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Old 04-02-2012, 03:35 PM
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chassis design

hi


im designing my own chassis for my scratch build 34 roadster i want it to be a bit different in the way it look

ive attached a couple of pics so your comment would be good the main rails are 4x2 box section and the cross members are in 2x2 box section

the way i want to build it is to get rid of the rear section of the rails (the kick up) and use the cross member as the kick up with the body mounts for the rear of the car there will be a loop under the top member going down and bending back towards the main rail and welded up to the cross member and the chassis rails

the car is going to be a straight 6 cyl nothing fancy as this is going to be a budget build

on the safety aspect would this be ok as everything will be welded to the rear cross member and to the chassis rails
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Old 04-02-2012, 05:53 PM
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Do you plan on using a 34 Ford body or make something? The floor of the 34 Ford has a large curve to it with the center section being lower the front and rear.

Do you have the body?

Brian
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Old 04-02-2012, 06:20 PM
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You have an interesting idea, the rear section is a combination of cantilever and truss. Add veritcal cross (X) bracing top to bottom along each loop. It will look like a section of a bridge (side view), this will improve the strength of the cantilever component.

Also, the length of the lower loop section attaching to the main rail is a critical element. The welded section will have to support much more than the capacity of the 2x2 box, it also supports most of the additional capacity of the upper section of the truss. Possibly increase the shear strength of the welds holding the rear section to the main rail by extending the cross bracing along the loop onto the rail and welding the cross braces to the main rail where they overlap.

Using a free body diagram, you can determine the forces acting on the frame and model the structural design. Any first year engineering student should be able to research the material properties (strength in compression, shear, tension) and apply them to the model to determine load capacity, evaluate stress points, etc.
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Old 04-02-2012, 11:51 PM
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116" WB is pretty long for a '34. You'll need a kick-up near the front otherwise the front end will sit like an early gasser... nose high. maybe that's what you want?

The front section must also be narrowed otherwise you would have to have a very wide front track to be able to to turn the wheels without having them hit the frame rails.

Reinventing the wheel is fun but often you realize that proven designs are often the best.

You could build it like an TR3... http://britishheritagemotorsports.co..._for_sale.html

Last edited by Mojo56; 04-02-2012 at 11:57 PM.
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Old 04-03-2012, 04:25 AM
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chassis design

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Originally Posted by MARTINSR
Do you plan on using a 34 Ford body or make something? The floor of the 34 Ford has a large curve to it with the center section being lower the front and rear.

Do you have the body?

Brian
hi Brian

I'm making the body aswell as the chassis so i can really make it totally unique i want to make it look like a modern 34 i was designing the interior last night so here is a pic of the dash and center console you will have excuse the drawing my computer isnt that good and ive lost half my drawing programs
i dont know if it clear the whole dash will be curved inset with the clocks in the center should look pretty cool if it goes to plan

thanks for all the comments the more the better ive just bought all the material for the chassis
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Old 04-14-2012, 06:05 AM
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Hi, my name Mariano, sorry for my english. I from in Argentine, i´m building a ford 38 street rod (I try of build), but dont know what material use in chassis or frame. You using a tube whit a 0,01/ 0,02% of carbon or you using another material. Thanks for help
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Old 04-14-2012, 10:58 AM
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The square tubing obtained from the steelyard will be fine..most of that is a mild steel material for structural use..

Sam
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Old 04-18-2012, 04:09 PM
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Tanks Sam, I will be reporting shortly progress to make.
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