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MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(9)

Practical Clamping Force: In practice this high clamping force is only ever realised when it is not needed(!), that is when bending thin steel workpieces. When bending non-ferrous workpieces the force will be less as shown in the graph above, and (a little curiously), it is also less when bending... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(8)

Magnabend Clamping Force: The graph below was obtained by experimental measurements, but it agrees fairly well with theoretical calculations. The clamping force can be mathematically calculated from this formula: F = force in Newtons B = magnetic flux density in Teslas A = area of poles in m2 µ... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(7)

Coil Cross-Sectional Area The cross sectional area available for the coil will determine the maximum amount of copper wire which can be fitted in. The area available should not be more than is needed, consistent with required ampere turns and power dissipation. Whatever coil space is provided in ... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(6)

Duty Cycle The concept of duty cycle is a very important aspect of the design of the electromagnet. If the design provides for more duty cycle than is needed then it is not optimum. More duty cycle inherently means that more copper wire will be needed (with consequent higher cost) and/or there wi... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(5)

How Many Ampere Turns are Needed? Steel exhibits a saturation magnetisation of about 2 Tesla and this sets a fundamental limit on how much clamping force can be obtained. From the above graph we see that the field strength required to get a flux density of 2 Tesla is about 20,000 ampere-turns pe... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(4)

The Coil The coil is what drives the magnetising flux thru the electromagnet. Its magnetising force is just the product of the number of turns (N) and the coil current (I). Thus: N = number of turns I = current in the windings. The appearance of “N” in the above formula leads to a co... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(3)

In this design the Front and Rear poles are separate pieces and are attached by bolts to the Core piece. Although in principle, it would be possible to machine a U-type magnet body from a single piece of steel, it would then not be possible to install the coil and thus the coil would have to be ... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(2)

Magnet Configuration Comparison: The E-type configuration is more efficient than the the U-type configuration. To understand why this is so consider the two drawings below. On the left is a cross-section of a U-type magnet and on the right is an E-type magnet that has been made by combining 2 of ... Read More

MAGNABEND – FUNDAMENTAL DESIGN CONSIDERATIONS(1)

Basic Magnet Design The Magnabend machine is designed as a powerful DC magnet with limited duty cycle. The machine consists of 3 basic parts: The magnet body which forms the base of the machine and contains the electro-magnet coil. The clamp bar which provides a path for magnetic flux between th... Read More

User Manual for models 2000E, 2500E, 3200E Magnetic sheet metal brake

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User Manual for Models 650E, 1000E, and 1250E Magnetic sheet metal brake

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Magnabend/JDC BEND/Magnetic sheet metal brake hinges

Magnabend/JDC BEND/Magnetic sheet metal brake hinges: Read More
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