STARRETT-WEBBER GAGE BLOCKS - JW Donchin CO.

More documents

Recommendations

Info

STARRETT-WEBBERGAGE BLOCKSPrecision Gage Blocks, Standard Reference Bars, Angle Gage Blocks,True Squares, Optical Polygons and TargetsThe first part of this section is devoted to GAGE BLOCKS andSTANDARD REFERENCE BARS.Gage Blocks – Major Product CharacteristicsPrecision gage blocks are the primary standards vital todimensional quality control in the manufacture of parts. The fourmajor characteristics that are necessary for a precision gageblock are accuracy, surface finish, wear resistance anddimensional stability. Other factors are corrosion resistance,hardness, thermal conductivity and coefficient of expansion.The base material used for gage blocks is crucial in meeting theabove criteria. While many materials have been tried, the majortypes available today are:◆ Traditional high-grade steel gage blocks, which aregenerally used in shop floor environments◆ Tungsten Carbide gage blocks, which have the advantage ofbeing harder and longer wearing than steel. (Not availablefrom Webber.)◆ Ceramic gage blocks have an advantage over regular steel.They will outwear regular steel and they will not corrode◆ Chromium Carbide gage blocks are considered the top ofthe line – the finest available. They outwear regular steel andceramic. In addition, they will not corrode and are very stableand accurate, and have exceptional “wringing” qualitiescroblox ® Chromium Carbide – the superior gage blockmaterial. The reason that our Webber Gage Division emphasizesgage blocks made from Chromium Carbide is because they arethe most stable measuring devices ever developed.No one in the world except Starrett/Webber has produced theaccuracy and stability of our croblox ® Grand Masters. They wereproduced in 1955 of Chromium Carbide material to an accuracywithin one millionth of an inch (.0000254mm) and have beenchecked periodically by the U.S. National Bureau of Standardsand the U.S. National Institute of Standards and Technology(NIST) and have remained stable over this period.Other CharacteristicsAccuracyAll Starrett/Webber gage blocks meet or exceed all knownspecifications. The flatness, parallelism and surface finishnecessary to achieve the required accuracies are the same asor better than government requirements.StabilityStarrett/Webber gage blocks do not change in size exceptthrough normal wear. Gage block stability is a characteristic thatour Webber Gage Division has mastered with over seventy yearsof experience. Our gage blocks have withstood the test of time.HardnessSteel blocks have a Rockwell “C” hardness of approximately64-65. Chromium Carbide blocks have a Rockwell “C” hardnessof 71-73, with an unusually fine, hard grain structure whichgives them exceptional resistance to wear and abrasion.Thermal Conductivity and Coefficient of ExpansionThese are not important considerations when measurements aretaken in temperature-controlled environments. This is primarilydone when measuring to microinches or microns.On the shop floor, where precision measurements are rarely finerthan .0002 or 0.005mm, the coefficient of expansion of steel,chromium carbide and ceramics is so close as to be negligible.Thermal conductivity is important on the shop floor. However,because it takes time for a gage block to move to the sametemperature as the work piece, we recommend setting thegage block on a heat sink such as a large mass of metal thatis at the shop environment temperature.446
STARRETT-WEBBERGAGE BLOCKSNational Instituteof Standards and TechnologyNational VoluntaryLaboratory Accreditation ProgramCALIBRATION LABORATORIES NVLAP LAB CODE 200038-0WEBBER GAGE DIVISION / L.S. STARRETT CO.24500 Detroit RoadCleveland, OH 44145DIMENSIONALPhone: 440-835-0001 Fax: 440-892-9555NVLAP Code: 20/DO3Gage BlocksHow To Order Starrett Precision Gage BlocksGage Block Sets1. Order by catalog number.Individual Gage Blocks1. Specify Shape, signified on the page by the following symbols:2. Please specify if you require a Commercial Grade Calibration orMaster Grade Calibration. See the catalog page regarding ourAccreditied Gage Block Calibration Service near the end of thissection. A certificate of calibration provides individual readingson each block and provides traceability to NIST. Webber gageblock calibrations are NVLAP ® accredited by NIST. (We need theend user’s name and address to place on the certificate.)◆ Rectangular◆ Square◆ Heavy Duty•• •3. Specify if you require etched serial numbers. We can providenumbers up to a 6-digit maximum. (Our standard practice is toput the same etch number on each block in a set. Blocks aredifferentiated by their marked size.)The buyer of Webber products listed in this catalog agrees to the100% Relaxed Acceptance Rule contained in ASME B89.7.3.1(Guidelines for Decision Rules: Considering MeasurementUncertainty in Determining Conformance to Specifications.)Products may not be rejected by the purchaser unless hismeasurements exceed the published tolerances by more than hisuncertainty of measurement.NVLAP ® accreditation does not constitute an endorsement of anyproduct by NVLAP ® or any agency of the U.S. government.2. Specify Material (croblox ® , steel, or ceramic)3. Specify Unit of Measure (inch or metric)4. Specify the Size5. Specify Special Lengths, if applicable (Rectangular Only)• Thin block sets (28 pc. inch and 17 pc. metric) are all 1.115(28.3mm) long. Specify “SS” length• .050, .100, and .150 blocks in inch 81-92 pc. sets are1.380 long. Specify the Long length, “L”• .100 blocks contained in the 36, 38, and 43 pc. sets are1.380 long. Specify the Long length, “L”6. Specify Accuracy Grade (see next page)7. Please specify if you require a Commercial GradeCalibration or Master Grade Calibration. See the catalog pageregarding our Accreditied Gage Block Calibration Service nearthe end of this section. A certificate of calibration providesindividual readings on each block and provides traceability toNIST. Webber gage block calibrations are NVLAP ® accredited byNIST. (We need the end user’s name and address to place on thecertificate.)8. Specify if you require etched serial numbers. We can providenumbers up to a 6-digit maximum.447
Page 1: STARRETT-WEBBERGAGE BLOCKS
Page 5 and 6: STARRETT-WEBBERGAGE BLOCKSGage Bloc
Page 7 and 8: Rectangular croblox ® - Inch Syste
Page 9 and 10: STARRETT-WEBBERGAGE BLOCKSRectangul
Page 11 and 12: Rectangular Gage Block AccessoriesS
Page 13 and 14: STARRETT-WEBBERGAGE BLOCKSInternal
Page 15 and 16: STARRETT-WEBBERGAGE BLOCKSIndividua
Page 17 and 18: STARRETT-WEBBERGAGE BLOCKSHeavy-Dut
Page 19 and 20: STARRETT-WEBBERGAGE BLOCKSMetric Sy
Page 25 and 26: STARRETT-WEBBERGAGE BLOCKSSquare St
Page 27 and 28: STARRETT-WEBBERGAGE BLOCKSIndividua
Page 29 and 30: STARRETT-WEBBERGAGE BLOCKSAngle Gag
Page 31 and 32: STARRETT-WEBBERGAGE BLOCKSTrue Squa
Page 33 and 34: STARRETT-WEBBERGAGE BLOCKSOptical P
Page 35 and 36: STARRETT-WEBBERGAGE BLOCKSAccredite

STARRETT-WEBBER GAGE BLOCKS - JW Donchin CO.

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?