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The TUR-MN series lathes at Leaf Technology are equipped with the Siemens Manual Plus CNC package. According to the shop’s vice president, the conversational controls provide an easy and fast method for machinists such as David Schulz, shown here, to program short-run parts.
In 2008, family-owned machine shop Leaf Technology took an order for 12- by 14-foot shafts from a long-time customer in the mining industry. At the time, none of the company’s machines could accommodate work of that size, leading it to shop around for a larger, longer-bed CNC lathe. However, the machine it purchased—a TUR930MN Manual Plus CNC from Toolmex Machinery (Natick, Massachusetts)—wasn’t chosen just for extra capacity. Compared to performance estimates of similar machines the shop considered, the TUR930 could take 25 percent fewer passes per part and maintain tighter tolerances in heavy cuts.
"Prior to the purchase of the TUR930, about 5 percent of our business was repairing and machining parts for our customer in the mining industry," says Kevan Leaf, company vice president. "Now, we’ve been able to boost that to 35 percent. The customer liked what we were doing so much that it just kept giving us more and more."
The shop, which specializes in turned pump parts for customer applications ranging from refineries to power plants and water treatment facilities, was no stranger to the Toolmex product line when it purchased the TUR930. Among the various machines housed at its 10,000-square-foot facility in Hartland, Wisconsin are two 25-hp, TUR630 lathes measuring 25 by 80 inches between centers, as well as several TUR Manual lathes.
Mr. Leaf says he was initially attracted to the product line because of its flexibility—the Manual Plus CNC models can be run manually for single parts and in CNC mode for larger-volume jobs. Additionally, the machines’ Tri-V bedways provide the rigidity required to make tight-tolerance cuts in tough materials, such as high-nickel alloy or high-end stainless steel. "At tradeshows, everyone has pieces of aluminum in their lathes, but anything can look good cutting aluminum," he explains. "We knew that the Toolmex lathes could do more than that—they can and do handle the day-to-day abuses of tougher materials."
Also, the machines’ conversational CNCs enable the shop to meet what Mr. Leaf says is a significant challenge: managing costs while maximizing productivity in short-run work. "We need to build parts on the fly rather than having an engineer sit down, program a part and then run it," he explains. "That wouldn’t be cost-effective for us or enable us to get customers’ parts done on time."
Mr. Leaf adds that the TUR-MN Siemens Manual Plus CNC package common to all his Toolmex lathes provides flexibility for conversational, two-axis programming. He adds that the CNC is user-friendly and requires minimal G-code knowledge and experience, leading Leaf Technology machinists to prefer it to the shop’s other controls. Features include a range of cycles, easy-to-understand graphics, and constant surface speed (CSS) capability.
The CNC’s thread-repair cycles are especially useful, Mr. Leaf notes, adding that even taper threads are easy to repair. The shop’s machinists appreciate the control’s ability to easily pick up an old thread, as well as its auto-sync capability, which synchronizes the spindle with the machine axes. "To repair defective threads, whether on the part’s OD or ID, all we have to do is create a short program indicating where to start and stop threading, position the tool in the good part of the thread and make a few keystrokes."
Leaf Technology has also reduced waste and scrap materials. In the past, with its old technology, processes and equipment, the shop scrapped almost 6 percent of all material. With the Toolmex TUR-MN lathes, the shop has brought that figure down to just less than 2 percent.
Leaf Technology, Inc.
512 East Industrial Drive
Hartland, WI 53029