Logitech Logitrace User manual

Logitrace
Roundness Measurement System
User’s Guide

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Contents
Safety Information........................................................ 3
Installation.................................................................... 3
Initial Setup .................................................................. 4
Normal Tracing..................................................... 4
Inverse Tracing .................................................... 4
Shape Compensation........................................... 4
Preparing to Trace........................................................ 5
Taking the Trace .......................................................... 6
Examining the Trace .................................................... 7
Reference Circle and Peak & Valley Circles ........ 7
Examining the Results.................................................. 7
Omission of Data..........................................................8
Selecting the Datum..................................................... 9
Changing Magnification or Filter................................. 10
Printing Results.......................................................... 10
Tabular Printout.................................................. 10
Graphical Printout options................................. 10, 11
Saving Results........................................................... 11
Electromagnetic Precautions...................................... 12
Low Voltage Directive................................................. 12

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LogitraceRoundness Measurement System
SAFETY INFORMATION FOR E.U. USERS
Mains Earth
WARNING: This equipment must be earthed (see also Electro-Magnetic
Precautions on page 44).
Refer to rating labels for the pre-set voltage and check that the equipment voltage
corresponds to the supply voltage.
Important: The wires in the power lead fitted to mains instruments are coloured in
accordance with the following code:
Green and Yellow - Earth
Blue - Neutral
Brown - Live
As the colours of the supply lead fitted to mains supply instruments may not correspond
with the coloured markings identifying the terminals in your plug, connections should
be made as follows:
Connect the green and yellow wire to the terminal marked with the letter E or
identified with the (earth) symbol.
Connect the blue wire to the terminal marked with the letter N or coloured black.
Connect the brown wire to the terminal marked with the letter L or coloured red.
The mains supply to the Logitrace Interface Unit should be protected with a 3A fuse.
Installation
The system will be supplied with an installation disc which should auto-start when
inserted into a CD reader on a PC running Windows 7 or 10, home or professional
versions. The software will be installed onto the hard drive within a folder named
Logitrace. Immediately after installation, the driver software for the software
protection key (dongle) will be launched and should be allowed to install on the host PC.
There will be a new Logitrace icon on the desktop after the installation process is
complete
Connect the supplied USB lead between the PC and the Logitrace interface and switch-
on power to the interface. The PC should now recognise that new hardware is
connected and search for the correct drivers (these have been installed from the CD).
When this process is completed, ensure that the software protection key is present and
then double-click on the icon to launch the program.

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Initial Setup
The Options Menu allows the user to
select the most suitable settings for
the application. The previous
settings will be recalled when the
system is started-up.
The measurement units can be either
Metric [millimetre (mm) or micro-
metre (um)] or Imperial [inches (ins.)
or micro-inches (μins.)] The
roundness chart will be shown in red
when the metric option is chosen and
in blue for the imperial option.
Normal Tracing is the usual choice
when tracing on the exterior of a
component. Inverse Tracing causes
the direction of deflection to be
reversed and is commonly used when
tracing the interior of a component.
By using a mechanical adaptor, the roundness mechanics can
usually be used to measure component Flatness and Squareness.
Changing the user selection allows the results to be displayed in the
correct format. The results are not meaningful unless a radius of
measurement is specified. This is entered by selecting Radius
from the Options menu.
The relationship between Concentricity and Eccentricity is simply
that Concentricity is twice Eccentricity. Selection between these two items allows the
user to choose whichever term is more suitable for the application.
The ‘direction of rotation’ refers to the direction that the trace is drawn on the chart and
it will be chosen to suit the mechanics. Note: for the type of mechanics with a fixed
stylus and a rotating component then the direction of rotation of the trace is the reverse
of the direction of rotation of the component.
When the Shape Compensation option is enabled, the system will apply a
mathematical correction to the tracing to correct for shape errors introduced by the
component being off-centre. A nominally round but substantially off-centre component
will appear to be kidney shaped (this shape is called a limaçon). After the Least
Squares centre of the limaçon is found, the system can correct the shape, as it appears
on the screen, to restore circularity. If you find that this option is not suitable for your
application, you can switch it off.
The Customised Stylus Length option allows the user to use a non-standard length of
stylus. When a length is entered, it will be retained by the system until it is changed by
the user.
Other items on this menu will be discussed later.

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Preparing to Trace
Selecting the menu item Setup or clicking on the
Setup Icon (fifth from left) brings up a dialog box
showing the deflection of the stylus and allowing
control of magnification and an aid to centring.
Ensure that the stylus setting is correct before
attempting to centre the component. If a non-
standard (or not-listed) stylus is being used then
the setting should be Custom. (You must enter
the actual stylus length within the Options menu
–the Custom selection will not appear until a
length value has been entered.)
Next, choose a filter appropriate to the application. Choose the lowest value (least
amount of filtering) that is usable. Do not attempt to centre the component with the
15-500 filter selected. You can always change the filter after the trace has been taken or,
if you prefer, change it just before the trace is taken. Begin with the lowest level of
magnification and use the following procedure to centre a nominally cylindrical work
piece:
1. Set the stylus force and bias by means of the force control on the pick up head.
2. Rotate the turntable and/or head centring and levelling knobs to their mid
positions.
3. Place the work piece centrally on the table using the concentric circles as a guide.
4. Bring the stylus to the appropriate height for measurement by moving the table
up or down or by changing the height of the pick-up on the support column.
5. Radially adjust the pick-up until the stylus is near to the surface to be measured.
Rotate the table or measuring head by manual means and observe the variation
in the gap between the stylus and work piece. If necessary, improve the
centrality of the work piece by tapping with, for example, the handle of a
screwdriver.
6. Radially adjust the pick-up position until the stylus contacts the work piece and
the pointer of the centring meter moves towards the mid scale mark. Rotate the
turntable/measuring head by hand and observe the swing of the meter pointer.
At this stage, it may be possible to improve the centring of the component by
lightly tapping the work piece after detecting the maximum or minimum
deflected positions.
7. To refine the centring, bring the stylus position in line with the centring
adjustment of the head or table. Using the mechanical adjustments of the
machine, bring the centring indicator exactly to the centre position. Then rotate
the table/measuring head through 180° and observe the deflection on the
centring meter. Adjust the centring of the table or head to reduce the deflection
by half. Move the indicator to the centre of the scale by manually moving the
stylus on the column/head or electronically on the computer using the left and
right cursor keys.
8. Turn the component/measuring head through 90° and repeat the centring
procedure of section 7. Further refine the centring by this method until the
amplitude of the pointer swing is reduced to a minimum.
9. Progressively increase the magnification settings and at each stage, refine the
centring if necessary. When the appropriate magnification is reached, or at the
point that no further reduction of the amplitude of the pointer swing can be

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achieved, the work piece is centred as well as roundness will allow and a
measurement can be undertaken.
10. If the pointer moves outside the green area (and into the red) then the
magnification must be reduced or you must make further attempts to improve
the centring.
TIP: You can use the mouse both for controlling electronic centring and for changing
magnification. However, it is usually more convenient to use the left and right cursor
keys to control centring and the up and down cursor keys to change magnification.
When you are satisfied that the component is reasonably centred at the degree of
magnification that you wish to use then press the button labelled Trace (or press T).
Note: You can start a trace without using the setup dialog; if, for instance, you are
repeating the trace and are sure that the component is centred correctly. Simply select
the Trace menu option or click on the Trace icon (fifth from the left).
Taking the Trace
The screen will show Waiting for Trigger. The trigger is an
electronic signal that is generated by the mechanics at the 0 degree
point of the trace (this is usually when the mechanics is at the “three
o’clock position”). The trigger signal is used for timing and must be
seen twice after the Trace command is given before the trace will
start to appear. This can take over one minute on slowly moving
mechanics.
As soon as the second trigger is seen, the Waiting for Trigger
message will change to Reading Data and the trace will start to
appear on the screen. Immediately after the trace is completed, the
whole screen will be redrawn with the trace shown centrally on the
chart according to the reference standard that has been selected –
unless the View option Raw Data has been selected (see next
section).

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Examining the Trace
You can test the roundness of the traced
components against any (or all) of the
reference standards. The software will
calculate the centre of the trace according to
the standard chosen and redraw the trace on
the new centre. This causes any undulations
or irregularities to appear slightly differently
but angles and amplitudes are maintained. If
you wish to review the trace as it was taken
then you can select Raw Data. In this case
no results will be shown.
You can choose to show or not show the Reference Circle and/or Peak & Valley
Circles. The system will remember the chosen setting after the software is closed down.
The View menu also provides the facility for showing or not showing the Toolbar
(which contains the icon buttons), the Status Bar (which is at the bottom of the screen)
and the Digital Meter which only appears within the Setup dialog underneath the
deviation pointer.
Other items in the View menu will be discussed later.
Examining the Results
The results box is displayed whenever the trace is tested against one of the reference
standards.
The Osymbol represents roundness and is the calculated as the
deviation between peak and valley for the measured trace.
The Esymbol represents eccentricity and is the displacement
between the centre of the reference circle and the datum axis
[which is the spindle unless another datum reference has been
chosen (see later)]. The Esymbol will be replaced by two
concentric circles representing concentricity if that option has
been chosen (see Initial setup).
The angle symbol represents the value of the angle of a line
drawn from Datum to the centre of the reference figure (often
referred to as “the angle of eccentricity”).
The arrow symbol represents the run-out which is the total
deviation of the gauge as measured from the datum axis. This is
independent of the reference standard chosen and will be
affected by the accuracy of the component centring as well as
the shape or roundness error of the component.
The roundness error at any point on the component can
be selected and displayed by moving the mouse pointer
to a point of interest and clicking the mouse.
Alternatively, you can use the left and right cursor keys
to move the pointer around the trace. The system takes
1024 measurements around the trace and the pointer will
move to the next measurement sample with each
depression of the key.

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Omission of Data
When you have a component with a feature
which is unavoidable to trace but which
should not be included in the roundness
calculation then the data for the feature can
be omitted from the overall trace.
To do this, press the Data Omission icon or select Set Omission Points from the
Options menu.
Then move the mouse pointer to one side of the feature
that you want to remove.
Click the left-hand mouse button once to select a point
and then double click or press Enter to confirm the
selection and a dotted green line will appear to signify
that the selection has been acknowledged. Move the
pointer to the other side of the feature and repeat the
selection process.
The selected region will then appear as a hatched pie
section. If there are more areas to be omitted from the
trace then the selection process should be repeated until
all the areas that are required to be omitted are hatched.
Then press the Redraw button or Close button and the
trace will be redrawn with the selected area(s) removed.
As the trace is redrawn, the roundness results are
recalculated so that the omitted area is ignored in the
calculations.
When data omission points have been set, the view is
automatically changed to draw the trace with the
selected areas removed. If you wish to see the trace in
its entirety then, from within the View menu, select
All Data. Select Omitted Data to see the trace with
omitted areas removed.

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Selecting the Datum
The spindle or centre of the turntable is the Datum for the majority of measurements.
However, some applications require that one section or part of the component is to be
used as the datum or reference point for another nominally concentric section or part.
To carry out this measurement, you must first trace the reference section in the normal
manner. Ensure that you have selected the appropriate level of magnification and filter
and ensure that the appropriate reference standard has been selected from the ‘View’
menu. If there are areas to be omitted then this may be carried out as described
elsewhere. You can save this trace to disc or send to the printer, as you wish. Then,
from within the Options menu, select Set Reference Axis. You will be asked
“Do you wish to use this trace as datum?”If so, click on Yes. The reference
datum is now set for use by a subsequent trace.
Carefully move the stylus to the section of interest. Beware if the mechanics is moved
in any way, the measurement will not be valid. Take the measurement in the normal
manner but avoid making changes to any of the settings. If you find that the pointer
moves off the range, you will need to repeat the datum measurement on a lower
magnification setting, or repeat after re-centring the component.
After completing the trace the results will be
shown, as usual, referenced to the Spindle.
However, a previously greyed out menu
item is now available. If you open the View
menu, you will now be able to select Datum:
Reference Axis. The display will change,
when this item is selected, to show results
referenced to the previously defined
reference axis. A special symbol of a circle
overlaid with a cross indicates the position
of the reference axis in relation to the centre
of the reference standard circle, which is
always positioned at the centre of the chart.
This method requires that the component is perfectly aligned to the axis of measurement
i.e. square to the table. On some components, it is difficult or even impossible to
achieve. In this situation, you can trace two sections of the component and the axis
between the centres of these traces can be set as the reference axis. To do this; measure
the first reference section as previously described and, from the Options menu, select
Set Reference Axis. Then move to the second section and take a trace. Now select
Set Upper Axis from the Options menu. You will be asked to enter a Reference
Height. This is the distance (in mm.) between the first reference section and this
second reference. Now move to the position of interest on the component and take the
measurement trace. As previously described, the result will appear on the screen with
the spindle as reference. Open the View menu and select Datum: Reference Axis. A
new dialog will appear asking you to enter the measurement height. This is the distance
(in mm.) from the first reference axis. If you want to change the value entered at a later
stage, you can use the Options menu and select Enter Measurement Height.

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Changing Magnification or Filter
You may change the magnification and/or the filter AFTER the trace has been taken.
You can use the Options menu and select Change Magnification/Filter Settings or
you can click on the icon.
Be careful not to increase the magnification to such an extent that the trace goes outside
of the chart area or the reference circle will not be valid. You can always return to the
original settings by pressing the Revert button.
Notes:
If the trace went outside of the chart area (into the red area on the setup screen)
when you made the measurement then the results may not be valid. Reducing the
magnification without taking a new measurement will not correct for this error.
You should not change the magnification when using a reference axis as datum.
Printing Results
There are two different formats for printing results. One is a tabular listing of
deviations from the reference circle in degree increments, along with the normal
roundness results. The other is a printout of the roundness chart, similar to that seen on
the display. You can select the format from the File menu by clicking on either
Tabular Printout or Graphical Printout.
If you select Tabular Printout and then
select Print or Print Preview you will be
asked to enter a name (or number) that will
appear on the chart to associate the results
with a particular component. This can be
up to 12 digits. The table will be sent to the
printer or appear on screen as a preview.
You can choose to print from the preview
screen or, after viewing, you can close the
screen and make adjustments before
actually printing. If you are confident that
the printout will be as you wish then you
can print directly without choosing the
preview option.
If you select Graphical Printout and then
select Print or Print Preview you will be
presented with a dialog box which allows a
number of options to be selected.
The Basic Options tab allows the basic appearance to be
modified. Checking the Polar Grid allows the background
grid of the roundness chart to be shown. The Reference
Circle and Peak and Valley Circles allow the user to
choose whether or not to display these extra circles on the
chart. If the Identifications box is not checked then the
Company Heading will be removed from the printout along
with all extra part identifications except for the
Sample Name which appears with the results.

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The Initial Customisation tab allows you to print your
company name on the printout as well as specify
identification headings for the components. Up to eight
different headings can be used. Once this has been set, it is
remembered by the system and need not be changed again.
The Further Print Options allows you to enter the
name of the customer and fill in the component
identifications against the headings that have already
been chosen. You can select to print results for
between 1 and 4 components on each sheet. When you
select more than one component per sheet, you are able
to scale the reference circle for each component. This
scales the trace for each component on the printout and
makes it easier to see individual traces (each trace is in
a different colour but when they are superimposed it is
still difficult to distinguish individual features without
using the scaling option).
If you are using the Preview option, when you press OK the preview will appear on the
screen. If it is not as you wish, you can press Close and go back and change some
selections. If it is correct you should press Print. If you have chosen to show more than
one component on each sheet then the printout will go into a buffer and you will be told
how many more components must be sent to the printer before the sheet is physically
printed. Remember, it is not sufficient to only view the preview on the screen; you
must press the Print button or the results will not be sent to the printer or print buffer.
If you are not using Preview then when you press the OK button the results will be sent
directly to the printer or print buffer.
Saving Results
When you have obtained a trace and selected all
appropriate options and settings, you can save the results
to a disc. You can press the disc icon (third from the left)
or you can choose Save or Save As from the File menu.
Beware if you use the Save option, any previously saved
results with the same name may be overwritten. The disc
icon is set to mimic the Save As function and will
prompt you for a name before saving. When you recall
the results from disc, any reference axis, data omission
area(s) and/or identifications will also be recalled and you
will be able to switch the view to change the display as
you could when the trace was first taken. If you click on
Save Results in Excel format you will be able to select or deselect this option. When
it is selected, the roundness results, i.e. those that appear in the box at the left side of the

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screen, will be copied to a file called ExcelResults.csv. This file is created in the root
of the hard drive, usually C:\.
Date and time are stored along with the results which are added to the file at the same
time as the trace is saved. The file can be imported into Excel and further processed or
printed out, as required. The ExcelResults.csv file should be deleted manually when
its contents are no longer required.
Electro-Magnetic Precautions
Although Logitech Electronics Limited has designed a great deal of noise immunity into
the Logitrace Interface Unit, in accordance with EN5001-2 and EN5002-2 (radiated
emissions, conducted emissions, E.S.D., radiated susceptibility and fast burst transient
testing), it is still vital to use good E.M.C. (Electro-Magnetic Compatibility) techniques
on installation of both this and other associated electronic equipment in order to ensure
reliable operation.
It is important to note that if used near systems that radiate high levels of harmonic
noise such as D.C. Drives, A.C. Inverters and Servo Drives then the levels of imposed
interference can greatly exceed that of the European Standards. In such cases it is
important to ensure that mains leads are routed as far as possible from all cables
carrying power to such equipment and that the supply should, if viable, be taken from a
clean source. Where this is not possible, it is advisable to use a good quality mains
filter mounted as close to the instrument as possible, ensuring that the cable between the
filter and the Interface is kept separate from any cables carrying high levels of current or
any fast switching transients.
Low Voltage Directive
It is essential that the mains supply to the system is fused externally to no more than
13A, and that the cabling supplying power to the Logitrace Interface Unit is rated for
at least 3A. Low voltage signal cables should not be run in the same conduit or twisted
or tied to cables carrying voltages in excess of 50V (a.c. or d.c.).
If the system is not installed fully in accordance with the instructions in this
User's Guide it may not comply with the requirements of the Low Voltage
Directive.

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Copyright Logitech Electronics Limited
2020
Document No: Logitrace_hb-uk.doc v2.0 15 June 2020
Warranty
Logitrace Interface units carry a two year warranty that is only valid where there is no
damage caused by accident, negligence, mis-application, or repairs / modifications
attempted by unauthorised personnel. The warranty only extends to the original user.
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