Page 1: Table Of Contents
KP-3 CNC Touch Probe Centroid KP-3 CNC Touch Probe CNC Software version: CNC12 V.4.5+ Models: Acorn CNC Specifications Components Connections to Acorn Acorn KP-3 Wizard Setup Stylus Installation Testing Probe Alignment Styli Diameter Pre-travel Calculation Oak and Allin1DC setup Use with other CNC controls centroid_kp-3_cnc_touch_probe.pdf rev 11 11-18-20...
Page 2: Specifications
KP-3 Description The KP-3 is a CNC Touch Probe intended for probing to find part zero’s, reference positions, locate bores, bases, corners etc., and digitizing which allows for the copying of surfaces and shaped objects. The user should first become familiar with the various parts and features of the probe as shown below to facilitate assembly, installation, operation and calibra- tion.
Page 3: Components
KP-3 Acorn Kit Components KP-3 Acorn kit part# 14947 KP-3 Acorn kit part# 14947 - KP-3 probe - 2.5 mm x 40mm carbide stem, ruby tipped stylus - Stylus wrench - KP-3 to Acorn hookup cable - KP-3 to Acorn schematic download Mounting: The standard 1/2”...
Page 4 KP-3 Identification Mounting Shank Concentricity adjustment screws. 3/32” hex RED LED indicator light Off = ready ON = Probe Tripped Serial Number End Cap Stylus mount boss 2.5 mm carbide stem ruby tipped stylus Concentricity adjustment screws. 3/32” hex Electrical connector Manufacturing Bar Code Probe Body Stylus tighten hole...
Page 5: Connections To Acorn
KP-3 Wiring to Acorn Title: PROBE SIGNAL ACORN_rev4, KP-3 PROBE PROBE DETECT Ver: Date: 200507 Drawn by: Filename: S15020.DWG Sheet How to tell the difference between Acorn_rev2, Acorn_rev3 and Acorn_rev4 Acorn_rev2 has FIXED green screw terminal blocks Acorn_rev3 has REMOVABLE green screw terminal blocks Acorn_rev4 has LED indicators for the Inputs and Outputs CABLE PN:14947 INCLUDED WITH KP-3...
Page 6 KP-3 Probe cable connector Connect the 1/8” mini jack connector into the KP-3 body and fully seat the plug! Correct! probe cable connector is fully seated. Incorrect, probe cable connector is not fully seated. Page 6...
Page 7: Acorn Kp-3 Wizard Setup
KP-3 Acorn Wizard configuration 1.) Select the Probe input type from the drop down box 2.) click and drag “ProbeDetect” and “ProbeTripped” to inputs 6 and 7 respectively Page 7...
Page 8 KP-3 Acorn Wizard configuration 1.) Select the Probe menu under “Touch Devices” 2.) Choose “KP-3” in the Probe Type Drop down menu. 3.) Press Write Settings to CNC control and follow the instructions on the screen. Page 8...
Page 9: Stylus Installation
KP-3 Stylus installation See the KP-3 Unboxing video for a demonstration on how to install the stylus in the KP-3 https://youtu.be/HbOMSKYuy6g Step 1: Inspect the threads and mating surfaces of the stylus and stylus mount boss. They must be clean and free of defects.
Page 10 KP-3 Stylus installation STEP 3: Finish tightening the stylus by inserting the stylus wrench in the stylus wrench hole and slowly tighten. Snug the stylus until the probe begins to deflect and when you feel a mild but firm stop has been reached stop applying torque, the stylus is now completely tight.
Page 11: Testing
Testing the KP-3 “Bench test” the KP-3, you can have the probe on the bench or in the spindle whatever is safest. 1.) Enter into the CNC12 Probing Cycle menu, F1 Setup, F1 Part, F5 Probe, pick F1 Bore probing cycle. 2.) With the KP-3 plugged in (make sure Plug is FULLY seated!), manually trigger the probe by gently touching the stylus to trigger the probe observe the Probe state indicator graphic on the screen.
Page 12 Test before every use! Even after the initial setup and operational verification it is always good practice to get in the habit of manually checking the probe to confirm that it is functioning every time BEFORE running a probing cycle to prevent a Probe crash. This quick test is easy and will save you heart ache by verifying that the probe is plugged in and functioning before running an automatic probing cycle.
Page 13: Probe Alignment
Touch Probe Alignment Now that you know the probe works and is triggering properly along with a probing cycle we need to make sure the probe stylus tip is concentric with the spindle and then the probe will be ready to use! Probe Alignment: Center the Ball of the stylus so that it is concentric with the spindle Using an indicator and the three run out adjustment screws on the body of the probe we will adjust the concentricity of stylus ball to be concentric with the spindle.
Page 14 Touch Probe Concentricity Probe “run-out” is the amount the probe tip moves an indicator as the spindle is rotated. Run-out adjustment is necessary to ensure that the center of the probe tip is aligned with the center of the spindle rotation axis. This eliminates any unde- sired off-sets between the probe and the cutting tool centers when digitizing or doing automated part set-up.
Page 15 Touch Probe Concentricity alignment STEP 1: Install the KP-3 Probe into the dedicated 0.500” tool holder in the machine spindle. STEP 2: Position the dial indicator, as shown in the photo below, with the finger of the dial indicator on the front and center of the stylus ball.
Page 16 STEP 4: Rotate the probe so that the nearest run-out adjustment set screw is above the finger tip of the indicator. Using the 3/32” hex wrench slowly turn the setscrew directly above the indicator finger, in the counter clock-wise direction, the dial indicator will show the reduction in the run-out.
Page 17 STEP 5: Repeat steps 4 until no run-out of the tip is visible on the dial indicator needle. If a set screws become too tight before 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.
Page 18: Styli Diameter Pre-Travel Calculation
Touch Probe “Pre-Travel” stylus diameter calibration procedure. Calibrate the probe stylus diameter for the tool library. Just entering the value of the probe tip diameter in the tool library will not produce accurate results unless they are corrected for stylus pre-travel. Pre-travel is the amount of deflection of the stylus tip before the probe detects the surface.
Page 19 A message box will appear on the screen that will display the measured diameter of the bore. Subtract this number from the known diameter of the gauge bore. The resulting number will be the calibrated diameter of the probe stylus tip with the pre travel taken into consideration. For example with a 1”...
Page 20 You can tweak the probe stylus pretravel calibration diameter and repeat as needed to obtain as close a measurement as possible to the actual ring gauge diameter. Assuming the machine has low backlash and the probe is accurate, it is possible to obtained +/- .0002”...
Page 21 Special Cases There are three screws on the bottom of the KP-3, these are the angular adjustment screws, these are set at the factory and in general do not need to be adjusted. Cap mounting screws, do no loosen Factory Set Angular Alignment jack screws Factory Set Angular Alignment:...
Page 22: Oak And Allin1Dc Setup
KP-3 Internal Bulkhead cable wiring for Oak and Allin1DC KP-3 Kit for Oak Allin1DC #14944 Allin1DC and Oak Internal "Bulkhead" Probe cable Cable goes from Allin1DC/Oak onboard Probe connector to a round bulkhead connector WIRE FUNCTIONS COLOR SIGNAL +12V SUPPLY FUSED BLK/RED INPUT 772 TT DETECT INPUT 771 PROBE DETECT...
Page 23 KP-3 Probe Cable for use with Oak or Allin1DC 5 FT MTP3CBL PCB Sub. Assy. 14927 RING GROUND / SHIELD Install in strain relief shell BUSS to pin 5 YEL to pin 2 SHIELD BUSS to pin 3 3.5mm STEREO AUDIO BARREL PLUG RED to pin 6 W/CORD PN 7040...
Page 24 CNC12 KP-3 configuration for Oak and Allin1DC CNC12 V4.16+ requires a Pro or Ultimate License for Probe functionality. Oak/Allin1DC control system parameters below are the recommended basic settings SAE Inch and Millimeters in (mm) These are the suggested starting values. Some of these parameters are typically adjusted by the integrator/user to suit the probing/digitizing application.
Page 25: Use With Other Cnc Controls
KP-3 wiring and use with other CNC controls The KP-3 is compatible with most any CNC control with an input for a probe. The KP-3 itself is a kinematic probe which simply breaks continuity through the precision kinematic seat ( a super accu- rate switch) when tripped.
Page 26 A “Normally Closed” Probe DETECTION Circuit CLOSES the Input when Probe is plugged in. Centroid KP-3 has a simple Probe Detection Circuit built into the probe which when the probe is plugged in by the opera- tor lets CNC12 know that a probe is active and in use. This detection input tells CNC12 to start activate Probe Protection.
Page 27 Related Resources KP-3 Unboxing Video https://youtu.be/HbOMSKYuy6g KP-3 Setup Video. https://youtu.be/a6LVseKI7do Acorn Probe and TT setup Manual https://www.centroidcnc.com/centroid_diy/downloads/acorn_documentation/acorn_probe_setup.pdf Free Tech Support sign up. Free Tech Support sign up. All Acorn Documentation is here Page 27...