Where to “ROLL” a view and why is it different?

[Conklin]

Starting in the assembly (..sldasm) and looking straight on to the front view and doing "this" (above in yellow) to roll the view 180 deg, everything looks good, you zoom in and show hidden lines and all and all looks good, it rolled the view 180 deg just fine. So I save that view as a saved view in the assembly (call it "180degrotate") I make a drawing and drop in that "180degrotate" view and think all is OK BUT it is not! the view turns out to be OFF by:

360.00 - 359.96005626 = .03994380 degrees!! in the drawing

SOLIDWORKS roll view 02.jpg (5.52 KiB) Viewed 1875 times

On the other hand dropping the assembly view looking straight on to the front plane into the drawing and THEN rolling the view in the drawing 180 deg makes the rotated view perfect!! in the drawing. Now why is that????

[Frederick_Law]

Typical SW. Just good enough LOL Nobody can see the different.

There are other ways to do it exactly, I think.

[DanPihlaja]

My guess is that, for each click of the arrow key, there is a XYZ possible deviation that is associated with it. In other words, each click of the arrow keys is a separate rotation, complete with its own potential deviation It might be extremely small. but it is still there. These add up.
If you have a bigger number here, it would lessen the number arrow key clicks.

However, when you specify the degrees in the rolled view at the drawing level, then there is only 1 rotation.


Personally, I prefer the "relative to model" approach for inserting drawing views.
https://help.solidworks.com/2018/englis ... l_view.htm

[Conklin]

Well I was drawing a cylinder
Actually some modifications to a standard 55-gallon drum
and in the drawing, I was trying to dim to a hole I wanted to put in the drum from the top
But the top was not an edge it was a very shallow ellipse as it turned out and I had trouble
snaping to the edge. That's how I figured there was something amiss.
So I fudged it and let it go for a few thousands of an inch was not a problem in this situation
But in a precision case it would mess me up.

[Glenn Schroeder]

Personally, I prefer the "relative to model" approach for inserting drawing views.
https://help.solidworks.com/2018/englis ... l_view.htm

. . . or click on a face, hold down Ctrl, click on another face, then go to "Normal to". That will orient the model with the first face at front and the second at top. Save that view and reference it in the Drawing.

[Conklin]

Glenn,
Good idea, and I tried that on a test model/drawing
But until I added the Flat it did not go upside down.

I even tried to pick the plane and the bottom
thinking that would flip it, but alas NO.
Trouble was I did not have a flat on my Drum.

[TTevolve]

Rotate the drawing view, not the assembly.

Same front view rotated 45 and 90, but you can pick any angle.

[Conklin]

On the other hand dropping the assembly view looking straight on to the front plane into the drawing and THEN rolling the view in the drawing 180 deg makes the rotated view perfect!! i

Yea thats what I figured out

[zwei]

As other mentioned, it will be easiest to just rotate the drawing view...

As Dan mentioned, it most probably because the deviation of multiple rotation. AFAIK, SOLIDWORKS is using radian for view rotation instead of degree, so there is some unit conversion going in the background during view rotation.

Or maybe you might wan to try using macro?
https://www.cadforum.net/viewtopic.php?t=2191

[JSculley]

Rotate the drawing view, not the assembly.
image.png

Same front view rotated 45 and 90, but you can pick any angle.

Please don't do that. Rotated drawing views cause all sorts of weird behavior and it isn't obvious to anyone coming along after you that the view has been rotated.

[Conklin]

Or maybe you might want to try using macro?
https://www.cadforum.net/viewtopic.php?t=2191

Yes, I used/tested your macro
Rotated a view in the assy with it
once 4 x 45 deg to equal 180
& Once 1 x 180 to equal 180
saved both as separate 180 deg rotated views
put them in a drawing
& both were perfect 180 deg rotations in the drawing
The view I dropped in, having rotated it in the assy with the ALT-Arrow keys
was off by the very small amount in the drawing that I first found it to be off.
so somewhere in your macro you must NOT be rounding off that rotating degree/radian increment!
It is sad to believe that the Solidworks programmers cannot do the same.

[TTevolve]

Please don't do that. Rotated drawing views cause all sorts of weird behavior and it isn't obvious to anyone coming along after you that the view has been rotated.

Yea, I wouldn't recommend doing it either unless you have to. Only time I really have had to do it is with sheet metal flat patterns to get the view to show they way we have to make it.

[Conklin]

Well… when you start a job it is just a quote so you grab any model that you can use, to quickly present the concept to the customer. My case it was a very well modeled 55 gallon drum on/from the GrabCad site, of course it was modeled with the open top UP. I left it that way for I was going to use one drum that way and another “UPSIDE DOWN” After modifying the “UPSIDE DOWN” one to make it work in the concept, I get the job, now when I want to detail, it its upside down! To avoid any confusion as to how it is going to be used in the actual assembly, I want to detail it as it is to be used, upside down. Thus the need to “FLIP” it. It is WAY too much trouble to go back and properly FLIP things the way they should be (to be right) for this one of a kind bespoke piece of equipment.
Solidworks has allowed us to so quickly pull together concepts to win the quote… That, we must, to make money on the job, follow thru and use any shortcuts necessary. Other wise we LOSE the job to the other bidder. That’s the way it is. Trouble is Technology has made us SO much more productive, BUT our pay scale has NOT reflected that increase. (That’s another story)

[Frank_Oostendorp]

Please don't do that. Rotated drawing views cause all sorts of weird behavior and it isn't obvious to anyone coming along after you that the view has been rotated.

Well, if you follow ISO standards, there has to be information on drawings that exclude any doubts, the label shows everybody the view has rotated by an angle in a direction as indicated.

[Dwight]

Well, if you follow ISO standards . . .

Same for ASME Y14.3.