AutoCAD - Issue with Object Scaling on Copy/Paste Operation

[19stuberd]

Hello there! I have a bit of an interesting issue for those of you who might be interested in trying to solve it. A fast rundown of what I'm doing is I'm trying to make something with gears in it which autocad cannot make easily and so I went into a separate software (Vectorworks) and used its gear tool to generate the gear I need. I then exported the file as a .DWG file which I then opened in Autocad, copied, and pasted into my document. I made one gear in this fashion with no issues.

The problem I am facing now, though, is with a different size gear. I made a second gear in Vectorworks, exported as another file of the same type, opened it in Autocad, and paste it into my project and something VERY odd happens. The gear shrinks non-uniformly. Some more troubleshooting details:

-The gear is perfectly normal in the exported document. I created a circle of the nominal pitch diameter and overlaid it and the teeth extend beyond the circle, as they should. I then left this circle as a reference to see what scales right.

-Upon pasting into the destination document, the hub diameter stays the same, the aforementioned reference circle stays the same, but the gear's overall diameter SHRINKS such that it is now perfectly circumscribed by the circle. This is problematic because now the teeth will no longer mesh as intended.

-I have made sure the units are the same. One dissimilarity was that the exported document matched Vectorworks in using fractional inches, but I corrected that and then verified that the gear was still scaled correctly.

Any input on this issue is greatly appreciated as this has been driving me crazy. I'm sure I could do something else and that would be nice but I would ideally also like to know why this is happening. Thanks in advance! 

[ The subject line of this post has been edited to include the product name by @handjonathan ]

[19stuberd]

It seems that when I paste it into a fresh file it works fine. I'm assuming this means it's an issue with the block name, but I can't figure out how to edit the name of a block or delete one, and I am trying.

[whitney_jeff]

if you google "gear drawing routines in autocad" there are several solutions, and even some routines you can download

[whitney_jeff]

in your gear2-5 drawing there were only 2 blocks to worry about - gear3d and gear3d-1 - rename gear3d-1 to something else (use the rename command) - name it to something completely different

[19stuberd]

Got it, sorry. I was in the design center and block editor (you know, the place where you go to EDIT BLOCKS) and there was no apparent option to rename it in either place, including a greyed out name parameter that could not be directly edited like the fields above and below it. I guess Autodesk decided making a separate command and calling it "rename" made the most sense. I also don't see a way to delete the blocks from either place, I'm sure I'm looking in the wrong place and one of you will inform me that I should have used some random command called "deleteblock" or something that I just don't know about. Thanks for the help nonetheless!

[whitney_jeff]

Well . . .  no.  You have to find and erase all the blocks with the same name, and then use the Purge command to get rid of the  actual block definition.  There are a couple of ways to find all instances of the block and erase them at once but not easy to explain.

Look up qselect and filters

[whitney_jeff]

Following up - did you get things sorted out?

For sure you know a little more AutoCAD than you did before! LOL