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Micrometer Torque Wrench
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Scroll saw - Geological Drilling Rig manufacturer - Multifunctional Drilling Rig

Size
Scroll saws are referred to by throat. This is the distance from the blade to the rear frame of the saw, which determines how large of a piece of wood can be cut. The smaller saws have a throat of as little as twelve inches, while the larger commercial saws are approaching the thirty-inch mark. Industrial saws have been used before computer automation to make even larger objects by hanging the top mechanical linkage to a ceiling providing indefinite throats. Scroll saws vary in price from under a hundred dollars, to close to two thousand dollars. The more costly ones are generally much more accurate and easier to use, as the vibration in the machine is minimal. hello Uses
Scroll sawing is a very popular hobby for many woodworkers. The tool allows for a substantial amount of creativity and takes comparatively little space. In addition, many scroll saw projects that require little more than the saw itself, reducing the investment in tools. One main purpose for using a scroll saw is the ability to cut intricate curves and joints, very quickly, and with great accuracy. They can also be used to cut dovetail joints quickly, and are a common tool for thicker intarsia projects. Using a very fine blade, the saw kerf is all but invisible.
Scroll saws are comparatively safe meaning that children, under close adult supervision, can enjoy creating crafts, and realizing the pride generated when completing a mechanical task. Inadvertent contact between the blade and the operator's fingers is unlikely to result in serious injury. Mode of operation
There are different types of scroll saws. The most common design is the parallel arm in which a motor is attached near the back of the arms, and the two arms always remain parallel to each other. The C-arm has a solid "C" shape with the blade being mounted between the two ends of the "C". The parallel link, used by Excalibur and DeWalt, has rods in the upper and lower arms that are "pushed" by the motor to move short (about 4 inches 100 millimetres long) articulated arms and the end which hold the blade. The rigid arm scroll saw, which was very popular up until the 1970s, but is no longer made, has a single-piece cast iron frame. The blade is attached to a pitman arm on the bottom which pulls the blade down, and a spring in the upper arm pulls the blade back up again. This resulted in a significant weakness in that tension on the blade changed with every stroke of the blade. Modern scroll saws are all "constant tension" saws. Uncommon and larger industrial type scroll saws, included spring or vacuum sprung scroll saws, didn't have arms. Instead they had the reciprocation mechanism at one end of the blade and a tension device on the other to return the push stroke, their advantage being the tension/spring device could be hung from the ceiling of a building and large parts that otherwise could not be cut on arm-style scroll saws could be cut, e.g., aircraft frames of the past. This single-sided force of reciprocation had its advantages (speed, size of object) for rough work but had its limitations for delicate work. Blades
Hand-operated scroll saw, around 1900
Scroll saw blades come in many different types. With the exception of blades made for very light duty saws, typical blades are five inches long. The major types are:
Skip tooth (or single skip tooth) which has a tooth, a gap then another tooth;
Double skip tooth (two teeth, a gap then two teeth);
Crown or two-way which has teeth facing both up and down so it cuts on both the down-stroke (as with all other blades) and on the up-stroke;
Spiral blades which essentially are a regular flat blade which is twisted so that there are teeth sticking out on all sides.
Metal cutting blades using hardened steel;
Diamond blades (a wire coated with diamond bits) for cutting glass.
Blades come in many different sizes ranging from #10/0 for making jewelry (about the size of a coarse hair) to #12 which is like a small band saw blade.
There is also a variation called a reverse tooth blade. On reverse tooth blades, the bottom 3/4" of the teeth are reversed (point up). This helps reduce splintering on the edges of the bottom of the cut. It does not clear sawdust out of the cut as well, making the cutting slower, producing more heat in the blade which reduces blade life, and making burning of the cut more likely. Reverse tooth blades are especially useful when cutting softwood, and plywood such as Baltic birch plywood. External links
Scrollsaw Association of the World website
Craftsmanspace - Free scroll saw, marquetry, intarsia and fretwork patterns. Large free patterns collection.
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Antique tools  Halligan bar  Kelly tool  Ladder  Thau claw  Toolbox  Vise  Workbench Categories: Saws | Woodworking machinesHidden categories: Articles lacking sources from November 2009 | All articles lacking sources
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Buying and using a torque wrench?

I'm replacing the head gasket on my 95 Civic, and I do not own a torque wrench. I'll probably never really need one after this project, so I don't want to spend a lot. I need one that can torque as low as 84 in/lbs (7 ft/lbs), and will accept a 3/8 in. socket since I don't want to buy a new 1/4 in socket set.

Is the beam-type wrench okay for this job, or do I really need to spend the money for a micrometer wrench?

Will I still be on spec if I use a 2" extension on the socket?

well if you really think you'll never use it again then, why not rent one? They rent them at several places i know certain auto parts stores have "loner tool sets".

I'm willing to bet though you'll use it more than you think there's even torque specs to spark plugs and lug nuts for real. so don't cheap out (i did and ended up buying another one anyways). Get one similar to the micro torque from craftsman it has a dial type handle in the back with a clear window viewer and it's 3/8" you will not be sorry.

as for the extensions yeah you're still on spec (unless you use a "wobble fitting")

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This entry was posted on Sunday, June 17th, 2007 at 12:01 pm and is filed under Wrenches. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.