Production Machining

AUG 2018

Production Machining - Your access to the precision machining industrial buyer.

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force must be reduced by about 20 percent, and for hard tool steels and cast irons, by about 40 to 50 percent. erefore, the workpiece can become a "choke point," limiting magnetic flux flow (part is too thin to transfer full magnetic flux from north to south poles). Or if the magnetic circuit is unbalanced (contact area with north polarity poles doesn't equal contact with south polarity poles), then flux density at the contact faces will be sub-optimal, and the part will become magnetic. Conversely, when correctly organized, a part being held on a magnet will be non-magnetic, and the chips will fly free. Often, this optimization involves reducing or manipulating contact area—counterintuitive, but true. Top Tooling Standard square pole chucks typically have tapped holes in the center of each magnetic pole for the attachment of "top tooling." ese are mild steel blocks that lift the part off the magnet face and provide positioning references that can manipulate the magnetic flux flow for optimal part clamping. ere are a variety of top tooling configura- tions that can be used to achieve optimum balanced flux balance and contact. Figures 1, 2 and 3 show examples of three types of top tooling in applications. Square-pole electro-permanent milling magnets offer exceptional possibilities for holding production parts. Simple top tooling allows the magnetism to be brought to the part even when the part is complex and can offer flexibility for families of parts with minimal change-over. Properly configured, the part will be non-magnetic and should fly free of the workpiece. For security, if there is a power failure, the part will stay put. e magnetic workholder is autonomous because the cable does not need to stay attached to pallets or indexers. For many applications, magnetics can be another arrow in the shop's workholding quiver. WEN Magnetics | 919-954-1004 | The optimal tools for your industry TM Contact your Carmex representative or visit New Ideas in Thread Turning HBA submicron grade Turning Inserts • Extra-fine submicron grade • High toughness for optimized performance on hardened steels up to 62HRc • Superior performance over an extended tool life External Thread Turning Toolholders with internal coolant • Two connecting options for direct coolant flow • Better chip control and chip flow • Reduces cutting edge temperature • Coating provides abrasive resistance BLU Grade Thread Turning Inserts • Submicron grade with PVD triple layer coating • High strength and high wear resistance • Excellent choice for threading stainless steel, Titanium, Inconel, and cast iron • Available in wide range of pitches and threads Visit us at Booth #431480 Standard square pole chucks typically have tapped holes in the center of each magnetic pole for the attachment of "top tooling." CONTRIBUTOR John Powell, Ph.D., is the president and CEO of WEN Technolog y Inc. WORKHOLDING 40 PRODUCTION MACHINING :: AUGUST 2018

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