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October 18 , 2005 Your newsletter for tips on selecting manufacturing technology. |
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Online Product Demonstration
If you are considering a shop management and control solution, take a close look at the industry leader: JobBOSS. Click here to view a FREE 10-minute audio overview or interactive demo. If you have any questions, you can speak with a JobBOSS representative at 800-777-4334 Tips
on Selecting Shops that are preparing to buy new toolholders should keep four critical criteria in mind: Rigidity is achieved by at least 80 percent taper contact. Accuracy is determined by a maximum runout of 0.0002 inches total indicator runout (also known as TIR, a measure of the deviation between the surface of a rotating cylinder and a reference axis) at four times the diameter of the tool being held. Shank tolerances of ANSI standard AT-3 or better increase spindle-taper accuracy. Balance decreases vibration and chatter, and increases metal-removal rates, tool life and surface finishes. The quality of toolholders that use set screws or collets affects balance at high spindle speeds, and should consistently maintain a G 2.5 rating at the rated spindle speed. Gripping power is the holding power of the toolholder. Multipurpose, high-precision collets should have a wide clamping range with a 1-mm collapse. There has been an increasing trend toward HSK and shrinkfit toolholders because of their inherent rigidity and accuracy. HSK holders should meet required tolerances when a spindle is running at 40,000 rpm. Shrinkfit toolholders are expensive but they achieve rigidity at nearly the same levels as an integral shank tool, and at a lower cost and with greater flexibility than possible with an integral shank tool. Shrinkfit toolholders impose 10,000 pounds of gripping force on a tool shank, exceeding the gripping capabilities of collet, milling and hydraulic chucks. Shrinkfit tooling should be purchased from a supplier licensed by the original patent holder to ensure the product is manufactured to the correct standards; look for the high holding power and the extreme rigidity that are necessary for precise machining; ensure the toolholder is factory balanced to 15,000 rpm or better, and demand a TIR of 0.0002 inches or better.
Hot Products New Compact, Fast, 5X VMC with High Volumetric Accuracy Mitsui Seiki's Vertex 550-5X is the new machine with Mitsui's legendary precision, a compact footprint, ample work envelope for complex parts, and a competitive price.
The Rules of Manufacturing Have Changed.
Banner's EZ-SCREEN Guarding System guards areas and perimeters without a controller and starts at only $795.
Check it out Seco-Carboloy EasyShrink ® 20 Modular Shrinkfit System Available with or without stop rod height setting, in single or triple stations, air or water-cooled, and choice of rotary support. www.carboloy.com/epb .Manufacturing Education and Training Industrial Hydraulics, and Election Drives and Controls Coming in November: AMERICAN MACHINIST will focus on Machine Tools. |
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