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Hello bavdeyka, can you still have the Solidwoks file or can you ask the other person to do a "save as .sat file with the good options" here shown. 
maybe if it has be done as a .step or not with the good options you will get surfaces and not solids.
Then you will have to rotate by -90Â° around Z ( OK with UCS world ) then rotate by +90Â° around Y ( set a special UCS for this ) your model to have it in AutoCAD with the same way as Solidworks.

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philippe JOSEPH Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1511	Topic: Can't perform boolean substraction Posted: 06.Mar.2015 at 14:11
	Hello bavdeyka, can you still have the Solidwoks file or can you ask the other person to do a "save as .sat file with the good options" here shown. maybe if it has be done as a .step or not with the good options you will get surfaces and not solids. Then you will have to rotate by -90Â° around Z ( OK with UCS world ) then rotate by +90Â° around Y ( set a special UCS for this ) your model to have it in AutoCAD with the same way as Solidworks.

John Connor Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 06.Mar.2015 at 13:00
	Can't you reproduce the 3D model in AutoCAD?
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

bavdeyka Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 31.Jul.2014 Location: Canada Using: AutoCAD2013 Status: Offline Points: 21	Posted: 06.Mar.2015 at 12:58
	This was created in Solidworks by another person. It won't substract even from primitive blocks, such as box. So I'm sure that the problem is in this model.

John Connor Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 06.Mar.2015 at 12:25
	What program was used to create the 3D model? What are you trying to extract from the model?
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

bavdeyka Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 31.Jul.2014 Location: Canada Using: AutoCAD2013 Status: Offline Points: 21	Posted: 06.Mar.2015 at 06:30
	I guess the first link is faulty, here's a download one: http://www.4shared.com/download/Ep01Sbdkba/mul_1_.dwg?lgfp=3000

bavdeyka Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 31.Jul.2014 Location: Canada Using: AutoCAD2013 Status: Offline Points: 21	Posted: 05.Mar.2015 at 23:08
	Please have a look at my model. I can't perform boolean substraction on it. Could you please prompt on what the problem is? http://www.4shared.com/photo/Ep01Sbdkba/mul_1_.html Edited by bavdeyka - 06.Mar.2015 at 12:31

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Can't perform boolean substraction

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