Ball moving in a circular slot

- July 21, 2019 at 8:56 am
  
  Sidharth
  Subscriber
  
  Hello everyone,
  
  I created a cad model of a ball moving inside a circular slot similar to a ball moving inside a roller bearing. I tried to use the slot joint constraint for it with the ball as the mobile body and the circular slot to which the ball is tangent as the reference body but on solving the model I get the message of invalid joint properties
  
  I am confused regarding the results any help is highly appreciated.
- July 21, 2019 at 10:37 am
  
  peteroznewman
  Subscriber
  
  Please insert a screen snapshots of:
  
  (1) the message, (2) the joint Details window and (3) the Reference Coordinate Systems for Mobile and Reference.
- July 21, 2019 at 5:15 pm
  
  Sidharth
  Subscriber
  
  I actually want the ball present inside the pathway to slide under the presence of gravity
  
  for it, I have defined contact between both pathways as frictionless and the two rings as fixed to the ground and a slot joint between the ball and the pathways but on solving the message is displayed as unable to solve the result completely
  
  could anyone suggest the best way to set up this analysis
- July 21, 2019 at 6:56 pm
  
  peteroznewman
  Subscriber
  
  Slot constraint is for straight line motion, not a circular raceway.
- July 21, 2019 at 7:00 pm
  
  Sidharth
  Subscriber
  
  is there a way to make the ball move in the inner pathway( typically a ball bearing with no cage)
- July 21, 2019 at 8:53 pm
  
  peteroznewman
  Subscriber
  
  You can use frictionless or frictional contact between the ball and the two raceways, this is computationally expensive.
  
  You could put the ball on a revolute joint with the axis of revolution at the center of the bearing. That will keep the ball rotating around the center of the axis with very little computation required.
  
  The correct choice depends on what results you want from the simulation.
- July 24, 2019 at 4:10 am
  
  Sidharth
  Subscriber
  
  The solution was a very good suggestion
  
  But I am facing a trouble that when I include only the revolute joint as the contact joint I get a solution.
  
  But when I include frictional contact along with it the solver is unable to solve the solution completely and I get a message as
  
  I have an 8gb ram I 5 Intel Processor Laptop, so the frictional contact being computationally expensive won't be a major issue I guess
  
  Could anyone suggest any reason and remedy for this problem.

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