FrontEngineDragsters.Org Forum
Technical => Roo Man's Room => Topic started by: beargeorge on May 19, 2016, 12:10:57 PM
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I am building an altered useing both the Mark Wiliams blueprint and the SFI chassis specs10.2 for6.00 =7.49seconds e.t..My question is the rear uprights that connects the bottom rail to the shoulder hoop the one that connects the rearend to the chassis.SFI calls for inch and a quarterx0..58 M.W.AA calls for inch and 3 eights x 095,which one do you guys prefer.
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10.1E calls out 1.375 x .083 wall.
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I use the 1.375 x .083 as a minimum. The altered frame that I currently have on the jig has 1.5 x .095 pressed into an oval configuration the same as Force uses on his funny cars. In fact I had Norm at JFR oval the tubing for me.
Roo
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Thank You, ROO
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Thank You Paul
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The Altered chassis I built last year got 1 1/2 X 120 wall, because it was in stock & 095 wasn't. I had used the same material on my FED when I built it. 058 never
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All set, i was able to get the 1.375x095 cm from Shapiro Steel,i still dont understand SFI calling for 1.250xo58.Thanks everyone for your help.
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Roo, I'm curious how it was ovalized. I recently had to duplicate a semi-streamline shape in some aluminium tubing for pylons for a FM antenna array for MD-500 helicopters; I made a die in an wire EDM that formed a tube into the desired shape with the help of a hydraulic press, is that how JFR does it? Any pics available?
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I have made round moly tubing oval in my press. I use spacers to prevent the tubing from collapsing in the center whenever I do this I do a couple of samples to figure out the correct thickness to press the moly to
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JFR have a flat die set up for their Trumpf CNC press brake and simply squeeze it in that. I presume that they have programmed the press stroke to end up with the desired result which is a tube with a 1.5" minor axis to match the frame rail diameter. The flat surface on the sides is only about 5/8" wide.
Roo
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Don Long started doing that many years ago for wing struts on alc. dragsters. Since the tubing was thinner than RE uprites, took a lot of testing on the material. Alloy comp. was a player (it needed % copper) and he dial indicated (because the tubing is not perfect) to index it in the press. I still have some of the rejected pieces(fractures) that I use to make decor tables and such