Mitutoyo - Полный каталог инструмента - 2014 Английский язык
для размещения заказа - mitutoyo@mitutoyo-tools.ru
Quick Guide to Precision Gauge Blocks
Measuring Instruments
Definition of the Metre
The 17th General Conference of Weights and Measures in 1983
decided on a new definition of the metre unit as the length of the
path traveled by light in a vacuum during a time interval of 1/299 792
458 of a second. The gauge block is the practical realization of this
unit and as such is used widely throughout industry.
Selection, Preparation and Assembly of a
Gauge Block Stack
Select gauge blocks to be combined to make up the size required for (5) Gently overlay the faces of the gauge blocks to be wrung together.
the stack. There are three methods to use (a, b and c as shown below)
(1) Take the following things into account when selecting gauge blocks.
a. Use the minimum number of blocks whenever possible. according to the size of blocks being wrung:
b. Select thick gauge blocks whenever possible. a. Wringing thick b.Wringing a thick gauge c.Wringing thin gauge
c. Select the size from the one that has the least significant digit gauge blocks block to a thin gauge block blocks
required, and then work back through the more significant digits.
(2) Clean the gauge blocks with an appropriate cleaning agent.
(3) Check the measuring faces for burrs by using an optical flat as
E follows:
Cross the gauge blocks at 90 Overlap one side of a thin To prevent thin gauge blocks
in the middle of the measuring gauge block on one side of a from bending, first wring a
faces. thick gauge block. thin gauge block onto a thick
gauge block.
a. Wipe each measuring face clean. 23 23701534
b. Gently place the optical flat on the gauge block measuring face. mm
c. Lightly slide the optical flat until interference fringes appear.
Judgement 1: If no interference fringes appear, it is assumed that 14 237015
mm
there is a large burr or contaminant on the
measuring face. Rotate the gauge blocks Slide the thin gauge block Then, wring the other thin
d. Lightly press the optical flat to check that the interference fringes while applying slight force to while pressing the entire gauge block onto the first thin
disappear. them. You will get a sense of overlapped area to align the gauge block.
Judgement 2: If the interference fringes disappear, no burr exists wringing by sliding the blocks. measuring faces with each
on the measuring face. other.
Judgement 3: If some interference fringes remain locally while
the flat is gently moved to and fro, a burr exists 23 14
on the measuring face. If the fringes move along mm mm
with the optical flat, there is a burr on the optical
flat. 1237690 12376
e. Remove burrs, if any, from the measuring face using a flat, fine-
grained abrasive stone. Align the measuring faces with Finally, remove the thick
(4) Apply a very small amount of oil to the measuring face and spread each other. gauge block from the stack.
it evenly across the face. (Wipe the face until the oil film is almost Apply an optical flat to the surface
removed.) Grease, spindle oil, vaseline, etc., are commonly used. of one thin gauge block to check
the wringing state.
Irregular
interference fringes
m 23
m
1237690
Wipe the exposed measuring face(s) and continue building up the
stack, in the same manner as above, until complete.
E-17
mitutoyo@mitutoyo-tools.ru www.mitutoyo-tools.ru
