Preparing To Trace - Logitech Logitrace User Manual

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.
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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Logitrace_hb-uk.doc v2.0
If necessary, improve the
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