Screw motion simulation

Screw motion simulation

joergen_nilsson
Enthusiast Enthusiast
738 Views
2 Replies
Message 1 of 3

Screw motion simulation

joergen_nilsson
Enthusiast
Enthusiast

I got the screw motion correct using motion link, but why does the screw only rotate one lap when simulating the motion?

0 Likes
Accepted solutions (1)
739 Views
2 Replies
Replies (2)
Message 2 of 3

jhackney1972
Consultant
Consultant
Accepted solution

The Revolve motion limits cannot be set to more than 360 degrees.  Normally this is not a problem until you have a screw application then it gets to be a big problem as you have seen.  The answer is to add another joint, I use a Slider joint, and using a motion link between it and the Revolve, in your case a Cylindrical joint, to drive the screw the number of revolutions you desire.  The problem with this method is the default Joint animation speed is too high so you have to change it also.  You do this using a Text Command.  I show you how to enter this command into Fusion but I failed to mention that you must select for TXT entry.  The below graphic will show you the switch which is located at the far right hand side of the Text Command dialog box.  The text command is Fusion.JointAnimationTime and then a space followed by the number of seconds.  In my video you will see I used 20, Fusion default is 3 which is entirely too fast.  This variable will automatically reset to default the next time you restart Fusion.  I broke all links in your model so I could return it as a F3D file so you will not have to upload it, just hope it.  As you can see in the video you drive the model by right clicking on the Slider joint in my hidden added assembly and choosing Animate Joint Relationships.

By the way, I think you have the pitch calculation a bit wrong in your screw motion link.

 

Text Command.jpg

 

 

 

John Hackney, Retired
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.

EESignature

Message 3 of 3

joergen_nilsson
Enthusiast
Enthusiast

Many thanks, that was a great workaround.

0 Likes