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November 2011

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Nagel Precision Offers Alternatives to Bore and Face Grinding

Nagel Precision has introduced a new honing and cup wheel face super finishing system developed for small and medium volume production. It is designed to be a lower cost and higher quality alternative to ID and face grinding, the company said.

"This compact system combines two proven technologies, ECO 40 honing and SPV 150 cup wheel face finishing machines, into a single compact system," said a company spokesperson. "It generates sub micron bore to face perpendicularity and mirror finishes on bores as well as faces for a fraction of the cost of ID/face grinders.

"This hone and cup wheel finisher was developed to address the following shortcomings of the grinding process: When the faces are double-disk ground, there is no control over the bore-to-face perpendicularity. With ID grinding, when performed on a twin spindle machine, this problem will be overcome as the part is held in the same position as the face and bore is ground. However, for parts with smaller diameters and relatively deep bores-with length to diameter ratio of 2:1-honing has a real advantage in speed of material removal, and over 5:1 deflection of grinding spindle will cause the bore to taper. If a finer bearing like plateau honed finish is desired, neither ID grinding nor double-disk face grinding can achieve it, and a secondary finishing operation typically has to be instituted. Finally, it is easier to rework and remove 1 or 2 microns of stock with honing and face finishing, in case it is needed to bring a part into specification. It is very difficult to accomplish this with conventional grinding operation."

The ECO 40 honing head can hone bores up to 50 mm in diameter. In-process air sizing can be embedded in the tool for bores over 25 mm in diameter. The in-process air gage automatically measures the bore form error and makes automatic adjustments to correct the form error. Larger bores can be equipped with a dual expansion system, this system permits mounting, roughing and finishing abrasives with the same honing tool along with the in-process air gage. This permits roughing, finishing and gauging all in one tool, eliminating multiple stations. The SPV 150 cup wheel face finishes the clamping of the part on the bore and generates sub micron bore to face perpendicularity and flatness.

Typical applications include pinion gears, fuel injection components and any other components that require fine surface finish as well as excellent bore to face perpendicularity, the company said.

For more information contact:

Sanjai Keshavan

Manager - ECO Hone Division

Nagel Precision, Inc.

288 Dino Drive

Ann Arbor, MI 48103


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