Tubeframe 914, Started work on my rear custom uprights |
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Tubeframe 914, Started work on my rear custom uprights |
FourBlades |
Oct 2 2010, 04:31 PM
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#2
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From Wreck to Rockin Group: Members Posts: 2,055 Joined: 3-December 07 From: Brevard, FL Member No.: 8,414 Region Association: South East States |
Do you position the jig attachment points to match your car or do you rely on factory measurements of where they are supposed to be? Do you weld up the attachment jigs with the end points bolted in place or do you build them off the jig and then bolt them on? Is the jig tig welded or mig welded? Thanks for posting this thread, it is teaching us all a lot. John |
Hontec |
Oct 2 2010, 05:03 PM
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#3
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I see things..... Group: Members Posts: 261 Joined: 23-September 10 From: Netherlands Member No.: 12,210 Region Association: Europe |
Do you position the jig attachment points to match your car or do you rely on factory measurements of where they are supposed to be? Do you weld up the attachment jigs with the end points bolted in place or do you build them off the jig and then bolt them on? Is the jig tig welded or mig welded? Thanks for posting this thread, it is teaching us all a lot. John Hello John I do a bit of both, I project every point on the jig and compare it to the other side. This results in a difference of 2mm which is well within limits for a car this age. Again; this car is exceptionally straight and has no major repairs done on it. The only thing that was repaired was the front end, it shows bad sheetmetal denting below the front trunk lock. Every line/gap on the car flows evenly and since the difference is so small, and I am building this rig for this car to be modified, I am extremely certain about this way of work. Everything is mig welded. I weld everything on the jig in it's intended position. I first completely spotweld the structure ( this helps minimize pulling and warping when welding) and then I fully weld every place I can reach, stil with the whole structure in place. After that I take the jig off and weld the hard to reach places ( very few in general) then I testfit again to the intended position( I wait to remove the jig until fully cooled down, so the metal will mostly return to it's intended shape) This method results in the least discrepancies when welding the jigs, naturally the metal tends to warp a tiny bit but after I place it back, I recheck the fit and if nescessary I adapt. Again, a minor offset is unavoidable but it is so small, it can all be corrected in setting up suspension. Try to measure your modern car, you will be shocked... When the chassis has been mediablasted, I will put her back on the rig, assemble every jig, install the roof and the doors, check everything again and after I am pleased, start cutting out the inner section. |
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