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well first off im just thinking out loud but could you use like 2x4 box metal with like 1/8 inch wall to build a custom frame. would this metal be to stiff and not flex enough or would it be okay to take two sticks of this and build crossmembers and stuff and presto custom super strong chassis. i know nothing about building frames and stuff so i was just wondering
Scroll down 'till you see this...Style 3: Our other frame rails, for trucks, are constructed from 1/8" wall, 2" x 6" box tube. These are sculptured to have the same shape as the original frame rails. Again, not mandrel bent and forced into position. Shown below, is one of our 1953-56 Ford truck chassis.
cool im not thinking about building a frame or nuthin but useing box tube always seemed like it would be a lot easer than welding up out of plate. but now that i know it would be okay ill have to see on one of my next projects
First one ever from scratch. 2 x 4 .120 wall tubing. 2 x 3 bottom struts. 4 link rear. Custom bent rear frame rails. I hope it stays together. It looks heavy in the pictures but it's not. http://mysite.verizon.net/danbfl/dan...streetproject/
I am not an expert on frames and chassis design, but what I have read and been told it helps with frame twisting. I remember picking up the stock frame at one corner while it was on the jig and it would twist out of square. This is due to the fact it is riveted instead of being welded for the most part. But if you added just the welded x-member it would reduce this a lot. If you just ran a length of 2" round tube straight across from frame to frame and welded it in place solid, it would do the same also to some degree. This is how Ford and others are doing thier chassis now days. In short it just makes a more rigid/solid frame. This is good for heavy loads or high horsepower applications. But remember, too much stiffness and rigidity?? could lead to possible failure if you don't use the proper heat treated metal and proper welds (cracking and fractures). I am using friends who do build frames for advise so I hope mine stays together. I know a stock frame would not last long with 600 HP up front trying to make a screw cork out of the original frame.
Dan
Could you use like 2x4 box metal with like 1/8 inch wall to build a custom frame? Would this metal be too stiff and not flex enough?
I'm not aware of a frame for a car or truck (or motorcycle) that doesn't flex enough. The function of the frame is to provide attachment points for all of the suspension and powertrain components and to always keep them in the correct location in relation to each other.
In the old days, when someone drove down a cattle trail full of craters in a stock Model T Ford or a Model A, frame flex could provide the last foot or so of suspension travel. Today, driving on decent, paved roads, we want a smooth, quiet ride that's free of squeaks and rattles, and we don't want our door gaps changing. You can get away with a bit of torsional frame flex with an I-beam axle and a solid-axle rear end, but independent suspension is particularly incompatible with a flexing frame.
Contemporary frame design calls for any torsional flex to be minimized if not eliminated. Center X-members are a popular way to maintain the correct relationship of both frame rails as viewed from above.
What do you guys think about turn key custom roller frames? I have another 56 bw cab that I want to use to build a new truck some day. I think it is a great way to go to start off a project it is done and bolt on ready. I would think using a stock frame and then add all components, rear end, front & rear suspension etc., would be more cost effective.
I would like to hear if any of you have purchased any of these new frames like the ones mentioned above.
Is there a big difference from a stock frame verses a new reproduction frame?
What do you guys think about turn-key custom rolling chassis?
Providing you're getting a quality chassis with good engineering and quality components, that can be a good way to go with a street rod truck. For something traditional, especially with a relatively mild small block and solid axles, the original frame should be fine; especially in a panel truck as opposed to a pickup, since the panel truck body adds torsional rigidity.
Originally Posted by 1956bigwindow
Is there a big difference between a stock frame and a new reproduction frame?
One difference would be the boxed frame rails in an aftermarket frame. These new frames usually use fabricated frame rails, rather than die-stamped like the originals.
56 panel has the reason the original was designed to flex. A rigid frame would have bent permanently from the abuse, a 4 leafsprung suspension doesn't have enough travel to handle very rough terrain by itself. Similar reason a skyscraper's and bridges steel framework are riveted rather than welded. Note that the cab and sheetmetal were mounted to allow for that frame flex. A lot of torsional rigidity can be added simply by boxing the stock frame, basically turning it into a tube frame.
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