thin wall extrudtion

[Palindrome]

I heed to create a thin wall extruding. If I remember correctly, our instructor used a polyline to draw a semicircle then offset it a small distance. Then applied a region or something, then extruded the two polylines upward into a hollow object. Can anyone help me duplicate this?


Palindrome

[f700es]

I heed to create a thin wall extruding. If I remember correctly, our instructor used a polyline to draw a semicircle then offset it a small distance. Then applied a region or something, then extruded the two polylines upward into a hollow object. Can anyone help me duplicate this?


Palindrome

You can draw a circle, draw a line from top quadrent to bottom guadrent and trim by this line.
http://picserver.student.utwente.nl/getpicture.php?id=340931

http://picserver.student.utwente.nl/getpicture.php?id=340934

The offset the curve a bit. I drew my circle at 3" and offset it by 1/4".
http://picserver.student.utwente.nl/getpicture.php?id=340935

Trim it up a bit and then you are ready to make a region (I guess you could have offset the circle 1st and then trimmed by the line only once but same result).
http://picserver.student.utwente.nl/getpicture.php?id=340944

Type REGION and select all objects and press enter. You now have a region ready to extrude. Hope this helps. :)