Page 12 - MetalForming September 2012

Tech Update
axially sliding locking bolt and a mechan- ical clamping gearbox. This design allows for high clamping forces and dynamic stiff- ness while keeping weight at a minimum. For tool changing, a vertical stroke is required. Model PKV is available in two versions: the fully automated pneumat- ically driven PKV-P and the manually operated PKV-M.
The Model PKH horizontal coupling, also available as a fully automated pneumatically driven model and as a manually operated model, also consists of active and passive tempered-steel parts, with a portion of the unit con- structed of aluminum. In the active part, clamping force is generated by the use of a vertically sliding clamping pin in com-
bination with a coupling pin in the pas- sive part.
The couplings feature patented force amplification via a wedge clamping design, and can compensate for a gap as large as 5 mm between the active and passive parts of the coupling.
GAM Enterprises: 847/649-2500; www.gamweb.com
Press-Type Spot Welder Tackles Resistance Welding of Aluminum
After struggling for years with incon- sistent welds produced by an under- sized rocker-arm spot welder, this 30- employee precision sheetmetal fabricator now is actively seeking work that involves the resistance-welding process.
“Our shop gained a whole new depart- ment due to the purchase of two heavy- duty spot welders,” says Greg Johnson, president of LJ Fabricators, Rockford, IL, who manages the family-owned compa-
ny with his brother Chris, vice president of operations.
“We don’t usually purchase equipment until there’s a need,” continues Greg, “and several years ago a customer pre- sented us with the opportunity to fabri- cate a large quantity of parts made of 0.050-in. aluminum. Our traditional method of gas-tungsten-arc welding of those parts would have been too slow and cost- ly, so we decided to spot weld them.”
When it became obvious to the John- son brothers that LJ’s light-duty 30-KVA rocker-arm spot welder would not handle aluminum, they looked to T. J. Snow Co., Chattanooga, TN, to provide a reman- ufactured press-type spot welder. T.J. Snow had converted the machine from its original AC transformer to a state-of- the-art mid-frequency direct-current (MFDC) transformer and control.
The high secondary-amperage out-
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7575 West Jefferson Boulevard Fort Wayne, Indiana (800) OMNI-789
10 MetalForming/September 2012 www.metalformingmagazine.com