Hi could anybody please show me how to define the mates in the centre so they do not move up and down or left and right
Use Concentric mates for rods into holes and springs over rods. Select the "lock rotation" option to prevent turning.
To prevent a rod sliding out of a hole, use either a coincident mate with hole bottom or a distance mate.
You can also mate between planes in different parts (both coincident & distance).
Open the spring part file and examine its planes.
In the spring's file:
In the assembly:
I hope this helps.
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