An Electro Permanent Magnetic Chuck
for holding work pieces magnetically and/or mechanically.
Mangaslot is an invention necessitated by the growing demand for versatility in machine tool industry. Historically we have moved on from machine tools designed for a specific purpose viz. SPM, to machines tools which are universal in nature.
Development of magnetic beds has also moved on from permanent magnetic beds to electro magnetic beds and then to the EPM – Electro Permanent magnetic beds easing the comfort for instantaneous clamping independent of remaining ON with electric power. But the journey does not end here.
The inherent drawback of a magnetic bed comes to fore when the customer wants to mount a non magnetic material.The solution is to remove the magnetic bed and clamp other forms of clamping devices to the machine bed or clamp the secondary clamping device on to the magnetic bed.
Removing the magnetic bed frequently from the machine is not always easy and may lead to damage to the original machine bed.
Another drawback of any kind of existing magnetic bed is that the top surface is always made up of two different materials, either steel or aluminium/brass/stainless steel or epoxy.The dissimilar materials used at top surface leads to uneven thermal expansion during machining creating inaccuracy in the clamping face. Secondly if there is any crack in the non magnetic materials, seepage of external liquids takes place damaging the magnet.
To overcome such problems in the traditional magnetic beds and with an eye on versatility MAGNASLOT
Comparison between available EPM Chuk & MagnaSlot
Clamping of Ferrous Job
|can be clamped||can be clamped|
Clamping of Non-Ferrous Job
|To clamp remove the chuck and clamp job on the T-Slots of machine bed. Load additional clamping fixtures or vices.||Can be clamped using T-Slot directly.|
Accuracy of working face
|Due to heavy machining there is unequal heating of steel and epoxy resulting in inaccuracies and damage to surface||As the working face is made of single monolithic block of steel, inaccuracies due to unequal heating is reduced and there is no damage to the surface|
|When different materials are used in the top face, due to shock/ heat and damage there is a chance of seepage of coolant/ liquid into the chuck, which results in burning of coil. Repair of coil is difficult, as no repair can begin without first destroying the chuck.||Coolant seepage is eliminated as the working face is of a single block of steel, In the unlikely event of coil burning, it can be easily repaired, after removing the bottom plate, without destruction of the chuck itself.|