TB 9-6625-2357-50
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Dial Indicator Calibrators, Federal Products Corp., Model 400B-1,
The TIMSCO Co., Model TY-1, and Starrett Co., Model 716 (13589315). DA form
3758-R (Calibration and Repair Requirements Worksheet) was used as the prime
data source in compiling these instructions. The equipment being calibrated will be
referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None
b. Time and Technique. The time required for this calibration is approximately 1
hour, using the physical dimensional technique.
2. Forms,
Records, and
Reports. Forms, records, and
reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration
Description. TI
parameters and
performance specifications which
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
0.0 to 1.0 in.
Range
Accuracy
0.0001 in. over entire range
Resolution
0.00005 in.
EQUIPMENT REQUIREMENTS
4. Equipment
Required. Table 2
identifies the
specific equipment to be
used in this
calibration procedure. This equipment is issued with Secondary Reference Calibration
Standards Set, NSN 4931-00-621-7878. Alternate items may be used by the calibrating
activity. The items selected must be verified to perform satisfactorily prior to use and must
bear evidence of current calibration. The equipment must meet or exceed the minimum use
specifications listed in table 2. The accuracies listed in table 2 provide a four-to-one ratio
between the standard and TI. Where the four-to-one ratio cannot be met, the actual
accuracy of the equipment is shown in parenthesis.
5. Accessories Required. The
accessories required for the
calibration are common usage
accessories, issued as indicated in paragraph 4 above, and are not listed in this calibration
procedure. The following peculiar accessory is also required for this calibration: Shaft
diameter adaptor; Split Bushing, Starrett (EDP56007).