12/26/01-- "The hardest part" isn't something that you can know until you've finished a project. Since I'm writing a running commentary, it's possible for me to erroneously christen a modification option as "the hardest part"; that is, until I run into something even harder! Well, this is one of those steps which I would be tempted to call "the hardest part."
This is unfortunate. Putting a working hatch on the kit is prerequisite
for modifications that rework the kit's interior for inserting a figure.
Even if you don't, it would be nice to have a working hatch to expose
the hatch underside and cockpit detailing. Without a working hatch, your
options are to display the hatch open using the faux hinge stick, or displaying
it closed with the hatch laying on top the cutout-- tip the figure and
the hatch slides off. Very uncool (and irritating).
Besides construction of the hinge, there are several other general issues
which make this difficult. The very first problem which you run into is
the poor fit of the hatch and the underside detailing. These are provided
as two separate pieces which, in the case of the SAFS (but not the Fireball
SG) are crudely molded with tons of excess material. This makes for a
lot of dicey grinding (without grinding through) to get the pieces thin
enough so they'll fit together AND fit in the hatch opening. You've gotta do this whether you make a working hinge or not.
The second difficulty is the thickness of the hatch "sandwich" and the
limited headroom in the cockpit. If you've fit the two hatch sections
together, the result is a fairly thick sandwich of parts. When you place
a head within the cockpit--depending on the particular head-- there's
a chance that there won't be enough clearance to close the hatch fully.
The insertable figure route should give you a little more leeway,
you'd think... But it doesn't. Depends on the figure, I suppose. The Cy
Girl can't be made shorter from the crotch to the head except by leaning
her back within the suit. Without the Max Steel helmet, there's enough
clearance for her to lean forward with the hatch sandwich closed. But
with the helmet on and the figure leaning forward, there isn't enough
clearance for the hatch detailing. As you can see, the fit is extremely
critical in a lot of areas, and the figure you choose can be extremely
important.
You can also see that a number of modification decisions are intertwined.
Even if you chose not to remove the padded deck, fitting a working hinge
would probably require some amount of cutting into that area. Because
I've gone the full blown route, I'm facing a number of decisions which
compromise Kow's design in one way or another. To accommodate the insertable
figure, I may have to abandon the padded deck concept and completely redesign
the interior so that it's figure-friendly. I also may have to redo the
hatch detailing in order to gain extra clearance-- probably by shaving
off the detail and gluing it to the hatch underside. These are decisions
I regret having to make since I'd rather have the conversion be faithful
to the original design. But my priority is to make the suit "work" (and
I like the Max Steel helmet); regrettably, some of the kewl aesthetic
things will be sacrificed to functionality.
So, what about the hinge? I decided to mount the hinge on the side rather
than the back because I thought I could do it and wanted to conform
to the original design, if possible. The brass hinge shown above could
be considered attempt #3. I first diddled around with using bent wire
with the underside detailing and got very frustrated. Hinges aren't really
that complicated, but in this case the clearance and fit requirements
called for something beyond a simple door hinge. That's where it gets
into the mysterious voodoo of parts design. I'm not a mechanical engineer
but instinctively, I knew that the hinge would require some kind of curved,
sliding component in order to keep it fairly unobtrusive. I mucked around
half-assedly, wondering how I was going to attach the lame contraptions
and ultimately gave up in disgust. You've got to be in the right frame
of mind to do this kind of thing.
My second attempt took a "just fuckin' work!" approach: a vinyl strap
superglued between the parts. This actually did work-- it allowed the
hatch to fit flush when closed and held it open at the proper angle. It
had one problem though: In closed position, if the hatch was bumped out
of its seal, it would slant diagonally. That's the problem with using
a vinyl strap-- it allows that sort of thing. But it's also partially
due to putting a downward sloping hinge on the side: Gravity pulls the
hatch and hinge forward and downward and it puts more strain on the back
of the hinge. So this called for a more rigid hinge. Even without this
problem though, the vinyl hinge was funky as hell, and I couldn't live
with it.
Attempt #3 was a "bite-the-bullet, cross-yer-fingers" attempt. I didn't
have the knowledge to scientifically design the pieces required, so I
eyeballed them and hoped for the best. I wouldn't know whether it worked
until I completely assembled and fit the hinge. I also knew that I wouldn't
have the patience to keep recreating and fitting these brass parts until
trial and error got it right. Fortunately, I got it right the first time
(or else this project might have drifted off into obscurity). The opening
and closure are good, the fit is okay (flexible vinyl presents some problems
for precision fitting) but the side mounting is still a bit of a problem
due to the slight amount of play in the way the hinges are attached to
the vinyl. That was its own separate problem.
Installing the hinge wasn't easy either, due to the limited access to
the tight area (in a way, like working on a car), the materials involved
and consideration of the appearance. Above all else though, the hinge
should be attached so that the hatch fits! This isn't easy when you can't
attach the hinge with the hatch closed. So there's a lot of finger crossing
when you commit to where you think the hinge should be.
The most secure way
to attach metal to vinyl is with screws. That worked for the lower attachment
because the screw could be fairly well hidden by the edge of the hatch,
open or closed. I didn't want to do this for the hatch attachment though
since there would be visible screws through the top of the hatch. For
that, I used a combination of contact cement and Zap-A-Gap. Zap-A-Gap
bonds well with vinyl, but only so-so with metal; shearing forces easily
pop the bond. Hopefully, the pliable contact cement (boot glue) will act
as a last line of defense. The "play" in the part actually comes from
the tentative, experimental means of attachment. I didn't know if I'd
get the positioning right so I drilled a single screw hole throught the
vinyl and hinge. The top attachement is designed so that the hatch could
be removed if necessary, without removing the entire hinge.
As I mentioned,
the closed position fit is only okay... trial and error construction
and flexible vinyl aren't the best formula for achieving a tight, precision
fit. (hey, pressing down on the hatch, it fits perfectly!) This might
be helped by the addition of a retaining flange on the opposite side,
since that would keep the hinge in better alignment. At the very least,
it would keep the hatch from falling open whenever the figure is tipped
from the vertical orientation (which happens a lot when you're working
on it). Of course, that's another functional divergence from the original
suit design.