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valdas
Posts: 19
Registered: ‎07-03-2012
Message 1 of 5 (920 Views)
Accepted Solution

How to constrain movement in slot

920 Views, 4 Replies
01-09-2013 04:29 AM

Hello,

 

I have one problem and I would like to get your opinion how I could solve this.

 

I can't share models I have problem with, but I made another with the same problem.

 

problem1.png

 

Sorry for my English, but I don't know all the terms so it might be not correct.

 

I have two parts - one with slot, another with "pin". How to constrain the "pin" to always move in slot?

I had some ideas but non of them worked for me:

1. Use the Transitional constrain came first in mind, but it gives unsuspected results in this situation. Pin part is jumping around and ends up contrained in another place ir should be.

2. Contact solver kind of do the job, but it works quite bad. I gives no control or accuracy (i can not control how much pin is moved out)

3. I even thought of point on 3d sketch constrain, but it can not be done

 

How you would suggest to constrain the movement?

 

I hope I stated problem clear enaugh.

 

P.S.: I attached model files. I use Inventor 2013

*Expert Elite*
JDMather
Posts: 26,570
Registered: ‎04-20-2006
Message 2 of 5 (912 Views)

Re: How to constrain movement in slot

01-09-2013 04:46 AM in reply to: valdas

Look at the beginning and end of your sweep - doesn't look correct to me.

 

I would use Transistional, but do not drag the motion with mouse as sometimes the computer cannot keep up with calculations and the position gets messed up.  I would move by Drive Constraint on an offset Mate

 

or

 

use Joints in Dynamic Simulation for better motion behavior. (if you have Inventor Professional).

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Contributor
valdas
Posts: 19
Registered: ‎07-03-2012
Message 3 of 5 (900 Views)

Re: How to constrain movement in slot

01-09-2013 06:04 AM in reply to: JDMather

This model is only for showing the problem, I do not bother about details too much.

 

I figured out why Transistional constrain do not work well in this case. It is bad choise for curved surface like that, because my pin can not be tangent to the surfaces at all possitions.

 

I never though of Dynamic Simulation actualy, it works better than Transistional constrain in this case, but I can not use it for Possition representations for example (if I would need drawings in different positions).

 

Contact solver would work fine, but it do not try to find possiton where parts is not intersecting, and just do not let constrain to drive.

 

I just guess there is no perfect solution for this situation.

 

Thank you for the reply.

*Pro
sbixler
Posts: 1,883
Registered: ‎09-15-2003
Message 4 of 5 (893 Views)

Re: How to constrain movement in slot

01-09-2013 06:24 AM in reply to: valdas

Another possible solution is to create a path surface in the slot centerline and a follower surface for the pin, and then use transitional constraint between them.

Sam B
Inventor 2012 Certified Professional

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valdas
Posts: 19
Registered: ‎07-03-2012
Message 5 of 5 (883 Views)

Re: How to constrain movement in slot

01-09-2013 06:58 AM in reply to: sbixler

This is what I was looking for. Somehow I didn't figured out that I can constrain surface to surface with Transisional constrain. I wanted to constrain point to surface, but it is actualy the same.

 

So I made centerline surface on slot centerline. Than I created small surface sphere in center of the follower and I constrained tham with transistional constrain, thats it. Thank you sbixler. 

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