Cork Seat For Blow Torch Check Valve

Blow Off Cork

handle of the chisel should be held to one side so as to give an angling shear cut (see Art. 188, page 134).

271. Folding Edges and Forming Joints.—Frequently a hook or lock joint as illustrated in Fig. 239 can be used to advantage in making appliances of sheet metal. It is strong, easily made, and gives a neat, finished appearance to a piece of work.

To start a hook joint, the edge of the sheet metal is extended over the edge of a bench and bent down with a mallet or a hammer. The metal may also be clamped in a vise and bent, or it may be bent over the edge of an anvil, or a bar of iron clamped in a strong vise. After the edges are folded back, the parts are hooked together and hammered down in place with a mallet or a hammer. The joint is now ready for cleaning and fluxing if it is to be soldered.

272. Riveting Sheet Metal.—In making and repairing sheet-metal appliances, riveting can frequently be done to advantage. Locations for

Fig. 240.—A good way to put a rivet through sheet metal is to plaoe the rivet on. an anvil and drive the sheet metal down ovor the rivet with a rivet set, making the rivet, out. its own hole.

rivet holes majr be accurately marked with an awl or center punch; then the holes may be drilled or punched and the rivets inserted and hammered down. A better way, however, is to place the rivet on an anvil, or other solid piece of iron, such as a bar held in a heavy vise; and then drive the

Fig. 240.—A good way to put a rivet through sheet metal is to plaoe the rivet on. an anvil and drive the sheet metal down ovor the rivet with a rivet set, making the rivet, out. its own hole.

sheet metal down over the rivet with a rivet set, making the rivet cut its own hole. A rivet, set is essentially a small bar of steel with a hole drilled up into it to receive the end of the rivet, and with a cup-shaped depression for use in forming rounded heads on the rivets as they are hammered down.

A good way to punch holes in sheet metal is to use a solid punch over end-grain wood or over a block of lead.

Fio. 241.—A. In hammering down the end of the rivet, strike a few straight, modium-weight blows. Heavy blows or too many blows will cause the metal to stretch and buckle around the rivet.

B. The job may then be finished with the cuplike hollow in the rivet »et. (Courtesy. Stanley Tools. New Britain, Conn.)

In hammering down the end of a rivet, a few straight, medium-weight, blows should be used. Heavy blows or too many blows will cause the metal to stretch and buckle around the rivet. If a rivet starts to bend, it should be cut off and removed and a new one inserted.

THE GASOLINE BLOWTORCH

The gasoline blowtorch is not only useful for heating soldering irons but for many other jobs about the farm, such as heating a nut that is stuck on a bolt, warming the intake pipe on an engine on a cold morning, or thawing a frozen pump or water pipe.

Fuel is forced from the reservoir in the base of the torch to the burner on top by air pressure, which is supplied by a small hand-operated pump. The burner, after it is "generated" by heating, vaporizes the gasoline and mixes it with air in the proper proportions for burning.

Gasoline supply control valve

Cieanooi.

Gasoline gas ooflei and ,cleaner needle

Combustion

Stuffing box r-V

Pump assembly

Cieanooi.

Gasoline supply control valve

Diy Gasoline Torch

Priming cup

Filler funnel and plug

Fio. 242.—Details of a gasoline blowtorch.

Vaporizing chamber and Superheating veins

Priming cup

Fuel supply pipe

Filler funnel and plug

Fio. 242.—Details of a gasoline blowtorch.

273, Fuel for the Torch.—Ordinary, untreated motor gasoline is commonly used in blowtorches. Stove or lamp gasoline is better, however, as it is less likely to gum or clog the passages in the torch. Gasolines treated with lead should not be used because of their poisonous nature.

274. Operating the Torch.—The blowtorch is operated in the following manner:

1. Fili the fuel chamlxr with clean gasoline through the filler plug in the bottom. Only moderate pressure should be used in tightening the plug. If gasoline leaks around itf a little laundry soap rubbed on the threads will usually stop it.

2. Pump air into the chamber. Ten or twelve strokes of the pump will usually be enough if the pump ia in good condition.

3. FiU the 'priming cup by opening the control valve a little and placing the thumb over the end of the burner to deflect the gasoline down into the cup. Be careful not to let gasoline overflow onto the torch or bench. If it docs, wipe it up thoroughly before lighting.

4. Light the gasoline in the priming cup and protect the flame from any strong winds or drafts. It is essential that the burner be well heated to vaporize the gasoline.

5. Light the. torch by opening the control valve just before the gasoline in the priming cup burns out. Do not open the valve too soon. Give the burner time to heat. If necessary use a match, applying it to the air holes in the side of the burner and not at tho end of the burner.

6. To turn the torch out, turn the control valve just enough to stop tiie flow of gas, and no tighter. Screwing the valve too tight is likely to damage the scat. The sheath around the needle valve will contract when the torch cools, forcing the valve very tight against its seat, and possibly damaging the valve or the seat.

276. Blowtorch Troubles. Pump Troubles.—If the pump fails to pump air, it is due most likely to drying out of the pump leather. The remedy is to remove the pump plunger and oil the leather. It is a good plan to put a drop or two of oil on the leather once a week when the torch is used regularly. After the leather becomes worn it should be replaced with a new one.

Another common cause of pump trouble is improper action of the check valve on the bottom of the pump. The valve is usually made of cork and is held against its seat by small springs. If the valve becomes cracked, or if dirt prevents it from seating, the air in the torch will leak back through the pump and the plunger will not. stay down. Sometimes a check valve will stick shut and not open to admit air from the pump to the fuel chamber.

In case of trouble with the valve, tho pump should be removed and the valve examined. If only dirty, it may be readily cleaned; if it is cracked, a new piece of cork will have to be installed.

Gasoline Leaks.—Leaks around the threaded joints may be stopped by unscrewing them and applying common laundry soap to the threads. If gasoline leaks around the stuffing box of the control-valve stem, the valve should first be closed, and then the stuffing box nut tightened slightly with a wrench.

Torch Burns with Pulsating Red and Blue Flame.—If there is a strong pulsating flame, first red and then blue, the burner is not hot enough. Tho flame should be turned out and the priming cup refilled and the torch regenerated. The cup probably cannot be filled from the torch itself, and gasoline will have to be put in the cup with a squirt can. Sometimes a torch can be made to warm up by pointing the flame straight down against a concrete floor. The burner is thus heated so that it can better vaporize the gasoline.

Torch Burns with Weak Flame.—If the flame is weak and cannot be increased by opening the control valve further, then there is either (1) not enough air pressure in the chamber, or (2) the gasoline passages are partly clogged. More air should be pumped into the chamber. If this does not remedy the trouble, then it can be assumed that the control-valve orifice or some of the other gasoline passages are partly clogged.

If a small particle of carbon or dirt is lodged in the control-valve orifice, closing the valve and then opening it two or three times will usually dislodge the particle.

If this fails to remedy the trouble, it is likely that the fuel-supply tube or some of the passages in the vaporizing chamber are clogged with dirt, gum, or carbon, especially if the torch is old or has been in use a long time. Many torches have a cotton wick in the fuel-supply pipe to strain the gasoline and to prevent pulsation of the flame. After long use the wicldng may disintegrate or become clogged with dirt and have to be replaced.

If the passages are clogged, the torch should be taken apart very carefully and cleaned. Soaking the parts in kerosene, gasoline, or in alcohol will help to clean them. The passages may be blown out with air pressure or with a tire pump. Running small wires through the passages will sometimes help. Care should be exercised not to damage the small parts, particularly the control-valve orifice and the threaded plug?? and openings. All threads should be coated with laundry soap before reassembling.

Blowtorch Trouble Chart

Symptoms

Trouble

Remedy

Pump plunger will not stay down

Leaky or «tuck check valve on pump

Remove pump and repair valve

Pump will not pump air; plunger works up and down easily

Pump leather dry or worn

Oil leather or replace with new one

Torch burns with blue and red flame alternately and with pulsations

Torch not thoroughly generated before lighting

Refill priming cup and generate the burner again

Torch burns with weak, small (lame

Not enough air pressure in fuel reservoir; control-valve orificc clogged; or fuel passages clogged

Purnp more air into reservoir; close valve and reopen two or three times; or carefully take torch apart and clean, or send to factory for overhaul

Gasoline leaks around threaded joints

Threads do not fit perfectly

Take joints apart, coat threads with laundry soap and reassemble

Control valve hard to open

Valve turned too tight when torch was turned out

In turning out torch, screw valve just tight enough to stop flow of gas—no tighter

Woodworking Tools and Installation Tips

Woodworking Tools and Installation Tips

There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.

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Responses

  • Barbara Abend
    What do i need to build a blow gasoline torch?
    7 months ago
  • Kifle
    How a Gasoline blowtorch?
    8 days ago

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