DWG Files Not Scale Says Client

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DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 5:22 pm

My client in France is saying my dwg files aren't to scale. I have no idea what's wrong folks.

he says he thinks my model isn't to scale, but the units are cm and set to two places like 3.00 cm

He says (translated from french) " I think the problem is the scale of the drawing before export.
Because when I open your (wrong) files, the drawings are at a scale (+/-) 1/500 in full screen and if I take the measurements on them c, is anything.

For example I import your Rafter Details file..... it is displayed at scale 1/251... to be in full screen. It is the scale of a surveyor for a terrain.
and when I take the measurement (in red) you see what I get!!!!!! measures in CM, mm "

This is his file he returned to me showing the discrepancies

1 rafter details.png


and I'll include the dwg file I sent him, also my dwg export settings.

1 dwg export.png


and the Units in my model.

1 Units.png
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Last edited by Joe Wood on Thu Dec 21, 2017 5:37 pm, edited 1 time in total.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 5:24 pm

I asked him what program he uses to read the dwg-

I use "Data Transporter", but it's probably adapted to my native format "3dxx".
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Re: DWG Files Not Scale Says Client

Postby pbacot » Thu Dec 21, 2017 5:56 pm

Have you opened the dwg file yourself? Send it to a third party for checking. Sounds like he is not using AutoCAD so you should be sure it's not actually his doing. Maybe at some point meters are being used instead of cm.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 6:02 pm

I included the dwg in my last post, I never use dwg so not sure how I can measure a dwg.
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Re: DWG Files Not Scale Says Client

Postby Bep » Thu Dec 21, 2017 6:50 pm

Goodday Joe,

The drawing is scaled 1:2,54 see point 2
As you see i scaled it a factor 2.54 to get the dimensions right
There is a smal error 0.03mm at point 1, you have to zoom in very close.
I use the(free) pCon.planner http://pcon-planner.com/en/download/ or Draftsight https://www.3ds.com/products-services/d ... -download/ software to use a .DWG
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 7:09 pm

Goodday to you Bep!

so what is wrong with my export to give that scale? I have dwg export set to full sized scale?

Or is the skp model scale set wrongly?
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Re: DWG Files Not Scale Says Client

Postby pbacot » Thu Dec 21, 2017 7:33 pm

I see. I opened in PowerCADD and at 1:2 scale, yes it is out of scale. My result is the dimensions are less than half of what they should be.

Not being familiar with your drawing (what scale it would be normally presented in) and metric drawings in general, it's hard for me to analyze what is going on as I would with a feet/ inches import.

I think you have to review your export process. You need to have some software to check your exports with.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 7:49 pm

Darn, well I usually work in inches feet, but changed this model to metric cm.

The model is too big to post, how else can we figure this out?
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Re: DWG Files Not Scale Says Client

Postby Bep » Thu Dec 21, 2017 8:14 pm

Probably someone with more experience in Layout can help you out here.
I suspect it has something to do with the settings in Layout versus Sketchup.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 8:19 pm

I'm not using layout, just exporting the dwg files.

strange as I get things cut by CNC using my dwg files and they always come out perfectly. I'm always using Imperial though and not metric in the model Units.
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Re: DWG Files Not Scale Says Client

Postby TIG » Thu Dec 21, 2017 8:23 pm

When you export a 2d DWG/DXF it is always in inches [SketchUp's built-in units].
When you export a 3d version it is set up in the model-units.

If you use imperial [inches] it doesn't matter with your exports when the recipient is using inches too.
BUT with 2d it messes up metric users...
So this explains the 2.54 scaling issue.

So either export as 3d. or scale a copy of the metric SKP down to suit (1/2.54) and use 2d export on that ?
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 8:38 pm

Tig do you mean set the camera to perspective then export?

geeze how do I scale a model to 1/2.54 ? Won't that mess up the on screen dimensions on the dwg file?
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Re: DWG Files Not Scale Says Client

Postby TIG » Thu Dec 21, 2017 8:47 pm

No, don't use 'perspective'.
Just use an orthogonal view, with NO perspective.

Then the 2d/3d versions are all but equivalent, but the units are sorted properly in 3d.

I see what you mean about any dimensions changing when scaling...

I therefore recommend exporting as the 3d version, or tell the recipient to scale down in the 2d CAD version by 1/2.54 etc...
In the CAD version the dims should be unaffected ?
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 8:52 pm

sorry Tig but I don't understand "exporting as the 3d version".
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Re: DWG Files Not Scale Says Client

Postby Bep » Thu Dec 21, 2017 9:34 pm

2017-12-21 21_29_26-joe.dwg - pCon.planner (64 bit).png
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Thu Dec 21, 2017 10:59 pm

That didn't work, it created a top view of the whole model?
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 1:05 am

How about this, I Edited all the dimensions but kept them at cm, then I changed the Model Units back to inches and exported a 2d dwg?

I measure these with P Con and looks good to me?
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Re: DWG Files Not Scale Says Client

Postby pbacot » Fri Dec 22, 2017 2:09 am

And LayOut can't do it?
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 3:13 am

I've never used Layout I'm hard core native tool SUpper!

but I'm trying it right now!

in Layout is it a dwg and can he measure the endpoints Etc?
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Last edited by Joe Wood on Fri Dec 22, 2017 3:20 am, edited 1 time in total.
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Re: DWG Files Not Scale Says Client

Postby Dave R » Fri Dec 22, 2017 3:18 am

Joe Wood wrote:I've never used Layout I'm hard core native tool SUpper!


Joe, that's like saying you own one of these but the only feature you use is the slot mortiser.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 3:22 am

yeah you're right but that's all I've ever needed out of SUp just the basic tools.

in Layout is it a dwg and can he measure the endpoints Etc?
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Re: DWG Files Not Scale Says Client

Postby pbacot » Fri Dec 22, 2017 4:14 am

Joe Wood wrote:yeah you're right but that's all I've ever needed out of SUp just the basic tools.

in Layout is it a dwg and can he measure the endpoints Etc?


No, I mean to use the LayOut dwg export. Actually I don't know. I use it in some limited fashion in Imperial. I get weird results tryin it in cm. If you need dwg files, I guess SU isn't the way.
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Last edited by pbacot on Fri Dec 22, 2017 4:15 am, edited 1 time in total.
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Re: DWG Files Not Scale Says Client

Postby Dave R » Fri Dec 22, 2017 4:15 am

Joe Wood wrote:yeah you're right but that's all I've ever needed out of SUp just the basic tools.

in Layout is it a dwg and can he measure the endpoints Etc?


You can export a DWG from LayOut. LayOut makes it easier to display the views of your model and its parts. You can add dimensions in LO if needed and generate PDFs with properly scaled views.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 5:23 am

I'd rather find out what my dwg export issue is fellas.
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Re: DWG Files Not Scale Says Client

Postby Dave R » Fri Dec 22, 2017 11:02 am

Joe Wood wrote:I'd rather find out what my dwg export issue is fellas.


From what I've read in this thread, you've been told what you export issue is.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 2:45 pm

I must have missed it Dave, does this dwg resolve it? All the measurements read correct for me?
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 3:27 pm

If the solution is using Layout, can someone point me to a Tut showing how to set it up for drawings like these? I tried last night but only got as far as the initial paper sizes, and none seemed to fit my drawing?
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Re: DWG Files Not Scale Says Client

Postby pbacot » Fri Dec 22, 2017 11:36 pm

Joe Wood wrote:I must have missed it Dave, does this dwg resolve it? All the measurements read correct for me?


To me that comes out of scale. Off by some factor less than 3. I guess it's what TIG said. Scale by 2.54.
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Re: DWG Files Not Scale Says Client

Postby Joe Wood » Fri Dec 22, 2017 11:46 pm

How do I scale the whole model, so I can export this dwg correctly?

I asked if he could scale on his end, and he said-
"This scale (1/2,54) does not exist, it is a scale of your drawing relative to the filling to the size of your screen.... or else it is: 1/1;1/2;1/5;1/5;1/10;1/20;1/25;1/50;1/100;1/150 Etc.............

But that doesn't change anything! whatever the chosen scale the measurements do not change since they are taken on the drawing at 1/1 scale which is the dimension of creation of your drawing. The scale is only used for viewing or printing."
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Re: DWG Files Not Scale Says Client

Postby pbacot » Sat Dec 23, 2017 12:21 am

You have to scale in the CAD version (not in terms of "drawing scale" but in terms of selecting everything and making it larger.)

I wish I understood what is happening.

Here's what. If I open in PowerCADD and just open it as feet and inches. It's OK if, after I make the file I THEN change the units to cm.

If I set the units as cm at import, the scale is off 2.54. then enlarging the drawing will give the correct scaling in cm.

Try this one that I resaved in cm.
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