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Technology Factsheet

DeWalt Reciprocating Saw- DW309

Category: Dismantlement > Mechanical Cutting Equipment > Mechanical Saw
Reference # : Model No : DW309

The DeWalt reciprocating saw, model DW309, is a technology that uses an electrical power motor with a reciprocating system that forces a reciprocating saw blade to move up and down rapidly over a surface to be cut (FRP crate). Technical specs are 120-v; 50-60 Hz; 11.8 A; a load speed of 0-2,900 strokes per minute (spm); a speed range selector wheel, an adjustable shoe, a blade clamp release lever, and a speed trigger switch. The trigger switch or speed trigger adds versatility to the saw. The further the trigger is depressed, the higher the speed of the saw. To turn the tool off, the user only needs to release the trigger, and the saw automatically stops running after a few seconds. The speed range selector wheel controls the speed of the tool prior to use. The adjustable shoe adjusts to limit the depth of cut depending on blade length. The blade clamp release lever is a feature used to install and remove saw blades. This unit has different material capabilities (wood and metal) depending upon the type of blade selected and the metal to be cut (nails). This tool is considered very light (6.9 lbs.) and small in size (1’ 9” L x 4” W x 7” H). Reciprocating Saw Blade Description Two different types of blades were used during the glovebox FRP crate size reduction: DeWalt (DW4847) – This blade is classified as a bi-metal reciprocating saw blade for rough wood cutting. It is 6” long and has 5/8 teeth per inch (TPI) Lenox (20573-S656R) – This blade is classified as a reciprocating saw blade for wood and nails. It is used for general roughing-in work, nail-embedded wood, and fast cutting. It is 6” long and 5/8 teeth per inch (TPI)

Benefits

(1) Production rate is considered medium -high. It is good to have this saw as a supplementary cutting tool instead of main cutting tool during glovebox FRP crate size reduction. (2) The reciprocating saw is lightweight, which minimizes worker exposure to ergonomic problems due to tool weight. Operator fatigue is also reduced. (3) The tool is easy to set up, operate, and handle, and blades can be changed easily and rapidly (quick-change blade clamp). (4) The DeWalt reciprocating saw is easy to clean, and it is an inexpensive tool. (5) The DeWalt reciprocating saw in combination with the Lenox blade was able to cut through combinations of fiberglass, resin, plywood, and nails simultaneously. (6) Cutting activities are relatively safe for saw operators and environment, e.g., minimal risk for injuries, low personnel dose, and convenient spread of contamination. However, the heat transfer from tool to crate and operator must be cautiously considered while cutting activities occur. (7) Secondary waste generation is mainly fiberglass and wood sawdust and worn out or bent blades.

Limitations

(1) The DeWalt reciprocating saw reaches high temperatures easily. Heat transfer from saw blade to tool and from tool to operator is high. Tool reached temperatures up to 114 F. Cutting activities were frequently stopped because LANL technicians had to let this saw cool down before continuing cutting activities. (2) The cutting tool is strong for small jobs but not recommended for total segmentation of FRP crates. (3)LANL technicians found it difficult to perform straight cuts with this tool. Drawing a cutting line is recommended to mitigate this problem. (4) The reciprocating saw produced noise up to 105 decibels (dBA), which represents a potential noise hazard for operators. (5) Vibration level for the DeWalt reciprocating saw, measured in terms of velocity at the rear handle, was 0.870 in/s ec. (6) Vibration levels fall into the dangerous level, which represents a risk for workers regarding Hand/Arm Vibration Syndrome (HAVS).

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