Reciprocating Saw
Contents |
Description
The Skil Reciprocating Saw has removeable blades to cut materials ranging from wood to metal.
How It Works
The reciprocating saw runs off a 120 Volt, 8.5 Amp motor. At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism. The scotch yoke mechanism converts circular motion to linear motion. Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft. The linear motion is what moves the saw back and forth in its reciprocating motion.
Analysis in ANSYS yields a power output of about ¼ horsepower when cutting a medium sized log. As far as the power output is concerned there is not much as far as improvements. If a larger stoke was implemented, the time required to cut would be reduced significantly. However, a larger stoke implies a larger device which will increase material costs.
Parts
The table belows lists the Bill of Materials for the Reciprocating Saw:
| Part # | Part Name | Category # | Function | Material | Picture |
|---|---|---|---|---|---|
| 1 | Trigger | Switch | Control electrical signal | Plastic, copper wires |  |
| 2 | Variable speed control | Speed control | Control speed of blade | Plastic, copper wires |  |
| 3 | Insulated Bearing | Support Element | Allows rotation of motor | Steel |  |
| 4 | Motor | Input | Turns to drive gears | Copper wire, steel wire |  |
| 5 | Fan | Structural | Cools motor | Plastic |  |
| 6 | Bearing | Support element | Allows motor and spiral bevel gear to rotate | Steel |  |
| 7 | Spiral bevel gear | Transmission motion conversion | Changes direction of rotation from motor | Steel | |
| 8 | Brushes | Input | Electric signal causes motor rotation | Nickel, iron, cobalt |  |
| 9 | Shaft | Support element, motion conversion | Convert circular movement to linear | Stainless steel |  |
| 10 | Blade | Output | Cut | Stainless steel |  |
