VTC Revitalized with New CNC, AC Servos

VTC Revitalized with New CNC, AC Servos

Retrofit ends downtime caused by region's chronic power lapses, common CNC simplifies programming, and new AC power improves reliability and serviceability

A significant percentage of Helac's parts pass across the shop’s MAG VTC: a 36-inch, fixed-height, 2-axis machine that was sensitive to power outages.
Retrofitting an older MAG VTC with a new Fanuc 0iTD CNC, AC spindle, servo drives, and motors ended recurring problems caused by regional power outages. Commonality with other Fanuc controls in the shop improved programming efficiencies and training.
Helac's MAG VTC does heavy metal removal on the tube-shaped housings used for many actuator models, using a 3-pallet pool of queued work to stay in production during much of a +80-hour work week. Workpieces are DOM tubing and alloy steel, weighing 60 to 500 lb. The tubular parts have welded steel flanges on each end and some have off-center plates on the sides. These are mounted on an angle plate that has half-rounds to locate off the OD of the tube.
Helac actuators provide swing, steering, head rotation, articulation, and similar capabilities, with drift-free, brakeless positioning, and protection from overload conditions.

Most U.S. shops take for granted the quality and reliability of their electric power, though invariably there are power fluctuations and outages, and in some regions of the world these are inescapable. Operating CNC machine tools in such an area will underscore how well a machine control can handle a power ‘hiccup’: Can the CNC recover quickly or does it forget what planet it's on?

Jerry Gilara, director of Continuous Improvement, and his maintenance team at Helac Corporation in Enumclaw, WA, knew the answer for an older vertical turning center that is a vital operating unit for the plant, and a workhorse production unit. It is critical to Helac’s production program. Built in 1998, the MAG VTC experienced significant downtime with every power hiccup.

"This is a rock-solid, very capable machine, but it’s older CNC and DC drives/motors were an Achilles heel," Gilara explained. "We've always been pleased with the machine, so we had MAG retrofit a new Fanuc CNC and AC digital axis drives/motors and spindle. The retrofit transformed the machine, making it utterly reliable and giving us other advantages because of the widespread use of Fanuc controls in our shop."

Helac's main products are helical hydraulic rotary actuators, a clever device that translates linear piston movement into rotary motion. Extremely compact, the Helac actuator produces high torque with high load-bearing capacity, making it an ideal positioner or steering component for mobile construction equipment, forklifts, aerial platforms, utility vehicles, agricultural equipment, marine applications, etc. The actuators provide swing, steering, head rotation, articulation and similar capabilities, with drift-free, brakeless positioning, and protection from overload conditions. The device is covered by many patents and has been adapted and sized for numerous applications.

Gilara said a significant portion of Helac's parts pass across the MAG VTC, a 36-inch, fixed-height, 2-axis machine. The machine does heavy metal removal on the tube-shaped housings used for many actuator models, using a 3-pallet pool of queued work to stay in production during much of the plant's +80-hour workweek. Several hundred different part numbers are involved, made of DOM tubing and alloy steel, weighing 60 to 500 lb.

The tubular parts have welded steel flanges on each end, and some have off-center plates on the sides. "We mount these on an angle plate that has half-rounds to locate off the OD of the tube," Gilara continued. "We bore the part completely in one shot from the top, with tolerances of 0.001 in. Then, we face two parallel surfaces so everything is concentric. We do all the machining from one end, using a 250-lb boring bar with a CAT 60 taper, which is a primary reason we purchased this machine. We have a backup machine for this work, but that machine is what caused us to purchase the MAG unit. When our primary machine is down, we're quite unhappy, because parts aren't moving through production."

Because power quality is often in question due to wind conditions in this area of Washington, the machine's control frequently lost its memory during brief power outages. "Every time the power ‘hiccupped’ the control would lose memory, even with an outage of just a minute, and it could take a day or two to reload all the programs," Gilara explained. "If it happened on the second shift when no maintenance people were available, the machine might sit idle until morning before someone could work on it. The CNC hardware and DC drives had become liabilities, too."

Helac discussed a retrofit of the CNC and drives/motors with MAG in 2009, and the new hardware – a Fanuc 0iTD CNC, AC spindle, servo drives and motors – was installed in 2010. MAG offers pre-engineered, modular retrofit packages with pre-built panels, providing a modular approach that represents an economical retrofit of just the CNC, or the CNC with servos, spindle drive and motors – at different times, if needed, to distribute the cost as budgeting may require.

MAG is a machine tool builder and machining systems developer. It offers pre-engineered retrofit kits for many models of its legacy brand VTLs, HBMs, lathes, HMCs, VTCs and 5-axis machines, utilizing Fanuc, Fagor and Siemens control solutions.

"Our power-quality issues have become non-issues since the retrofit," according to Gilara. "We went through an entire winter without a problem. And, the similarity of the Fanuc control to others in our shop has given us advantages in programming and training. We can now post process to a Fanuc file, like the rest of the machines in our plant, and operators familiar with other machines in our plant can migrate to this machine with less training. The faster data handling of the new control also yields improvements in finish. Given this machine's workhorse capability, accuracy and repeatability, the retrofit has proved a cost-effective investment."

Most U.S. shops take for granted the quality and reliability of their electric power, though invariably there are power fluctuations and outages, and in some regions of the world these are inescapable. Operating CNC machine tools in such an area will underscore how well a machine control can handle a power ‘hiccup’: Can the CNC recover quickly or does it forget what planet it's on?

Jerry Gilara, director of Continuous Improvement, and his maintenance team at Helac Corporation in Enumclaw, WA, knew the answer for an older vertical turning center that is a vital operating unit for the plant, and a workhorse production unit. It is critical to Helac’s production program. Built in 1998, the MAG VTC experienced significant downtime with every power hiccup.

"This is a rock-solid, very capable machine, but it’s older CNC and DC drives/motors were an Achilles heel," Gilara explained. "We've always been pleased with the machine, so we had MAG retrofit a new Fanuc CNC and AC digital axis drives/motors and spindle. The retrofit transformed the machine, making it utterly reliable and giving us other advantages because of the widespread use of Fanuc controls in our shop."

Helac's main products are helical hydraulic rotary actuators, a clever device that translates linear piston movement into rotary motion. Extremely compact, the Helac actuator produces high torque with high load-bearing capacity, making it an ideal positioner or steering component for mobile construction equipment, forklifts, aerial platforms, utility vehicles, agricultural equipment, marine applications, etc. The actuators provide swing, steering, head rotation, articulation and similar capabilities, with drift-free, brakeless positioning, and protection from overload conditions. The device is covered by many patents and has been adapted and sized for numerous applications.

Gilara said a significant portion of Helac's parts pass across the MAG VTC, a 36-inch, fixed-height, 2-axis machine. The machine does heavy metal removal on the tube-shaped housings used for many actuator models, using a 3-pallet pool of queued work to stay in production during much of the plant's +80-hour workweek. Several hundred different part numbers are involved, made of DOM tubing and alloy steel, weighing 60 to 500 lb.

The tubular parts have welded steel flanges on each end, and some have off-center plates on the sides. "We mount these on an angle plate that has half-rounds to locate off the OD of the tube," Gilara continued. "We bore the part completely in one shot from the top, with tolerances of 0.001 in. Then, we face two parallel surfaces so everything is concentric. We do all the machining from one end, using a 250-lb boring bar with a CAT 60 taper, which is a primary reason we purchased this machine. We have a backup machine for this work, but that machine is what caused us to purchase the MAG unit. When our primary machine is down, we're quite unhappy, because parts aren't moving through production."

Because power quality is often in question due to wind conditions in this area of Washington, the machine's control frequently lost its memory during brief power outages. "Every time the power ‘hiccupped’ the control would lose memory, even with an outage of just a minute, and it could take a day or two to reload all the programs," Gilara explained. "If it happened on the second shift when no maintenance people were available, the machine might sit idle until morning before someone could work on it. The CNC hardware and DC drives had become liabilities, too."

Helac discussed a retrofit of the CNC and drives/motors with MAG in 2009, and the new hardware – a Fanuc 0iTD CNC, AC spindle, servo drives and motors – was installed in 2010. MAG offers pre-engineered, modular retrofit packages with pre-built panels, providing a modular approach that represents an economical retrofit of just the CNC, or the CNC with servos, spindle drive and motors – at different times, if needed, to distribute the cost as budgeting may require.

MAG is a machine tool builder and machining systems developer. It offers pre-engineered retrofit kits for many models of its legacy brand VTLs, HBMs, lathes, HMCs, VTCs and 5-axis machines, utilizing Fanuc, Fagor and Siemens control solutions.

"Our power-quality issues have become non-issues since the retrofit," according to Gilara. "We went through an entire winter without a problem. And, the similarity of the Fanuc control to others in our shop has given us advantages in programming and training. We can now post process to a Fanuc file, like the rest of the machines in our plant, and operators familiar with other machines in our plant can migrate to this machine with less training. The faster data handling of the new control also yields improvements in finish. Given this machine's workhorse capability, accuracy and repeatability, the retrofit has proved a cost-effective investment."

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