How to bend
Chromoly Tubing
Bending Thin Wall Chromoly Tubing
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all right so they going to show you some
tricks on a Bailey RDB 250 preventing
some thin-wall chromoly sis for an
in-house project we're doing in an
updated roll cage for my personal
racecar it's a 25 5 update a lot of thin
wall chromoly in that spec this material
is inch and a half of 65 we're gonna be
bending it on a five and a half inch
radius which technically by the book
shouldn't work on this tight of a radius
but I'll show you a few tricks
that allow this to to work first of all
this is a brand new die so there's
plenty of pinch in the bronze insert
here the former die itself has a lot of
pinch in it as well so very little
weight on the die now that's a pretty
important part of this on top of that
we've got some high pressure bending
Lube in the counter bend die here and
then we're also going to clamp it to the
former die to prevent any slippage
this material has got a lot of spring
back in it as well
gonna make a 90-degree Bend and have
eight degrees of spring back programmed
into the machine
another key aspect here is to use a lot
of counter dive pressure to help force
that material to maintain its shape is
what it's going to want to do is wrinkle
on the inside of the bend and get very
flat on the outside without this counter
die pressure so
as you can see we ended up with a real
nice Bend very little bump at the will
to start in stop the bend and both the
inside wall and the outside wall are
nice and round it's no flattening and no
wrinkling
