A cast removal device is a rotary power tool specifically used to remove cast aluminum, polycarbonate, brass, or thin-wall wood and plasterboard from the wall. Unlike a standard circular saw with a fixed blade, a cast saw utilizes a large, sharp, narrow-toothed saw blade that rapidly vibrates or oscillates back and forth on a very tiny angle to cut various materials. Furthermore, this tool may be used with an appropriate cast spreader for various sizes of materials.
The actual cutting procedure involves the initial adjustment of the saw's blade height to the appropriate level of the surface being cut. By raising the blade height appropriately, the kerf (the centerline of the cut) is closer to the surface being ground, reducing waste of material and reducing the need to rip back cast material to remove it. Blade height can be adjusted by changing the "kickback" or action of the blade as it rotates. Kickbacks occur when material deflects or moves off the cast's centerline and causes the blade to hit the work surface before or during the cut.
To fine-tune the operation of a blade, its teeth should be ground to fine grit or carbide. This produces a flatter surface for cutting and spreads the sharp edge across the metal instead of cutting the surface into the material. Fine-tipped teeth are easier to clean and maintain than sharp ones, especially when sharpening them oneself. It also allows the blade to make more straight cuts, reducing the need to compensate for a loss of accuracy by making a shallower cut at the front of the blade as it bites into the material. It also reduces heat buildup on the metal surface that may cause metal distortion... Read more