Improving Proven Technology
For decades, ARL Service has been building custom machinery for almost every industry. They're well known for their ability to equip machines with controls that are flexible and easy to use. When ARL acquired the Wit-O-Matic Company, another machine maker, they inherited a machine used for grinding carbide inserts.
Carbide inserts are cutting tools used to mill parts for anything from automobiles to aviation to appliances. The Wit-O-Matic is highly respected around the world. But ARL Owner Al Lewellen knew it could be improved.
Like many older grinding machines, it used a series of metal cams to control the way the machine cuts and sharpens the carbide inserts. These cams had to be designed, cut, and shaped by an outside specialist who would often take up to two weeks to produce them at a significant cost.
A Crazy Idea
Al Lewellen asked a question. "Can we get rid of the physical cams and replace them with digital cams?"
He was answered by one of his programmers who said, "That's crazy." To which Al said, "Great. Let's do it."
First, they scrapped the existing controls and removed all the fluid pressure lines to leave just the basic cutting machine. Already the footprint was reduced by half. Then they started to explore their options. To do so they called on Mitsubishi Electric Automation and their local distributor, Shaltz Automation; a team that had provided ARL with controls for many previous projects.
Together they worked up several approaches designed to add digital controls, software, and automation components. This combination would replace the physical cams.
According to Koreen Stratton of Shaltz Automation, "Al was trying to do something crazy; the kind of thing usually done by CNC. So doing it with servos and a simple motion module was going to be a real accomplishment."
One of the things Al insisted on was that the entire system should be extremely flexible and that all aspects of programming must include variables.
Making It Happen
This crazy idea turned out to be more complex than anyone could have imagined and required a tremendous amount of input from the members of the team. According to Al, "When it got down to the real ‘nitty-gritty,' the support from Mitsubishi Electric was fantastic."
The crazy idea paid off. Mechanical cams were replaced with virtual cams, which could be designed and programmed right there on the Wit-O-Matic's new control system, using its digital cam generator.
According to Al Lewellen, "We can quickly generate a new virtual cam using the HMI and the system's software. We can do just about any shape. And what's most important, everything is programmable and variable."
If the customer wants to learn to create new cams themselves, it's easy using the HMI's touchscreen.
Goodbye Cams -- Hello Productivity
Once the virtual cam has been programmed, it can be saved as a recipe and called up whenever the operator wants to run a specific carbide insert. And of course, the number of recipes that can be stored is basically without limit. This easy recall means operators can set up for a new part in as little as two minutes, as opposed to two hours or more using metal cams.
As a result, the operator can do smaller batch runs and change them out quickly. In the past, they'd feel obligated to run several thousand parts before a changeover, because setup was so laborious. Now, small runs of 15 or 20 parts are no problem.
The Improvement Never Stops
And with each new Wit-O-Matic sold by ARL Operations, the customer asked for something special, which always led to an improvement. "We were amazed," Al said. "That with each machine, we kept finding out just how much more these digital controls could do. So each new machine is better than the one before."
The customers who received those first machines were delighted, not only with the system, but also with the support. Because the control system is digital, a great deal of service can be delivered over the internet. This can include remote diagnosis, repairs, and upgrades.
New Levels of Service
In addition to all this support, ARL provides a remote service in which they will help the customer create and program a new digital cam, which can then be downloaded right into the customer's machine. If the customer wants to learn to create new cams themselves, it's easy using the HMI's touchscreen.
Become Our Next Success Story
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