Microplan ARCHIMEDE HR Manuale utente
LARGE DIAMETER MEASURING INSTRUMENT
USER MANUAL
HR MODEL
“ARCHIMEDE HR” PART LIST
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19
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81 Left arm in titanium
2 Right arm in titanium
3 Control Panel
4 Left support wheel
5 Right support wheel
6 Central support wheel
7 Lateral mechanical stop
8 Locking knob of central mechanical stop
9 Central mechanical stop
10 Locking knob of central mechanical stop
11 Left handle
12 Right handle
13 LCD Display
14 ON/OFF button
15 Bicolor led
16 Mini-USB input
17 “Save/Enter” button
18 MENU button
19 / MINIMUM button
20 / DISPLAY ROTATION
21 “Save/Enter” button
www.microplan-group.com
8
“ARCHIMEDE HR” PART LIST
1
7 4
10
18
19
5
2
11
9
12
6
3
13
7
14
20
21
15
16
17
81 Left arm in titanium
2 Right arm in titanium
3 Control Panel
4 Left support wheel
5 Right support wheel
6 Central support wheel
7 Lateral mechanical stop
8 Locking knob of central mechanical stop
9 Central mechanical stop
10 Locking knob of central mechanical stop
11 Left handle
12 Right handle
13 LCD Display
14 ON/OFF button
15 Bicolor led
16 Mini-USB input
17 “Save/Enter” button
18 MENU button
19 / MINIMUM button
20 / DISPLAY ROTATION
21 “Save/Enter” button
www.microplan-group.com
8
2019©Microplan®
ARCHIMEDE_HR_en.indd
Release: 19/03
ARCHIMEDE
Components and accessoires
ARCHIMEDE
Large diameters measuring instrument
Battery charger
USB key with «ARCHIMEDE» Soware
USB cable for battery charging and
PC connection
Manual
5
POWER
Archimede has an independent power supply with rechargeable batteries. The
batteries level is readable in the LCD display, the status indication is shown with
a small icon on the display:
Full charge
half charge
Low battery (auto-o)
In case of low battery Archimede automatically shuts o to prevent malfunctions
and inaccurate readings. In this case, it is necessary to leave the instrument
connected to the electrical power at least 30 minutes in order to reach the
minimum charge for a proper switching on.
With battery fully charged Archimede can work up to 8 hours of continuous duty.
Please use the instrument while connected to the battery charger only if extremely
urgent, in order not to have the power charge to influence the measurement
6
BATTERY
CHARGING
The instrument is supplied with USB Travel Adapter battery charger. You are
not allowed to use other chargers than the one provided, in order to avoid any
damage to the batteries and the electronic devices inside the instrument.
Connect the supplied battery charger to the USB plug on the Archimede arm and
let it charge for about 6 hours. As an alternative to the power supply, the device
can also be charged by connecting it to a PC USB port.
The bicolor LED, located on the main panel of the instrument shows two states
with the level of charge of the instrument:
Red led = battery charging
Green led = battery fully charged
7
THE MEASURING PRINCIPLE
OF THE ARCHIMEDE HR
The Archimede is a measuring instrument which detects a circumference passing
through the three points of tangency (ABC) between the cylinder to be measured and
the instrument support points.
This type of measurement oers advantages in terms of:
1 • Possibility to measures outside diameters from 500 to 6000 mm with a
single instrument and with a single person,
2 • Possibility to perform measurements of internal diameters from 1000
to 6000 mm with a single instrument and with a single person,
3 • Possibility to perform up to 12 measurements on the same circumference and
consequently obtain the values of the average diameter.
8
IS THE ARCHIMEDE HR SUITABLE
TO MEASURE ALL KINDS OF LARGE DIAMETERS?
Archimede HR is a device that due to its given flexibility, can be used in many production
fields. Its measurement principle allows to obtain the stated accuracy when measuring
cylindrical parts that do not have irregular shapes, such as those machined. The uncer-
tainty in the diameter measurement is directly influenced by the shape of the cylinder.
This means that, in order to achieve with Archimede an accurate measurement of a
cylindrical piece with a 1000 mm diameter, this must have a reduced circularity error.
Otherwise it becomes necessary to perform several measurements on the circumference
and detect the value of the average diameter.
DIAMETER ARCHIMEDE HR
500 ± 0.018 mm
1000 ± 0.043 mm
1500 ± 0.085 mm
2000 ± 0.143 mm
2500 ± 0.218 mm
3000 ± 0.310 mm
4000 ± 0.543 mm
5000 ± 0.843 mm
6000 ± 1.21 mm
Tab.1 Archimede Uncertainty
However, it is possible to measure an irregular cylinder repeating the measurement
on dierent arcs of the same cylinder, to obtain the value of the average diameter.
In any case, the max accuracy of measurement for Archimede is shown in Tab.1
9
IN CASE OF ELLIPTICAL CYLINDERS IS IT POSSIBLE THE MEA-
SUREMENT WITH ARCHIMEDE HR?
If the cylinder to be measured has a form error, Archimede will provide the value of the
diameter of a circumference passing through the three contact points on the cylinder
that is being measured. This could have a center not corresponding to the one of the
workpiece, but this does not mean that Archimede is returning a wrong measurement.
It is to be kept in mind that in case of elliptical cylinders (ellipses) the calculation
performed by Archimede for each measurement is related to the best fit circumference
passing by the instrument support points. This means that it is not possible to perform
a single measurement, but it is required to detect a series of measures (eg. 0°, 90°, 180°,
270°), from which obtain a value of Average Diameter.
In case it is necessary to measure a large size tube, if the shape error is high, it will not be
possible to determine a value of an average diameter of the piece, because the circularity
error of the cylinder makes it more similar to an ellipse or a polygon, that by definition
do not have geometric diameter.
10
HOW WE PROCEED TO DETERMINE THE VALUE OF
THE AVERAGE DIAMETER WITH ARCHIMEDE HR?
When you want to minimize the problem of circularity error, it’s useful to divide the
cylinder circumference in up to 12 arcs of 30°. On each arc is then taken the diameter
measurement, to obtain the value of the Average Diameter.
In case of measurement of a very irregular or deformed cylinder, the value of the average
diameter calculated by Archimede may not match with the value of the diameter
obtained with a two points measuring instrument; that unlike Archimede cannot detect
circularity errors due to a number of deformation lobes greater than 2 (the case of an
irregular ellipse).
When we use a micrometric gauge, a caliper or bore gauge for inner diameters, we are
using a two points measuring instruments. Such instruments are unable to detect the
circularity error in case of parts which have an odd number of lobes (3 or 5 lobes), also
if dierent angular position’s measurements are taken. With the two points measuring
instruments it is possible to estimate the circularity error only in the case of parts which
have an even number of deformation lobes (ellipses).
Indice
