Instruction Manual
microbevel 1
English
TESA MICROBEVEL 1
Inclination
measuring instrument
1
microbevel 1
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TABLE OF CONTENTS
1 Introdution 4
2 Measuring instruments systems 4
3 Zero setting by reversal measurement (absolute zero) 5
4 Measuring 6
5 Absolute and relative measurements 7
6 Differential measurement 7
7 Measurement of surface flatness and deviation from the horizontal 8
8 Tilts measurements on workpieces subject to vibration 8
9 Power supply 9
10 Maintenance 9
11 Changing batteries 9
12 Technical data 10
13 Declaration of conformity AND warranty 11
14 General remarks about angles 11
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The different ranges are explained below according to the type of instrument.
Pressing the buttons + and - when ZERO mode
is chose will change the display by one unit.
For larger changes, the button must remain
pressed and the changes will gradually increase
in speed.
The MICROBEVEL 1 is provided with two measuring ranges, selected by the keys on the display.
The resolution and the range of the model are:
Adjustment Zero
M
OFF
Measuring
Changing Range
These values are also marked on the handle of
the instrument. The direction of tilt is indicated
by the position of the point to the left of the digital display.
3 ZERO SETTING BY REVERSAL MEASUREMENT (ABSOLUTE ZERO)
Using the reversal measurement is a simple way to determine the exact zero offset of the instrument
as well as the exact inclination of the surface where the instrument is placed.
Models with 0,01 and 0,001 mm/m resolution
Measuring range I ± 19,99 mm/m
Digital step value 0,01 mm/m ≈ 2˝
Measuring range II ± 1,999 mm/m
Digital step value 0,001 mm/m ≈ 0,2˝
Reversal
measurement
Direction X
Zero point deviation of
the instruments (Offset)
A + B
2
Direction X
Inclination of
the measured surface
A - B
2
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Process
• Carefully clean the measuring faces of the MICROBEVEL 1, and place it on a clean measurement table. The table surface should be
• accurate plane, and reasonably horizontal.
• Turn the range selector switch (1, fig. 1) to
either position I or II.
• Temperature: before zero-setting, the temperatures of the instrument and the surface
should be identical, and after setting the range selector switch the MICROBEVEL 1 should
be allowed to stand 1 min (for range l) and 10
min (for range II).
• Mark the exact position of the MICROBEVEL
on the table.
4 MEASURING
Before starting the measurement enough acclimatization time must be allowed for the instruments.
Place the instrument carefully to the required measuring spot. (Surface) and read the value on the
MICROBEVEL 1.
It is important to measure always in the direction of the cable connector, respectively the cable.
• Set the display to zero (rotary switch 3,
fig. 1).
• Turn the instrument 180 degrees and reposition in the same position on the table as before.
• Read off the tilt value, divide this by 2, and
turn the zero-setting switch (3, fig. 1) to show
the result on the display.
• Check for zero-setting accuracy by replacing
the MICROBEVEL in its original position on
the table. The previous value should again be
displayed, but the opposite tilt direction indicated
Example
Flatness measurement
of a surface plate
Measuring
direction
transversal
Reference instrument
Measuring direction longitudinal
Cable
Measuring instrument
Important
• Touch the instruments only at the handle (Temperature!)
• Measuring from left to right and from close to far
• Cable in measuring direction
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5 ABSOLUTE AND RELATIVE MEASUREMENTS
For determining the amount by which a surface
deviates from the true horizontal or vertical, we
use the following procedure in order to define
the absolute zero:
• Set to zero as instructed.
• Place the instrument on the workpiece surface or up to the vertical face to be checked.
• Set the required measuring range
• Read off the displayed value.
On horizontal surfaces, check the measurement
by turning the MICROBEVEL 1 through 180 degrees. The displayed value should be the same,
but the tilt direction opposite.
6 DIFFERENTIAL MEASUREMENTS
Normally, a differential measurement is a measurement with two instruments: the measuring instrument (A) and the reference instrument (B), measuring the angular difference between the two. This
means e.g. if the angular change in both instruments is the same, the displayed value (Difference
A-B)doesn’t change. In principle this is a special relative measurement.
After this procedure, the instrument will display
the effective deviation from the center of gravity.
This means that the value is an absolute angle of
the measured surface.
A number of measurements don’t require the
absolute zero as described above.
In the case of angular deviation between two
objects(lines, surfaces, guide ways). The
measuring instrument is placed on an object
and the diplayed value is changed to 0. This object will now be the relative zero. Then the instrument is relocated to a second object and the
displayed value of the angle is the angular difference between the two surfaces. If the display is
also 0, then the both surfaces are parallel.
In the following measuring tasks the differential measurement is especially used
• Measurement on object with vibrations imposed
• Measurements on unstable systems or objects
• It is also possible to do it with just one instruments, by noting the displayed value at every
position
• For determining the relative inclination of two
surfaces
• Place the MICROBEVEL 1 on the reference
surface
• Set the display to zero
• Place the instrument on the second surface
and read off the displayed value
• This value is the relative inclination of the two
surfaces.
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0,001 (mm/m) x 150 (mm)
= 0,00015 mm / 150 mm
7 MEASUREMENT OF SURFACE FLATNESS AND DEVIATION FROM THE HORIZONTAL
The surface being inspected should first of all be divided up into separate measurement sections,
each section being a straight line. By correlating the results obtained from each of these measurement sections in an appropriate manner, the flatness and deviation from the horizontal of large
surfaces can be determined. Proceed as follow:
• Establish the measurement sections according to the length of the MICROBEVEL 1 foot.
It’s preferable that the sections overlap slightly rather than leave gaps
• Position the MICROBEVEL 1 on measurement
section 1 and note the displayed value
• Work through the remaining measurement
sections successively, allowing the display to
stabilize before noting the value
• Plot the results graphically. The profile obtained represents the variations above and below the nominal datum line, and thus shows
the flatness errors and mean deviation from
the horizontal for the surface considered
• If this method is used for testing large surfaces, the analysis of the results can be timeconsuming and complicated. Considerable
optimization of the process is achieved by
the use of peripheral devices such as line recorders and calculators.Calculation method
(example)
• Measuring range selected: II
• Value of digital step: 0,001 mm/m
• Measuring section length: 150 mm
• Amount of error represented by one digital
step, referred to the length of the instrument
foot:
100 (mm)
8 TILTS MEASUREMENTS ON WORKPIECES SUBJECT TO VIBRATION
In this application two MICROBEVELs 1 are used, connected together by a special cable. One instrument is used for the measurement, the second as a compensation element.
A B
• Referring to the figure below, connect two
instruments with the special cable (special
accessories n° 053.60000), the plug with the
switch being inserted in the socket of instrument B.
• Place the two instruments side by side on a
truly horizontal measurements surface, and
set the same measuring range on each.
8
• Move the switch on the plug to make the red
mark visible.
• Set both displays to zero.
• Place the microbevel on the workpiece surface. The reading displayed by instrument B is
the difference in tilt of the two instruments.
microbevel 1
12 TECHNICAL DATA
Sensitivity ± 1 µm/m – ± 0,2 Arcsec ± 5 µm/m – ± 1 Arcsec
Measuring range I 2 mm/m – 400 Arcsec 10 mm/m – 2000 Arcsec
Measuring range II 20 mm/m – 4000 Arcsec 100 mm/m – 20000 Arcsec
Limits of error range I
<0,25 Full Scale Value
Limits of error range I
>0,25 Full Scale Value
Limits of error range II
<0,5 Full Scale Value
Limits of error range II
<0,5 Full Scale Value
Display
Stabilizing time
Analogue output range I
Analogue output range II
Digital output RS485 asynchron/ 9600 Baud, 7 bits, 2 stopbits, no parity
Zero setting range I ± 50 digits
Zero setting range II ± 500 digits
Hysteresis < 0,5 digital step
Temperature influence / °C maximum 0,1% Full Scale Value
Lifetime battery 100 - 200 hours
Battery type Size AA, 1,5V Alcaline
External power supply + 5 V DC 20 mW
Operating temperature 0 to + 40°C
Storage temperature -20 to + 40°C
– Minimum 0,05% of FS value
– Maximum 1% of measured value
– Minimum 0,05% of FS value
– Display range only
– Minimum 0,05% of FS value
– Maximum 1% of measured value
– Minimum 0,05% of FS value
– Maximum 1% of (2x measured value - 0,5 x FSV
Digital LCD, height 4 mm
3 seconds
1 mV / 10 µm/m – 1 mV / 2
Arcsec
1 mV / 1 µm/m
1 mV / 0,2 Arcsec
1 mV / 50 µm/m
1 mV / 10 Arcsec
1 mV / 5 µm/m
1 mV / 1 Arcsec
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13 DECLARATION OF CONFORMITY AND WARRANTY
Thank you very much for your confidence in purchasing this product. This product has been inspected. We declare under our sole responsibility that this product is in conformity with the technical
data as specified in this instruction manual.
On addition, we certify that the measuring equipment used to check this product refers to national
master standards. The traceability of the measured values is guaranteed by our Quality Assurance.
We guarantee this instrument against any fault of design, manufacture or material for a period of
12 months from the date of purchase. Any repair work carried out under the guarantee conditions
is free of charge. Our responsibility is limited to the repair of the instrument or, if we consider it
necessary, to its free replacement.
The following are not covered by the guarantee: batteries and damages due to incorrect handling,
failure to observe the instruction manual, or attempts by any non-qualified party to repair the instrument; any consequences whatever which may be connected either directly or indirectly with the
instrument supplied or its use.
(Extract from our General Terms of Delivery, December 1st, 1981)
14 GENERAL REMARKS ABOUT ANGLES
Every angle may be defined in different ways.
The most popular way is a definition in Degrees
/ Minutes / Seconds.
This is shown in the graph.
α
Such a definition is especially useful for larger
angles.
With an angular measuring instrument not only
an angle may be measured but also the height
of a certain point over a defined base length can
be calculated. for a profile of a line or a surface)
Due to this simple and reliable method a number of tasks are possible, especially for measuring guide ways and surface plates definition.
Example
Angle = Height related to a defined base.
e.g. 22 µm/m
Angle in α degrees / arcmin / arcsec
Height
measuring
α
point
Base length
Angle α = Height of the measuring point related
to a defined base.
Height of the measuring point = tan
α x length
of base
Height
measuring
α
point
in µm
Base length 1000 mm
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Example
Because the relation µm/m is 1/1’000’000 the
same relation can also be applied to micro inch/
inch.
Angle = Height related to a defined base.
e.g. 22 µm/m are equal to 22 micro inch/inch
or 0,000022 Inch / Inch
Step length L x
Length L in (mm or inch)
Base length 1 inch
α
Height
measuring
point
α
in µin
Height H
in
µm or µin
Height H x in µm
related to step length
Height H x in µin
related to step length
1 µIn = 0,000001 inch
Height H x in µm
related to step length
Height H x in µin
related to step length
1 µIn = 0,000001 inch
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Height H x µm =
Height H µm x Step length L x in mm
Length L in mm
Height H x µin = Height H µin x Step length L x in inch
Height H x µm = tan
Height H x µin = tan
α (arc sec)
3600
α (arc sec)
3600
Length L x mm
Length L x in x 1 000 000
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