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John Connor 
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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 Topic: loft and polyline
Posted: 03.Dec.2014 at 11:31 |
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I unioned the two solids for the sake of expediency.
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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philippe JOSEPH
Senior Member
Joined: 14.Mar.2011
Location: France
Using: AutoCAD Mechanical 2017
Status: Offline
Points: 1493
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Posted: 03.Dec.2014 at 07:18 |
John it's a very good result.
This will make me stop doing it during my work time !
I will have to explore the "Guide Options" that you are talking about LOFT because I don't know them.
About MASSPROP, in fact you don't have to UNION the solids to have the total, you just need to select the various solids and massprop will give you characteristics of the assembly, this may interresting if you have to work each solid separately or come back on the solids each separately.
In fact JoÄĹo needs the volume in m3 ( and the .dwg file ) and I'd also add the C.O.G. + at least 3 3D dimensions in X , Y , Z.
Again good job John.
Edited by philippe JOSEPH - 03.Dec.2014 at 07:24
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 17:53 |
 The finished product.
Edited by John Connor - 02.Dec.2014 at 17:54
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 17:27 |
 Success. Once again I created two polyline profiles (top and bottom perimeter) and lofted them. No need to use the Guides option either. At this point they just need to be unioned and MASSPROP run on the resultant solid. The second smaller section confused me at first until I realized the sides were slightly curved.
Edited by John Connor - 02.Dec.2014 at 17:27
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 17:19 |
 OK...this one is better. I used the Loft command along with the Guides option. Before lofting I drew a 3Dpolyline at each of the four corners starting from the bottom profile to the top profile. I think this one is a keeper. Now to figure out the best way to handle the remainder.
Edited by John Connor - 02.Dec.2014 at 17:27
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 17:10 |
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I think the above may be wrong. A closer look at your drawing reveals that the bottom and top linework that form the perimeter of the object are not lined up exactly. Extrude may not be the best command to use although I suspect that Loft will result in surfaces and not a solid.
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 16:50 |
 A big portion of your drawing created as a solid using the Extrude command. I'm not sure why you continue to create surfaces first. Please explain.
Edited by John Connor - 02.Dec.2014 at 16:51
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 14:17 |
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If you separate the large, almost square, area from the rest of the drawing you'll find that both the top and bottom polylines are indeed flat.
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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philippe JOSEPH
Senior Member
Joined: 14.Mar.2011
Location: France
Using: AutoCAD Mechanical 2017
Status: Offline
Points: 1493
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Posted: 02.Dec.2014 at 13:41 |
Yes John is wright.
Loft not predictable in his trajectories to create solids in that case.
I am taking a look at your 2nd file but it's difficult to create region to be extruded because the geometry is not 100% flat and after this the solids to add or remove are not so simple.
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John Connor
Senior Member
Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175
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Posted: 02.Dec.2014 at 12:53 |
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I'm not understanding why you resort to using LOFT to solve the problem. 95% of what you show could be created as a solid by simply using the Extrude or PressPull command.
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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>
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