How to make a slotted assembly slide together?

When you add your mates, you can use advanced mates rather than standard mates.

  1. Step 1:

    I started by selecting the right planes of your outer slot and middle slot.

  2. Step 2:

    Under the advanced mates tab, select the distance icon (the number next to this is the current distance between the two planes). to get the freedom I think you are looking for I made the maximum value 3.5 and the minimum value -3.5.

  3. Step 3:

    I then repeated the steps matting the right planes of the middle slot and the inner slot.

  4. Step 4:

    I used the same values and after you click the green check you should be able to move your assembly the way you desire.