Cam and follower in Motion.

[JordanCClark]

Hi!

For those of you who have seen this toipc for a cam and follower in the Xpress forum--

For fun, I tried to put the assembly I had made into Motion. You can get the assembly here.

Now for my question/problem. I can set to cam to rotate, but the lever arm doesn't follow. My thought is that Motion is looking at only the assembly constraints and not the sketch constraints used to make the lever arm tangent to the cam. Can anyone verify this, or tell me what I missed?

Regards,

Jordan

 

[MilesH]

Motion can't work with Sketch constraints, Jordan. Nice try, though

 

[JordanCClark]

Crap! I'll go back and play with Nate's assembly some more. It looks like it's really close... :wink:

 

[NateLiquidGravity]

Unfortunately mine only works if you manually edit the sketch of the cam and rotate it little. The axis is nice for constraining the follower to though.

 

[wathavy4]

I am wondering why you are wondering at....
It looks working fine... :?:

I don't know the mechanics though....

 

[JordanCClark]

Like I said, Nate, what we have is really, really close to be able to use in Motion.

Toshi, the assembly works okay when you manually move the cam. It's putting it into Alibre motion that the problem occurs.

 

[MilesH]

You can use Precise Placement to set it in motion. Use the following settings and hold down the Enter key 8)

Seems to prefer tracking the inside face of the cam, though :lol:

 

[NateLiquidGravity]

This would be the perfect application for something I was thinking of. I don't have the knowledge yet but its similar to Alex's Parameter Wizard. In the small program you would pick a dimension (in this case an angle in the sketch) and update it as fast as possible. So by adding a few degrees at a time, it would rotate. Screenshots could be automated as well.

 

[MilesH]

I posted this before we were given Alibre Motion: viewtopic.php?f=10&t=1431&p=7076

 

[NateLiquidGravity]

Nice I could try to autohotkey that. But like I said unfortunately mine needs the sketch moved, the other example doesn't but does slip inside the part at times. I do see a use for a dimension updating program that could slide from one value to the another value and back. I'll look into both sometime.

 

[indesign]

Thought this was interesting. I wonder who could improve Alibre motion. It appears this is where it comes from.

http://www.ar-cad.com/index.html


and this link is to the example of a cam follower

http://www.ar-cad.com/examples/expert.html

 

[MilesH]

I wonder who could improve Alibre motion.

Jake Lyall, if Alibre asked him to.....