New Thruvar Quick Set-Up Gage Head for I.D. Grinders

"Marposs Corp now offers its innovative Thruvar through-the-spindle gauge for in-process measurement applications on internal grinding machines," said a company spokesperson. "The new Thruvar gauge incorporates push-button automatic setup adjustment that significantly reduces downtime and eliminates special tools that are necessary with other through-spindle gauge heads. Using the automatic setup feature, it is possible to reset the Thruvar gauge without operator intervention for a size variation of up to 25mm (1"). Similar gauges that use a special tool for manual adjustment of the gauge may require about five minutes to changeover.

"The new Thruvar gage, which is mounted inside the grinder's workhead spindle, measures workpiece inner diameter as the part is ground. Signals from the Thruvar gauge are sent to a monitor such as the Marposs P7 unit, which provides outputs to the grinder control based on real-time measurement of the workpiece size. The outputs are used to control the wheel slide infeed for precise size and finish consistency.

"Access to the fingers and contacts on the Thruvar gauge is obtained without removing the gauge from the spindle. Finger retraction is pneumatically controlled and the retraction distance is selectable in three increments 92mm (0.079'), 6mm (0.0236") and 10mm (0.394").

"The new Thruvar gauge is available in two sizes: Model 50 with a 50mm (1.96") body diameter for measuring inner diameters from 50 mm (1.97") up to 170mm (6.69"), and Model 70 with a 70mm (2.75") body diameter for measuring ID's from 75mm (2.95") up to 220mm (8.66").

"Adding to the economy and versatility of the new Thruvar gauge is the fact that one set of fingers and contacts covers a 25mm (1") diameter size range with no downtime for changeover. Other through-spindle gauges require multiple fingers/contact sets to cover an equivalent size range and require at least five minutes for each changeover.

"The design and materials used in constructing the Thruvar gauge provide high mechanical strength, thermal stability and resistance to wear and contamination."

For more information contact:

Marposs Corp.

3300 Cross Creek Parkway

Auburn Hills, MI 48326

888-627-7677

www.us.marposs.com

E-mail: marposs@us.marposs.com