Save time by setting tools offline with a presetter

Most machine tool accessory suppliers will tell you that the majority of shops still set tool-length offsets the old-fashioned way: By touching off each tool one at a time and manually keying in values—hopefully without fat-fingering one along the way.

Even on CNC lathes, most of which have a probe arm that allows the operator to simply touch off tools in the X and Z axes, tool setting might consume 3 to 5 minutes per tool—time that’s better spent making parts. So why continue to do it when an offline presetter saves time?

“For whatever reason, shops in the U.S. have not embraced presetting to the extent of those in Europe,” said Drew Strauchen, vice president of marketing and business development at Haimer USA LLC, Villa Park, Ill. “Part of the problem is resistance to change, and part is because the benefits of presetting are somewhat intangible. It takes a little digging to actually understand how much time is spent manually setting tools and what impact that has on shop throughput and profitability.”

Read/write RFID tags automate the tool-offset entry process. Image courtesy of Haimer USA

The math is fairly straightforward, he said. Assuming 1 hour per shift is spent on tool setting, five machines operating two shifts at an hourly shop rate of $75 costs the shop approximately $189,000 annually (10 hours a day × $75 per hour × 252 days a year). Even if a shop spends only a fraction of that time touching off, the savings are more than enough to justify the $8,000 or so for an entry-level presetter.

“Be it entry-level presetters for basic presetting or fully automated presetters that do everything at the push of a button, Haimer has options across its product portfolio to meet specific needs,” Strauchen said. “We can’t make setup time zero, but we can do a lot more of the preparatory work offline while the machine is busy making parts. And, in many cases, the presetting process itself is becoming more automated, with more options for sending data directly to the machine tool or writing to an embedded RFID (radio-frequency identification) tag. It offers a lot of advantages.”

That’s an understatement. Automatically sending a presetter-generated offset list to the machine control is faster than manual data entry and lessens the chance of a mistyped offset value. RFID takes it even further by integrating tool life and identification data with the tool, eliminating the possibility of inadvertently placing it in the wrong position. Not only is time saved during setup, but risk of a crash is reduced. And the accuracy of even a low-end presetter far exceeds what’s possible with traditional touch-off methods, improving part accuracy and preventing scrap.

Double Play

Not ready for networked machine tools or RFID-tagged toolholders? There are simpler options.

Ian Haase, North American product manager for EZset LLC, Ann Arbor, Mich., said presetters enable shops to just check tool runout, do quick measurements of lengths and diameters and then print tool-offset information on a label or bar code.

“We offer presetters with tool management capability, pneumatic spindle functions, vacuum or power clamping, autofocus, machine tool integration and so on, but for shops that only need basic functionality for use on the production floor, those machines are available as well,” Haase said. “The important thing is to start presetting. You’re losing money otherwise.”

Michael Colyer, regional sales manager at Zoller Inc., Ann Arbor, Mich., agreed, even if a shop isn’t sure about its future needs. “The first thing you need to consider is that bringing the tool-setting function outside of the machine tool is fundamental to lean manufacturing,” he said. “So even if you start with a basic presetter to get your feet wet, there are always secondary uses for those machines if you want to upgrade to a more capable system later on.”

Most presetters use high-resolution vision systems to find tool edges. Image courtesy of Koma Precision.

Chief among those uses is visual inspection of cutting tools, something that many shops don’t give much thought to. “They order a ½” drill from a large tooling supplier and assume that it was manufactured correctly,” Colyer said. “Maybe it was, maybe it wasn’t, but you can’t eliminate that variable without inspecting it first. This is one function that any presetter is perfect for, even if it doesn’t have some of the higher-end capabilities.”

Embracing the Gorilla

Like a number of presetter manufacturers, Zoller offers CNC versions of its wares that are able to automatically pick up tool edges, determine corner radii and seamlessly send offsets to machines on the production floor. Many of these systems are also equipped with, or integrate with, tool management software (TMS), providing a single source of the truth for tool data. That eliminates the risk of duplicate or conflicting information from the CAD/CAM software and ERP system, and spreadsheets scattered about the business. “Tool management is like a big, ugly gorilla,” Colyer said. “It sits in the corner, and everyone tries to avoid making eye contact because they know it’s going to be difficult and time-consuming to deal with. But with Industry 4.0 and the push towards digital manufacturing, it will become an increasingly integral part of shop operations everywhere.”

Though they offer limited functionality, entry-level machines are a great way to get started with presetting. Image courtesy of EZset.

TMS provides a single database that stores every aspect of tool information, from cutting tool and tool assembly dimensions for use by the programming department to inventory levels and procurement sources for purchasing. Cost data, historical usage and location in the toolcrib or vending machine can be found in one place. Granted, a presetter isn’t a prerequisite, but it is a logical starting point.