Recent content by evilbrent

Ok, I'll see how I go. Thanks a lot.

oh, ok, yes. Sorry engineering maths was a decade ago for me. It's amazing how quickly the knowledge vanishes. I reduced the original equation down to 0=-71.5x^2+900x-2628 and got 0=(x-4.604)*(x-7.984)

Hi, I'm an engineer designing a spring system for a garage roller door. I need to know the number of turns of the door for all the size combinations. I've found this page which gives a good equation for finding the length if you know the number of turns, starting radius and gap between...

um... I haven't done this in a while so forgive me for being simple... but that's not an equation. if you put x=10 you end up with the equation 122=900, which isn't true. There's been some kind of mistake.