Set Brace 1 (SB1)
When riveting with a partner, it is straight forward for the person
operating the rivet gun to use two
hands and hold the gun centered over the target rivet without allowing
unwanted movement. While it does take some practice, it is a skill that
can be learned by most anyone.
The task of holding the flush rivet set in place while riveting alone is a
bit more challenging. The basic mushroom flush rivet set
has a rubber outer ring that helps grip the target surface which attempts to minimize
unwanted motion. There is a limited amount of grip the rubber can provide, so there
is an ideal amount of pressure to be applied in order to reduce unwanted movement.
Press too hard and there is a risk of distorting the surrounding area, apply too
little pressure and there is a risk of the rivet not being held flush to the surface
or the set moving off the target area creating
even more metal distortion, especially if the set is allowed to drift to the point
where there is no longer any underlying structure. To compound the problem when
working alone is the need to also concentrate on correctly utilizing a bucking bar
at the same time which requires proper orientation and appropriate pressure itself.
The SB1 can all but eliminate the unwanted rivet gun movement, this allows the operator
to more easily apply a now wider range of acceptable applied pressure given the gun
is being securely held in place over the underlying structure.
This in turn helps improve the chances of producing better results
with less experience while allowing more mental concentration to be directed at the
use of the bucking bar.
While the SB1 was developed with single person riveting in mind, it
is also useful for the part time rivet gun operator
to improve the consistency of results and reducing the risks of unwanted
"events". Usage can therefore allow less experienced people to run the rivet
gun allowing you to draw on a larger pool of potential helpers. The SB1
can be of great benefit in these cases and especially where a slightly curved
surface exists making it even more challenging to hold the mushroom set in a
stable manner.
The dimensions of the SB1 have been targeted at assisting the builder
of a Vans Aircraft solid rivet RV aircraft using a 1.5 inch diameter swivel
mushroom set available from a large number of aircraft tool suppliers.
While meant for an RV kit, the SB1 is applicable to any application using the
same swivel mushroom set where rivet spacing is up to 1.5 inches. The 1.5 inch
rivet spacing limit is simply to ensure there are two clecos
available to act as clamping posts for the tool.
Operation of the SB1 is simple, it grips the adjacent two clecos to the
rivet being set by a quick turn of the built-in
clamp. The SB1 can be easily be loosened, slid the next location, and
retightened in seconds without any additional operation on clecos with
no regard to rivet spacing up to 1.5 inches. It doesn't take long to
realize the additional time required to use
the tool is small compared to the time saved by not having to drill out
the occasional poorly set rivet that may result from unwanted movement
of the mushroom set, not to mention the reduced risk of "smiles".
Even with varying skill levels and quality thresholds, it would be difficult
to not see a time improvement using the SB1 when it comes to the number of
rivets that have to be redone when working alone.
When doing rivets by yourself from a comfortable position, the existing
methods work fine with a little practice. The place this tool
really shines is when doing rivets at the extent of your reach and/or in
awkward positions. Once used on a regular basis however, it is hard not
to want to use it where ever possible just for the extra safety factor
in being able to do a precise operation even in instances of momentary
lapses of concentration. By making the task of stabilizing the rivet
gun easier, far more attention and concentration can be directed at
the bucking bar when solo riveting.
The SB1 itself is milled out of HDPE plastic producing a comfortable
and easy to use tool with low risk to scratching the surfaces it comes in
contact with during riveting. Being manufactured out of plastic also means
there is no dust being released during the high vibrational
loads of being in contact with a rivet gun. Prototypes were made
of wood, specifically MDF which is easy to prototype with, but the qualities
and durability were just not as good as HDPE.
After using this tool, and the numerous previous generations leading up to
the SB1, a wealth of experience has been gained in just how advantageous
the use of it can be. While all builders will develop their own
individual techniques, have a look at a few of the presented usage
tips that
can result in higher quality and less risky solo riveting.
|