7. COLLIMATION ELBO CONTROLLI srl
Preset E236+
23
The focusing control bars supply information about image sharpness in the measurement points that are
specified in the figure; therefore, it’s possible to obtain different pieces of information (in the maximum
value) for different tools or also for different cutting edges in the same tool. For example, this depends on
the ware level or the relief angle.
However, in order to carry out correct measurements, it is necessary to reach the highest possible value,
which is highlighted by the peak indicator to be found with each bar.
There is no need, however, to forget that the measurement point is the one relating to the tool maximum
tangency and that focusing is only used to make the search easier; indeed, the
maximum tangency will
always be found in the maximum focusing value
. But this means that
the maximum focusing value
contains a residual measurement inaccuracy,
which is determined by the radius of the measured tool.
The following figure shows the relation between the focusing value (indicating the distance of the tool from
the lens) and the maximum tangency of the tool (indicating the angular position of the tool compared to the
spindle rotation axis).
Light beam
Cutting edge
