Thanks Philip, I see how your attachment works really great.
Although when I tried to insert a pane of glass, it is clear I do not understand the relationship between position and size. (Is there a good site/place I can go to to learn more?). My questions are:

• I see under component attributes, of "component#2" the LenX and LenZ sizes have a symbol down the right side. What are these?
• I see under component attributes, of say "right", it appears that all the Size LenX, LenY and LenZ are fixed as they are all black type (not gray). I would have thought you would fix LenX and LenY but not LenZ? But clearly I am missing something?

Apologies of bugging you again. Much appreciated your response.

See my attached failed attempt to include a pane of glass.

David.

frame2.skp

I am trying to use the 'constrained attributes of a dynamic component" to make a simple window frame that I can scale up while keeping the window frame a constant size but it does not seem to work? Can anybody help?

For example, I have a 120mm thick window frame that is 45mm wide. I make the four edges of the window as dynamic components, constraining the edges in the 45mm wide, and 120mm thick dimensions, and leave the length unconstrained.

But when I scale it up (say x2), the edges first expand in width to 2 x 45, to 90, and then contract, leaving 45mm gaps between the glass and edging and an overhang of the outer edges - not quite what I was after?

Any advice appreciated.

David.