Welcome to the official website
Detailed Operation Instructions for Band Saws
2020-03-24
Familiar with the structure of machine tools
The technical specifications of band saws vary, but their structures are generally similar, and the working principle isMaterial processingUsed forBand sawsBasically the same, here we will introduce the structural characteristics of the MJ346A type machine.
The MJ346A fine woodworking band saw machine mainly consists of components such as the base (machine body), upper and lower saw wheels, work table, adjustment handwheel, saw gap, braking device, and motor. All transmission parts of the machine tool are sealed to ensure operational safety. The base, upper and lower saw wheels, and work table are all made of cast iron. Two saw wheels of the same diameter are installed above and below the machine body, with the upper saw wheel being adjustable up and down for loading and unloading the saw blade and adjusting the tension of the saw blade. The lower saw wheel is the driving wheel, driven by a pulley. To reduce wear and noise between the saw blade and the saw wheel, a layer of belt is wrapped around the edge of the saw wheel. The work table is directly mounted on the machine body, with a gap in the middle for the saw blade to pass through. The saw gap is attached to the left side of the table, and the work table can tilt at a 40-degree angle. To preventSawingfrom causing the saw blade to swing left and right, a saw clamp is installed below and above the table, with the lower saw clamp directly mounted below the work table and the upper saw clamp mounted on the machine body, which can move up and down. There is a pulley behind the upper saw clamp, which acts as a limit when the saw blade runs backward, preventing the saw blade from falling off. The machine adopts a centralized sawdust discharge method, ensuring cleanliness at the work site.SawdustThis ensures a clean working environment.
Replacing and adjusting the saw blade
To replace the saw blade, first open the upper and lower protective doors, loosen the sliding plate fixing screws, and turn the lifting handwheel to lower the upper saw wheel, loosening the saw blade. Remove the old saw blade and place the sharpened saw blade onto the upper and lower saw wheels, ensuring the sharp angle of the teeth faces downwards and does not flip upwards. Then turn the lifting handwheel to raise the upper saw wheel and tension the saw blade. Manually rotate the upper saw wheel to check if all the teeth are exposed on the outer side of the saw wheel edge. If not, adjust the upper saw wheel until the teeth are exposed at the edge, and ensure the saw blade moves smoothly along the edges of the upper and lower saw wheels and is perpendicular to the work table.
The saw blade tensioning device consists of two types: spring and weight (heavy hammer), and this machine uses a spring device. The tension should be determined based on the width, thickness, and speed of the saw blade. Generally, the tension is determined by pressing the saw blade with a finger, based on the left and right curvature of the saw blade. Under normal circumstances, when pressing the saw blade with a hand, the curvature should be between 3.2 to 6.4 millimeters.
The width of the saw blade should match the width of the saw wheel surface and should not exceed the wheel surface too much.
The saw blade is clamped between the saw clamps, and the bottom of the saw teeth should be aligned with the outer edge of the saw clamp. The saw blade should not be clamped too tightly; it should be able to slide in the saw clamp with a gap on both sides, approximately 0.04 to 0.08 millimeters. The back of the saw blade should be about 0.8 millimeters away from the pulley. If the saw blade touches the pulley while idling, it indicates that the saw blade is too far back, or the pulley is too far forward, or the saw blade tension is lost. Adjust the upper saw wheel or pulley, or remove the saw blade for inspection and adjustment.
Operating techniques
The band saw machine is generally operated manually. When cutting larger workpieces, two people should cooperate. When performing straight cuts, the upper hand should stabilize the workpiece, keeping it close to the saw gap, and push it forward horizontally. For long materials, the operator can slightly lift the end to ensure the back end of the workpiece does not drop below the table. The feeding speed should be controlled appropriately based on the material properties and the size of the workpiece, and sudden pushing or pulling and collisions with the saw blade are prohibited. When the workpiece is about 200 millimeters from the saw back, the lower hand can start pulling. When the back end of the workpiece is close to the saw teeth (200 millimeters), the upper hand should let go, allowing the lower hand to finish the cut. Do not feed the workpiece until the saw blade reaches the maximum speed after starting the machine to avoid sudden increases in motor load.
If a jam occurs during operation, the lower hand should forcefully separate the workpiece at the saw cut to the sides, and do not pull back to avoid dropping the saw blade. If the saw blade runs off or swings (the saw blade swings back and forth), stop the machine and check the saw blade, saw material, saw clamps, saw wheels, etc. Once the saw blade is operating normally, continue.SawingIf there are wood debris blocking the saw blade passage on the work table, use a wooden stick to clear it, and do not use fingers. To prevent resin sawdust from sticking to the saw blade and saw wheel surfaces, increasingSaw bladeand friction and resistance between the saw wheel, kerosene can be used for cleaning during work.
Cutting methods for several typical workpieces
1. Curved cutting methodSaw bladeThe narrower the saw blade,Sawingthe smaller the curve radius. According to experience: a 12 mm wide saw blade can cut curves with a radius of about 70 mm; a 25 mm wide saw blade can cut curves with a radius of about 250 mm; a 35 mm wide saw blade can cut curves with a radius of about 450 mm; a 50 mm wide saw blade can cut curves with a radius of about 800 mm. When using a wide saw blade to cut curves with a small radius, several radial cuts can be made first, and then cut along the curve.2. Straight inner corner cutting method When cutting right-angle corners, a round hole can be drilled at the corner first, and then cut in the direction indicated by the arrows in the diagram. If there is enough space at the corner, it can be cut directly.3. Curved material cutting method Cutting curved materials generally adopts the method of marking and cutting. It can also use a curved template for cutting, that is, place the curved template onto the saw gap and send the workpiece along with the curved template to cut out the corresponding curve. The degree of curvature of the material should match the width of the saw blade.
2．直内角锯割法 锯割直角形的转角时，可先在转角处钻一圆孔，然后按图的箭头方向进行锯割。转角转余地大时可直接锯割。
3．弯料锯割法 锯割弯料一般都采取划线锯割的方法。也可利用曲线靠模锯割，即将曲线模板上到锯比上，将被加工件巾着曲线模板送过去，就可锯出相应的曲线。材料的弯度大小与锯条的宽窄应配合适当。
4. Slope Sawing Method When sawing at an angle, the machine tool's workbench can be tilted to the desired angle. Alternatively, the machine's workbench can remain unadjusted, and a wedge-shaped wooden board with the corresponding slope can be fixed to the workbench. When the workpiece is fed along this wedge-shaped board, the required slope is sawed.
5. Tapered Sawing Method When sawing a workpiece that is larger on one end and smaller on the other, the method of using a template is often employed, which involves using a board that is slightly longer than the workpiece.Wooden boardFirstSawingForm the required slope,Plane all four sidessmoothly, to serve as a template. The template should not be too thick, with the small end kept around 10 millimeters, and then a wooden block is nailed to the large end of the template as a stop. When sawing, the workpiece is pressed against the template, and the template should be tightly adhered to the saw blade. Two templates should be made, to be used alternately front and back, to improve work efficiency.
Keyword:
Previous:
Related News
Request a Quote