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HP arms and RP3 tool setting probe

For tool measuring and broken tool detection on 2-axis and 3-axis CNC lathes.

High-precision tool setting arms for lathes and grinding machines.

RP3 is also suitable for OEM installation into purpose-built holders.


High-precision removable arm

A 'plug-in' arm which is manually placed in the machine when tool setting is performed, and removed once the process is completed.


High-precision motorised arm

An electrically powered arm. Rapid actuation allows in‑process tool setting and broken tool detection without the need for operator intervention.


High-precision pull-down arm

The HPPA uses an innovative rotary device which automatically locks the arm into a repeatable kinematic location, with no additional adjustment or locking device required.


High-precision generic arm

A highly repeatable motorised solution for tool setting and workpiece inspection with improved robustness and adaptability on grinding machines and CNC lathes.

HP arm system kits for lathes (HPRA, HPPA, HPMA)

HP arm kits comprise:

  • Tool setting arm
  • RP3 probe
  • Rear exit base and stand
  • TSI 2 or TSI 3 interface
  • User's guide

HP arm system kits for grinding machines and lathes (HPGA)

HP arm kits comprise:

  • Tool setting arm
  • MP250 or LP2 probe
  • Side exit hub and base
  • HSI and TSI 3 interface
  • User's guide

HP arms in action

RP3 tool setting probe

Tool setting kinematic probe for lathes and turning centres that can also be used for workpiece set-up. Suitable for OEM installation into purpose-built holders. It utilises a universal M4 stylus mounting, allowing the full range of Renishaw styli to be used. Connection from the probe terminals to the interface cable is made easy with the availability of an OEM kit. The short body provides significant advantages in tool setting applications and the high performance of traditional Renishaw touch-trigger probes.

RP3 features and benefits

  • Compatible with the full range of Renishaw M4 styli.
  • Standard fit HP series tool setting arm (HPRA, HPPA and HPMA).
  • Flexibility – kit available for OEM installations.
  • Large 9° of overtravel – increases the durability of the probe.
  • 1.00 μm 2σ repeatability.

Relevant videos

RP3 and HP arms

Supporting information


Compatible interfaces / transmission units – TSI 2, TSI 2-C, TSI 3, TSI 3-C.

HP arms literature

For Installation guides, User guides and Product compliance certificates, please visit our Technical support library.