Limiting distance in advanced design.

[Ertan_Akbayir]

When we work machine elements like cylinder and piston. We need limiting the distance of two bodies. 

Is there a way to limiting the distance in adv. design?

[sobrien-2]

One possibility may be to create an variable expression to set a maximum distance.

[Ertan_Akbayir]

I have no idea how to write a variable expression. Do you have a sample solution like this? There is not any sample in the help menu. 

[sobrien-2]

Attached is the doc for writing expressions on Elements Direct Modeling and an example expression using IF ELSE

[Ertan_Akbayir]

Thank you very much for this superior sample. It looks great. I need to study too much in this topic.

[Ertan_Akbayir]

I need help limiting piston stroke between 0-40mm. File is attached. I tried to much from the help menu but I could not get it properly. 

Thank you very much

[sobrien-2]

I am not sure about the specifics of the case you presented so the modification I made are more intended to show the use of the IF THEN ELSE & Variable Check in Advanced Assembly.  Variable A is the distance the piston moves.  Vchk1 check to see if A is within the range of 0 to 40 otherwise it generates an error.

[Ertan_Akbayir]

Thank you for attention but I just want to limit the stroke when I use position command. 

Sample video is below. NX has solved this years ago nicely.

https://www.youtube.com/watch?v=
QJ60SHLgNyI

[SavaS]

You can try something: When using "Position" in Adv Assembly there must be a check box for "Stop at clash" and a check box called "Physical". Try to tick one of them (and maybe "Update Relations") and see what happens.