Centroid DP-7 User manual

DP-7 Touch Probe
Operator's Manual
U.S Patent #6553682
Rev 2013-11-11
Copyr ght © 2003-2013 Centro d Corporat on
Howard, PA 16841

DP-7 Quick Start Guide
1. Install MPU11 Probe cable assembly #11085 if necessary. Refer to Common Cables
picture on page 12 connection diagram on page 13 and appropriate appendix for
parameter settings and upgrade information.
2. Connect coil cord to DP-7 and to bulkhead connector on probe cable assembly
#11085. See probe features and general description page 1. LED indicating light will
alternate colors during power up and initialization and the probe outputs are exercised
also as a diagnostic tool at this time
3. Set system control parameters. See “Table of Contents” to locate application specific
appendix for a list of parameter settings and upgrade information.
4. Confirm machine is responding to DP-7 input by running an automatic cycle without the
probe in the spindle and manually touching the DP-7 stylus mount boss. Refer to
control operator's manual for automatic probing cycles. Follow the “Initial Control/Probe
Setup Procedures” in the appendix appropriate for your control.
5. Install the DP-7 and tool holder in the spindle then install the stylus in the DP-7. See
Stylus handling and installation procedures on page 4 and perform run-out adjustment
as shown on page 5.
6. Review stylus travel limits on page 3 and perform an automatic probing cycle at
reduced speed.
7. Calibrate stylus tip size. See procedures on page 9.
8. Review Adjustments page 3 4 and 5 and Maintenance and Care page 9 to keep DP-7
in good operational condition.
9. Probe is now ready to use.

TABLE OF CONTENTS
General Description Page 1
Over Travel Limits and Dimensions Page 2
Specifications Page 3
Stylus Assembly Installation and Alignment Procedures Page 4
Run-out Adjustment “Dialing-in” Page 5
When to check run-out Page 7
Angular Alignment Page 7
Angular Alignment Adjustment Procedure Page 8
Initial Control / Probe set up procedure Page 9
Stylus Tip Diameter Calibration Page 9
Maintenance and Care Page 10
Shipping Instructions Page 11
Kit Contents Page 12
Common Cables Page 13
Connection Diagram (universal) Page 14
Grid Digitizing Tips Page 15
Cutting a Copy of Digitized Part Tips Page 16
Appendix A – CNC10 Centroid Control System Application Page 17
Upgrading from DP-4 and DP-4D
Appendix B – CNC11 Centroid Control System Application Page 21

DP-7 PROBE GENERAL DESCRIPTION AND SPECIFICATIONS
GENERAL DESCRIPTION:
The DP-7 was designed for applications that require minimal pre-travel variation (PTV) such
as digitizing, measuring and pro ing in varying directions. The DP-7 can maintain minimal
pre-travel variation while using stylus assem lies much longer than other pro es. The DP-7
features pre-travel correction technology making it the o vious choice for demanding high
accuracy applications.
The user should first ecome familiar with the various parts and features of the pro e as
shown a ove to facilitate assem ly, installation, cali ration and maintenance. Read the stylus
installation and alignment procedures section efore attempting assem ly. Review the over-
travel limits shown in the specifications. Exceeding the limits will damage the pro e and stylus
assem ly.
The DP-7 is factory tested and adjusted using the stylus components it is shipped with.
Specify the required stylus assem ly when ordering to minimize the num er of adjustments
necessary during set up. Off the shelf stylus components rarely align properly when first
assem led.
A high quality 5 pin connector through the pro e ody provides a convenient disconnect point
for the stock 6 foot retractile cord. A short retractile cord is also availa le.
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Mounting shank
Run-out adjustment screws
Use 3/32” hex wrench
LED indicator light
ngular alignment screws
Rubber seal
Stylus mount boss
Stylus tightening hole
DP-7 RE R VIEW
Electrical
connector
Body
Stylus stem
Stylus tip
DP-7 FRONT VIEW
Stylus stem base

The DP-7 works with the Centroid control to minimize pre-travel variation. CNC11 systems
are plug-in ready for the DP-7. CNC10 systems require an additional installation kit. See the
Centroid appendix for CNC10 installation kit information.
DP-7 SPECIFICATIONS:
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OVER TR VEL LIMITS ND DIMENSIONS
10°10°
0.15”
3.8mm
0.5” ø
12.7mm
1.3” ø
33mm
1.5”
38mm
2.64”
67mm

DP-7 SPECIFICATIONS:
Pro ing directions X+/-, Y+/-, Z-
Unidirectional repeata ility (2 sigma) 0.00004” (1 micron)
Pro e deflection force (X,Y) 5 ounce nominal with 40mm stylus
Pre-travel variation X,Y,Z <0.0009” with 140 mm stylus
Pro e deflection force (Z) 35 ounce nominal
Pro e ody diameter and length D= 1.30” (33.1mm) L= 2.64” (67.2mm)
Mounting shank diameter and length D= 0.50” (12.7mm) L= 1.50” (38.2mm)
Stylus mount thread M3
Output signals Sinking (FET open drain) up to 30V 50mA
Output logic normally open
Power supply required 10 – 30 VDC 50mA
LED status indicator green = ready, red = tripped, flashing = travel warning
Weight of pro e and ½”shank 0.55 l
Over travel limit angle (X,Y) +/- 10 degrees from vertical
Over travel limit (Z-) 0.150” (4.3mm)
Environmental IP54, Dust Proof
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STYLUS ASSEMBLY INSTALLATION AND ALIGNMENT PROCEEDURES
Important: Read the complete procedure efore starting.
The DP-7 is factory adjusted for the stylus and stylus extension that are supplied with it.
Using other stylus components will pro a ly require some adjustment. When assem ling
stylus extensions do not twist or apply torque to the car on fi er or ceramic composite
section. Use the supplied 0.035” hex wrenches to tighten the stylus assem ly as explained
elow.
Req ired Tools:
3/16” open end wrench
0.035” hex wrench (two of these)
0.001" or etter Dial Indicator with Magnetic Base
0.500" Dedicated Tool Holder
STEP 1: Thread the 0.25” ru y tip stylus into the car on fi er stylus extension. Use the
supplied 035” hex wrenches to tighten the stylus assem ly, insert a wrench through the hole
nearest to the joint to e tightened. See photos elow. Never apply torque to the car on fi er
section of the stylus extension assem ly. Apply force with thum and finger to the hex
wrench ends to tighten the threads. Do not end the hex wrenches. If the hex wrenches are
ending too much force is eing applied. Be careful not to drop or end the stylus assem ly.
It is very rigid and will e damaged y mechanical shock and stress.
STEP 2: Install the DP-7 Pro e into a dedicated 0.500" tool holder and into the machine
spindle.
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STEP 3: Thread the stylus assem ly into the stylus mount oss on the DP-7. Insert a
wrench into the hole located closest to stylus mount oss. Place the 3/16" wrench, on the
flats of the stylus mount oss. Refer to the pictures elow.
Use thum and finger to apply torque to the hex wrench. Do not apply any twisting force with
the 3/16" open end wrench; use the wrench to counter act the twisting force eing applied y
the hex wrench in the hole. Excessive twisting force applied to the pro e through the stylus
mount oss could damage the internal sensor assem ly! If the 035” hex wrench egins to
end too much force is eing applied.
RUN-OUT ADJUSTMENT:
The run-out adjustment procedure, is necessary to ensure that the center of the pro e stylus
tip is aligned with the center of the spindle rotation axis. This eliminates any unexpected off-
set when digitizing or doing automated part set-up.
STEP 1: Position the dial indicator, as shown in the photo elow, with the finger of the dial
indicator on the front and center of the stylus all.
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Run-out Adjustment set-up and effect of Set Screw Movement
STEP 2: Rotate the spindle y hand (without touching the pro e) so that the pro e spins
through a full 360 degrees and watch the dial indicator to locate the high and low run-out
rotation positions of the stylus. Adjust the dial indicator so that the entire run-out of the tip can
e seen on the dial. If the run-out exceeds the range of the dial then egin at the highest point
of the run-out and set the dial indicator so it is at the limit of its range at this point.
STEP 3: Rotate the pro e to locate the max run-out location. Rotate the pro e so that
the nearest run-out adjustment set screw is a ove the finger tip of the indicator. Only adjust a
set screw when it is directly a ove the indicator finger. This way you can see the full effect of
the adjustment you are making. Using the 3/32" hex wrench slowly turn the setscrew directly
a ove the indicator finger, in the counter clock-wise direction, the dial indicator will show the
reduction in the run-out. Do not allow the pro e to ecome loose on the mounting shank.
Rotate the pro e to the set screw that was nearest the low run-out and position the set screw
directly a ove the finger of the dial indicator. Insert the 3/32” hex wrench in the run-out
adjustment set screw and tighten. Watch the dial indicator to see the effect of the adjustment.
STEP 4: Repeat step 3 as many times as necessary, minimizing force and deflection of
the dial indicator each time. Adjust until no run-out of the tip is visi le on the dial indicator
needle. If the screws ecome too tight efore you have finished the adjustment, do not force
them, instead loosen the setscrew that corresponds with the highest reading on the dial
indicator and tighten the set screw at the lowest reading. Only adjust a set screw when it is
directly a ove the indicator finger. This way you can see the full effect of the adjustment you
are making. When all three set screws are equally tight and no run-out is visi le on the dial
indicator needle the adjustment is complete.
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WHEN TO CHECK RUN-OUT:
Any time the pro e is removed from its holder, the stylus is changed or the pro e is used in a
different machine, the alignment procedure should e repeated to ensure accuracy. The user
should also repeat the alignment procedure if the unit receives any sudden external shock. It
is good practice to periodically check alignment for quality control and to esta lish a ase 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 an extremely small tip 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 efore the tip. This adjustment is also convenient to adjust parallelism when
flat disc or lock stylus types are used. The range of adjustment is very small as it is only
intended to correct the stylus and spindle center line alignment. If this adjustment must e
performed use the run-out adjustment set-up shown a ove to monitor the effect of the
adjustment. The angular alignment and run-out adjustments are interdependent. It will e
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 e nearly the same as the run-out at
the tip. Adjust the stylus tip run-out last.
WHEN TO CHECK ANGULAR ALIGNMENT:
The DP-7 when shipped with a long stylus assem ly is aligned for that assem ly at the
factory. When replacing stylus assem lies with off the shelf parts it is likely adjustment will e
needed. Check the angular alignment any time stylus parts have een first assem led,
changed or adjusted.
CHECKING ANGULAR ALIGNMENT:
To check the angular alignment egin y checking run-out at the pro e tip. Adjust the tip run-
out to zero. Measure the run-out at the ase of the stylus stem (the end at the stylus mount
oss) with the dial indicator. If the run-out is greater than the difference etween the cali rated
tip diameter and stem diameter then it will e possi le for the stem to contact a vertical
surface efore the tip (also called “shanking out”). Adjustment is necessary if it is possi le for
the stylus to shank out.
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