work together then I guess I will have to do motion studies of the separate parts...
Thank you
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Yes.. sorry. I'm quite tired (trying to write a 15000 word disso in 1 week at the same time as making this assembly work and create a motion video of it.. which I've never done before either..)..
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Fabia,
please use pack&go and upload the files here. Some files were missing
Also have a look here regarding Forum Posting #15 is about pack&go
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Hi,
I have used pack and go as you said..
this should have the assembly of the track system I am working on now..
I haven't used the bar linkages in this one. I am simply trying to make the path mates work for the slats..
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Here is one I was working on earlier.. as you can see it is ALMOST working. I don't really mind about the bar linkages moving in the right direction but if the could at least just follow round with the other components...
Thank you so much for all of your help
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Might be possible to do this with the new chain pattern 2015 What's New in SOLIDWORKS - Chain Pattern
Have not tried it yet though.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
What if you delete the wheels from every other cart. Hinge each un-wheeled table to the wheeled tables. this will allow each table to float around your track.
GDG
you might even spread the wheels to the corners to get a more fluid movement.
You may also try to eliminate only one of the wheels on each cart and hinge the un-wheeled end to the wheeled end of the next cart.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
The wheels are not what is linking the 'carts'.. the 'bar-linkages' are (these are only shown in on of the zip file assemblies I attached. I am afraid that centralising the point of the 'cart' that follows the path and is mated to the path means the 'cart' does not move around the track as I need it to: the 'wheels' themselves must remain in contact with the track slot at all times as it moves around the corner in order to prove the principle of the design I am trying to achieve. I had previously achieved this type of path mate as I had watched similar videos on how to do so but this is not how my design will work in real life. Perhaps this chain tool will work.. I will give it a go but I am rapidly running out of time.
Thank you for your help and all your suggestions.
Thank you Ingvar.. I can't seem to find the file. again.. I may be being stupid.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
The files are in the bottom of the post (zipped).
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Fabia,
- This is clearly a good one for the new chain pattern in SOLIDWORKS 2015
- You could make a new path, that represents the center between the points on the carriage. And use path mate to the new path with one point (center point) instead of two, so you can use the Roll Control and follow path. Instead of using additional mates to achieve that.
- And further to what Jason said, just use a plane surface that is one face. I made a simple setup up of what jason said, you can find that attached.
When I´m doing anything like this I like the center to be in the center etc. that´s why I deleted all of your mates before I started and rearranged a bit.
But I agree, this have been tricky in the past (before the new chain pattern in SW15). One good tip is to move them slowly.
Hope this helps.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Ah thank you but unfortunately this is not how the mechanism needs to work.. the 'carts' and 'slats' cannot overlap at all. They should be running freely driven by the bar linkages. I have had an idea of a simplified version but it is a shame that the mechanism I need is not possible in solidworks...
thanks again
Fabia
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
have you tried moving the wheel center out wider than the slats. this will keep the slats from overlapping. also try adding hinge stops so the carts can only rotate so many degrees
GDG
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Sorry, I'm not sure I understand...
The following wheels do run offset from the 'cart' component. They are only joined by a coincident made of the hole for the wheel 'pin' and the wheel 'pin' itself. Do you mean I should offset it more?
I combined hinge stops in with the path mates and this stopped any movement at all. It had become 'overdefined'. Perhaps I was using a wrong combination of mates?
Fabia
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Fabia Goff wrote:
Ah thank you but unfortunately this is not how the mechanism needs to work.. the 'carts' and 'slats' cannot overlap at all. They should be running freely driven by the bar linkages. I have had an idea of a simplified version but it is a shame that the mechanism I need is not possible in solidworks...
thanks again
Fabia
Fabia,
sorry for that one. I was only demoing the Surface approach.
Here is another set of files with the linkage between them. And like before I did not finish it for you. The only thing that I did in addition to before was more of the same.
What do you say about this one ?
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Hi,
thank you so much for showing me this. This is actually the stage I had reached before but my linkages still moved. This will have to suffice for the submission as as has been mentioned, it is not possible to rotate the bar linkages at the same time as follow the path. I was wondering how I could now achieve the motion along the track in an animation.. I have been trying to achieve this also all day and have had no success even with watching multiple example videos.. it cannot simply drag up or down. The motor needs a path to follow and this assembly has none now? How can I move it out in stages and link these movements together? I know this is a 'cheating' type method.. but I am looking for the quickest and ANY solution at this point.
Fabia
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Fabia,
can you please make simple sketches of the position of the parts in steps through the motion (with a pencil and a paper), scan them in an add them here. If you do that I can take a further look at it if you want.
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Re: Complex (impossible?) mechanism movement mating combination.. How can I achieve a bar linkage track system?
Fabia -- Is this what you are looking for??
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