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i designed a gearbox with 3 shafts.i wanted to do sth so shafts only have rotating movement and not any other type of movement.i cant find any type of mate that can do that,any suggestions?enter image description here

enter image description here

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    $\begingroup$ If you have not yet designed/built the housing (which would constrain it in real life) then you need to add reference geometry (either as a master model - recommended, or inside the assembly) in order to constrain the components. $\endgroup$ Dec 10, 2019 at 14:33

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See the .gif below showing how you might set these mates up. You need to add another part or a sketch into your assembly with axes in the correct places, and then mate your shafts to be concentric to those axes. Here I have set the parts coincident to the front plane to also limit their axial movement.

Shaft constraint with master model

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  • $\begingroup$ axial movement isnt the problem.the problem is kind of movement it has according to picture recently added. $\endgroup$
    – erfan
    Dec 10, 2019 at 15:15
  • $\begingroup$ Hi @erfan - I understand your problem, and I have presented the solution in my answer. Can you try and explain to me which part you find unclear and I'll try to present it another way to help you understand? $\endgroup$ Dec 10, 2019 at 15:35
  • $\begingroup$ Hi,i didnt understand the mates,you say coincidence with front plane solves the problem but it will move the way i said in front plane too,look,i did another thing,i draw a circle in front plane and used the mate cocenteric for shaft and the circle,but when i try to rotate the gear it say its defined and cant be moved... $\endgroup$
    – erfan
    Dec 10, 2019 at 15:40
  • $\begingroup$ I have put the key point in bold. Coincident with front plane fixed axial movement in my case, because the master sketch was on the front plane, so this should not be your focus. It is the concentric constraints to the axes in the master model that you need, which fixes the position of the shafts, while allowing them to rotate. $\endgroup$ Dec 10, 2019 at 15:41
  • $\begingroup$ exactly,but when i use concentric constraint the error says the selected component is fully defined it cannot be moved.something like the only way it can move is movement of shafts center. $\endgroup$
    – erfan
    Dec 10, 2019 at 15:50

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