Constrained Attributes of a dynamic component

[dbkettle]

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.

[pcmoor]

Hi David

you need to build a relationship between position and size as well
example attached

philip

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frame.skp

[dbkettle]

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.

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frame2.skp

[pcmoor]

Hi David

you probably sorted the concept out by now

however if not...

Each group or component has its own origin axis, usually left bottom side. If you right click on the axis you can change its position, but at this point, probably best to leave it.
if you double click to open a group/component within a group/component you will likely notice a shape defined axis and a dull smaller axis. This gives an idea of the relationship between the two objects.

The formulas and process is similar to a spreadsheet application, you can click the cells in to build the relationships rafter than typing

I find it convenient to build an object with known size and positions then figure first the lengths and then the positions

Philip

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fixed glass