Rotation and stretch

[Anonymous]

 Hello,

I'm new into dynamic blocks and I'm trying to create rebars for reinforced concrete.

Block is generaly dependant on rebar diameter which complicates the task. The one that I attached is a simple one with straight angle.

What I want to do is to add an angular parameter (as on the attached printscreen) which could "bend" rebar to a certain angle, but the problem is that when I change diamater of rebar also a rebar bending diameter have to change (also a center point of an arc).
Testing of attached block should clarify a problem.

I'am an AutoCAD 2017 LT user.

Thanks for support!

Tom

[h_s_walker]

You can't do it in LT. You need full AutoCAD to set up Parametric constraints for the bars to work.

[Anonymous]

Thanks.

It seems that I need an upgrade 🙂

[h_s_walker]

Yeah I know it's a pain. I started creating some blocks to Shape codes and deliberately crossed out all which had angles which weren't 90 degrees as I knew I wouldn't be able to create them without constraints (I'm on LT2016)

[steven-g]

You're block is impressive. Here is something to play with, it uses a trick to visually allow arcs to follow your geometry (it uses an angular dimension with arrows and text turned off/overriden). The yellow lines where used to place the angular dim correctly, and they could be hidden with line color, and probably be positioned somewhere else. This is just to give you an idea, I'm sure you can do something with it. And post the block back if you get something working it's an interesting project.

[h_s_walker]

Looks like I might be able to use that idea as well

[Anonymous]

Thanks, i will do my best and post the results.

Tom

[h_s_walker]

I've given up. The base point of the rotation really needs to be at the point where the radius and the straight line meet.

[steven-g]

?? it is. What are you trying to achieve

[h_s_walker]

Trying to show the bending of a bar. Look at number 62 for an example.

[Anonymous]

Thats exactly what I want to achive. With multiple acute and obtuse angles.

So far I'm still having a problem with relocation of "bending arc" center. Although workaround for arc stretching works perfect.

Tom

[steven-g]

Yeah I'm seeing that problem too, when you try and change the radius, maybe constraints are the only answer in a case like this. Shame

[Anonymous · Accepted solution]

I can't find any solution. 

Thanks for help anyway.

I think that center of rotation and bending radius has to be the same and constant, but still i can't get it working.
Even if it would work, then problem with double bended rebar like nr 49 mentinoned above wouldn't work with this method.

Tom