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How to model a spring and ball fitted inside a box which is pressed to a steel surface (guide bush with crator for the ball to roll into)?

Abhishek Kumar

While modelling PTO shifting mechanism in tractor I need to model a box fitted with spring loaded steel ball (diameter 10 mm) which is pressed against a surface (of guide bush). The surface has small seating or crator in which ball can rest and mechanism can latch to that position. While shifting, there will be relative motion between the surface and the box fitted with spring loaded ball until it rolls inside one of the seating. The stiffness of spring is 4.4 (kg/mm). While I can model the system with general solid to solid contact, I would like to know if there is a better method to model such interactions. Also, if I need to model contacts, what should be the parameters for steel to steel. 

Thanks in advance!

Regards

Abhishek

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