Hi Al, I do have some thoughts on how a good frame jig should be built. I had
some help when my Tiger had some sheet metal work done, saw it on it's frame
jig, and now I'm building a frame jig myself to make some similar body panel
repairs to my Pantera, also a monocoque car. In my opinion, a good frame jig
is first and foremost square and level to high degree of precision. I would
say within a 32nd of an inch across it's plane. Its footprint size should be
large enough that you can weld directly to the table or jig and build a
support for the car about anywhere, even to the outside of the body. I think
for me it will be about 12 inches larger than the car in each direction. I
will start by building a frame out if 2x4 or so .120 wall rectangular tubing,
with legs of the same material about 24 to 30 inches tall. The legs should be
triangulated and braced against flex it movement. Some would have a whole
other frame outline near the bottom of the legs and diagonal braces in each
side opening. The main thing a frame table or jig table needs to do is
obviously support the car and be stronger than the cars tendency to flex when
critical panels are removed it when heat is applied through welding to it.
Lastly, some will top the table with a thick plate, often 3/4 or even 1" thick
steel plate, and true it to the frame. This is hard because the cold rolled
steel plate will have a natural bow to it, and it will weigh a huge amount,
potentially a thousand pounds....but with welding it to the table properly you
can use a Porto power and such to true it up to tolerance. Lastly I would have
super heavy duty locking casters so you can roll it around. I will actual
have like 1" all thread threaded rod just to the inside of the legs that will
have feet that can adjust down lower than the casters to make it immobile and
also level the table. Off the floor.
That's how I would do it. I have a few images I created of one I built on a
computer model, and would be happy to send you if you like.
I have a few more thoughts but gotta run. Will chat again later.
Sent from my mobile...
On Dec 19, 2010, at 7:24 PM, Al Fudge <allfudge1635@gmail.com> wrote:
> All,
>
> The more I look at my Tiger the more I realize I'll need a frame jig to
> support the body as I make the repairs. Does anyone have any sources or
> ideas about the construction of a jig? I have a few thoughts about the
> construction of the jig and I have lots of time now to continue thinking as
> I just had rotator cuff surgery a few weeks ago. Any sources or thoughts
> about a frame jig are much appreciated.
>
> Al
> B9471635
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