Autocad LT Rotates Drawings on Startup

[cliff.davis]

This has been an ongoing and very frustrating problem for me. I will create a drawing and save it, then when i open it at a later date, the entire drawing has rotated 1-2 degrees. For example, I will draw a series of objects with 90 deg lines, save, then close the drawing. Upon reopening later, the lines are now 89.2 deg or something to that effect. This also occurs on opening drawings others have done that I open on my machine, including those done on earlier versions of LT. It happens randomly, so I have not found any pattern or time period. So far, I have not been able to fix a drawing and am usually forced to start over or correct hundreds of lines.

Anyone else having this problem? Is this a bug in the software? Am I unknowingly hitting some hot key or command that I am unaware of that rotates everthing? At the very least, does anyone know a quick way to rotate an entire drawing a fraction of a degree?

[john.vellek]

Hi @cliff.davis,

This is a new one on me! Is there a way to attach a file that this has happened to and then a version from backup as recent as possible before this occurs? I would like to take a look at both versions to see if there is anything obvious about why this might be happening

[pendean]

Either someone is messing with you, or your UCS is getting rotated, or you've been drawing at an angle the whole time because your crosshairs are rotated.
Show us a new file that you started where you drew at 0 and 90 degrees then opened it and it was skewed.

[cliff.davis]

I don't believe anyone would be messing with me, besides, everything on my computer is password protected.  As for drawing at an angle, the lines in question were drawn with the orthangonal setting on, and since the problem began I have always verified they are straight.

I'm thinking it has to the be the UCS rotating, but I'm not sure how that would have happened. is there a quick button for rotating UCS? I will work on finding a version with the error in it. The versions I currently have do not have it, the issue happens randomly.

[pendean]

Ortho being on does not mean you are drawing at 0 and 90 angles.

Show us a dwg with the problem and let's all have a look for ourselves.

[john.vellek]

Please attach a file when you see it occur again. If it is possible to attach the .bak or previous version of the file that might help to determine what is going on.

[john.vellek]

Hi cliff.davis,

Do you have any updates on this issue? Do you want to attach some files so I can take a look?

[cliff.davis]

I apologize for the extended wait, but the issue finally reoccurred. The isometric drawing here was started yesterday, and drawn at a 35 deg  in 2D (since Autocad Lite) and all vertical lines were originally done at 90 deg, with the "orthogonal" feature turned on. When I reopened the file, the UCS appeared rotated 0.382 deg. I'm trying to figure out if I accidentally clicked while pushing a hot key I'm not aware of or something that would have caused the entire drawing to rotate. I can draw new lines with "ortho" on and they come up correct, although out of alignment from the old ones.

[john.vellek · Accepted solution]

Hi @cliff.davis,

I opened your drawing and saw that the elements on the screen were rotated slightly. Then I zoomed extents and found some more items. They are not drawn quite correctly either.

So, a couple of things...did the angle precision gets increased? Did the SNAPANG get changed at some point? Is your original template file rotated in some fashion?

I can't think of a thing that would do this. Obviously it is easy to rotate back for all the entities that have been rotated uniformly.

[pendean · Accepted solution]

Any reason you cannot reset UCS and PLAN both back to WORLD? You should always be aware of your file's settings all the time.

AUDIT command also found errors in the file's database here and could use a serious PURGE too.

Is this a school / class project?

[john.vellek]

Hi @cliff.davis,

I am checking back to see if my post helped you with your problem. Please add a post with your results so other Forum users can benefit.

Please hit the Accept as Solution button if my post fully solves your issue or answers your question.

[cliff.davis]

Thank you for all your help. I'll try what you suggest. In this particular case, I had just begun drawing the project, and I removed a fair amount of data for confidentiality reasons so I could share with you. it much more frustrating in more complicated projects. I'm not in school, I am a professional engineer. but I started with a new company that required me to use Autocad for the first time 6 months ago. Since this was out of my degree field (Physics), this is the first time I've been exposed to the software and I am still learning. I appreciate all the advise you've given me.