KOBA Step Gage, Artifact

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Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 1111
Fax (586) 7592423
Step GagesStep GagesStep GagesStep Gages A complete system for monitoring coordinate
measuring machines.
Measurement and StandardsMeasurement and StandardsMeasurement and StandardsMeasurement and Standards
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
2222 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
Step Gages, At a GlanceStep Gages, At a GlanceStep Gages, At a GlanceStep Gages, At a Glance
⊕ Available in five standard
lengths: 420, 620, 1020,
1540 and 2020mm
⊕ The gage body is manu
factured using special
steel, stabilized by a long
aging process which
provides dimensional
stability.
⊕ Material expansion is
U = 11.5 x 106 / 6° C
⊕ Distortionfree support of the gaging cylinder faces is accomplished
by a patented, machined form shaped to hold each cylinder firmly in
its installed position.
⊕ The unique form of the KOBAstep body configuration produces
identical principal planes that provide the neutral bend feature at
specified, marked bearing points along the gage body.
⊕ The gage blocks and faces are cylindrical in form with lapped faces
on either end of the cylinder. As the cylinder approaches the gaging
surface it is tapered to allow easy access for measurement and
cleaning of the gage faces.
⊕ Ceramic gage blocks
⊕ Gage faces are spaced in 20mm nominal increments. The diameter
of the gage faces is 5mm. Gage cylinders are available in either steel
or ceramic.
⊕ Gage faces are not set to exact nominal positions for measurement—
this provides higher testing variation against a certified nominal data
base. KOBA sources for certification are PTB, NIST, DKD and Works
(inhouse).
⊕ Access for probing gage faces is available through:
a) holes on the side of the body,
b) the longitudinal groove or
c) at either open end of the gage body.
⊕ KOBAstep is ideal for horizontal and vertical quills operating from
“underthetable” type machines.
⊕ Gage faces are held along the center line fiber of the gage body which
allows the gage to be held horizontally, vertically or on various inclines
without spacing deformation, this is accomplished through the gages
neutralbend body design. ⊕ The swivel base option provides proper clamping and support at
bearing points and allows angular positions to be made quickly. ⊕ Leveling feet and handles provide fast and safe setups ⊕ Purposebuilt transport containers minimize the risk of damage
during transportation. ⊕ Also available in a “mini” version for users of smaller CMMs
6
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 3333
Fax (586) 7592423
Step Gages for Checking the Accuracy of Step Gages for Checking the Accuracy of Step Gages for Checking the Accuracy of Step Gages for Checking the Accuracy of
Coordinate Measuring MachinesCoordinate Measuring MachinesCoordinate Measuring MachinesCoordinate Measuring Machines
In industrial metrology, actual physical bodies of known length which can
be contacted by mechanical sensors have an important part to play as
reference standards when measuring geometric parameters. They have
become increasingly important for assessing the accuracy of 2 and 3axis
coordinate measuring machines (CMMs) that employ mechanical sensors.
Checking the length measurement uncertainty has proved to be a highly
informative and economical method for the acceptance testing and the
ongoing monitoring of CMMs. The KOBAstep stepgage can be used for
this in a variety of ways, given the advantages of unidirectional and bidirec
tional targeting and of measurements from all the gage faces along the line
of measurement in succession while needing only a short time for prepara
tion and measurement. Local errors can be detected in the CMM and char
acteristics can be derived for individual coordinate axes of the machine.
With the aid of the length measurement uncertainty, the manufacturer or
user can specify and check the accuracy of a coordinate measuring
machine to establish its suitability for length measurement. This fundamental
task in metrology is of particular importance since, in practice, the majority
of measuring requirements are for the measurement of lengths. “Length
measurement uncertainty” is defined by VDI/VDE guideline 2617 part 2.1
as the uncertainty with which a CMM allows the precisely known distance
between two points on two parallel gage faces situated in succession along
a line of measurement to be remeasured. The illustration below shows a
measurement of this kind being made, taking as an example an individual
parallel gage block with an outside length Le which is arranged obliquely in
three dimensions and whose length is remeasured by successive contacts
with the block of the probe head in positions I and II.
Individual gage blocks arranged obliquely in three dimensions on the
table of the CMM, showing an outside dimension Le measurement.
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
4444 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
On the stepgage, spacing of different kinds for making test measurement
are all available simultaneously as follows:
⊕ Outside dimension Le, e.g. with the probe head in positions
I and II (figure 2)
⊕ Inside dimension Li, e.g. with the probe head in positions
III and IV (figure 3)
⊕ Rear face to rear face dimension Ls, e.g. with the probe head in
positions III and V (figure 3)
⊕ Front face to front face dimension, Lx, e.g. with the probe head
in positions VI and IV (figure 3)
⊕ Positional length Lp of a gage face from the datum gage face,
e.g. with probe head in positions VI and 0 (figure 3)
The illustrations show only one of many options available for each type and
size of spacing. The value of the length measurement uncertainty is gener
ally given in the form of a length dependant formula: U = A + K x L </= B.
Figure 2 (above), Castellated step gage arranged obliquely in three dimensions
on the table of a CMM, with an outside length Le being measured.
Figure 3 (below), Step gage arranged obliquely in three dimensions on the table of
a CMM, showing measurement of an inside dimension Li, of an outside dimensions Ls
or of the position Lp of a gage face as a distance from the datum face.
A distinction is made between the figure U1, specified for one dimensional
test measurements along a coordinate axis (with terms A1, K1, B1), the figure
U2 for two dimensional test measurements made diagonally in a coordinate
place (with terms, A2, K2, B2) and the figure U3 for three dimensional test
measurements made diagonally in the three dimensional space defined by
the coordinates (with terms A3, K3, B3).
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 5555
Fax (586) 7592423
Length Measurement Length Measurement Length Measurement Length Measurement
Uncertainty PlotUncertainty PlotUncertainty PlotUncertainty Plot
For the purposes of graphic
analysis, the differences
∆ L = La  Lr which are found and
plotted, with the correct signs,
for the individual measured
lengths and runs in a length
measurement uncertainty grid (right). The top and bottom boundary lines
produce a funnel shaped outline with the neck of the funnel measuring
2A (A = the figure specified by the manufacturer for length measurement
uncertainty, irrespective of length). 95% of all the test measurements must
lie within, or on, the boundaries. A quantitative analysis is made simply by
counting the number of measurements which lie outside the boundary lines.
Gage Face Position PlotGage Face Position PlotGage Face Position PlotGage Face Position Plot
It is possible to test the positions Lp of the gage faces as distances from the
datum face using the stepgage. If the relevant length errors ∆ Lp given by
position measurement in line with VDI guideline 2617 part 3 are entered in
a plot, then it is possible to see both the position of the test length and
also the sequence, for example, if the measurement points in a run are
connected by straight lines. With individual gage blocks this is not possible
because they do not have any true common reference point and are not
situated on a measurement line.
A gage face position grid (right),
similar to the length measure
ment uncertainty grid, is used
for analysis. The outline is sym
metrical and similar in shape to
a butterfly with a width of 1A
across the waist. The parame
ters in this case correspond to
the appropriate figures A1, K1, B1
and so on. As this grid is moved along the measured length L, at least 95%
of all the measurements must always lie within or on the boundary lines,
meaning that all the measurement points must do so consistently whatever
the position of the waist. This ensures that any pairing of two gage faces
(even from different runs) in the form of outside, inside or facetoface dimen
sions will also lie inside the funnel of the length measurement uncertainty
grid. Thus, the grid forms a combined graphic expression of both the equa
tions given above for all points of measurement.
Comparisons Between the Test Standards Comparisons Between the Test Standards Comparisons Between the Test Standards Comparisons Between the Test Standards
Gage Blocks and Step GagesGage Blocks and Step GagesGage Blocks and Step GagesGage Blocks and Step Gages
Apart from the stepgage, parallel gage blocks are the reference standards
known for the greatest accuracy of length. However gage blocks are rela
tively flexible and have to be mounted at the AIRY points (symmetrical spac
ing a = 0.57735 x L) so that they are free of bending moments if the parallel
ism of the gage faces is to be maintained. The gage blocks for the individual
test lengths can be individually placed one behind the other for shorter
lengths and next to one another for longer lengths. When this is done, how
ever, there is no way of obtaining the different gage points along a line of
measurement which are desirable for measurement purposes.
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
6666 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
Special Features and Advantages of the KOBASpecial Features and Advantages of the KOBASpecial Features and Advantages of the KOBASpecial Features and Advantages of the KOBAstepstepstepstep©©©© GageGageGageGage
The step gage has a castellated body containing a large number of forward
and backward facing gage faces along a single line of measurement. This
line of measurement is the same for measurements between any faces and
the position of the workpiece, that is to say the orientation of the carrying
body only has to be determined once to find this line. There are numerous
possible combinations in various positions along the measurement line; the
actual number of different interface dimensions for a step gage with 26
castellations (i.e., KOBAstep with a nominal size of 1020mm) is 1326.
A special feature of the KOBAstep step gage is the fact that the actual gage
points are situated on the neutral fiber of the carrying body; this means that
there are no firstorder changes in length if the state of bending changes.
The configuration of the gage body and the fact that the line of measure
ment is situated on the neutral fiber prevents any increase in the distance
between the gage faces at the points where the carrying body is supported
and also prevents them from moving closer together at intervening points.
In the KOBAstep step gage, which is neutral in bending, cylindrical gage
blocks are fixed in position individually in an internal longitudinal groove
formed in a steel 55 x 55mm steel carrying body. The axis of the gage
blocks is situated on the fiber of the gage body which is neutral in bending
and they form a series of castellations; this arrangement provides excep
tional protection for the gage faces. The strength of the carrying body and
the fact that the lengths do not vary if there are changes in bending to which
it is subject, mean that the KOBAstep step gage can be mounted in a wide
variety of fashions, e.g. cantilevered with “zero position” support or with
support at the Bessel points.
AccessoriesAccessoriesAccessoriesAccessories
The range of accessories available for use with the step gage, such as
swivel support and base, allows the gage body to be mounted on the CMM
in such a way as to be free of torsion. A support of this kind produces a
particularly stable connection between the step gage and the table of the
coordinate measure machine (figures 7, 9 and 10)
The combination of the step gage and its accessories produces a complete
system for making an overall check on the CMM. One particularly important
point is that the procedure of checking the coordinate measuring machine
can be carried out fully automatically under computer control.
Figure 7 (far left top) gage aligned
horizontally along the XY diagonal
plane , approx. 500mm above the
table, stylus probe vertical.
Figure 9 (far bottom left) gage aligned
horizontally along the XY diagonal
plane, turned 90°, stylus probe
horizontal, contact through cross
drills. Figures 7 and 9 are shown with
base and swivel support accessories.
Figure 10 (left) shows the KOBAstep
aligned vertically along the Zaxis,
standing in the accessory base.
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 7777
Fax (586) 7592423
TraceabilityTraceabilityTraceabilityTraceability
Since the acceptance or refusal of a coordinate measuring machine may
depend on the outcome of the length measurement uncertainty test, it is
advisable to always use officially calibrated testing equipment in order to
avoid unpleasant surprises and incorrect interpretations. The KOBAstep
step gage is available with either a DKD calibration certificate (German
calibration service, DKD) or Works calibration.
The length measurement uncertainties which can currently be achieved
with the step gage are:
⊕ DKD: U = 0.12µm + 0.6 x 106 x L (Length)
⊕ Works: U = 0.3µm + 0.8 x 106 x L (Length)
RecalibrationRecalibrationRecalibrationRecalibration
As is normal with all measurement standards, the KOBAstep step gage
should be recalibrated after a certain period. We recommend the first
calibration after one to two years and successive recalibration after two
to three years.
Alignment of the KOBAAlignment of the KOBAAlignment of the KOBAAlignment of the KOBAstepstepstepstep
To define the position and orientation of the KOBAstep respective to the
measuring line within the measuring volume, we recommend proceeding
as follows:
As the gage body with the fixed cylindrical gage blocks has been designed
symmetrically to both sides, one of the external side surfaces and the upper
external surface at the end of the large Ugroove can be used for alignment.
Any points which are as large as possible can be sensed at either the side
surface or at the upper external surface. Both places so defined are squared
off mathematically. A parallel line 27.5mm to the side surface and 30mm to
the upper surface is the measurement line situated on the neutral fiber.
It is also possible to use both ends of the 7 x 10mm interior groove for the
alignment and proceed in a similar way as before. The distance from the
wall of the groove and the floor of the groove to the line of measurement is
5mm in both directions.
Figure 11, KOBAstep vertically oriented along the Zaxis, standing in the base. This
alignment is also suitable for checking height gages as shown in Figure 12 (right)
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
8888 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
Practical UsePractical UsePractical UsePractical Use
Practical experience using the
KOBAstep step gage to check
the accuracy of coordinate
measuring machines and
access and interpret the results
has demonstrated the useful
ness and potentially high
information yield of the “length
measurement uncertainty”
method. The advantage lies in
the fact that the measurement
is carried out at precision gage
faces using the normal gaging
procedure and, in general, the
manufacturer’s standard processing software. It is a good idea to make full
use of the opportunities offered by the step gage since (a) the unidirectional
and bidirectional gaging of the inside and outside dimensions, (b) the di
mensions between similarly oriented surfaces and successive dimensions
from a given point occur even in the routine measurement of work pieces
and (d) the measurements which have been obtained can all be correlated
with one another as desired even after the event. What is more, a series of
measurements at all the gage faces in succession provides a large amount
of interrelated information and requires only a short time for measurement.
Since the length measurement uncertainty characteristic depends very
much on the geometry of the coordinate measuring machine, the lines
along which measurements are made should be as follows:
⊕ 3 to 4 measurement lines which are diagonal in 3 dimensions (i.e.,
along the diagonals of an inscribed cube—at an angle of approximately
35°  or along the diagonals of the cuboid shape representing the
measured space).
⊕ 2 diagonal lines of measurement in each coordinate plane (i.e.,
along the diagonals of a square—at a gradient of 45°  or the diagonals
of a rectangle).
⊕ At least one line of measurement parallel to each coordinate axis.
At least 18 suitable lines of measurement have to be selected in order to
arrive at a complete definition of the 18 geometrical cuboid characteristics
of the entire measurement volume.
It must be stressed that reliable measurement results for a complex system
cannot be achieved unless stylus probes are included. Checking the CMM
without mechanical contact, i.e., without using a probe, will not result in a
comprehensive statement about the accuracy of the measuring machine.
Figure 13, KOBAstep shown with swivel support and
base, illustrated at various inclines.
Figure 14, KOBAstep, shown with
swivel support and base, size 1,
for accommodating a 1020mm
long stepgage.
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 9999
Fax (586) 7592423
Conducting Formal Acceptance Procedures and Monitoring the Conducting Formal Acceptance Procedures and Monitoring the Conducting Formal Acceptance Procedures and Monitoring the Conducting Formal Acceptance Procedures and Monitoring the
Precision of Machine Tools and Robotic Dimensional Gaging SystemsPrecision of Machine Tools and Robotic Dimensional Gaging SystemsPrecision of Machine Tools and Robotic Dimensional Gaging SystemsPrecision of Machine Tools and Robotic Dimensional Gaging Systems
The KOBAstep gage can be used for checking the positioning accuracies
of machine tools and articulatedarm robotic dimensional gaging systems,
applications where it offers the same elegant approach and speed as when
checking coordinate measuring machines. The swivel support and base
accessories are required for this application.
Regular use of the KOBAstep for monitoring dimensional gaging precision
of machine tools is essential to total quality assurance. Complete quality
assurance demands more than the mere precision dimensional gaging of
finished work and components; regularly monitoring the dimensional gaging
precisions of those machine tools employed in fabrication is indispensible.
Finished products must be machined to within prescribed dimensional
tolerances if they are to pass final acceptance checks. Regularly monitoring
machine tool dimensional gaging precision provides valuable information on
the degrees to which work and component dimensional tolerances are
maintained during machining operations.
Figure 15, KOBAstep installed on a swivel
support and base, shown here spanning
the major diagonal of the workspace of a
vertical milling machine equipped with a
dimensional gaging head.
Figure 16, KOBAstep shown horizontally
aligned along the xaxis of the rotary bed of
a machine tool equipped with a dimensional
gaging head.
Figure 17, KOBAstep shown aligned
vertically for checking the zaxis of a
machine tool equipped with a dimensional
gaging head
Figure 18, KOBAstep shown installed on
a flexible machining center to verify its
positioning accuracy (the center’s dimensional
gaging head is integrated into its tool chuck.)
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
10101010 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
KOBAKOBAKOBAKOBAstep Ministep Ministep Ministep Mini
A system for calibrating and monitoring
multisensor measuring instruments
and coordinate measuring instruments
of small measuring volume.
The KOBAstep mini is a step gage with
a reduced cross section and gage
block distance resized according to the
measuring length and measuring task.
The advantages of the regular sized
step gage, such as cylindrical gage
block embedded in the neutral fiber of
the carrying body and access on three
sides, have been maintained. The
length and distance of the gage blocks
were reduced to 10mm according to
the total lengths which allows recognition of local errors of the measuring
instrument. The cylindrical gage blocks are made of zirconia ceramic and
are corrosion and wear resistant.
The KOBAstep Mini system is completed by the swivel support, which is
included, allowing the Mini to be mounted horizontally, vertically or in the
volume.
Traceability to the National Length Standard is guaranteed by DKD, PTB
or Works calibration.
Standard Lengths:Standard Lengths:Standard Lengths:Standard Lengths:
Nominal Lengths,
MM
Number of
Castellations /
Probing Faces
Division,
MM
Overall Length,
MM
210 11 / 22 10 220
310 16 / 32 10 330
Includes: KOBAstep Mini with zirconia ceramic probing elements, base
and swivel support for positioning from 0° to 90° (horizontally or vertically)
and an aluminum storage case.
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 11111111
Fax (586) 7592423
Standard Nominal LengthsStandard Nominal LengthsStandard Nominal LengthsStandard Nominal Lengths
Nominal Length Nominal Length Nominal Length Nominal Length
MMMMMMMM
Number ofNumber ofNumber ofNumber of
Gage FacesGage FacesGage FacesGage Faces
OverallOverallOverallOverall
LengthLengthLengthLength
WeightWeightWeightWeight
kgkgkgkg
420 22 480 6.5
620 32 680 9.5
1020 52 1080 15.0
1540 78 1600 23.0
2020 102 2080 30.0
The nominal length of a step gage is the distance from the first gage face to the last gage face.
Special sizes on request up to 2500mm.
CrossCrossCrossCrosssection of holdersection of holdersection of holdersection of holder: 55x55mm Length of castellationsLength of castellationsLength of castellationsLength of castellations: 20mm
Space between castellationsSpace between castellationsSpace between castellationsSpace between castellations:
20mm (10mm for 210 and 310mm
step gages)
CrossCrossCrossCrosssection of cylindrical gage section of cylindrical gage section of cylindrical gage section of cylindrical gage
blocksblocksblocksblocks: 10mm diameter
The following characteristics are identical for all lengths listed above:
210 22 220 —
310 22 330 —
AccessoriesAccessoriesAccessoriesAccessories
Swivel Support Lockable in positions –50° to 50° in 5°
increments
Base, Size 1 For mounting swivel support to step gages
420, 620 and 1020
Base, Size 2 For mounting swivel support to step gage
1540 and 2020
StorageStorageStorageStorage
Step Gages 420, 620
and 1020
Includes one storage box for gage, clamps
and swivel support and one box for the base
CalibrationCalibrationCalibrationCalibration
PTB U = 0.2µm + 0.8 x 106 x L
DKD U = 0.2µm + 0.5 x 106 x L
Works U = 0.6µm + 1.5 x 106 x L
NIST U = 0.22µm + .18 x 106 x L
“L” is the distance between any measuring faces in meters.
Step gages 1540 and
2020
Includes one storage box for gage, clamps,
one box for the swivel support and one box
for the base
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
12121212 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
Step GageStep GageStep GageStep Gage
⊕ Ceramic Gage Blocks
⊕ Corrosion resistant body
⊕ Includes aluminum
transport / storage case
⊕ 210 and 310mm step gages
include a swivel support and
a base
Order Number Material Nominal
Length
Number of
Blocks
Contact
Points
KOB420STEPCER Ceramic 420 11 22
KOB620STEPCER Ceramic 620 16 32
KOB1020STEPCER Ceramic 1020 26 52
KOB1540STEPCER Ceramic 1540 39 78
KOB2020STEPCER Ceramic 2020 51 102
KOB210STEPCERS Ceramic 210 11 22
KOB310STEPCERS Ceramic 310 11 22
Swivel Arm Support:Swivel Arm Support:Swivel Arm Support:Swivel Arm Support:
⊕ Swivel arm and clamps
⊕ Swivels and locks in position
–50° to 50° in 5° increments
⊕ Includes aluminum transport /
storage case
⊕ Requires Base for use (base is partially visible in photo at left)
Order Number Description
KOB####SWISUP Locking, swivel support for Stepgages
(replace “####” with the nominal length of the step gage).
Note: 210 and 310 step gages include a swivel support.
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 13131313
Fax (586) 7592423
Step Gage Base 1 and 2:Step Gage Base 1 and 2:Step Gage Base 1 and 2:Step Gage Base 1 and 2:
⊕ Mounts swivel arm to
the step gage
⊕ Includes aluminum transport /
storage case
Order Number Description
KOB####Base1 Base for step gages 420, 620 and 1020
KOB####Base2 Base for step gages 1540 and 2020
(replace “###” with the nominal length of the step gage).
Note: 210 and 310 step gages include a base.
SOLUTIONS© “How it works”
KOBAstep gage
horizontal setup (above)
and vertical (right)
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
14141414 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
⊕ 210 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage case
KOB210STEPSET
Contents Description Qty
KOB210STEPCER Step gage, 210mm nominal length 1
— Swivel support for 210 step gage 1
— Base for 210 step gage 1
Case Case for step gage, swivel support &
base
1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
⊕ 310 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage case
KOB310STEPSET
Contents Description Qty
KOB310STEPCER Step gage, 310mm nominal length 1
— Swivel support for 310 step gage 1
— Base for 210 step gage 1
Case Case for step gage, swivel support &
base
1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 15151515
Fax (586) 7592423
⊕ 420 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage cases
KOB420STEPSET
Contents Description Qty
KOB420STEPCER Step gage, 420mm nominal length 1
KOB420SWISUP Swivel Support for 420mm step gage 1
KOB420BASE1 Base for 420mm step gage, size 1 1
— Fixing clamp 2
Case Storage case for gage 1
Case Storage case for base 1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Case Storage case for swivel and clamps 1
⊕ 620 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage cases.
KOB620STEPSET
Contents Description Qty
KOB620STEPCER Step gage, 620mm nominal length 1
KOB620SWISUP Swivel Support for 620mm step gage 1
KOB620BASE1 Base for 620mm step gage, size 1 1
— Fixing clamp 2
Case Storage case for gage 1
Case Storage case for base 1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Case Storage case for swivel and clamps 1
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
16161616 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
⊕ 1020 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage cases
KOB1020STEPSET
Contents Description Qty
KOB1020STEPCER Step gage, 1020mm nominal length 1
KOB1020SWISUP Swivel Support for 1020mm step gage 1
KOB1020BASE1 Base for 1020mm step gage, size 1 1
— Fixing clamp 2
Case Storage case for gage 1
Case Storage case for base 1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Case Storage case for swivel and clamps 1
⊕ 1540 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage cases
KOB1540STEPSET
Contents Description Qty
KOB1540STEPCER Step gage, 1540mm nominal length 1
KOB1540SWISUP Swivel Support for 1540mm step gage 1
KOB1540BASE1 Base for 1540mm step gage, size 1 1
— Fixing clamp 2
Case Storage case for gage 1
Case Storage case for base 1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Case Storage case for swivel and clamps 1
Measurement and Standards: KOBAstep Step Gages
Phone (586) 7592400
www.pmargage.com www.shoppwm.com 17171717
Fax (586) 7592423
⊕ 2020 Step Gage Set
⊕ Ceramic gage blocks
⊕ Corrosion resistant body
⊕ Includes swivel support, base
and storage cases
KOB2020STEPSET
Contents Description Qty
KOB2020STEPCER Step gage, 2020mm nominal length 1
KOB2020SWISUP Swivel Support for 2020mm step gage 1
KOB2020BASE1 Base for 2020mm step gage, size 1 1
— Fixing clamp 2
Case Storage case for gage 1
Case Storage case for base 1
Note: Set does not include certification, please request PTB, DKD, Works or NIST
certification if required.
Case Storage case for swivel and clamps 1
Body Description
PTB U = 0.2µm + 0.8 x 106 x L
DKD U = 0.2µm + 0.8 x 106 x L
Works U = 0.6µm + 1.5 x 106 x L
NIST U = 0.22µm + 1.8 x 106 x L
CertificationsCertificationsCertificationsCertifications
SOLUTIONS© How it works
All KOBAstep© step gages
are available with the following
certifications
Measurement and Standards: KOBAstep Step Gages
Fax (586) 7592423
18181818 www.pmargage..com www.shoppwm.com
Phone (586) 7592400
SOLUTIONS© How it works