Page 422 - catalgo33

surfAce plAte cAlIbrAtIon products
St arrett-Webber GaGe blockS
plAneKAtor KIts
The Planekator measures the overall flatness of your surface plate. It enables you to take direct indicator readings of your
surface plate with autocollimator-accuracy, but without the complicated mathematics of the autocollimator. When used in
conjunction with a Starrett Repeat Reading Gage, you'll have a very accurate idea of the flatness of your surface plate.
Each kit includes a precision granite straight edge, one adjustable support, one fixed support, a certified 0.00002" dial indicator
and an indicator carriage. The entire kit is shipped in a heavy-duty travel case. The straight edge comes equipped with lifting
handles, correction tape indicating the accuracy at 1" intervals, and includes a NIST-traceable certificate that meets ISO/IEC
17025 requirements.
The Planekator straight edge should be at least equal to the full width, and at
least equal to 50% of the length of the largest surface you will be
inspecting. For example, a 36" planekator straight edge can
be used to calibrate any surface up to 36" x 72".
Straight Edge
Part No. Size (in) Total Weight of Kit (lbs) Accuracy (in) Planekator
80500 24 50 0.000050
80501 36 80 0.000075
80502 48 115 0.000100

repeAt reAdInG GAGe
High-precision, fast checking of surface plate repeatability with readings taken with a dial indicator.
Detects local error, not overall flatness. The base has an adjustment knob for zero-setting the
cartridge-type gaging head, and all contact points resting on the granite, including the
contact point of the gaging cartridge, are carbide and lapped to a fine finish.
The instrument also accommodates AGD indicators with .375" (9.5mm) diameter stems.

Repeat Reading Gage
EDP Description
81320 Repeat Reading Gage
81321 Storage Case
81322 Travel Case Repeat Reading Gage
81850 0.00002" Dial Indicator

GrAnIte cAlIbrAtIon servIces
Starrett calibration and resurfacing services are available for all types and brands of granite surface plates. When certification of surface
tolerance is required, recalibration service with an autocollimator will be provided with accuracy traceable to the U.S. National Institute of
Standards and Technology.
Calibration and resurfacing of surface plates, tri-squares, master squares, master angles, V-blocks, parallels and straight edges is available at
our at Waite Park, MN location.
Resurfacing can also be done in your plant, saving crating and shipping costs as well as equipment down time. The cost is based on a square
foot plate area with additional charge for travel. For a quotation, send us a list of plates, their sizes and the flatness tolerance required.
When resurfacing is done in your plant, tolerances for repeat reading of measurement will be per U.S. Federal Specification GGG-P-463c,and
ASME B89.3.7-2013. Closer repeat reading tolerances of 25, 50 and 100 millionths can only be assured if the resurfacing is done at our facilities.
Recalibrations are provided by our Calibration Lab which is A2LA accredited.
Tolerances for Repeat Reading of Measurement
Full Indicator Movement (F.I.M.) in Microinches and (Microns)
Diagonal Inches (mm) Grade AA Grade A Grade B Obtained
Through 30" (750) 35 (.9) 60 (1.5) 110 (2.8)
30-60" (750-1500) 45 (1.1) 70 (1.8) 120 (3)
60-90" (1500-2250) 60 (1.5) 80 (2) 160 (4) When not Specified
90-120" (2250-3000) 75 (1.9) 100 (2.5) 200 (5)
120-150" (3000-3800) 90 (2.3) 120 (3) 240 (6)
Over 150" (3800) 100 (2.5) 140 (3.6) 280 (7)
All Sizes 25 (.6) 50 (1.3) 100 (2.5) When Specified
A repeat reading gage detects minute variations of the surface within the unilateral flatness tolerance of the whole surface.

422