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rotary motion

Question asked by Roland Holtz on Feb 22, 2008
Latest reply on Feb 27, 2008 by Ian Hogg

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i am a relative newbie to solidworks and so far it's been good however now
i have a shaft with a bellcrank operating a linkage that i would like to animate.
when i apply a rotary motor to the shaft all it does is ocscillate back and forth a few degrees.
i have changed the numeric value from 0 to 360 deg/s with no change.
this is very frustrating since i can manually turn the shaft and the linkage operates properly.
can anyone help? it would be greatly appreciated
thanks

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Ian Hogg Feb 23, 2008 12:47 PM
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Hi Roland,

Can you attach a snapshot/image of your motor definition (ie in the property manager) or attach the model to the post? It's easier to review by looking at what you have.

A few things to double check:
Motor is actually on the shaft
Motor type is constant speed (not oscillating or distance)

One other aspect if you're using 2008, is that depending where the current frame position is on the timeline, when you modify an entity like the motor, you are defining the properties at that time position. The program interpolates between the keypoints where you specify the properties of each entity.

To be more specific in answering, you need to specify if you're using COSMOSMotion, Animator, or Physical simulation as well, and the version of SolidWorks. You may not that many people have a signature listing their version of SolidWorks etc, so that when they make posts, it is automatically known what they're using.

Cheers,

Ian
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Roland Holtz Feb 25, 2008 5:39 PM
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Ian;

I am also a newbie Forum user so your patience is noted.
I can't seem to upload any files. They keep getting error messages.
I've tried *.sldasm, *.htm, *.jpg an d*.tif.
The only only one listed is the *.jpg and it doesn't show the dialogue box from the feature manager when I inserted the rotary motor.
I'm using SolidWorks 2007. To attach a motor I did the following;
From the pull down menu, [ Insert ], [ Simulation ], [ Rotary Motor ]
Then when the Rotary Motor pops up I entered the edge of the shaft in
[ Direction/Velocity ] window and for the Numeric Botton I entered [ 360deg/s ]
then clicked the check icon and from the side bar pushed the play arrow icon.
the same result every time, partial rotation then it oscilates rapidly back and forth
with minimum motion. It's movement is barely detectable.
I haven't found where you can choose the type of motor as you mentioned.
Your comments?

Roland
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- Pete Yodis @ Roland Holtz on Feb 25, 2008 5:48 PM
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  Roland,
  
  Make sure to zip your files before you try to upload them. You can attach anything as long as it has been uploaded in a zipped format.
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- Ian Hogg @ Roland Holtz on Feb 27, 2008 7:22 PM
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  Hi Roland,
  
  If using 2007, then the Simulation - Rotary Motor is part of "Physical Simulation". One of the nice things as Gerald mentions in 2008 is the consolidation of the different ways you can animate your assembly into one interface (animator).
  
  If you are just using the simulation toolbar (is has a calculate button and then just a couple of other buttons for replaying the motion, adding a spring, motor, or gravity) then there may be a part interference stoping the motion. By default in physical simulation (in 2007 or prior), it assumes all parts contact. If a collision is detected, it stops solving. Hence if you were to replay the motion, it would just a portion of the movement and depending on the replay preference in the animation control toolbar, you may see a something like what you describe.
  
  If you're trying to use COSMOSMotion, then the issue may be the motor you define is not mapped accross and so it's just rocking back and forth under gravity.
  
  So if you're able to zip up the model and upload it, I can take a look and provide more accurate feedback.
  
  Cheers,
  
  Ian
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Gerald Davis Feb 26, 2008 1:46 AM
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Roland -
A slowish speed of rotation and a short time frame for the calculated simulation can leave you with a motor that just oscillates.

Speed up the motor and/or delay more between the time you click on simulation calculate to start the calculation and click again on it to stop the calculation.

FWIW, I prefer the way SW08 works with motors & physical simulation over SW07.
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