Sharpening circular saws. How to sharpen a circular disk
Circular saw blades are made of high quality and strong metal, plates of various hard alloys are soldered on them.
The teeth have various shapes in terms of geometry:
- Straight tooth
- Oblique teeth.
- With trapezoidal teeth.
- The teeth are conical in shape.
You have acquired a circular saw and after some time the blade has become dull. And now you are wondering. how to sharpen a circular? Below we will try to just explain everything.
How to sharpen a saw blade
First of all, it must be borne in mind that basically the teeth wear out on the upper cutting edge, it is rounded during operation. The thickness of the rounded layer can reach from 0.1 to 0.4 mm, very quickly and the front edge of the edge surface becomes dull.
For correct and competent sharpening of a circular saw you will need: a special machine for sharpening and a pendulum protractor.
Correct sharpening of circular teeth with straight teeth is carried out in a plane located in front. For this purpose, the disk is installed in a mandrel located in a horizontal plane.
Then, using the adjustment screws installed on the tool sharpening equipment, you need to set the angle necessary for correct sharpening. The circular saw should move with the closest fit to the surface of the emery disk.
The thickness of the layer ground by an emery wheel is controlled by the force of pressing the saw blade against the abrasive. After sharpening the first tooth, the saw blade is retracted from the emery stone, rearranged one step and the actions continue in the same way until the sharpening of all carbide plates.
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Proper sharpening of the saw blade
Sharpening of circular disks with a beveled surface of brazing of carbide material is carried out along its rear plane and along the front. This method of sharpening differs from sharpening disks with a straight surface in that the saw must be positioned at an angle corresponding to the angle of inclination of the teeth.
To know how to sharpen a saw on a circular, carry out the following steps in stages:
- The required angle must be set using the pendulum goniometer;
- An angle with a positive value is immediately set: 6, 8, 10, etc.
- Sharpening the plate through one, going in a circle, you will have sharpened the first half of the plates, after this operation, the angle of inclination changes to the opposite, and the sharpening of the other half of the tooth plates begins.
The back of the soldered plates is much harder to grind, for this operation requires a special machine in which you can install a circular disk, so that when the back plane of the teeth of the disk is parallel to the plane of the emery stone.
Sharpening without a machine
Many are interested in the question. how to sharpen a saw on a circular without a special machine? If necessary and when there is no special equipment for sharpening disks, it can be sharpened using improvised tools.
How to grind for circular using an emery machine? For convenience, it is necessary to manufacture a device that will make it possible to fix the saw blade in the required position relative to the emery wheel mounted on the machine. For this purpose, you can use a conventional metal plate surface, which is located at the same level with the axis of the emery wheel.
A circular disk is placed on the plate and fixed in the desired plane to the surface. It can be fixed with the help of bolts that can be used to adjust the angle of inclination of the disk.
You can check the quality of sharpening done when examining sharpened plates, you need to visually inspect the surface, with proper sharpening there should be no chips, different cracks and there should be no glare on the surface of the sharpened places. Radii of curvature of the cutting edges should be in the range: 0, 010-0.014 mm.
Subject to all recommendations for the implementation of tool-grinding work, you can confidently work on a circular saw without replacing the saw blades with new ones. The newly sharpened cutting part of the discs will qualitatively cut the necessary materials and products without damaging their surfaces. That will allow you to significantly save money on the purchase of new discs.