Dragon Precision Microplan Archimede HR Manuale utente
“ARCHIMEDE HR” PART LIST
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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
2014©Microplan®
ARCHIMEDE_HR_en.indd
Versione: 14/11.20
ARCHIMEDE
Components and accessoires
ARCHIMEDE
Large diameters measuring instrument
Battery charger
USB Card with «ARCHIMEDE» Software
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-off)
In case of low battery automatically Archimede shuts off to prevent malfunctions and
inaccurate readings.
With battery fully charged Archimede can work up to 8 hours of continuous duty.
6
BATTERY
CHARGING
The instrument is supplied with USB Travel Adapter battery charger. You are not
allowed to use other chargers than the provided, that may damage 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.
Connect the supplied battery charger to the round plug on the Archimede arm and let
it charge for about 16 hours. Do not leave the battery charger constantly connected
to the AC power, to prevent overheating.
The bicolor LED, located on the main panel of the instrument shows two states with
the level of charge of the instrument:
Red led = batteries charging
Green led = batteries fully charged
7
THE MEASURING PRINCIPLE
OF THE ARCHIMEDE HR
The Archimede HR 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 offers advantages in terms of:
1 • capability to measures outside diameters from 500 to 6000 mm with a
single instrument and with a single person,
2 • capability to perform measurements of internal diameters from 1100
to 6000 mm with a single instrument and with a single person,
3 • capability to perform up to 10 measurements on the same circumference and
consequently obtain the values of min, max and 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 uncertainty in the diameter measurement is directly influenced by
the shape of the cylinder. This means that to achieve an accurate measure with Ar-
chimede HR with its stated Accuracy, a cylindrical piece of diameter of 1.000 mm
must have a circularity error of ± 0.04 mm for the HR model, of ± 0.06 mm for the
HA model and around ± 0.12 mm for the LA model. Otherwise it becomes necessary
to perform several measurements on the circumference and detect the value of the
average diameter.
DIAMETRO ARCHIMEDE LA ARCHIMEDE HA ARCHIMEDE HR
500 ± 0.045 mm ± 0.02 mm ± 0.018 mm
1000 ± 0.12 mm ± 0.06 mm ± 0.043 mm
1500 ± 0.245 mm ± 0.12 mm ± 0.085 mm
2000 ± 0.42 mm ± 0.21 mm ± 0.143 mm
2500 ± 0.645 mm ± 0.32 mm ± 0.218 mm
3000 ± 0.92 mm ± 0.46 mm ± 0.310 mm
4000 ± 1.62 mm ± 0.81 mm ± 0.543 mm
5000 ± 2.52 mm ± 1.26 mm ± 0.843 mm
6000 ± 3.62 mm ± 1.81 mm ± 1.21 mm
Tab.1 Archimede Uncertainty
However, it is possible to measure an irregular cylinder repeating the measurement
on different arcs of the same cylinder, to obtain the value of the average diameter.
In any case, the max measurement uncertain0ty for Archimede HR is shown in Tab.1
9
IN CASE OF ELLIPTICAL CYLINDERS IS IT POSSIBLE
THE MEASUREMENT WITH ARCHIMEDE HR?
If the cylinder to be measured has a form error (ie. Elliptical cylinder), the instrument
Archimede HR returns the value of the diameter of a circle passing through the three
points of contact on the cylinder that is being measured: this last could have a
center not coincident with the workpiece one. This does not mean that Archimede
HR returns a bad measurement.
Keep in mind that in case of elliptical cylinders (ellipses) the calculation performed
by Archimede HR 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
diametrically opposed, 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 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 encountered of circularity error, it’s useful
to divide the cylinder circumference up to 10 arcs of 36°. 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 HR may not match with the value of the
diameter obtained with a two points measuring instrument as a caliper; that unlike
Archimede HR cannot detect circularity errors due to a number of deformation lobes
greater than 2 (the case of an irregular ellipse).
When we use a micrometer gauge 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 different 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 two deformation lobes (ellipses).
Indice
