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| October 18 , 2005 |
Your newsletter for tips on selecting manufacturing technology.
Online Product Demonstration
If you are considering a shop management and control solution, take a
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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.
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
Cimatron is hoping its program will help to improve the North American economy, combat unemployment, and promote higher standards in tooling design and manufacturing through the use of advanced technology. Participation in the program is open to qualified unemployed tooling professionals with industry knowledge and experience. For more information, visit www.cimatrontech.com/events/freetraining .
Coming in November: AMERICAN MACHINIST will focus on Machine Tools.
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