Gage Blocks
6. Anti-magnetic Nature Keeps Away Steel Powders 7. High Wringing Force An even, dense tissue can maintain a strong wringing force.
Grade and Application Refer to the following table to select the gage block grade according to usage.
8. Material of CERA block
Applications
Grade
Material
CERA Block (ZrO 2 )
Steel (Fe)
Carbide (WC-Co)
Silicon nitride (Si 3 N 4 )
Workshop use • Mounting tools and cutters
AS-1 or AS-2
Property
Hardness (HV)
1350
800
1650
1500
• Manufacturing gages • Calibrating instruments
0 or AS-1
Coefficient of thermal expansion (10 -6 /K) Flexural strength by 3-point bending (MPa)
9.3±0.5
10.8±0.5
5.5±1.0
2
1270
1960 120 20.6
1960
580
Inspection use • Inspecting mechanical parts, tools, etc.
0 or AS-1
Fracture toughness K1c (MPa•m 1/2 ) Young’s Modulus x104 (MPa)
7
12
6.5
• Checking the accuracy of gages • Calibrating instruments
00 or 0
20.6
61.8
28.4
Poisson’s Ratio Specific gravity
0.3 6.0 2.9
0.3 7.8
0.2
0.3 3.2
Calibration use • Checking the accuracy of gage blocks for workshop
K or 00
14.8 79.5
• Checking the accuracy of gage blocks for inspection • Checking the accuracy of instruments
Thermal conductivity (W/m•k)
54.4
16.7
9. Closest Expansion Coefficient to Steel The thermal expansion coefficient of a CERA Block is similar to that of a steel gage block. 10. Highly Resistant Against Drops and Other Shocks The CERA block material is one of the toughest ceramics materials. It is extremely difficult to crack under normal use.
Difference in dimension (m)
Grade AS-1: These gage blocks are intended for shop-floor use to set and calibrate fixtures, as well as precision instruments. Grade 0: This grade is used within an inspection area to verify the accuracy of plug and snap gages, as well as for setting electronic measuring devices. Grade 00: These higher accuracy gages are intended for use within a controlled environment by skilled inspection staff. Mainly used as reference standards for setting high-precision measuring equipment and for the calibration of lower grade gage blocks. Grade K: Gage blocks of this accuracy are intended for use within a temperature-controlled inspection room or calibration laboratory. They should be used as masters with certificates against other gage blocks which are calibrated by comparison. Combination of a Required Length Multiple combinations of gage blocks can be used to make a required length. Care should be exercised in the following points. 1. Use as few gage blocks as possible to obtain the required length. (Select thick gage blocks whenever possible.) 2. Select gage blocks starting with the one that has the least significant digit required, and then work up to ones with more significant digits. 3. There are multiple combinations for the integer part of a length. To prevent wear as much as possible, do not always use the same gage blocks. Example combination Required length = 45.6785mm For the 1mm-based gage block set (112 pcs.) 1.0005 1.008 Reference use • Checking the accuracy of gage blocks for calibration • For academic research K
3
Silicon nitride
E
2
Tungsten carbide
1
CERA Block
17 18
19
20 21 22 23
Temperature (C)
-1
Differences in the dimension between some materials and steel that are obtained when measuring testpieces with a length of 100mm at each temperature.
-2
-3
Features of Square Gage Blocks 1. Perfect wringing is possible using the center hole. After wringing the square gage blocks, an optional tie rod can be inserted through the center hole to fix the blocks using a screw. 2. A height reference standard can easily be made. A precision height reference standard can be made easily and inexpensively using accessories such as the plain jaw and block base. 3. A dedicated inspection jig can be easily made. A dedicated inspection jig for periodic inspection of instruments can be made easily and inexpensively. 4. A wide measuring surface with cross section dimensions of [24.1 x 24.1mm / .95 x .95”] is available. A square gage block can retain stable orientation both longitudinally and laterally. A wide range of application measurements can be made, including cutting tool positioning, angle measurement with a sine bar, taper measurement with a roller, and inspection of depth micrometers.
1.17 17.5
+ 25
45.6785mm For the 2mm-based gage block set (112 pcs.) 2.0005 2.008
Long and Ultra-Thin Gage Blocks Mitutoyo offers extra thin gage blocks from 0.10 mm to 0.99 mm (increments of 0.01 mm), as well as long gage blocks up to 1,000 mm as standard products.
2.17 14.5
+ 25
45.6785mm
E-4
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