My experiences reflect that of CBL - any construction lines were to be invisible or nearly so, and should not appear on the blueline copies. Lines were not to be used to connect views, be they construction or centerlines. I would use either a 5H or non-photo blue lead for layout work.
"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
I have, at various times, given my cheap 3D solid modelling program (sounds like Otto Kad) fits trying to develop fairly complex shapes. The same shapes were quite easy to define, draw, and communicate to a machinist using DG and a 2D CAD modeller (or, heck, coulda done it with a napkin and a straight edge too). DG is a useful tool, and not that hard to use once you get the idea. As a sometimes analyst, there is no better way sometimes to figger out the angles than by developing the true view from scratch...
