Protecting Capital Equipment

Often the best way to know what your customer wants is to have been a customer yourself—to have experience in a certain line of work and have first-hand knowledge of what issues are faced and what products could make the job easier. Some of the best product ideas come from creative minded individuals on the front line who step back and think, “What if?”

Some prime examples of such innovation come from a dental implant manufacturer in Calabasas Hills, California. Implant Direct LLC, was formed in 2004 by Dr. Gerald Niznick, a prosthodontist with more than 35 years of practical experience and 25 U.S. patents in dental implant technology. Prior to founding this company, Dr. Niznick had owned and operated another implant design and engineering firm for 19 years. His knowledge of the needs of implant engineering and his desire to do what it takes to be on the leading edge of technology have allowed Implant Direct to become a top supplier for dentists worldwide. His reputation has earned him the nickname “the godfather of American implant dentistry" according to Barrons business magazine.

Going hand-in-hand with Dr. Niznick’s state-of-the-art approach to implant development is his philosophy for implementing advanced manufacturing technology. In preparing to build the company’s current facility, he carefully plotted out the entire shop floor. During construction, the floors were trenched to allow all electrical wiring to be located underground. Dr. Niznick continues to consult with the company’s engineers to determine what strategies will benefit the operation. According to Joe Morales, director of manufacturing at Implant Direct, “When he knows something will work, he’ll spend the money and time to make it happen.” One notable piece of technology effectively at work at Implant Direct is a monitoring device that is installed on every machine on the floor, including a line-up of 26 Star Swiss-type turning centers and a Walter CNC tool grinder.

“The Atam,” as Mr. Morales refers to the device, is designed to perform machine diagnostics and real-time, in-process tool action monitoring. The process analyzer from Atam Systems (New Albany, Ohio) is a relatively simple tool. One vibration sensor is attached to the machine’s turret and one is attached to the gang tool plate. All vibration in the turret is measured. Next to the machine is a PC that records a separate fingerprint, or signature, sent from the Atam for each process, such as ID threading, OD threading or ID center drilling. According to Mr. Morales, “It might take 20 processes to make a part. Each process will have its own unique signature that we want to match to be sure that the machine is running at its optimum and that it has good parts coming off of it.”

Limits are set to correspond with each signature and the Atam is programmed to know where the vibrations should be. If a limit is hit, the system shuts down the machine within as little as 3 milliseconds. “Shutting down the machine, alone, could save us thousands of dollars,” Mr. Morales explains. “In a shop like this, without the Atam, someone could break a turret full of tools daily. We have ten or 12 tools going in the machine, and if the first or second one breaks, the rest of them could follow and all could be gone. Assuming that’s all you lose, you still need someone to go over and reset all of the tools, and then the quality department would need to inspect the part. It might take you out of operation for 4 hours, or if it happens on second shift, you might be down until morning.”

In addition to replacing and resetting the tools, an important consideration is the time involved in determining the reason for the breakage. If the break is not caught immediately, by the time the part cycles through and all the other tools are gone, pinpointing the problem to prevent it from happening again becomes a major issue. The Atam stops the machine immediately after the break and archives the data. A 30-second window, graphed in 3-second increments, is captured to display the activity during the spike.

Implant Direct previously considered the Atam as a tool to be used only for longer runs, typically approaching 10,000 pieces. The setup time involved in defining signatures seemed to dictate the system’s usefulness for particular jobs. And of course, the likelihood of a problem decreased as the runs got shorter. Every morning, employees from various departments including programming, tooling, setup and sometimes quality, get together for an “Atam meeting” to discuss ways to increase productivity and performance of the machines. Over time, through teamwork and brainstorming, the group has found ways to make efficient use of the system on part runs as small as 500. “We may be running a job of only a few hundred pieces, but then it’s followed by ten more runs from the same family of parts,” Mr. Morales explains. “In that case, the signature doesn’t really change much. Only a couple of parameters, for length and time, need to be adjusted.”

Mr. Morales views teamwork and the cutting-edge philosophy that Dr. Niznick has fostered in the company as the key to its success. “When we began discussions about building this facility, we proposed to Dr. Niznick the use of the Atam systems. His willingness to listen and implement our recommendations, in this case and others, has been very rewarding for the
company."

Additional Prevention

As another example of advanced technologies that Implant Direct continues to implement in its shop, the company has installed on each of its turning centers automatic fire suppression systems from Firetrace International LLC (Scottsdale, Arizona). These systems include a fire extinguisher-type cylinder that attaches to the back of the machine. Tubing runs from this cylinder and extends inside the machine to locations in the work area representing the most likely sources of fire. This Firetrace Detection Tubing (FDT) is sensitive to the heat of a fire and will rupture at the point nearest the flame.

In a direct-release system, fire suppressant is then released directly from the tubing. For larger areas that would require a greater amount of fire suppressant, an indirect-release system uses the rupture of the tubing only as a detection device. In this design, the resulting drop in pressure caused by the tube rupture activates a valve that diverts flow from the detection tube to the larger outlet ports. Extinguishing agent is discharged from the cylinder through diffuser nozzles strategically placed within the protected enclosure.

When a fire is detected, the system can discharge a fire-suppressing agent in as little as 4 seconds. Most often, Firetrace systems are installed with HFC-227ea or CO2 agents, but because Implant Direct works with titanium, FM-200 is the agent of choice in this shop. Whenever possible, based on the materials being cut, clean agents such as these are used because they leave no residue on the machines.

According to Mr. Morales, “If the Firetrace system is activated, the fire is suppressed in seconds, and we can be back up and running as soon as the cause has been determined and fixed. There is virtually no cleanup.” He feels the systems provide such value that he installs them on each new machine as soon as it is placed on the floor.