Renishaw High Precision Removable Arm (HPRA)

The HPRA is a ‘plug-in’, cost effective, precision tool setting system for use on CNC lathes. When needed, the arm is manually introduced to the machine envelope and held in place through the use of the
machine resident HPRA base. The arm is locked in position through the duration of the tool setting cycle. After use, the arm is removed and stored on the HPRA storage stand.

Unidirectional repeatability
Max 2 sigma value:

  • 5.0 μm (0.0002 in) for arms
  • supporting 6 in to 15 in chucks
  • 8.0 μm (0.0003 in) for arms
  • supporting 18 in to 24 in chucks

Max arm dimensions: A=580 mm B=450 mm
Min arm dimensions: A=250 mm B=211 mm

HPRA is available to fit most common chuck sizes from 6 in to 24 in.
Each HPRA standard kit (see below) is supplied complete with:
• RP3 probe (A-2197-0049)
• 90° probe holder
• TSi2 interface (A-2176-0010)
• HPRA storage stand (A-2176-0019)

Standard kits
Part number: See below
* A stylus assembly and base (R/E or S/E) rear exit or side exit are not included and must be ordered separately

Part description; Part number; A-dimension; B-dimension
HPRA 6 in chuck with RP3 kit; A-2176-0883; 250; 211
HPRA 8 in chuck with RP3 kit; A-2176-0884; 280; 241
HPRA 10 in chuck with RP3 kit; A-2176-0885; 325; 290
HPRA 12 in chuck with RP3 kit; A-2176-0886; 355; 290
HPRA 15 in chuck with RP3 kit; A-2176-0887; 455; 335
HPRA 18 in chuck with RP3 kit; A-2176-0888; 510; 375
HPRA 24 in chuck with RP3 kit; A-2176-0889; 580; 450.

Custom kits
The HPRA can also be designed for specific applications. The customer must specify arm length, probe holder, stylus configuration etc. The items below depict some of the options.
1 A-2176-0268 PCB/LED housing
2 A-2176-0018 90° holder fixed
3 A-2176-0257 I/L holder fixed
4 A-2048-0523 LP2 adaptor
5 A-2176-1291 I/L adj RP3 holder
6 A-2176-1290 30° adj RP3 holder
7 A-2176-0269 45° adj RP3 holder
8 A-2176-1289 60° adj RP3 holder
9 A-2176-1288 90° adj RP3 holder