modifying a sketch reference point?

[veggiedom]

This is what I have, but after building it 'a' needs to go to 'b' to give it more strength.

 

Within my sketch, changing from 2*(PWS/3) to 1*(PWS/3) gives me the correct dimensions on the inside frame

see:

but halves the outside frame, hence me drawing x2 above.

I cannot seem to shift the sketch by pws/3 whilst maintaining the outside frames thickness (c)

could someone please explain how to do this, Thanks.

 

[jhackney1972]

You post says you want to double the thickness of the outside frame.  The video will show how.  Model is attached.

By the way, you are posting to the wrong Forum for design questions.  The Support Forum is for Fusion 360 application issues, problems, and installation questions.  Design questions should be posted to the Design and Documentation Forum, please use it next time you have a design related question.

[veggiedom]

Thanks for your video John, but that makes A= 16.67 when I need it to be 2x16.67.  

I Need:

PWS=40

A=2 * ( pws / 3 ) = 26.67

B=A

C=2 * ( pws / 3 ) = 26.67

I built it in place and constructed the sketch for the outside frame on the inside frame, so it's locked to point 'e' (coincident constraint, after applying dimensions to the rectangles). what I need it so remove the coincident, modify (as you did) C to '2 * ( pws / 3 ) = 26.67' then apply a midpoint coincident on the two rectangles.

When I built the window, I wanted 'A' to be thicker, to protect the joints. I didn't think it necessary for the inside and outside windows to be flush. 

Am I making sense?

[jhackney1972]

I am afraid I will have to pass on your model as far as the parametric dimensions.  I have looked at it and cannot quite figure out your logic so I am going to pass.  I feel you have interlaced the sketches too much and it is extremely hard to modify and control.  Good luck getting it to work.

[davebYYPCU]

You might have to think outside the square (pun intended) Did you abandon the Recess?  18mm and 13mm (weaker joint) are not quite the same.

Layout sketches, make the corner system for each frame, and then pattern the components.

I used your parameters, as far as necessary, I can't break the model with (larger) changes.

Might help.....

[veggiedom]

Thanks for your file Dave. I'll try and understand how you approached this task. I think it's clear I've overcomplicated the task. I need to watch some more youtube videos on overall approach, in particular sketch construction and how to build assemblies.

[davebYYPCU]

Walk up the timeline, step by step, Check settings, and ask questions.  I have used one of many ways to do your project.  My file will break an extrusion or two, if you change the Recess less than Pws * .334 or greater than PWS * .667. 

Might help....