Shop Reins in Lead Times with Compact HMCs

Alicat Scientific, a manufacturer of instruments for flow and control in gas and liquid applications, was having a good year. But that brought a challenge. The surge in orders overwhelmed the shop’s vertical machining center capacity, driving lead times up by six times, prompting Alicat to seek additional equipment. A Kiwa horizontal machining center from Methods Machine Tools helped the shop’s production catch up with sales. 

Based in Tucson, Arizona, the ISO 9001-certified company has been designing and manufacturing precision instruments since 1991. Alicat, whose products can be found in contexts ranging from mining projects to NASA space programs and even artificial heart machines, claims the flexibility and durability of its instruments sets it apart. 

Surprised by a 300-mm HMC

Whatever the cause of Alicat’s success, it eventually pushed the shop past the limits of its capacity. With lead times reaching 28 days, shop manager Greg Camron began looking to add a new machine to the shop floor. 

Alicat was first introduced to Methods Machine Tools a year before when the shop purchased a used VMC from a customer, with installation assisted by Methods Phoenix. During his machine research, Mr. Camron met with Tony Harrod, a sales manager with Methods Phoenix, who recommended getting an HMC. Mr. Harrod knew that floor space in Alicat’s shop was limited, which is one of the reasons the shop had not considered HMCs before. For this reason, he talked to Mr. Camron about the Kiwa KMH300A, a 300-mm machine that fit the shop’s spacing needs.

At first, Mr. Camron was skeptical about the machine’s capability. He had been told by other salespeople in the past that a 300-mm machine would not have the capability to cut stainless. The small footprint made this particular model more attractive. “We decided to take shot with the KMH300A and trusted Tony when he said it would be able to handle the job,” he says. “The results blew us away.”

Within two weeks, Alicat’s first KMH300A was making chips. Within another six weeks, the shop was so impressed that it bought a second. Between these two machines, the shop was able to pull itself out of its production hole and bring lead times back down to a maximum of five days. 

“We are cutting 316 stainless at 140 ipm and 303 stainless at 200 ipm,” Mr. Camron says. “The machines are cutting so well that it sounds like I am cutting aluminum instead of stainless steel.”

Going Unattended

The two KMH300As sustained production until 2017, when Alicat went through another period of massive growth, which prompted the shop to add a third KMH300A, this one with a PC6 pallet pool. The added pallets enabled Mr. Camron to run the machines unattended overnight, trusting the machine’s reliability. A year later, Alicat purchased another KMH300A with a PC6. 

“Since switching over to the Kiwas, we have shortened our time per part by about 50% and are now running 24/7. We have three shifts and have no problem letting the Kiwas run unattended, knowing that they are going to keep going without any issues,” Mr. Camron says.

The Kiwa KMH-300 series of machines features an integrated full rotary B axis and FANUC Oi-MF control. A spindle oil cooling system and coolant-through ballscrews are standard. Including the chip conveyor, the KMH-300 takes up a footprint of 140 by 107 inches. According to Methods, this is the same amount of space taken up by a typical 30- by 20-inch VMC. Standard features include dual 320-mm pallets; roller guideways; a 15-hp, 15,000-rpm direct-drive Big Plus spindle; and large-width doors and panels to ease setup and maintenance. For chip evacuation, the machines combine features like an overhead shower system, chip conveyor/coolant tank and pumps, and dual internal chip augers.

Mr. Camron says three features have benefited Alicat the most:

1. The standard Big Plus spindle improved tool stability and thus improved finishes.
2. The roller-bearing ways provide stability and allow for high-feed machining to increase material removal rates.
3. The change to horizontal milling provided better chip evacuation and coolant flow to prevent recutting of chips.