Machine Tools-introduction of hand saw information

A hand saw is a tool with multiple fine points on a straight line with serrated teeth, which is used to cut sheets, feet, and wires. Here is the detailed information about hand saws.

Here is the content list:

l Hand saw tool composition

l The saw blade is different according to the nature and shape of the material and the method of operation

l Sawing operation

l Precautions when sawing

Hand saw tool composition

The tool used for sawing is a hand saw, which consists of a saw bow and a saw blade. The saw bow is used to install and tension the saw blade and is divided into fixed and adjustable. A Fixed saw bow can only install a saw blade: while the adjustable saw bow can install several lengths of the saw blade by adjusting the installation distance.

The saw blade is different according to the nature and shape of the material and the method of operation

The saw blade is made of carbon tool steel or alloy steel and is hardened by heat treatment. The common hand tool saw blade is 300mm long, 12mm wide and 0.8mm thick. Its role is to prevent the saw blade from being caught in the sawing slit when sawing, and at the same time, it can reduce the resistance of sawing and facilitate chip removal. The thickness of the saw teeth is by the number of teeth on the saw blade per 25mm length to say, 14 ~ 18 teeth for coarse teeth, 24 teeth for medium teeth, 32 teeth for fine teeth. The coarse tooth saw blade is used for processing soft material or thick material: medium-hard material use medium tooth saw blade: hard material or thin material sawing generally use a fine tooth saw blade.

Sawing operation

Workpiece clamping

The workpiece should be clamped in the left side of the vise, to facilitate the operation, while the workpiece out of the jaws of the part not too long, so as not to cause the workpiece to shake when sawing, workpiece clamping should be firm, to prevent the workpiece lose or make the saw blade broken.

Installation of the saw blade

Install the saw blade when the tension should be appropriate, too loose or too tight is easy to make the saw blade in sawing break. Because the hand saw tool is cutting when pushing forward, but not cutting when returning backward, so when installing the saw blade must ensure that the direction of the tooth tip is facing forward.

Start sawing

Start sawing is the beginning of the sawing work, the good or bad start sawing directly affects the quality of sawing.

Hand saw tool sawing way far side up and near the edge of the sawing two, in general, the far side of the sawing, because at this time the saw teeth are gradually cut into the material, not easy to be stuck, the method of starting sawing more square. Such as the use of near the edge of the starting saw, the master is not good, the saw teeth due to the sudden sawing into and deeper, easy to be workpiece edge card, or even broken or chipped teeth. No matter which starting sawing method is used, the starting sawing angle a to 15 ° is appropriate. If the starting sawing angle is today, the saw teeth are easy to be workpiece school edge card any: starting sawing angle is too small, it is not easy to cut into the material, the saw blade may also slip, the workpiece surface sawing badly. To make the starting position of the saw accurate and smooth, the left thumb can be used to block the saw blade from the position. When starting sawing pressure should be small, the round trip should be short, slow speed, so that the starting sawing flat.

Precautions when sawing

The saw blade should be installed with the appropriate tightness, hand sewing tools do not suddenly force too hard when sawing, to prevent the workpiece in the saw blade break from the saw on the bow crash out of injury.

Workpiece clamping to firmly, to avoid workpiece loosening, sawing slot skew, saw blade broken.

To often pay attention to the straightness of the saw seam, such as the discovery of skew should be corrected promptly. Skewed too many correction difficulties, can not guarantee the quality of sawing.

The workpiece will be sawed off when the pressure should be small, to avoid excessive pressure to avoid the sudden disconnection of the workpiece, the hand forward to cause accidents. The general workpiece will be sawed off with the left hand to hold the workpiece off part, so as not to fall and hurt the foot.

In the hand saw tool sawing steel parts, you can add some oil to reduce the friction between the saw blade and the workpiece, to improve the service life of the saw blade.

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