March 23, 2009

BRISTOL, Tenn. (March 23, 2009) – Marcos Ambrose turned in his best NASCAR Sprint Cup Series finish of the season crossing the finish line in 10th place in the Food City 500 at Bristol Motor Speedway. Ambrose was on his way to a top five finish after running as high as second place in the 500-lap event, but experienced problems under the hood of his No. 47 Little Debbie® Toyota after halfway that hindered his efforts. Ambrose and his team stayed focused and rallied together to earn a strong finish in race five of the 2008 NASCAR Sprint Cup Series season.

“We had such a great car and we had an awesome run,” Ambrose said. “It’s a shame we lost the number two and number four cylinder. So, we were running on six at the end, but somehow we brought it home. I’m really happy with our efforts. I mean to run up front like we did and come away with a top 10 finish is a good day for us. I really have to thank Tad and Jodi (Geschickter) for giving me this opportunity. If it wasn’t for them, I probably wouldn’t be standing here right now.”

The Hardinge Group signed on as a sponsor of JTG Daugherty Racing in the NASCAR Sprint Cup Series and the NASCAR Nationwide Series during the 2008 season. JTG Daugherty Racing, owned by Tad and Jodi Geschickter along with former NBA All-Star Brad Daugherty, is headquartered in Harrisburg, North Carolina.

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Hard Turning FAQ’s

March 18, 2009

What materials are appropriate for hard turning?
When are CBN cutting inserts the appropriate choice?

If the hardness ranges between 50-68 Rc and the depth of hardness is greater than the depth of material to be removed, then Cubic Boron Nitride (CBN) is the best medium. CBN will give good tool life and wear properties. Surface finishes of 11-15 micro-inches can be achieved and maintained. ISO inserts are available with multiple grades to suit different machining requirements. Insert hardness and, therefore, wear rate are traded for toughness and ability to withstand shock loading from interrupted cuts, i.e., keyways.

  • Hardest (Suitable for plain diameters only)
  • Medium (Suitable for moderate interruption)
  • Toughest (Suitable for machining gear o/d)

Typical cutting data for CBN:

  • 315 – 335 feet per minute (96-102 m/min)
  • .008″ – .010″ (0.2-0.25 mm) depth of cut
  • .004″ IPR (0.1 mm/rev) feedrate

The size of the insert nose radius determines the surface finish achieved within the limits of machine and component rigidity. CBN is undoubtedly the best option, provided the workpiece material is uniformly hard. It will work on steel with a hardness above 50Rc.

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