I have built a simple truss model in Solidworks 2014. When I got to the part to build my webs for the truss, I found that I can't extrude from 'surface' to 'surface' for the second web. However, I have already done it successfully for the first webs using 'surface' to 'surface' extrusion. I can do it successfully by choosing 'sketch plane' to 'surface' for the second web. I also know that SW provide weldment which can fullfil my task. I don't want to use weldment function provided by the SW as I want to control my data input in the equation.
Anybody have ideas about why it happens.