Reciprocating Saw Machines

Reciprocating Saw Machines

Reciprocating Saw Machines --The reciprocating power saw is the original and least expensive saw for the cutting off operation. It is perhaps the most common power saw found in most production, tool room and maintenance departments. It is considered to be the simplest of all power sawing machines.

-The function of this saw is principally restricted to cut off operations. It is usually possible to position the stock so that multiple pieces may be simultaneously cut.

-Designs of reciprocating power saws vary from light duty crank driven machines to hydraulically driven heavy duty machines.

-The sawing action takes place in only one direction (on the forward or pull stroke), with the straight saw blade lifted slightly off the stock on the return stroke. Due to this action, the blade does not drag on the stock on the return stroke and thus avoids premature wear on the saw tooth.

-The power saw consists of

A bed or frame to support other machine parts,
A vice for rigidly clamping the stock,
A straight saw blade,
A blade holding frame,
A power mechanism for reciprocating the saw frame,
A feeding mechanism, and
A coolant supply system.

-Most of the light weight reciprocating saws use a gravity feed in which the blade is lowered on to the work by the weight of the saw frame. The depth of the feed is usually regulated by spring loading, by weights clamped to the frame, or by hydraulic mechanism.

The smaller hacksaws feed about 0'150 mm per stroke and the larger ones 0'150 to 0.75 mm per stroke. Feed pressures will be 200 to 340 kgf on the blades.

A-Coolant
B-Saw Blade
C-Vice
D-Round Stock

- The speed of power saws may be from 30 strokes per minute for large cuts with heavy saws on difficult materials, up to 165 strokes per minute on carbon steels and non-ferrous materials. The hacksaw usually has 4 to 6 different speeds available.

-Sawing capacity is expressed as the maximum diameter of metal bar capable of being cut. This is also known as the size of the power hacksaw. Typical sizes are 150x 150 mm to 600 x 600 mm. The motors used will vary from l. H.P. to 10 H.P.