schizzo 3d o 2d?

[ansyolitico]

Hi.
I would like to understand, what approach is best to use when you can
if like I had to make a reticular bar (triangular) like those of the cranes of the construction companies, it is better to make a single 3d sketch, or place more floors and use the normal 2d sketches?

is there a preferable approach?

 

[MassiVonWeizen]

3d sketch though at first are not easy to use

 

[ansyolitico]

It's a mess doing relationships so bad. really tough. I have to take my hand

 

[MassiVonWeizen]

If you do it in 2d when you have to make changes or variants you will have to deal with dozens of plans and sketches to manage that maybe they are bound together and you don't remember how.

 

[MassiVonWeizen]

a trick to manage 3d sketches is to create support sketches in which to insert points to use as a bond.
learn how to correctly use 3d sketches though an extra march if you make complex structures

 

[ansyolitico]

I'm using a lot of construction geometries as references. changes a bit the method but I'm realizing it's 10 times better

Thank you

 

[MassiVonWeizen]

remaining on your sample of the crane, build the first 3d sketch with 3 lines to make the bearing tubes (this should be easy), with another 3d sketch positions the points of the snodes on the 3 lines (so you already have the constraint that places on two axles and you just have to quota the position on the third).
at this point you do the sketch of the reticulates (you could only make one for all three sides but besides becoming heavy risk of not understanding anything with all the lines that cross; better to divide at least in a sketch per side)
you just have to use the structural elements to make the solid.

 

[ansyolitico]

on the structural elements, I do not understand how to cut them so that it does not take two faces of the main tubular but one, and if they are turned off align them with the faces of the main ones. But yes, making a single 3d sketch becomes a mess

 

[MassiVonWeizen]

on the structural elements, I do not understand how to cut them so that it does not take two faces of the main tubulars but only one

I have not understood what you mean, however there is the short/extended function as different options or you can act on the sketch line by inserting a split point and turning into construction the part you do not need.

and if they are turned off align them with the faces of the main ones.

I go to memory but there should be in the structural member function the alignment option of the profile

 

[MassiVonWeizen]

from the online guide

https://help.solidworks.com/2022/italian/solidworks/sldworks/r_profile_property_manager.htm

Profile alignment

aligns a group profile axis, such as edge and construction line, on each selected carrier. select the profile axis to align: horizontal axis vertical seat

this is the option to try

 

[re_solidworks]

if possible I prefer to use more 2d sketches. the sketch3d is more complex to manage, the number of necessary constraints increases exponentially and several times I have come to have problems of resolution that in reality were not there, was the solver that was at the limit and no longer worked properly. Moreover, in case of heavy changes, the 3d sketch is more failable and more difficult to fix. Finally, at the first course I did they told me to try to always use sketches as simple as possible, to have a lighter model to manage. in modeling better do more functions with simple sketches than just one function with a complex sketch. The same goes with skeleton sketches. In particular cases I also use 3d sketches, I know them well, but only if it is necessary.