The gauge block handbook Episode 10 pot

... 138 Step 1. The test and slave blocks are wrung down to the same platen and measured independently. The two lengths measured consist of the mechanical length of the block, the wringing film and the ... etc. If a check standard block is used it can be assigned to any of the unknown block positions. The name of the design is simply the number of blocks in the desig...

Ngày tải lên: 12/08/2014, 08:21

... fixed gauge, and the required accuracy of the gauge is 0.5 µm. If the size of the gauge requires a stack of five blocks to make up the nominal size of the gauge the accuracy of each block must ... slightly into the gauge block surface, a result of the surface finish of the block and the electromagnetic properties of metals. If the wringing plane and...

Ngày tải lên: 12/08/2014, 08:21

... only the 30 to 60 mm of the block near the surfaces. For blocks under 100 mm this is the entire block, and there is no problem. For longer blocks, there is a variable amount of the block in the ... If there is a burr on the block or platen, if there is particle of dust between the block and platen, or if the block is seriously warped, the entire face of th...

Ngày tải lên: 12/08/2014, 08:21

... laboratory has a gauge block measured at NIST every year for nine years, it is good practice for the lab to use the mean of the nine measurements as the length of the block rather than the last reported ... either the S block or the C block as the known length (restraint) for the comparison. This permits customer blocks of different materials to be calibrated...

Ngày tải lên: 12/08/2014, 08:21

... through to the gauge block surface G and the platen surface P. The other beam (reference beam) is directed through the compensating plate I to the plane mirror R. The beams are reflected by the surfaces ... terms of the speed of light to a set of master gauge blocks which are then used for the intercomparison process. Gauge blocks have been measured by interferom...

Ngày tải lên: 12/08/2014, 08:21

... wavelength to the block length the accuracy of the wavelength is of primary importance. The gauge block temperature is measured so that the block length at 20 ºC, the standard 102 during periods ... Square style blocks, such as the NIST long blocks, are positioned so that the gauge point is at the right in the viewing field of the interferometer. One to...

Ngày tải lên: 12/08/2014, 08:21

... XY SX CX YS YC XS XY XC SC YX SY CS Y Y Y Y Y Y Y Y Y Y Y Y Y − − − − − − − − − − − − == 12 11 10 9 8 7 6 5 4 3 2 1 1 1100 101 01 101 10 1100 1 1101 0 101 01 1101 0 101 10 100 11 1 1100 1100 1 100 11 −− −− −− −− −− −− −− −− −− −− −− − − =X (A.7) When the S block is the restraint (S – L) the ... often in the first part of the scheme. This allows block A to...

Ngày tải lên: 12/08/2014, 08:21

... the calibrated block is given by: L u = M u - M s + L s + (α s - α u ) (D.6) where L u is the calibrated length of the unknown block, M u is the measured value of the unknown block, ... chrome carbide gauge block: Top Contact: D = 6 mm F = 1 N V 1 = 86 x 10 -8 chrome carbide block V 2 = 43 x 10 -8 diamond sphere α = 2.231 * (1) 2/3 * (86 x 1...

Ngày tải lên: 12/08/2014, 08:21

... fixed gauge, and the required accuracy of the gauge is 0.5 µm. If the size of the gauge requires a stack of five blocks to make up the nominal size of the gauge the accuracy of each block must ... slightly into the gauge block surface, a result of the surface finish of the block and the electromagnetic properties of metals. If the wringing plane and...

Ngày tải lên: 20/06/2014, 18:20

... Master Steel Gauge Blocks (10 -6 /ºC ) Size Set 1 Set 2 (in.) 5 11.41 11.27 6 11.33 11.25 7 11.06 11.35 8 11.22 10. 92 10 10.84 10. 64 12 10. 71 10. 64 16 10. 80 10. 58 20 10. 64 10. 77 ... If there is a burr on the block or platen, if there is particle of dust between the block and platen, or if the block is seriously warped, the entire face of...

Ngày tải lên: 27/06/2014, 18:20