Subtracting error
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URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=9877
Printed Date: 03.Sep.2026 at 11:43
Topic: Subtracting error
Posted By: ConceptualReality
Subject: Subtracting error
Date Posted: 07.Dec.2013 at 23:28
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Hey, I am trying to subtract one object from another. However, when I try to do so, it tells me to trim it. So, I try to trim it, but it says: "1 not selected, not a valid object type." 1 Being the object that I want to trim with. The object (1) is an object that I made by creating a rectangle and extruding it. 
I hope someone can help me out, thanks for reading either way :)
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Replies:
Posted By: John Connor
Date Posted: 08.Dec.2013 at 11:59
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Attach a copy of the drawing to your next post and someone here will take a look at it. Which object is a surface and which a solid? You do know you can continue the operation by selecting the first (top) option don't you? ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: ConceptualReality
Date Posted: 08.Dec.2013 at 20:41
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Hi John, thanks for your message. I thought I added an image (I can see it, I guess others can't), anyway, I will try to again. The object I want a piece out of is a surface, the object that I will use to cut a piece out of the surface, is a solid. I used the "Insert image" button to hopefully let you show an image of the objects with the error message.
I tried to continue, but it doesn't do anything. |
Posted By: John Connor
Date Posted: 08.Dec.2013 at 21:40
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The first option "Continue subtracting the solid...." does work. I tried it myself. Attach a copy of the DWG file to the your post. Maybe you have some strange geometry but without the actual DWG I can't tell (a PDF doesn't help). ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: ConceptualReality
Date Posted: 09.Dec.2013 at 19:37
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Strange, I'll put the .dwg file in this message. uploads/428363/schaakstukken_recover.dwg" rel="nofollow - uploads/428363/schaakstukken_recover.dwg Thanks for you time :)
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Posted By: John Connor
Date Posted: 10.Dec.2013 at 11:39
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Thanks for the drawing. I was able to subtract the rectangle from the lofted surface just like I suggested. Here's the problem though. Since you created the bishop as a surface when you do the subtraction you see that it is hollow. Now, go get your chess set and a hack saw. Take out one of the bishops and saw a notch in the top of it. Is it hollow inside? Most likely not. But if it is it still has a thickness to it which your bishop does not. In my opinion your bishop should be a 3D solid and not a surface. One other thing. Apparently you must have had some trouble with this drawing because it has the word "recover" in the drawing name. Purge and audit the drawing. You might even want to first run the Overkill command on it too to clean it up. Then do a "saveas" under a new (normal) name. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: John Connor
Date Posted: 10.Dec.2013 at 11:45
 This is proof your bishop is hollow. I placed a sphere (color: red) inside. In my opinion all your chess pieces should be 3D solids. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: John Connor
Date Posted: 10.Dec.2013 at 13:27
 This is only a rough approximation. I don't have the time to make it exactly like yours. On the left is your bishop as a 3D solid. On the right I have sliced it in two and used the Color Faces command to highlight the interior in yellow. See...not hollow. BTW...the bishop was created by revolving a 2D profile consisting of joined polylines. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |