Motion link not working.

lsnook
Contributor

Motion link not working.

lsnook
Contributor
Contributor

Attempting to establish a motion link between two gears.
I have created 4 components, two gears and two shafts (both grounded).
The gears and shafts have revolue joints.
I am trying to make a motion link between the gears but with no success.
Gear one rotates but gear 2 does not turn. Gear 2 has a Flag and a line revolving around the center.
The line is rotating in sync with first gear flag but the flag on the second gear does not turn, only the line turns.
The line revolves but the flag and gear 2 doesn't.
Here is the attached file.

https://hotmail438208.autodesk360.com/shares/public/SH512d4QTec90decfa6e115c9966bfa5aad1

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Accepted solutions (2)
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g-andresen
Consultant
Consultant

Hi,

Please share the f3d file directly as an attachment and not via an "unknown" link.

 

günther

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lsnook
Contributor
Contributor
Thanks, I am not sure how to do that since the file is in the cloud.
I tried dragging the file from the data panel but doesn't work.
Any thoughts?
Lee
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g-andresen
Consultant
Consultant

Hi,

start design >>

File > export > save as f3d on local drive > attach to post 

 

günther

 

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jhackney1972
Consultant
Consultant
Accepted solution

You were real close.  The large gear Revolve Joint was not to the gear but between the Pin and the sketch so the gear was not rotating, only the pin.  Model is attached.

John Hackney, Retired
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lsnook
Contributor
Contributor

Thanks so much! Been beating my head against the wall and watching more you-tube videos for a couple days now.
I think that I discovered that a few minutes ago. So, the rotating line was for the shaft not the gear. OK!

But how do I prevent this error from happening again? Am I selecting the wrong thing or out of order when creating the joint?

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jhackney1972
Consultant
Consultant

Just paying attention to where you are clicking when placing the Joint Origin.  Another way is to isolate the components you need for the joint or, in this case, turn off the sketch you place the Rotation Joint on.  After a joint is placed, you can hover over the joint in the Browser and it will identify the two entities you used when placing the joint, this may help you to review.  Also use a little logic, you said you saw the Revolve Joint icon revolving when you animated it so say to yourself, it is working so ask yourself what is revolving, that is what lead me to you issue.

 

Joint Components.jpg

John Hackney, Retired
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lsnook
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I hear what you are saying, thanks. Here is where things trip-up, I'll start at the end of the process. Setting up the motion link, when selecting the 2nd rotational axis, it seems to select the sketch not the shaft component. It then rotates the sketch...the solid line with no arrow, I guess. I've turned off all sketches in the browser to no avail. I go through all the initial revolute processes on each shaft and gear. Right clicking on "animate joints" works fine. I do this for both shafts. The individual rotate animations are fine. Now, create motion link, click on 1st blue flag, click on second blue flag, then animate yields 1st blue flag rotates but only the "line" in the second one rotates....it's driving me mad. By the way, I try to be very careful when selecting things....I've been an EE for 50 years have been down this path many times.
Although I appreciate it, don't feel as if you must reply, I don't give up easily, I'll beat this thing to death yet!
Thanks,
Lee
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jhackney1972
Consultant
Consultant

You main problem in this 3 gear assembly is your Pin grounding.  Unless you model a specific way, you have to Ground the component and not the Sub-Assembly containing the component.  The video will show this.  I would not have built the assembly the way you did but it will work fine.  Please remember to completely constrain your sketches using dimensions and sketch constraints.  You did some but not all.  I also noticed you use As-Built Joints. This type of joint works here but does have one drawback if you have to edit either component where you add the As-Built Snap, be cautious.  Model is attached.

 

John Hackney, Retired
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lsnook
Contributor
Contributor
Accepted solution

I did find the ungrounded shaft also. Good point about not grounding the whole component group. I'll watch that part again. I also found that when selecting the second point, it helps to flip the view up to only see that particular part, in this case, the shaft. The motion works fine when doing this.
Great job John, Thanks!!

Here what I have so far thanks to you. By the way, I'm doing this for my grandson who loves gears and mechanical things.

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