Bending Oval Tube.........
Bending Oval Tube.........
(OP)
Does anyone out there know how to bend oval tube. i am considering using it on a frame and wondering if i can use the old fill with sand and heat method or should i pay someone to do it for me. thanks





RE: Bending Oval Tube.........
Rod
RE: Bending Oval Tube.........
RE: Bending Oval Tube.........
Locate in the tube at the bend location a piece of (rectangular cross section) wood - locating with string if it is deep in the tube.
When the tube crushing occurs the minimum "diameter" tube collapse will be the thickness of the wood.
Abandon the wood in place if you can't get it out.
RE: Bending Oval Tube.........
RE: Bending Oval Tube.........
is it possible to get round tube bent, then to compess it to the appropriate oval?
if the compression was done in a steel jig so that the extents of the jig were "sloppy" to start with then as the tube deformed the widths of the jig set the longer dimension of the oval it should work ok.
we found getting mandrel bends done cost AUS$15 a bend in newcastle (not at an exhaust shop, but with a proper mandrel bending place). and only took a day (dropped off, picked up)
the only problems are that the bend radius would have to be at whatever their die was and obviously this method could take a bit to set-up
what u think?
RE: Bending Oval Tube.........
AM IN AUSTRALIA - SEEMS LIKE THIS COUNTRY HAS LOTS OF BUDDING ENGINEERS WILLING TO TRY JUST ABOUT ANYTHING !
AM OLD AIRPLANE ENGINEER/ELECO - BUT ALSO OVERHAUL / REFURB OLD MOTOR CYCLES FOR HOBBY - MANY YEARS AGO WHEN I WAS DOING INSTALLATIONS OF PVC TUBE - WE USED LONG SPRINGS + LENGTH OF WIRE PRIOR TO BENDING WITH SOME HEAT - I WONDER WOULD THAT WORK ON OVAL TUBE - I PRESUME YOU MEAN STEEL ? PROBLEM MIGHT B ETO GET IT OUT AGAIN - YOU DONT SAY WAHT O.D. /I.D. OR WALL THICKNESS OR MATERIAL SPEC. ?
FURTHER BACK I WATCHED THE GUYS ON RADIAL ENGINES FILLING ALUMINIUM ALLOY HYDRAULIC PIPES WITH FINE SAND AND PATTING WITH TABLE TENNIS BATS TO ENSURE THE PIPE WAS PACKED SOLID -THEN HEATING WITH BLOW TORCH AND FINALLY BENDING AROUND TIMBER MOLDS . REMEMBER THE TUBE NOT ONLY CAN WRINKLE ON THE INSIDE OF THE BEND -IT ALSO WILL STRETCH THINNER ON THE OUTSIDE SO IS WEAKER THERE - STRUCTURAL INTEGRITY MAY SUFFER - ALSO CORROSION PROFF THE INSIDE BEFORE WELDING ETC. BMW R-60 FRAME ETC IS BUILT WITH OVAL AND ALSO TAPER STEEL TUBE - TRUST THAT HELPS - J.C.
RE: Bending Oval Tube.........