Friday
Autocad, LayoutBeginning a drawing in AutoCAD: Model space and drawing units

Hello,
Dear Daily AutoCAD readers, previously I wrote an article named as Understanding Scale Concept and Drawing Units, and it includes some fundamental concepts necessary to be known before starting a new drawing in AutoCAD. I was very a popular article, so I decided to write a series of articles to explain these concepts that are essential for beginning a new drawing in AutoCAD. As drawing area, we have two options in AutoCAD. One of them is modelspace and the other one is paperspace
When AutoCAD is opened, first thing that appears on the screen in a part where “Command:” is written and some tabs as seen in Fig. 1. These tabs follow as Model/Layout 1/Layout 2. Unless you do something controversially, “Model” tab is active. Among the drawing areas that I mentioned above, first and the main one is this “ModelSpace”. Other area where you can make drawing is “Layout”, in other words what we call paper itself. Maybe just because some users can’t give up their traditional drawing with pencil and paper, they want to do the same with AutoCAD. However, first thing that you should learn is that you should prepare your drawings in ModelSpace. If we accept ModelSpace as our drawing environment in AutoCAD, then we can define our drawing as “model“.
After accepting the first rule of drawing as preparing the model in ModelSpace, then the second important thing in starting a new drawing is selecting the proper units. In ModelSpace there is no measurement reference like centimeters or inches on a ruler. Instead, there is the concept of “Drawing Unit” in ModelSpace, and you always draw with scale of 1 to 1 (If you don’t do it his way, you will have difficulty in scaling). Thus, if you draw a line that has a length of 5, its length will not be either 5 cm or 5 inches. You will have drawn a line with 5 drawing units. At this stage, what you have to decide is which dimensional unit you will assume as 1 drawing unit. For example, you are drawing in architectural discipline and you want to work at 1/100 detail (1/32” = 1’ 0”).
Most commonly accepted way of drawing in 1/100 scale is accepting 1 drawing unit = 1 cm ( For architectural format 1 drawing unit = 1 inch). This decision that you must give will affect all of the stages in drawing from dimensioning to taking sprint outs.
As a summary, you are not drawing with versatile and set-squares on paper anymore. After this time, you will prepare your model by a “drawing unit” that you assume in a space which includes all of your model. In the next article, I will explain units.
Have a nice day.
Viewed 19,260 times so far... This week: 137 Today: 21 Latest: 4 July 2009, 21:56Post Tags: Autocad, Layout, Model Space, Units
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May 8, 2007
Reply
hey…really i interested in tis articles..if tere’s no matter i wanna hae an autocad’s residentials project..(plans,elevations,sections) anyting like that…and i’d be so glad ..
thanks alot
Apr 1, 2008
Reply
I´m working in metric units, but occasionally I incert inches in my drawings, do you know how put Imperial units in a metric draw… just introducing ” or ‘ after a value?
Example: I’m in metric units, and I need to put a 3 inches line, so i just write 3″ in my command line when ask for the line value and voila! draw a 0.0762 line.
Some time ago, in my previus job i saw that… and i don’t have idea how activate it… do you know how?
Thanks and best regards!
Jul 3, 2008
Reply
Hello.
Well I do have a heavy load of questions, but I am going to start with the simplest one…Lets say that I want to draw an industrial warehouse, and I do have to draw both columns and connections, as well as details, so if my understanding of your previous article ( the one dealing with scales)..is correct and 1 drawing unit= 1 mm, if I have a structural column measuring 4.00 mts ( 4,000 mm), I´ll type a mline with a 4,000 input…but what about the text height….and also I have read the help files regarding the so called ” annotative” …But I still do not understand that concept at all..( Like if I am going to used it in modelspace or in paperspace…well ..
Thanks for your time in advance professor Toker
Jul 4, 2008
Reply
Dear Manolo,
You shoud detrrmine your text and dimension heights regarding to your layout (printout) material. Of course text heights will be different between A4 and A0 paper (due to scale). I’m using 5mm text height for 1:100 scale on A2 and bigger papers.
I think i’ll prepare another article for this subject.
Regards
Aug 15, 2008
Reply
Well thanx for answering my question, but well there´s another couple of questions…altough I´ve been reading several books related to autocad, when it comes to scale and units both dimensions and text…well I got very confused..but ok let´s get to the point…. I do have to print this out in 900 X 600 mm paper…I did draw the columns and the connections at the same scale ( in model space), but the details as well as the text related to this details must be bigger than the text and dimensions for both columns and connections ( or do I have to scale them all in paper space), so regarding of my regrets for not paying enough attention to my drafting classes several years ago when I was in college…can you give me any advice for this issue….
Again thank you very much in advance for your time again professor Orhan
Jan 17, 2009
Reply
Dear Orhan Toker,
Hope you be fine & well.
I am working as a Systems Engineer in designing Technical systems.
I dont know how to convert the dimensions from Inch. to CM or MM in the autocad drawings.
Please, help me in this regards.
Thanking you.
Regards,
Amin.
Jan 17, 2009
Reply
Simply Scale all objects with 2.51 multiplier.
Jan 17, 2009
Reply
Respected sir,
pls sent any Auto cad model drawings
Jan 20, 2009
Reply
hello
sir plz solve my a big problem plz sir i want when creat an a new atuocad 2006 drawings my quetison is below ” what’s creat a cetemeter drawings and shown your drawings units
Mar 21, 2009
Reply
Modelspace and scaling are the most important concepts any new autocad user should clearly and deeply undestand. Solid comprehension of this subject helps a newbie use autocad easier and faster. This is an excellent post.
May 3, 2009
Reply
i have autocad 2004 (sadly) how do i set up a scale for my drawing?
thanks
May 25, 2009
Reply
hi all,
am using AutoCAD 2002.
am a newbies in this autocad s/w, so really sorry if this question sound silly.
does anyone know how to scale 100 meters in real world into my drawing?
can u give me the step-by-step?
any help, thanks alot in advance.
May 26, 2009
Reply
Hello CADnoobies,
If you are accepting your drawing unit is “meters” please input 1 for 1 meter. E.g. let’s say you accepted 1 drawing unit is 1cm. You should enter 100 for 1m distance.
Four outputs: Autocad accepts 1 dwg unit=1mm on paper. To get 1/100 scaled printout:
Your 1 dwgunit = 1cm. 1m will be represented as 10mm on paper for 1/100 scale. You should set your output scale to (1=10) or (10/1).
Regards
Regards
May 26, 2009
Reply
orhan toker,
thanks so much for the reply.
i understand what u try to teach me..
but, can u send me the step how to set up / input the whole thing of this scaling?
i mean step-by-step?
thank you so much and hope u can help me since am just about 2 weeks using this software.
tq again.
May 27, 2009
Reply
anyone out there, can help me get the answer?
….=(
May 28, 2009
Reply
Hello CAD Noobies,
Please read this articles
http://www.dailyautocad.com/autocad-tutorial/#plot
You can find all about scaling.
May 29, 2009
Reply
I have a simple question, but unfortunately I really dont get it. Whenever I reaserch on the internet I just get a lot of imfor which I dont expect. here it is: (Explain how CAD commands can impact on drawing commands.) thankx
May 29, 2009
Reply
@Andy,
What do you mean with impacting drawing commands
Jun 18, 2009
Reply
sir i just wanna ask a question, when i open up autocad (is meter the default unit or it is unitless?) if yes what are the steps to convert it to minimeters…. though i could convert in ”options” but still when i put some dimension lines the value is still in meters…. can you help me?