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Why Magnets?Work holding with magnets isn't just for surface grinding anymore. Advances in technology make permanent magnets a viable, economical alternative for the machining of ferrous materials. It might be the work holding solution your shop's been looking for. Using magnets to hold ferrous work pieces is an idea that goes way back. It makes sense to use the holding power of magnetism in place of torque vices, clamps, or expensive fixtures. But as a work holder, magnets never caught on much beyond surface grinding applications. Monroe/PMP is out to change the general perception about magnetic work holding for the modern machine shop. We believe magnetic work holding technology, in the form of permanent magnets, represents a viable alternative for many machining center operations. In general, a work holder needs to do two basic things: 1)-securely support a work piece and 2)- allow a tool access to areas of the work piece that need to be machined. Magnets accomplish both of these objectives. Pulling forces generated by magnets are uniform across their active areas so holding power is spread over the interface between work piece and magnet. Because the part is held only on the side contacting the magnet, all other sides are clear for machining. Another work holding consideration is getting consistent grip pressure on the work piece. Few shops use torque wrenches on vices or clamps, thus on pressure sensitive work pieces, the material can warp or flex. Magnets can be the ideal solution as they provide the same level of force consistently. Full support of the work piece also reduces machining induced vibration. Magnets themselves tend to have a damping effect on the work because they're holding the work over a relatively large contact area and act as a “sponge” helping to absorb the vibration created. Most users are able to run faster feeds and speeds without chatter using magnetic work holders which in turn benefits the user with increased production and reduced tool wear or breakage. |
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