could anyone explain me about make flexible option in Pro E assembly ??

Please see the tutorial

  1. Step 1:

    Flexible option is widely used in assembly by many designers. The concept is very simple please follow the tutorial .

    Make 2 circular plates and assemble it , using the dimension shown in the image

  2. Step 2:

    create a spacer as per the dimesions shown in the image using extrude command

  3. Step 3:

    right click the extrude feature in the model tree, and select dim 20 (length) and again right click to go to properties and change the dim name to "length" as shown in the image

  4. Step 4:

    go to file>properties and in properties window select change against flexible as shown in the picture

  5. Step 5:

    select the dimension which you want to make flexible as shown in the picture. save the part

  6. Step 6:

    Go to assembly and call this part for assembly, click "yes" in the message box as shown in the picture

  7. Step 7:

    In the box go to methods and select distance as shown in the picture, and then select the inner face of the assembled circular plate, you could see now that the length of the spacer is changed, and is equal to the distance between the plates

  8. Step 8:

    you need to assemble the spacer by mating and aligning the axis as shown in the picture

  9. Step 9:

    Now if you change the distance between the circular plates the length of the spacer automatically get adjusted.