Calibrated Digitizing Touch Probe CNC 3D digitizer 1/4" Fixed shank Router

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Calibrated 202033P - 1/4" diameter shank, Touch Trigger Probe TP-100 w/6' shielded cable, no connector. Made in USA.

Uncalibrated - Used for 3D surface digitizing and
WITH calibration
can be used for edge , corner and feature finding and measurement.

This is an assembly of precision machined components. Between the shank and ruby tip, there are over a dozen assembled parts that can affect centrality of the ruby tip.  Even with the most precise tolerances, the possible variation can exceed the general accuracy expected for edge and corner finding on a CNC mill or router .  With calibration, the ruby probe tip is certified concentric to within .0040 inch or less TIR ( TIR = Total Indicated Reading). The tip is adjusted to within .0020 inch of true center.  The calibration is a mechanical process which we have developed.  The calibration tools include precision bearing part holder and dial test indicators with
.0001 inch graduations .

After calibration, a protective tip cover is installed to assure that the probe is delivered with the same accuracy as that set at calibration. The transparent cover is removable and can be easily re-installed to protect the probe when not in use.  See second picture above.

This TP-100 contact probe is a 1/4 inch diameter shank, 5 way ( +X,-X,+Y,-Y,-Z) mechanical contact scanning device with a 2mm ( .0787 in) diameter ruby tip.   It is used with CNC milling and CNC routing style machines to digitize surface and contour data.  When used as a probe the shank is mounted in a spindle collet or chuck or other holder parallel to the spindle axis. Tip stylus extensions are available in 20, 30, 60 , and 90 mm lengths. 1mm, 3mm, and 4mm diameter, ruby tips styli are also available ( see our other Ebay listings for these accessories). 


  • Interchangeable CMM Ruby Tipped Stylus - Ruby is one of the hardest materials known. A ruby tip is unlikely to degrade due to abrasive material scanning. The ruby stylus on this probe has a sphericity ( roundness) of .000050,( 50 millionths) of an inch.  
  • Hardened Tool Steel alloy Shank. Precision mounting with accurate repeatability. Black Oxide treated to prevent rust.
  • Small body design, permits maximum vertical scanning range for small desktop machines ( only 1 inch diameter ( 25.4 mm) x 7/8 inch long( 22.2 mm))
  • This probe will work with CNC controllers that interface to a probing input from a switched contact.  This includes DeskCNC, Mach3, TurboCNC, EMC, linixCNC, Flashcut, cnc Shark, GRBL, and many other PC based programs/controllers.  For other CNC systems, please check with the producer to verify that the system can utilize a contact probe.  Some controller suppliers may require that you license additional software options.  No software is included with this Ebay listing.

    Below are examples to demonstrate the capabilities of the probe, using the DeskCNC controller, other controller and software combinations can achieve similar results.

    scann tiger

    milled tiger

    When used with DeskCNC, a probed surface is filtered, smoothed, reverse compensated for the probe tip radius, and saved as an .STL CAD file.  The 3D surface machining CAM in DeskCNC can make minor edits to the surface and will produce 3D surfacing toolpaths to duplicate the scanned part.  DeskCNC has automated routines to measure and record tool lengths when the probe is used as a tool setter.  The photos above show the 3D scanning of a plastic leopard into an .STL file and a wooden workpiece that was machined from the scan.

    Below is another DeskCNC scanned item.  In this case a 1 mm diameter, ruby probe tip was used to pick up as much detail as possible.The specifics of the scan are: .004 x .004 steps, approx 95,000 points scanned. The total time was about 3.5 hours.  The velocity was kicked up to about 35 ipm on the flat areas. This is the original stl file, rendered in Vector Cad-Cam.  Additional information about the process can be found at this link:   Scanning a Quarter

    scanning a quarter     Scanned quarter

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