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Unable to link Conneting Rod with Piston and Crankshaft
noel_bergvall
Member Posts: 3 ✭
Hi. I´m currently working on just some basic internals of a combustion engine however I´m unable to link the Conneting Rod from the Crankshaft to the Piston. The crankshaft rotates just fine and the Piston works as intended in the cylinder but when I connect the conneting rod to both no matter what mates I use I just can´t get it to work. For now i have reverted to just using revolutes for the crankshaft and rod, with a simple fastend mate for the piston since when i tried to fix it everything broke (nothing would move).
Any suggestion on how to fix it?
I don´t have alot of experience with Onshape so all suggestions might help
Here is the link for the document https://cad.onshape.com/documents/f84f734b8650d9069d781a55/w/d26fa991e68b39583278543c/e/85eee7f5f3321edc438eaab7
Any suggestion on how to fix it?
I don´t have alot of experience with Onshape so all suggestions might help
Here is the link for the document https://cad.onshape.com/documents/f84f734b8650d9069d781a55/w/d26fa991e68b39583278543c/e/85eee7f5f3321edc438eaab7
0
Best Answer
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NeilCooke
Moderator, Onshape Employees Posts: 5,686 
I can't access your document completely because you shared it as a link rather than sharing it as public.
Anyway, what I can tell you is that this is a common mistake people make (and it's not your fault). Mate tolerances stack up causing the assembly to freeze up as you mention. Therefore, enable more degrees of freedom by changing the revolute between the crank and the conrod (or conrod and piston) into a cylindrical mate.Senior Director, Technical Services, EMEAI6
Answers
Anyway, what I can tell you is that this is a common mistake people make (and it's not your fault). Mate tolerances stack up causing the assembly to freeze up as you mention. Therefore, enable more degrees of freedom by changing the revolute between the crank and the conrod (or conrod and piston) into a cylindrical mate.