2-Low Temp Hot-Melt Glue Guns (craft store, about $4.00 each)
Colored Glue Sticks (two colors are sufficient, craft stores)
22 gauge Solid Wire (3 or 4 distinct Colors, electronics parts distributor)
Engineer's Ruler (triangular type with a "20" scale, art supply store)
Freeze Spray (available from electronics stores, use sparingly, its expensive)
1/8 inch Clear Heat Shrinkable Tubing (also from electronics stores in 6 foot lengths)
Fine Point permanent ink marker (supermarket)
Carpet thread (department store)
Wire Cutters (electronics or hardware store)
Christmas Ornament Hooks or Wire Paper Clips (Don't use your wire cutters on them!)
Lighter, alchohol burner or heat gun (for shrinking the tubing and smoothing out hot glue)
Parental Supervision if you are not an adult!
First, cut the wires to the proper length, 1/2 the length given for each
loop value (L1, L2, etc...). (See the note below.)
After cutting them you may wish to mark the wires at points 1/2, 1/3, 1/4,
or 1/6th of their length. Study the photo and number of
snap points
for the loop to determine where to place your marks. Most of the models
have large loops which need to be marked at half the wire length.
The joined ends of the wire will represent one of the marks.
By marking snap points on the wires before assembling them
it helps to insure your models will look right and not be all lopsided when
you're finished. It is usually not necessary to mark the smaller loops, as
long as you make them round and cut them to the right length, they should be
easy to fit symmetrically to the core structure
(providing the core structure isn't all lopsided.) There will be some error
in the models introduced by the diameter of the 22 gauge wires, so be expecting
the small loops to be just slightly undersized in most cases, because the equations
do not account for the cumulative error in the wire diameter. The strings in the
nucleus actually intersect, and so do not suffer this error, but its
impractical to intersect solid wires, so we have to settle for an approximation.
There are only one or two steps requiring the use of an open flame. When
forming the wire into loops, the ends of the wire are joined by slipping
1/4 to 1/2 inch of shrink tubing over the ends and heating it until it tightly
grips the wire (try not to burn the wire insulation). The loop equation
associated with each model tells you in advance how many loops of what size
you will need.
Note: The loop equations were written for classroom demonstration models made with 18 gauge wire at twice the size of the models in the photographs. Use the "20" scale on an Engineer's rule to scale the models by 1/2 for 22 gauge wire. Otherwise they'll be too big and floppy.
After making the loops for a model, study the photo's and start gluing them
together at their snap points. Use the Freeze Spray
to quickly set the hot-melt glue where you have tacked the loops together.
After tacking the wires in place with hot-melt, you will want to anchor them
by working a small amount of hot-melt around each wire crossing until it is
completely wrapped in glue. If you know which type of quark it is, you may
color code it with colored hot-melt at this point, or you can wait until the
model is finished and color code the quarks with a final layer of colored
hot-melt. (If you don't have colored glue sticks, I find it works just as
well to cut out small circles from colored construction paper and glue them
to the models with hot-melt. You can even label them "Up" and "Down" if you
want.) Pull off the glue strings (you know, those annoying cobwebs that the
glue gun strings all over the place) and warm the glue blobs briefly to smooth
their surfaces and melt the "cobwebs." (Don't touch or set the model down while
the glue blobs are still hot! Use the freeze spray if in doubt! Otherwise you
may glue it to yourself or the table!) Save pinning radical strings (P.V.B.'s)
until last, they can pin to any Up quark, but if you do it now, you won't be
able to change them.
Advanced modelers may wish to glue actual snap fasteners to the Up quarks so
they can detach and move pinned strings from one Up quark to another. I have
cut small squares from "Superlock Fasteners" (Radio Shack #64-2363) and glued
them to the Up quarks on the P5 shell so I could move the radical strings around.
It takes a bit of trial and error to make this technique work, you must remove
the sticky backing from the superlock squares and glue them so the hot
melt glue overlaps the top edge of the superlock square slightly. (Otherwise
they pull off too easily.) Also, the squares must be large enough to provide
a positive locking action. When removing pinned strings mounted thus, you must
carefully "break" them off near the fastener, as if you were breaking a stick.
If you just try to pull them straight off, you'll probably wind up bending
your model all out of shape. Most radical strings I just glue on, because I
need to know at a glance how many there are, not where they are. Chemists
will be much more interested in the actual pinning sites, I'm sure. For them,
pinning the strings should be done after the proton and neutron shells are
stacked, assuming they can generate a computer model to work with. After
you're done, attach a piece of carpet thread to the model and tie it to a
Christmas ornament hook (or a paper clip bent into a hook). Hang it up on
a wire and build another.
Its pretty easy to duplicate the shells I've modelled, and is actually fun once
you get going. There are many as yet undiscovered solution sets. If you want a
real challenge, study the shell models and the empirical laws
I used to model them, then try and find new solution sets. I didn't plan on going
past neon with glue-gun and wire modelling techniques, I'm kind of stymied by the
rapidly increasing complexity of the models as the quark count goes up. There are
probably more rules that I am not yet aware of. I will tell you one important
rule... No pre-quarks are allowed!
Pre-quarks are intersections of only two strings on the nuclear surface.
There must always be at least three string crossings, or none. This should
help a lot in eliminating false solution sets. If it turns out that this
system of nuclear geometry doesn't work (I'm pretty sure that it does, though),
then at least you'll have some really interesting ornaments to hang on your
Christmas tree! Have fun.