Senin, 20 Desember 2010

As Bend Wood


Bending wood is not the difficult task that it seems at first glance. Depending on the degree of curvature, and whether the bend is compound, there are two methods for bending wood.

First, you need a form to bend the wood around and clamp to hold the desired form. Most bent wood is a measure of "elastic", so you must build your form with an allowance for this purpose. And unfortunately there is no set formula for determining the degree of resilience that will produce a certain type of wood. Elastic is also affected by the folding method. This means that wood damped spring
or "develop" more than wood, is glued. Another variable is the type of glue used in laminating.

Generally, the tighter the curve, the higher the return spring wood, which makes the allocation of a matter of trial and error at best.

As the rolling of thin strip is the simplest method, we begin the process. The thickness of the finished project is to use a direct impact on the size of the bands, but generally, the heaviest use of the band is about ¼ "thick. Cornering You may need to with 8.1" or more thin bands, depending on the species. It is experimenting a lot, but I fear it is a necessary evil.

The form required for laminating can be as simple as a piece of pipe or as complex as a multi-station chain. I like to keep things as simple as possible.

When laminating thin strips, you can reduce stress and spring by soaking the strips before bending and pressing in the mold without sticking. Once they are dry, remove from the pan, spread the glue and re-clamp the mold. preventing Line pan with wax paper on layers of sticking to the mold.

When I dip the strips, I do it in an open container, and depending on the wood and the size of the strips, I soak for 15 minutes per night. I have to mix in a half cup of fabric softener per gallon of water. I find it almost soft wood and the fabric.

If the project is small and open time glue is not a factor, I'll stick to use poly-vinyl-acetate or aliphatic resin. If I need more time to work, I will use epoxy or resorcinol. I remain
away from the fast setting epoxy, but because they rarely heal if the games are slow. If you light wood, dry resorcinol a reddish color, which could questionable on a finished project to be used.

If you look like the pages of fine type of the guitar, the wood is usually left as above, but there is as hot bending jig, either electric or heated with a propane torch. brittle wood outside of the turn to avoid cracking with a thin stainless steel supports.

Green wood can be bent the same way, or by heating over hot coals or wood with a heat gun.

For projects in which the stratification is wrong, or when the wood must be bent compound curves, is a steam-box the answer. It may well be economically from PVC pipe, but must keep it to deform permanently to the tube.

The pipe ends must be sealed with a screw cap on at least one end to allow access inside. Connect to reduce the other end of the tube at a discount DWV, and add a radiator hose on the exhaust and a new gas is large enough to contain enough water to last through the work. Water can be heated with a hot plate or propane burner.

Drill pipe just below the middle into two or three locations and insert the wooden dowel to rest. Steam must be free to circulate the forest itself are penetration. A hole of about ½ inch in diameter should be drilled in the cap on steam
Entry for circulation. When you build the support structure for the steam box, the height of the box
to the input of steam to the condensate to the water supply back.

Rule of thumb says that wood should be 15 minutes per inch thickness are damped, but even here some experiments will be necessary.

The wood in the form must be brought as soon as possible, because the wood cools, it is difficult to bend. Make sure wood is at least two feet above the finished part, because it is almost impossible, a 3 / 4 "piece of wood that is less than a foot long, curved so that the foot is the last cut
when the wood is dry.

Secure timber to be safe, and leave it there until it has cooled completely. If you work with several pieces, place them in the steam box requires about the interval to put the item in the form and clamp, and remove it from the box in the same order.


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