"z" ing a frame

I'm looking at Z ing the frame on my 31 Chevy roadster. I'm not sure how much of a cut, or "v" will result in how much "step"
Any help?

 

that depends on how fast you want the transition from one plane to another.

if you want it to slowly rise, its one measurement. if you want it to rise in a short distance, its another. there is no catch all angle

 

I need about a 6" rise and the rails are 5" give or take a fraction

 

Draw it out full size on cardboard.
Play with it until you are happy.

 

See, it would have been a good idea to pay attention in ninth grade plane geometry class.

 

Make a template out of some card board from the side of the frame rail, than cut it, v it etc.. until you figure out what works for you.

Alot easier to waste card board than waste a good frame!

 

well, you really didnt answer the question but what the hell.

slice it at 22.5* thats not too bad of an angle. not lazy, not overly aggressive.
add in enough tubing so that the top of the added tubing sits at your ideal height. should measure 9" from the top of the OG frame rail to the uppermost peak of the added tubing if my math is right... i'm slinging from the hip here on that number, but i think you get the point

building it out of cardboard, paper, old flooring vinyl... thats an even better idea. then once its right in 2D, make it outta steel.

any way you do it, remember...

fishplate fishplate fishplate.

 

Lot's of ways to skin this cat. Draw on a big piece of paper or the garage floor, your original rail. Then above it draw where you want it to be. Then draw the bit to join the two at any angle you like. Measure that angle.

Now make it.

Can't put it much simpler than that.

 

Card board is your friend. Trace out the side of the rail, put one straight cut from top to bottom (leaving like an 1/8th on the bottom to act as a hinge) Bend it to get the angle, "Z", Sweep that your after (whatever you want to call it).

Next draw a line where the cardboard overlaps itself. When you unbend it you'll have a little tri-angle that you can cut out and trace onto your frame letting you know how much to take out.

 

here ya go, from the last tech week, i like the carboard or chalk on the floor method but it's kinda neat to see the actual math involved finally: http://www.jalopyjournal.com/forum/showthread.php?t=296904 might help you in your endeavors. or not...
-ace

 

6".... pssshh.. you mean you want 16" !! j/k

Take Zombies advice.. the only thing I can add is to repeat the advice that was always told to me that sometimes I dont follow and end up with a peice too short or long... "Measure twice, cut once"

 

I cut it twice and it's still too short!

 

practice with some 2x4's or 2x3's and a miter box, sometimes it's easier to see a true 3 d thing that way

 

Are we still talking about frame rails...........