Viewports coming in at strange scale from DWG

[Christiaan]

I'm importing DWG drawings and I've verified that the information on the design layers is the correct size, so I have the units correct (mm), but the Sheet Layer Viewports are at a weird scale and don't fit correctly within the Sheet border.

 

For instance I end up with a Viewport which should be at 1:100 coming in as 1:96.280 instead.

 

Have a feeling I've come across this in the past but can't remember how I resolved it. It's quite a few files, with other objects on the Sheets involved, so I don't want to correct them manually if I can help it.

[Christiaan]

Seems to me the only option I've got is to manually scale everything on each Sheet Layer. Fortunately they're all incorrect by the same proportion (3.72%), so I can just select everything on each Sheet and scale by 0.9628

[zoomer]

52 minutes ago, Christiaan said:

Fortunately they're all incorrect by the same proportion (3.72%)

 

OK, if you had given a more useful number, I would have said that

it is maybe because ACAD Paper Spaces/Sheet Layers have their own Scale option.

So things that VW does not have may get lost in translation.

 

But scale by 0.9628 !?

Seems more like USD to EUR conversion .....

 

It feels like everything in ACAD has its own Scale.

PaperSpace, Viewports Annotation Layer, Annotations, Texts, ....

 

So much that I was not able to manually create a useful Sheet with a few Viewports

with everything in a same give Scale from scratch.

[Pat Stanford]

That also sounds like something that could be page margins for a printer. Is there a setting in DWG import to scale to printable area of the page?

[Christiaan]

16 minutes ago, Pat Stanford said:

Is there a setting in DWG import to scale to printable area of the page?

No, only for model space.

[Christiaan]

This seems related. That's their drawing border extending past an A1 page border.

 

[Pat Stanford]

Red is A1,  Green is ASME D (36 x 24").  Could be paper size issue.

[Christiaan]

Must be right? But it can't be ASME D, that makes it even worse.

[Christiaan]

Their border, correctly scaled measures 804 x 580 mm (31.65 x 22.83 inches).

[Pat Stanford]

My mistake.  Red is A1.  Green is ASME D (34 x 22).  Blue is Arch D (36 x24).  So 36 x 24 with uneven margins (larger on left/right) seems like it could be the issue.

 

[Christiaan]

You're definitely right that it's the page setup that matters. Changing page setup to Arch D before importing changed the Viewport scale, but now it's 1:87.927! 🤣

 

I'll see if I can reverse engineer it in the morning and create a custom page size to pull it in at the right scale. Thanks for pointing me in the right direction Pat.