Join Date: Feb 2002
Location: N.W. Washington
i bent my tranny lines with a bender with markings like you describe. but i paid no regard to them, after doing a few test bends i found them to be basically useless (to me). you mention conduit, well, i'm an electrician and have bent miles of pipe it seems, from 1/2" up to 6", heavy wall and thin wall. i just bent my tubing like i was bending conduit. not sure what you are looking for as for using the marks, such as gain or deduct of a bend, etc, but if you know the angle of bend you want, and where you want to start it, it's real simple. i reccomend testing a few angles on a scrap piece first, mark where you start the bend (front of the bender "shoe"), then bend the angle you want, i.e 45, or 30 are most common. then mark the center of the bends, measure from the start mark, to the center of the bend, and you now know exactly where to start a bend on the bender, to have thre center of the bend where you want it on the pipe. bending offsets is easy too if you have the cosecant of the bend (or multiplier). with 90's do the same, mark the front of the bend at the shoe, bend it, then lay the back of the 90 flat, measure to your start mark, and the number you get will be your 90 degree deduct, or where you start the 90 on the bender to achieve the back of the 90 where you want it. this is actually way easier than bending say threaded steel ridgid conduit, since you need to lay out the bends first, then cut and thread the pipe, then do your bends, and keep the scrap pile to a minimum. i actually enjoy doing this aspect of my job, and it can get very challenging and complex. there is a book called "electricians guide to conduit bending", by richard cox, it's an excellent reference, with more info than most people will ever need, but its a cheap little handbook that would be worth getting if you have a good local bookstore. hopefully my description made sense to you, if not, just ask specifics and i'll try to explain. hope it helps [img]graemlins/thumbsup.gif[/img]
1968 rs with an old school 354" SB2.2 pump gas motor.
Repetition does not transform a lie into a truth.
Franklin D. Roosevelt