WHEN TO CHECK RUN-OUT:
Any time the probe is removed from its holder, the stylus is changed or the probe is used in a different
machine, the alignment procedure should be repeated to ensure accuracy. The user should also repeat
the alignment procedure if the unit is dropped or receives any sudden external shock. It is good practice
to periodically check alignment for quality control and to establish a base line maintenance schedule.
ANGULAR ALIGNMENT:
Angular alignment is the relation of the spindle center line to the stylus stem center line. This
adjustment provides for equal clearance all around the stylus stem. This adjustment is rarely needed
except when extremely small or long stylus is used. When the stylus tip and stem are nearly the same
diameter this adjustment is critical to keep the stem from contacting a vertical surface before the tip.
This adjustment is also convenient to adjust parallelism when flat disc or block stylus types are used.
The range of adjustment is very small as it is only intended to correct the stylus and spindle center line
continuity. If this adjustment must be performed use the run-out adjustment set-up shown above to
monitor the effect of the adjustment. The angular alignment and run-out adjustments are
interdependent. It will be necessary to repeat each several times to achieve significant results. When
completed, the run-out at the stylus mount end of the stylus stem should be nearly the same as the run-
out at the tip. Adjust the stylus tip run-out last.
To check the angular alignment begin by completing the “Dialing-in” procedures for the probe tip.
Measure the run-out at the base of the stylus stem (the end away from the tip) with the dial indicator. If
the run-out is greater than the difference between the tip diameter and stem diameter then it will be
possible for the stem to contact a vertical surface before the tip (also called “shanking out”).
The angular alignment is accomplished by first performing a “Dialing-in” procedure on the stem base
using the run-out adjustment set screws. Next, the tip is dialed-in using the angular adjustment set
screws in the end cap of the probe. These two steps are repeated until the difference in run-out between
the tip and stem base is acceptable. Be sure all set screws are equally tight when finished.
OUTPUT SWITCH LOGIC SELECTION:
The DP-4 output is a solid state switch that can be configured for normally open or closed logic. This
choice can be specified when ordering (recommended) or can be changed in the field. The standard
configuration for the stock DP-4 is normally open. A jumper block located under the mounting shank
inside the probe sets the logic. To access the jumper block unplug the probe, remove the stylus, loosen
the run-out adjustment screws and remove the mounting shank. Be careful not do damage any wires or
allow any dirt or debris inside the probe. Move the jumper from its present position to the opposite end
of the three pin header to invert the logic. Use tweezers or small pliers to slide the jumper block up off
the pins and then slide it down on the pins at the opposite end of the three pin header. Install the
mounting shank and snug the run out adjustment screws. The run out adjustment must be performed
any time the mounting shank is removed.
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