Drawing a 'open' Reducer

[kumararik]

I have got a reducer with a size of 4" to 3" dia and a lenght of 5". I need to open and draw its dimensions. I need the dimensions as highlighted in the sketch. Please help.  

[steven-g]

try here http://www.i-logic.com/conecalc.htm

[kumararik]

Thanks. How do I import a .dxt file into AutoCAD 2006 LT? I'm using http://www.sheetmetalguy.com/cones.htm sofware

[pendean]

DXFIN command if the format of the DXF is low enough for your LT version.