German bertram graf tools bertram graf models bertram graf prices

bertram graf tools powered by electric motors or electromagnets, driving the working head through a transmission mechanism, are called power tools. They are hand-held operating tools that use low-power electric motors or electromagnets as power sources to drive the working head via a transmission mechanism. Power tools are divided into handheld and portable types. Handheld power tools are more flexible, convenient, and widely used; many varieties have become essential tools for production and daily life. There are numerous power tool brands. According to their functions and applications, they are mainly classified into metal-cutting power tools, grinding power tools, assembly power tools, and railway power tools. Common power tools include electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete vibrators, and electric planers.

bertram graf tool description

Lifting tools vary in purpose and construction, but all feature a hoisting mechanism to perform the basic lifting and lowering action. Materials can be lifted and lowered suspended by flexible elements such as wire ropes or lifting chains, or jacked up by screws or other rigid components. Lifting tools are classified by structure into light small-scale lifting equipment, hoists, and overhead monorail systems. Light small-scale lifting equipment mainly includes lifting pulleys, slings, jacks, triangular chain blocks, electric hoists, and common winches. Most are compact, lightweight, and simple to use. Except for electric hoists, most are manually driven and suitable for less demanding tasks. They can be used individually or in combination. Some light small-scale lifting equipment has high lifting capacity; for example, hydraulic jacks have reached lifting capacities of 750 tons. Mine hoists and bucket elevators primarily perform vertical or near-vertical lifting movements along fixed paths. Overhead monorail systems form routes with rigid suspension rails, enabling material transport to various parts of a workshop and extending outside the workshop.

bertram graf tool precautions

Large saws are commonly used for thick and wide boards; small saws are used for narrow and thin stock. Coarse-toothed saws are often used for cross-cutting; fine-toothed saws are used for tenons and shoulders. Saws with greater set are required for hardwoods and wet wood, while saws with less set are used for softwoods and dry wood. When using saws, safe operating methods for each type must be observed: 1) Before using a frame saw, adjust the blade angle with the knob; conventionally, it should form an angle of 45° with the plane of the wooden frame. Tighten the tensioning cord with the toggle to keep the blade taut and straight. When starting the cut, hold the saw handle firmly with the right hand and place the left hand at the starting point, pushing and pulling gently. Do not apply excessive force. Do not twist the saw left or right during cutting. Apply downward pressure on the push stroke and lift lightly on the return stroke; maintain a uniform rhythm. Near the end of the cut, stabilize the piece being severed with your hand. After use, release the blade tension and hang the saw in a secure location. 2) When using a crosscut saw, apply balanced force with both hands to prevent the saw from drifting toward the side with greater force. Correct any deviation slowly to avoid binding or breaking the blade. 3) When using a coping saw, do not apply excessive force or pull too quickly, to avoid breaking the wire blade. During sawing, do not position your head above the upper end of the bow frame to prevent facial injury if the wire breaks. 4) Regularly check the sharpness of the blade and the stability of the saw frame and handle. Repair blades with dull or uneven teeth promptly. Repair or replace damaged cords, nuts, knobs, handles, or wooden frames before continuing use.

bertram graf tool operation

1) Single-phase power cords for mobile electric machinery and handheld power tools must use three-core flexible rubber cables; three-phase power cords must use four-core rubber cables. When wiring, the cable sheath must enter the equipment's junction box and be secured. 2) Before using power tools, inspect the following: no cracks or damage to the housing or handle; correct and secure connection of the protective earth or neutral wire; intact cables or flexible cords; intact plugs; normal, flexible, and undamaged switches; intact electrical protection devices; intact mechanical guards; and free-moving rotating parts. 3) The insulation resistance of power tools should be measured regularly using a megohmmeter rated at 500V. If the insulation resistance between live parts and the housing is less than 2M Ω, maintenance is required. 4) After repairing the electrical components of a power tool, insulation resistance measurement and dielectric strength testing must be performed. The test voltage is 380V, and the test duration is 1 minutes. 5) Electrical circuits for electric machinery and tools must have individual switches or sockets and be equipped with residual current-operated protective devices. Metal housings must be grounded. Connecting multiple devices to a single switch is strictly prohibited. 6) For current-type residual current protective devices, the rated residual operating current must not exceed 30mA, and the operating time must not exceed 0.1 seconds. For voltage-type residual current protective devices, the rated residual operating voltage must not exceed 36V. 7) Operating switches for motor-driven tools must be within easy reach of the operator. During breaks, at the end of shifts, or in case of sudden power failure during work, disconnect the power supply switch. 8) When using portable or mobile power tools, wear insulating gloves or stand on an insulating mat. When moving tools, do not carry them by the power cord or rotating parts. 9) When using Class III insulated power tools in damp or acid-containing environments, or inside metal containers, reliable insulation measures must be taken, and a dedicated supervisor must be present. The power tool switch must be located within easy reach of the supervisor. 10) The magnetic surface of magnetic base drills must be flat, clean, and rust-free. When performing side drilling or overhead drilling, measures must be taken to prevent the drill body from falling in case of power loss. 11) When using electric wrenches, ensure the reaction torque support is securely positioned and the nut is properly tightened before starting.

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