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TCR20 is a compact probe module rack for use with PH20 that provides the capability for quick and repeatable tool changing and tip correction.

Based on the industry standard range of MCR20 rack systems, TCR20 securely stores modules for rapid automatic changing, protecting mating surfaces from any airborne contaminants within the working envelope of the machine.

TCR20 carries the full range of TP20 modules for use with a PH20 system and can accommodate a range of module and stylus combinations.

TCR20 features an integrated tip datum artefact in the centre of the rack assembly, reducing cycle time when measuring and performing the tip correct procedure.

Tip correction is key when the absolute highest level of accuracy is required for certain applications. It compensates for any residual variations after a tool change, maintaining a market leading level of accuracy from PH20.

TCR20 alignment and change routine

The following routines are handled through UCCserver for TCR20:

  • Alignment routine
  • Put down and pick up routine
  • Safe position

Mounting TCR20 onto the CMM

NOTE: To minimise the machine volume lost it is recommended that the TCR20 is mounted as close as possible to the extreme edge of the CMM's operating envelope.

1. Fix the rack base to the CMM bed using the appropriate fixing screw. Depending upon the size of screw required it may be necessary to also use a washer.

Fixing TCR20 base to CMM

2. Fit the TCR20 leg into the base and orientate the rack. Secure the rack in the correct orientation by tightening the three grubscrews that are located in the rack base.

Securing TCR20 leg to base

Technical data - TCR20


200 mm (7.87 in)


57 mm (2.24 in)

Base diameter

50 mm (1.97 in)

Port entry velocity

Maximum 800 mm/s

Mounting orientation

Ports in horizontal position only

Tip correct artefact

Centre of rack assembly


None - overtravel in PH20 head

Inhibit range

None - provided by UCC controller