Spindle Authenticators

The Shaft-Mounted Authenticator™ AUT-1000

Spindle Authenticator, evaluate spindle Authenticator

An Authenticator™ is a device used to evaluate the axis of rotation of a precision spindle. It is basically a coupling device. It holds an Ultra- Precise Test Sphere and temporarily, but rigidly attaches it to the spindle being evaluated. This basic version of the Authenticator™ (Part Number AUT- 3000) has an integral drive shaft for mounting it in the machine spindle. The standard configuration of this device is supplied with a one and one quarter +.0000 -.0005 inch (31.75 +.00000 -.01270 mm) diameter shaft. Custom-manufactured drive devices will be made to satisfy your specific needs. Drive shafts of any English or Metric diameter and other special configurations such as tapers, including internal threads for draw bar, may be quickly produced at reasonable cost. Facilities are included for precisely aligning the axis of the sphere with the axis of rotation of the bearing system. The exact position of the Ultra Precise Test Sphere is adjusted by a four screw wobble plate. The flexure of this wobble plate is affected through an integrally machined ligature that achieves a careful balance between flexibility and rigidity. The advantage of the four screw adjustable wobble plate over a three screw wobble plate is its simplicity. There are no vector displacements to try and interpret, simply loosen the screw corresponding to the most positive displacement of the sphere and tighten the opposing screw. When approaching the final setting, the tension on the screw corresponding to the low point of the sphere is simply increased and an entirely elastic bending achieves the final movement of the sphere.

The one inch (25.4 mm) diameter Ultra Precise Test Sphere is produced from very fine grained, high chrome, high carbon stainless steel. It is hardened to 58 Rockwell C for wear- resistance and ultra-cold cycled for long term dimensional stability. The Ultra Precise Test Sphere is just that, it is spherical within 2.5 micro inches (63.5 nm) maximum and has a surface finish that is better than 0.5 micro inches (12.7nm) Ra. This is ten times more accurate than high quality bearing balls. Spheres of this quality are simply not commercially available. Unlike tungsten carbide, this material has the good uniform electrical conductivity that is so important for spindle bearing evaluation with CAP gages. Each Authenticator™ has an individual identification number permanently marked on its body. An individual polar chart recording documenting the roundness of the Ultra Precise Test Sphere is supplied with each Authenticator™.

The Ultra-Precise Test Sphere is attached to the body of the Authenticator™ in a manner that provides an ultra-low electrical resistance between it and the body. This is extremely important when using capacitance gages for evaluating the spindle characteristics. The Ultra-Precise Sphere is not just glued to the body. A steel pin extends deep into a hole in the sphere and into the body to achieve an extremely strong connection. The entire body of this Authenticator™ is machined from a solid piece of 3 inch (76.2 mm) diameter high-tensile stainless steel which is heat treated to develop its maximum physical properties. In order to maintain the dynamic balance of the device, no clamping flats are machined on the drive shaft. Custom-machined flat or flats will be provided to meet customer specifications. All diameters are held concentric. All details are very symmetrical and dimensionally constant yielding an excellent dynamic balance. Each one of the four socket head cap screws used to adjust the wobble plate are carefully machined to give them exactly the same mass.

Basic Magnetically-Mounted Authenticator— AUT-2000

Magnetically mounted authenticator, AUT-2000 AUT-2000 Print
Bal-tec Magnetically Mounted Spindle Authenticator

An Authenticator™ is a device used to evaluate the axis of rotation of a precision spindle. It is basically a coupling device. It holds an Ultra Precise Test Sphere and temporarily, but rigidly attaches it to the spindle being evaluated. The very basic magnetic Authenticator™ (our Part Number AUT-2000) uses a powerful rare earth magnet with a holding power in excess of 60 pounds (27.2 kg) to attach the Ultra Precise Test Sphere to the spindle. The flat surface of this magnet is simply placed against a magnetically permeable flat face plate that is perpendicular to the spindle axis. It is placed with the sphere approximately centered with the spindle axis. A soft head hammer is used to tap the outside rim until the sphere is in the desired location in relation to the spindle axis. Because the holding power of the large rare earth magnet is so great, we provide a jack screw on each side of the device to break the magnetic pull, so that it can be easily removed from the spindle at the end of the test.

This same set of jack screws can be used to reduce the magnetic pull when first placing the magnet on the spindle. By advancing one or both of the jack screws a slight amount, the Ultra Precise Test Sphere can be easily tapped into approximate position. Then the full power of the magnet is applied by withdrawing the jack screws, thus allowing the magnet to come into full contact with the The one inch (25.4 mm) diameter Ultra Precise Test Sphere is produced from very fine grained high chrome high carbon stainless steel. It is hardened to 58 Rockwell C for wear-resistance and ultra-cold cycled for long term dimensional stability. The Ultra Precise Test Sphere is just that, it is spherical within 2.5 micro inches (63.5 nm) maximum and has a surface finish that is better than 0.5 micro inches (12.7 nm) Ra. This is ten times more accurate than high quality bearing balls. Spheres of this quality are simply not commercially available.

Unlike tungsten carbide, this material has good uniform electrical conductivity which is so important for spindle bearing evaluation when using non contact capacitance gage. The body of the Basic Magnetic Authenticator is machined from a single piece of 2-3 /4 inch (69.85 mm) diameter very highly permeable magnetic material. This body is electro less nickel plated for corrosion resistance. Each Authenticator has an individual identification number permanently marked on its body. An individual polar chart recording documenting the roundness of the Ultra Precise Test Sphere is supplied with each Authenticator™. The Ultra Precise Test Sphere is attached to the body of the Authenticator™ in a manner that provides an ultra low electrical resistance between it and the body. This is extremely important when using capacitance gages for the critical evaluation of the spindle characteristics. The Ultra Precise Sphere is not just glued to the body. A steel pin extends deep into a hole in the sphere and into the body to achieve an extremely strong connection. In order to preserve the dynamic balance of the device, all details are maintained very symmetrical, dimensionally balanced and constant.

The Magnetically-Mounted Authenticator™ with Four Place Wobble Plate, AUT-3000

Magnetically-Mounted Authenticator Magnetically Mounted Spindle Authenticator/Evaluator
Bal-tec Magnetically Mounted Authenticator

An Authenticator™ is a device used to evaluate the axis of rotation of a precision spindle. It is basically a coupling device. It holds an Ultra Precise Test Sphere and temporarily but rigidly attaches it to the spindle being evaluated. The magnetic Authenticator™ with four place wobble plate ( Part Number AUT-3000) uses a powerful rare earth magnet with a holding power in excess of 60 pounds (27.2 kg) to attach the Ultra Precise Test Sphere to the spindle. The flat surface of this magnet is simply placed against a face plate that is perpendicular to the spindle axis. It is placed with the sphere approximately centered with the spindle axis. This device is provided with a four place wobble plate that can adjust the position of the Ultra Precise Test Sphere.

Because the holding power of the large rare earth magnet is so great, we provide a jack screw on each side of the device to break the magnetic pull so that it can be easily removed from the spindle at the end of the test. This same set of jack screws can be used to reduce the magnetic pull when first placing the magnet on the spindle. By advancing one or both of the jack screws a slight amount, the Ultra Precise Test Sphere can be more easily tapped into approximate position with a soft face hammer. Then the full power of the magnet is applied by withdrawing the jack screws, thus allowing the magnet to come into full contact with the spindle face.

The one inch (25.4 mm) diameter Ultra Precise Test Sphere is produced from very fine grained high chrome high carbon stainless steel. It is hardened to 58 Rockwell C for wear-resistance and ultra-cold cycled for long term dimensional stability. The Ultra Precise Test Sphere is just that, it is spherical within 2.5 micro inches (63.5 nm) maximum and has a surface finish that is better than 0.5 micro inches (12.7 nm) Ra. This is ten times more accurate than high quality bearing balls. Spheres of this quality are simply not commercially available. Unlike tungsten carbide, this material has good uniform electrical conductivity which is so important for spindle bearing evaluation when using capacitance gages. The exact position of the Ultra Precise Test Sphere is adjusted by a four screw wobble plate. The flexure of this wobble plate is affected through an integrally machined ligature that achieves a careful balance between flexibility and rigidity. The advantage of the four screw adjustable wobble plate over a three screw wobble plate is its simplicity. There are no vector displacements to try and interpret, simply loosen the screw corresponding to the most positive tighten the opposing screw. When approaching the final setting, the tension on the screw corresponding to the low point of the sphere is simply increased and an entirely elastic bending achieves the final movement of the sphere. The body of the Magnetic Authenticator™ with the four place wobble plate is machined from a single piece of 2-3 /4 inch (69.85 mm) diameter very highly permeable magnetic material. This body is electro less nickel plated for corrosion resistance.

Each Authenticator has an individual identification number permanently marked on its body. An individual polar chart recording documenting the roundness of the Ultra Precise Test Sphere is supplied with each Authenticator™. The Ultra Precise Test Sphere is attached to the body of the Authenticator™ in a manner that provides an ultra low electrical resistance between it and the body. This is extremely important when using capacitance gages for the critical evaluation of the spindle characteristics. The Ultra Precise Test Sphere is not just glued to the body. A steel pin extends deep into a hole in the sphere and into the body to achieve an extremely strong connection. In order to preserve the dynamic balance of the device, all details are maintained very symmetrical and dimensionally balanced and constant. Each one of the four socket head cap screws used to adjust the wobble plate are carefully machined to have exactly the same mass.

The Flange Mounted Authenticator™ AUT-4000

Spindle Rotation Authenticator
Bal-tec Flange Mounted Authenticator
Authenticator Print
AUT4000, print
AUT4000
AUT4000
Downloads
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Download as PDF Download as Solidworks Download as IGES

An Authenticator™ is a device used to evaluate the axis of rotation of a precision spindle. It is basically a coupling device. It holds an Ultra- Precise Test Sphere, and temporarily, but rigidly attaches it to the spindle being evaluated. The basic Flange Mounted Authenticator™ (Part Number AUT- 4000) is the most universal of the spindle evaluating tools. This simple device will evaluate the accuracy of the axis of rotation of a spindle within micro-inches. The complete body of this Authenticator™ is machined from a solid 4 inch (101.6 mm) diameter piece of high-tensile stainless steel which is heat treated to develop its maximum physical properties. The one inch (25.4 mm) diameter Ultra Precise Test Sphere is produced from very fine grained high chrome high carbon stainless steel. It is hardened to 58 Rockwell C for wear- resistance and ultra-cold cycled for long term dimensional stability. The Ultra Precise Test Sphere is just that, it is spherical within 2.5 micro inches (63.5 n m) maximum and has a surface finish that is better than 0.5 micro inches (12.7 n m) Ra. This is ten times more accurate than high quality bearing balls. Spheres of this quality are simply not commercially available.

Unlike tungsten carbide, this material has good uniform electrical conductivity which is so important for spindle bearing evaluation with capacitance gages. The exact position of the Ultra Precise Test Sphere is adjusted by a four screw wobble plate. The flexure of this wobble plate is affected through an integrally-machined ligature that achieves a careful balance between flexibility and rigidity. The advantage of the four screw adjustable wobble plate over a three screw wobble plate is simplicity. There are no vector displacements to try and interpret, simply loosen the screw corresponding to the most positive displacement of the sphere and tighten the opposing screw. When approaching the final setting, the tension on the screw corresponding to the low point of the sphere is simply increased and an entirely elastic bending achieves the final movement of the sphere. There are eight precisely-drilled holes oriented around the outer edge of the flange of this device that allow it to be securely clamped to the face of a spindle using four or more socket head cap screws.

The same eight holes allow this device to be rigidly attached to an extension shaft or magnetic adaptor. In this way, one device can be used in a multitude of applications. There is a concentric counter-bore in the back of the flanged Authenticator™. This counterbore locates the shaft adaptors concentric to the axis of the ultra-precise sphere. Each Authenticator™ has an individual identification number permanently marked on its body. An individual polar chart recording documenting the roundness of the Ultra Precise Test Sphere is supplied with each Authenticator™. The Ultra Precise Test Sphere is attached to the body of the Authenticator™ in a manner that provides an ultra low electrical resistance between it and the body. This is extremely important when using capacitance gages for the critical evaluation of the spindle characteristics. The Ultra Precise Test Sphere is not just glued to the body. A steel pin extends deep into a hole in the sphere and into the body to achieve an extremely strong connection. In order to preserve the dynamic balance of the device, all details are maintained very symmetrical and dimensionally balanced and constant. Each one of the four socket head cap screws used to adjust the wobble plate are carefully machined to give them exactly the same mass.

Titanium Flange Mounted Authenticator—AU-4000-T

Titanium Authenticator

In some applications the weight of our standard stainless steel Authenticator, AU4000, is undesirable; so we have basically built this long time standard device in titanium. All of the dimensions and features of the titanium device are exactly the same as the stainless steel, except that the titanium version weighs less. Any of our other standard designs can be supplied in titanium on special order.

Mini Authenticator

Bal-tec Mini Authenticator
Bal-tec Mini Authenticator

The mini authenticator has all of the characteristics of the standard flange mounted unit, except for its small size and very light weight (see previous pages). It is one and one half inches (38.1 mm) in diameter, and one and one eighth inches (28.5 mm) overall height. It weighs only three and one half ounces ( 102 grams ). The ultra precise ball used to evaluate the spindle's axis of rotation, is one-half-inch (12.7 mm) diameter, ultra fine grain, high chrome, high carbon, hardened stainless steel. This material has a high electrical conductivity that gives excellent results when used with capacitance gages.

Roundness Master

Roundness Master evaluation standard

Roundness Master Calibration Spheres for calibration of roundness measuring machines are available with high quality long wearing tungsten carbide spheres. The .500 inch (12.7mm) sphere is round to less than 2.5 micro inches (50.8 nm). This flange mounted master sphere can be used on all roundness measuring machines.

See: Technical Data Sheet AUT-6.

Authenticator Pricing

Part # Description Price Purchase
AUT-1000 SPINDLE AUTHENTICATOR $556.25 Shopping Cart
AUT-2000 SPINDLE AUTHENTICATOR, BASIC MAGNETIC $642.85 Shopping Cart
AUT-3000 SPINDLE AUTHENTICATOR, WOBBLE MAGNETIC $697.10 Shopping Cart
AUT-4000 SPINDLE AUTHENTICATOR, FLANGE MOUNTED $578.23 Shopping Cart
AUT-4000-T SPINDLE AUTHENTICATOR, TITANIUM FLANGE MOUNTED $820.00 Shopping Cart
AUT-MI SPINDLE AUTHENTICATOR, MINI AUTHENTICATOR $525.00 Shopping Cart
AUT-MS.5 ROUNDNESS MASTER CALIBRATION SPHERE $720.00 Shopping Cart
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