AutoCAD 2010/2011/2012

AutoCAD 2010/2011/2012

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Member
jbattin83
Posts: 3
Registered: ‎09-08-2011
Message 1 of 6 (485 Views)

Limits of AutoCAD object size

485 Views, 5 Replies
10-01-2012 10:45 AM

What is the smallest object I can draw and "SEE" in AutoCAD? I was hoping to prove a point in my introductiory AutoCAD class, but it appears I have been lying!! I tried to draw a cirlce with a diameter of 1.24E-10m. The dot shows up, but I cannot zoom to it. I tried using an enormous zoom scale, but did not have any luck. I am almost positive my instructor introduced the capabilites of AutoCAD by drawing a full scale helium atom, and that was release 14. Is this still possible? Obviously the atom can be drawn, but what are the zoom limitations? Thanks.

*Expert Elite*
Alfred.NESWADBA
Posts: 9,607
Registered: ‎06-29-2007
Message 2 of 6 (475 Views)

Re: Limits of AutoCAD object size

10-01-2012 11:16 AM in reply to: jbattin83

Hi,

 

when yo udraw an atom (or parts of it) then set the UNITS of your drawing to anything else than meter. Set it to nanometer and you can create a circle then with 1.24E-01 (instead of 1.24E-10m) and a circle with 0.124 is visible and zoomable.

Alternativly also Ångström could be used for UNITS.

 

- alfred -

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Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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Distinguished Mentor
tschau3
Posts: 509
Registered: ‎10-04-2007
Message 3 of 6 (474 Views)

Re: Limits of AutoCAD object size

10-01-2012 11:18 AM in reply to: jbattin83

What happens when you do a ZOOM > Extents?  (assuming there is nothing else in your drawing).

Member
jbattin83
Posts: 3
Registered: ‎09-08-2011
Message 4 of 6 (467 Views)

Re: Limits of AutoCAD object size

10-01-2012 11:24 AM in reply to: tschau3

It doesn't do much! It ignores the object. I have tried regen, regenall, zoom by extents, zoom by center, and zoom by scale at each level of the zoom. They all get stuck with the same zoom message.

 

Member
jbattin83
Posts: 3
Registered: ‎09-08-2011
Message 5 of 6 (464 Views)

Re: Limits of AutoCAD object size

10-01-2012 11:30 AM in reply to: Alfred.NESWADBA

I have a feeling you may be right. I will do some more reading and circle back to you. If I use your method, even though the scientific units are "unitless", I feel as if I am not drawing to actual size. But in reality I am, just not the scale I want! Stupid rabbit hole. :smileyhappy:

*Expert Elite*
JGerth
Posts: 2,226
Registered: ‎12-05-2005
Message 6 of 6 (424 Views)

Re: Limits of AutoCAD object size

10-02-2012 10:55 AM in reply to: jbattin83

You are running into thelimitations of floating point arithmetic as implemented in compouters.  Check google for more information on 'floating point arithmetic'.  You just need to rethink what your units are, whether parsecs or angstroms is your choice, and a factor that determines how far you can zoom in or out.

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