Broaching expertise key to shop’s success

When it comes to broaching, Ty Miles Inc. does it all: Build and rebuild broaching machines, produce broach tools and provide production broaching services.

With its humble beginnings, the family-owned Westchester, Illinois, company didn’t always provide such an array of capabilities. President Steven M. Mueller said his grandfather Tyrus H. Miles founded the company in 1958, designing broaching machines at his home and having them built elsewhere before he eventually leased manufacturing space and hired workers to produce the machines. One of the initial investors in the company was Leonard J. Smith, whose family owned a screw machine shop. Previously a Ty Miles customer, Smith ended up joining the company and served as president from 1972 to 1998, when he handed the reigns to Mueller.

Mueller said he started working at the company during his winter and summer breaks while attending the University of Illinois at Urbana-Champaign and came on board full time in 1978 after graduation.

Initially, Ty Miles outsourced broach manufacturing, Mueller said. “But as time went on, it was a natural for us to get into producing tools.” The tools are made of M4, T15 and powder metal HSS and are sold uncoated unless a customer specifies a coating, in which case Ty Miles sends the customer to a coating service.

Turn to Production

Ty Miles added production broaching services to its offerings in the 1990s when a customer with several of the company’s machines wanted to outsource a broaching program, Mueller explained. The customer approached the company that was producing its blanks, but the blank producer didn’t want to get involved with broaching and suggested that it purchase a broaching machine from Ty Miles and create a work cell. However, Ty Miles’ customer didn’t want to purchase additional equipment.

“So I raised our hand and said, ‘We can run broached parts for you,'” Mueller said. “That’s how we got into broaching parts.”

Because it was a high-volume automotive application that required broaching about 2 million parts annually, Ty Miles needed to extend its regular operating hours from 5 a.m. to 5 p.m. to 1 a.m. to 10 p.m., Mueller added. The company ran that program for about five years using two machines.

“On one machine, we were broaching four parts at a time, doing internal splines and other forms on an aluminum yoke part from the steering column,” he said. “We also broached an external slot on the clamp yoke.”

With that production broaching experience under its belt, the company took on additional automotive parts a few years later and continues to broach parts with the machines it builds — “the most efficient broaching machinery,” according to the company.

“When you are small,” Mueller said, “you can be flexible, and you just do what you have to do.”

Production of a broaching tool is viewed at Ty Miles. Image courtesy of Alan Richter

Similar to other part manufacturers, Mueller said he is not seeing as many high-volume applications as in the past, yet Ty Miles has a number of steady jobs. “But the volumes are not where we need to extend our hours to meet those deliveries. If somebody had those types of volumes today, they would look to do it in-house with our equipment.”

He said Ty Miles performs the vast majority of its production work using vertical broaching machines, with rotary broaching reserved for generating the twist on pistol barrels, for example. In addition to automotive, the company frequently serves the firearms, medical and hardware industries. Workpiece materials include stainless steel, steel, brass and aluminum, and typical broached features are keyways, splines, flats and forms. Common part tolerances are ±0.0254 mm (±0.001″), with some as tight as ±0.0127 mm (±0.0005″).

Adding Automation

Ty Miles reports that having robotics interfaced with one of its broaching machines makes things more economical by reducing operating costs while increasing production rates. Robotic part loading and unloading can be integrated with any Ty Miles broaching machine, and Mueller said the company has incorporated a small selective compliance articulated robot arm into numerous broaching systems. This arrangement is becoming more popular as smaller robots are being manufactured that cost less than earlier models, he added.

“The robot doesn’t take a break,” Mueller said. “In the right application, you are going to see more
robotics utilized.”

Nonetheless, although a broaching machine can run for an extended period of time without operator intervention, Mueller said he doesn’t feel that a broaching machine can run unattended during a night shift.

To enhance the versatility of a broaching machine by enabling it to perform secondary operations, Mueller said Ty Miles can add a rotary table to it. Indexing a part, for example, would enable a manufacturer to not only broach a feature but drill or tap a hole.