| Wiring Blades |
| Written by Dave Neevel | |
| Sunday, 14 March 2004 | |
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Given that you can’t always count on an armorer to be present, willing and able to do that wiring job for you, it’s a good idea to learn how to take care of it yourself. Fortunately, there’s a little secret that we armorers sometimes don’t bother to reveal to the general public: the basic tasks of assembling and maintaining fencing weapons really aren’t terribly difficult.
There are an awful lot of constant facts of existence when it comes to fencing:
Given that you can’t always count on an armorer to be present, willing and able to do that wiring job for you, it’s a good idea to learn how to take care of it yourself. Fortunately, there’s a little secret that we armorers sometimes don’t bother to reveal to the general public: the basic tasks of assembling and maintaining fencing weapons really aren’t terribly difficult. With a handful of tools (many of which you probably already have) you can get the job done, even if you think of yourself as having no technical aptitude whatsoever. The great majority of the stuff you see armorers carrying about in our toolcases, and the tricks and trivia we have squirreled away in our heads, are really just labor-saving devices that speed up taking care of large quantities of equipment. This is a guide to carrying out the task of preparing, wiring, and assembling foils and epees. It’s not the first one written by any means—if you talk to a number of experienced armorers, you’ll find that all have their own, slightly different methods and tricks. The basics, though, are going to be the same no matter who is giving you advice. If you’re just starting out, the best way to ensure that you succeed is to take things slowly—even the best armorers can tell you about times when they bollixed things up by rushing to get a weapon ready. I’ll point out the most common ‘gotchas’ as they come up.
Always have the proper safety signs by your workbench. ToolsThe essential tools and supplies for wiring blades are:
Other useful tools or supplies are:
A little more detail on some of these items and their use: JigsA jig is a device that holds a blade bent while it is being wired and while the glue is drying. A non-portable jig can be made from a length of board by drilling an angled hole at one end for the tang to fit in and several angled holes at the other end, spaced between 60-70 cm from the tang-hole, for the point. The multiple holes for the point are there to accommodate different blade lengths, tang lengths, and different amounts of bend.
A portable jig can be made from a ~75 cm length of lightweight chain and pair of small copper pipe end-caps. Punch or drill a hole near the edge of the caps, bend open the link at each end of the chain and hook it through the hole in one of the caps, and then bend it shut. If you remove one link from the chain before attaching the pipe caps, you can loop it through one of the other links and bend the free end open to make a hook. You can then shorten the effective length of the chain by placing the hook through another link further down. There are a variety of other materials that can be used to make jigs. I’ve seen plastic film canisters tied together with strings, and even one made using a couple of spent 7.62 mm x 39 (i.e., AK-47) cartridges.
Acetone bathRemoving the existing wire and glue from the groove is the toughest, most tedious task in re-wiring a blade. An acetone bath will eliminate the bulk of the labor associated with stripping out the wire and glue. It is simply a standpipe filled with acetone into which you place the blade—the acetone will dissolve the glue, leaving a loose wire and a clean groove. The materials needed to make an acetone bath are a 3-foot (1 m) length of black pipe (1 ½ in or 4 cm diameter or greater) threaded at both ends, a 4-in end-threaded length of the same pipe, a threaded pipe connector, two threaded end-caps, and a tube of pipe-thread compound. All these items, as well as acetone, can be found on the shelf at a home-improvement or hardware store.
Acetone is easily as flammable as gasoline and even more volatile, so care needs to be taken to avoid spills and not leave any quantity open to air for long. Make sure you apply enough thread compound to prevent any leakage from the bottom of the standpipe, and keep the cap on except when inserting or removing blades.
Dremel ToolIf you glance into the toolcase of any armorer working at a NAC or National Championships, you are almost certain to spot a Dremel tool and a supply of cut-off wheels. There are a variety of uses for Dremels and the assorted bits available for them in the armory. The cut-off wheel is of particular utility in stripping out wires and glue from blades: it happens to be just the right width to fit neatly into a blade groove and scour it clean. Ideally, you’ll have been able to pull the wire out by hand, so you’ll just need to clean the residual glue out of the groove. If you can’t get the wire out, then you will be able to grind it away with the Dremel, though it will take more time.
GluesAnybody who spends much effort insisting that the particular glue they use to wire blades is the only one that will work properly is a) wrong, and b) probably in need of a life. So long as you’ve cleaned and prepared the blade well, just about any reasonable choice of glue (i.e., not paper or wood glues) will work fine. For the purpose of this how-to manual, I’m going to broadly divide glues into two categories: slow curing and fast curing. Slow curing glues include general-purpose cements (Duco, Cementit, Pliobond, etc.), specialty cements (such as fletching cement), and epoxies. What they have in common is that they require at least several hours (if not a full day) to cure, and they typically have a higher viscosity. These glues can be more forgiving to work with, since you have plenty of time to re-position or re-tension the wire before they solidify and, unless you are prone to prolonged episodes of narcolepsy, you shouldn't be at risk of gluing your fingers to the blade. Their viscosity means they won’t run where you don’t want them to. They also tend to retain more flexibility when cured. For beginners, I think a general-purpose cement is the best choice. Fletch-Tite, a fletching cement, has many qualities which work well for wiring blades (including remaining flexible when cured) but puts of a great deal of fumes when curing, requiring a well-ventilated work area. Fast curing glues are cyanoacrylates, a.k.a. superglues. They include the normal brands you’ll find at hardware and drug stores, and specialty brands like Pacer Zap and others, which are available from hobby supply stores. They all cure in a matter of seconds, which allows the blade to be used almost immediately, and have a low viscosity which allows them to easily flow in the groove. The curing time and fluidity do require some consideration when wiring, however. The specialty superglues are available in a different viscosities, ranging from almost water-thin, instant-cure glues (e.g. Zap CA) which dry in less than 5 seconds, to somewhat thicker ones which are better at filling in gaps. Fast cure glues tend to be more brittle when cured, although there is one formulation available (Pacer Flex-Zap) which has greater flexibility when cured. I myself use Zap CA for the majority of my wiring jobs. Preparing the Blade and PartsThere are a few steps to take with a blade before actually gluing the wire in- stripping/cleaning, placing any desired sets and bends in the blade, doing any grinding or filing that may be needed. The stripping and cleaning is one of the most important steps in a successful wiring job: a thoroughly clean groove is essential to ensuring that the glue will hold, far more so than the type of glue used. Stripping & Cleaning Wired Blades If the blade being worked on is previously wired, the first step is obviously to remove the old wire and glue. Using an acetone bath (the least labor-intensive method) or a Dremel tool with a cut-off wheel (the fastest method) have been described above. If neither is available to you, then you have two options: 1) do it by hand, or 2) have a lackey do it by hand, while you give instructions, supervise, and sip on a bit of Laphroaig (also known as the “thesis advisor and graduate student” approach). Even if option 2 is the route you choose, you’ll still need to know what to do in order to give able, sage advice to your underling between nips of Islay malt.
Cleaning New BladesEven new blades may need cleaning. It’s not uncommon for blades to be shipped with a coating of oil or grease from the forge (copious amounts of grease in the case of one Eastern European forge). Grease left in the groove will guarantee that the glue will not hold. Inspect a new blade to verify that the surface and groove are clean. Even if the groove appears clear, run a screwdriver down it to make sure. If there is grease on the blade, first wipe the surface of the blade clean with a paper towel. If you have an acetone bath, you may try soaking the blade for a few hours, but I find that acetone is not especially effective in removing grease. A Dremel cut-off wheel will do the job quickly. To clear the grease from the groove by hand, tear a small piece off from a paper towel and fold it over a few times. Using a small screwdriver, press the folded bit of towel into the groove at the tip and then run it down the blade. Wipe away the grease that get pushed out of the groove. This step will typically need to be repeated a number of times, using a fresh piece of paper towel each time, to get the groove clean. The threading at the tang and tip should also be cleaned of any grease. Mechanical Preparation (cutting, bending, filing, grinding) Once the blade is clean, you want to take care of any mechanical preparation that may be needed. Cutting the tang to fit the grip, if required, is typically the first item to take care of, followed by bending the tang to the desired cant. The complete hilt (guard, socket, and grip) should be test assembled before wiring to ensure everything fits. It’s not uncommon for the tang to be to wide for the grip to fit over just below the shoulder of the blade. If this is the case, that part of the tang will need to be filed or ground so that the grip will fit.
Point PartsThe last item to check are the point parts that will be used for the blade. The barrel, in particular, needs to be in good condition, since once it’s on it can’t be replaced without re-wiring the blade again. Closely inspect the barrel for any cracks, deformations, and dents that project into the interior wall of the barrel. A cracked barrel should be thrown out and replaced. An easy way to test for deformations is to insert a tip into the barrel and check that is slides smoothly up and down. An expanding mandrel is available for German-pattern foil and epee points, which may be able to repair a dented barrel (it will also work with French-pattern epee points). A 4.5-mm reamer can also be used to clear away dents in German foil barrels, but this removes metal and weakens the barrel, making it more appropriate as a ‘quick-fix’ for an already assembled weapon. A barrel that can’t be made completely smooth with the mandrel really should be replaced.
Wiring the BladeOnce the blade is cleaned and prepared, and we know the point parts are in good condition, it’s time to proceed with the wiring itself. Gently unfold the new wire and straighten it with your fingers. With epee wires, take care not to get the two wires twisted around each other. It’s a good idea to inspect the point-end of the wire to verify that the insulating cup is undamaged, the solder or crimps are secure, and (for epee) that the two contacts are of even height. Also check along the length of the wire(s) to make sure the insulation is intact. Lastly, testing the wire with an Ohmmeter or continuity tester can save you a lot of wasted effort in the event you have a defective wire. You should see less than 1 ohm with a new, factory-made wire.
How you proceed from here is dependent on whether you are using a slow-curing cement or a cyanoacrylate glue. Cements are generally too thick to flow around a wire that is already laid in the groove. You will need to place the cement in the groove before the wire goes in (this is called bottom gluing). With the wire held away, run a bead of glue down the length of the blade, completely filling the groove. Once the glue is in place, run the wire down into the groove, keeping it under gentle tension as you do so. The edge of a soft plastic dish scraper or a similar (non-metal) implement can be used to push the wire down into the groove without damaging the insulation. Once the wire is laid down in the groove, maintain tension and secure it to the tang with another piece of tape on top of the piece already wrapped around the tang. To prevent the loose end of the wire from getting in the way or being damaged, wrap it around the tang and tape it down. You may also wish to top glue the blade as well, running another bead of cement down the blade after the wire is in place, to ensure that it will be completely surrounded by glue in the groove. When done, use a paper towel to wipe away any excess glue on the surface of the blade. Leave the blade in the jig until the glue has fully cured—overnight is a safe bet on curing time. Particularly when using the super-thin, instant cure CAs, care needs to be taken to ensure that the glue doesn’t run into the point or bond the wrapped-up wire end to the tang. To glue a blade using CAs, Lay the wire in the groove of the bent blade, applying tension to ensure it fits tautly down in the groove, and tape the end of the wire down as described above. Tilt the blade so the point is elevated, and apply glue starting just below the barrel, going down about 15 cm (for thin CAs, just a few drops will easily run down this far). Then invert the blade and hold it upside down for 15-20 seconds or so. Inverting the blade ensures that any excess glue will collect at the middle of the blade instead of running all the way down to the tang. Once the first application of glue has set, hold the blade groove-up again, this time with the tang elevated. Now run glue 15-20 cm down from just below the tang (if the blade groove has an indentation to allow insulation tubing to run through the guard, leave that clear). Once again, invert the blade and wait 15-20 seconds for the glue to cure. Repeat the process for gluing the rest of the groove. A blade wired with an instant-cure CA may be assembled immediately, but I usually prefer to leave the blade for at least a few minutes to allow the glue to thoroughly cure. Still, you can see a chief advantage of CAs: the blade can be wired and the weapon built in one sitting. Assembling the Weapon
Once the glue has cured, the blade is ready to be mated to the hilt and point components to build the complete weapon. Remove the blade from the jig and inspect the groove to make sure that the wire is fully glued down. Any excess dried glue can be scraped away with a knife. Untape and unwrap the end of the wire from the tang. If you managed to glue part of the wire to the tang (among experienced armorers, there are those who admit to having done this at least a couple of times, and there are liars), gelled super-glue remover is ideal for freeing the wire. Once the grip is tightened down, it’s time attach the wire to the socket. Some prefer to attach the wire before mounting the grip, since it’s easier to get at the set screws or nuts. This certainly can work, but I prefer to have the socket held down securely for the task-- the right tools will allow you to get around the tight angles. Clip off the excess wire so there is just about 3 cm or so beyond the end of the tubing. Strip the insulation off of the wire end—the 30-gauge strippers mentioned in the Recommended Tools section are perfect for this. If you don’t have a small enough wire stripper, the cloth insulation can be unwrapped by hand and clipped away (there are typically two layers, wrapped in opposite directions), or removed with sandpaper. German wires have a layer of varnish on the wire itself that must be removed with emery paper—otherwise it will act as an insulator. Some people like to use a match or lighter to burn away the insulation, but this can make the wire brittle and prone to breaking at the socket. |