LBB Series Ultra-Precision Gage Heads

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Roger Harrell
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LBB Series Ultra-Precision Gage Heads Linear Ball Bearing Design; Spring-Extend and Air-Extend The Linear Ball Bearing (LBB) series of dimensional gaging probes is engineered for highly precise and

Bearing assemblies utilize two circumferential rows of miniature balls held in position by a retainer.

1 LBB Series Ultra-Precision Gage Heads Linear Ball Bearing Design; Spring-Extend and Air-Extend The Linear Ball Bearing (LBB) series of dimensional gaging probes is engineered for highly precise and repeatable measurements in quality control and metrology applications. Linear ball bearings within the gaging probe minimize radial play and friction for ultra-precise measurement. Bearing assemblies utilize two circumferential rows of miniature balls held in position by a retainer. The balls ride on a non-rotating plunger hardened to Rockwell 65, hardchrome plated and precision ground for optimal repeatability and resistance to brinnelling. The contact end of the plunger has a removable tungsten carbide ball tip, with an AGD standard 4-48 UNF-2A threading. (See page 100 for replacement and alternate tips.) Plunger and bearings are enclosed in a cylindrical housing, hand-honed and fit to the ball bearing assembly. Precision fitting provides for exceptional gage head repeatability. With the bearings and housing essentially matched in hardness, the plungers can better tolerate side loads for a longer unit life. LVDT Configuration A Linear Variable Differential Transformer (LVDT) is contained in the opposite end of the tubular housing. With no physical contact between its core and coils, the LVDT produces a highly repeatable, low noise output voltage linearly proportional to probe displacement. Output can be sensed, amplified and displayed with any Schaevitz LVDT compatible signal conditioner, digital readout or LVDT computer based system (see the LVDT Instrumentation section of this catalog, page 111). 78 LBB gage heads feature a unique two-piece construction. Units, therefore, are reparable should either probe structure or cables become damaged. A bend relief spring prevents cable damage at lead exit. Positive mechanical stops prevent damage to the LVDT from severe impacts to the end of the contact tip in cases of overstroke. Linear ball bearing assemblies Removable tungsten carbide contact tip for long-term reliability and interchangeability Double-shielded LVDT for greater protection from effects of magnetic materials Polyurethane-jacketed cable enhances flexibility and improves chemical resistance Standard Viton boot for greater resistance to chemicals and high temperatures Radial cable exit adaptor supplied

Ranges: ±0.020" to ±0.2" Gaging Methods Spring-Extend Gage Heads Standard spring-extend LBB gage heads possess useradjustable pretravel/overtravel settings. Units are available in both 3.

Air-Extend, Spring-Retract Gage Heads Air-extend, spring-retract units are manufactured in a ±0.100" (±2.5 mm) gaging range. These units require dry, oil-free air at 5 to 15 psi (0.34 to 1 bar).

2 Ranges: ±0.020" to ±0.2" Gaging Methods Spring-Extend Gage Heads Standard spring-extend LBB gage heads possess useradjustable pretravel/overtravel settings. Units are available in both 3.15" (8 mm) and 0.375" (9.5 mm) diameters, with the latter available in both threaded and non-threaded housings. A 0.375" (9.5 mm) diameter, plain or threaded sleeve, can be provided for OEMs who want to stock one model with two diameters. Air-Extend, Spring-Retract Gage Heads Air-extend, spring-retract units are manufactured in a ±0.100" (±2.5 mm) gaging range. These units require dry, oil-free air at 5 to 15 psi (0.34 to 1 bar). By varying air pressure, users can control gaging force to ensure the probe does not damage finely finished surfaces or distort delicate parts. Air extend models are available in 0.375" diameters with either threaded or non-threaded housings. Applications Point-of-manufacture status of production process standards On-line inspection of automobile bodies Process feedback for numerically-controlled machine tools Automated data collection for factory SPC Robotics Gaging Ranges ±0.020"... Spring-extend ±0.040"... Spring-extend ±0.100"... Air- or spring-extend ±0.200"... Spring-extend Common Specifications Input Frequency to 10 khz Linearity... ±0.20% of full range output Repeatability " (0.10 µm) Operating Temp. Range F to 160 F (-40 C to 70 C) Temperature Coefficient of Sensitivity... ±0.005% of full range output/ F (±0.01% of full range output/ C) Housing Material... High carbon, chromium heat treated tool steel Cable feet (2 meters), 32 AWG stranded, PTFE insulated, shielded polyurethane jacket, 6 conductor Cable Exit... Axial standard; adaptor provided with most units allows for radial exit Spring-Extend Gage Heads Air-Extend, Spring-Retract Gage Heads 79

3 ± 0.020" Range; Spring-Extend Design User-adjustable pretravel and overtravel settings 0.315" (8 mm) or 0.375" (9.5 mm) body diameter Plain or threaded housing Calibration certificate supplied with every gage head Compatible with all Schaevitz signal conditioners 7 connector options (see page 100) Excitation V rms at 5.0 khz (nom) Sensitivity mv/v/.001" Null Voltage mv (max) Phase Shift ±3 Primary Impedance ohms Secondary Impedance ohms Pretravel " to 0.005" Overtravel " (min) Probe Force oz (70g) nominal at null Body Diameter " or 0.375" Body Type... Plain or threaded Cable Length ' (2.0m) Tip Thread mm desired connector number (see page 100). For example: LBB375PA INPUT BRN 1.690" ( ) fully extended 1.366" ( " at null (58.42) ) OUTPUT BLK Note: and tied for differential output with and BLK common. The output is in phase, with core displaced toward cable end. (Retract) LBB315PA " Unthreaded LBB375PA " Unthreaded LBB375TA " Threaded Ø 0.21" (5.34) Ø 0.375" or 0.315" (9.5 or 8.0) 3/8" - 40, UNS-2A x 0.689" (17.5) long, full thread in LBB375TA models only 80

4 ± 0.040" Range; Spring-Extend Design User-adjustable pretravel and overtravel settings 0.315" (8.0 mm) or 0.375" (9.5 mm) body diameter Plain or threaded housing Calibration certificate supplied with every gage head Compatible with all Schaevitz signal conditioners 7 connector options (see page 100) Special contact tips (see page 100) Excitation V rms at 5.0 khz (nom) Sensitivity mv/v/.001" Null Voltage mv (max) Phase Shift ±3 Primary Impedance ohms Secondary Impedance ohms Pretravel " to 0.005" Overtravel " (min) Probe Force oz (70g) nominal at null Body Diameter " or 0.375" Body Type... Plain or threaded Cable Length ' (2.0m) Tip Thread AGD INPUT BRN 2.90" at null (73.66) 2.172" ( ) fully extended 1.636" ( ) OUTPUT BLK Note: and tied for differential output with and BLK common. The output is in phase, with core displaced toward cable end. (Retract) desired connector number (see page 100). For example: LBB315PA Special contact tips are also available and can be ordered separately (see page 100). Ø 0.21" (Ø 5.34) Ø 0.375" or 0.315" (9.5 or 8.0) 3/8" - 40, UNS-2A x 0.689" (17.5) long, full thread in LBB375TA models only LBB315PA " Unthreaded LBB375PA " Unthreaded LBB375TA " Threaded 81

5 ± 0.100" Range; Spring-Extend Design User-adjustable pretravel and overtravel settings 0.315" (8 mm) or 0.375" (9.5 mm) body diameter Plain or threaded housing Calibration certificate supplied with every gage head Compatible with all Schaevitz signal conditioners 7 connector options (see page 100) Special contact tips (see page 100) Excitation V rms at 5.0 khz (nom) Sensitivity mv/v/.001" Null Voltage mv (max) Phase Shift ±3 Primary Impedance ohms Secondary Impedance ohms Pretravel " to 0.005" Overtravel " (min) Probe Force oz (70g) nominal at null Body Diameter " or 0.375" Body Type... Plain or threaded Cable Length ' (2.0m) Tip Thread AGD 0.16" (4.0) INPUT BRN OUTPUT BLK Note: and tied for differential output with and BLK common. The output is in phase, with core displaced toward cable end. (Retract) 3.20" at null (81.28) 2.62" ( ) fully extended 1.959" ( ) desired connector number (see page 100). For example: LBB375PA Special contact tips are also available and can be ordered separately (see page 100). Ø 0.21" (5.34) Ø 0.375" or 0.315" (9.5 or 8.0) 3/8" - 40, UNS-2A x 0.689" (17.5) long, full thread in LBB375TA models only LBB315PA " Unthreaded LBB375PA " Unthreaded LBB375TA " Threaded 82

6 ± 0.100" Range; Air-Extend Design 0.375" (9.5 mm) plain or threaded housing Variable probe force Calibration certificate supplied with every gage head Compatible with all Schaevitz signal conditioners 7 connector options (see page 100) Special contact tips (see page 100) INPUT OUTPUT Excitation V rms at 2.5 khz (nom) Sensitivity mv/v/.001" Null Voltage....0 mv (max) Phase Shift... ±20 Primary Impedance ohms Secondary Impedance ohms BRN BLK Note: and tied for differential output with and BLK common. The output is in phase, with core displaced toward cable end. (Retract) Pretravel " Overtravel " (min) Probe Force... Variable Body Diameter " Body Type... Plain or threaded Cable Length ' (2.0m) Tip Thread AGD Ø 0.375" (9.5) 4.25" (108.0) fully extended 3.91" (99.31) retracted 3.56" (90.4) 0.33" (8.47) Air input fitting 0.085" (2.16) desired connector number (see page 100). For example: LBB375PA-100A-1. Special contact tips are also available and can be ordered separately (see page 100). Ø 0.156" (3.96) Carbide ball (LBB375TA Models only) 3/8 40 UNS 3A Thread, 0.625" (15.9) Long LBB375PA-100A 0.375" Unthreaded LBB375TA-100A 0.375" Threaded 83

7 ± 0.200" Range; Spring-Extend Design 0.315" (8 mm) body diameter Plain housing Calibration certificate supplied with every gage head Compatible with all Schaevitz signal conditioners 7 connector options (see page 100) desired connector number (from page 100). For example: LBB315PA LBB315PA " Unthreaded Excitation... 5 V rms at 5.0 khz (nom) Sensitivity mv/v/.001" Null Voltage mv (max) WHITE Pretravel " Overtravel " (min) Probe Force oz (125g) nominal at null Body Diameter " Body Type... Plain Cable Length ' (2.0m) Tip Thread mm 1.04" (26.5) 5.79" (147.0) 3.87" (98.25) Carbide ball tip Ø 0.120" (3.0) ball (2.5 thd) Ø 0.315" (8.0) 6.5' (2.0M) 84

8 Options and Accessories See individual gage head model specification pages for compatibility Connectors Seven different connectors are available to simplify installation of LBB and PCA Series gaging probes, including the PCA Series Bidirectional Lever Probe. To select the proper connector, simply add the appropriate number to the end of the gage head part number. For example, by adding a 2 to a model number such as LBB375PA allows the user to specify a standard sensitivity gage head with an Amphenol-type connector. Connector Part Number Suffix Description 1 Bendix-type PTO6A-10-6P (SR) 2 Amphenol-type Amphenol-type DE-9 compatible with Schaevitz ATA Switchcraft-type 12CL5-M compatible with Schaevitz SYS-96 Dimensional Data Acquisition System 6 LEMO-type CONN. FGG-OB-305- CNAD52 7 Switchcraft-type 05BL5-M compatible with Schaevitz MP series LVDT readout/ controller Special Contact Tips Nine different Schaevitz contact tips are available for special applications and as replacements for standard tips supplied with most gage heads. All Schaevitz contact points are 4-48 AGD threaded. To order, select the proper contact tip number (9.53) 0.50 (12.7) (5.1) #2 #3 #4 # (9.53) # (3.18) (9.53) 0.50 (12.7) 0.50 (12.7) 0.25 (6.4) (1.6) (2.36) MS-Type Connector Cables (9.53) #7 #8 #9 # (15.9) (0.8) (4.0) (5.1) (7.1) (5.1) Consult factory for price and availability of adaptor cables for LVDTs and signal conditioners. 100

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