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TP20 probe module
The range of modules comprises 5-way versions with length or trigger force options and a 6-way version.
Probe modules fit directly onto the MH20 and MH20i kinematic mount. It is possible to change TP20 modules with different stylus configurations without re-qualification.
TP20 probe specification - standard force module described
| Sense directions - 5-way | ±X, ±Y, +Z |
Unidirectional repeatability * | 0.35 µm (0.000014 in) (2 sigma) |
Module changing repeatability ** | ±1 µm, (0.000039 in) |
XY pre-travel variation * | ±0.8 µm, (0.000031 in) |
Trigger force (non adjustable) *** | XY 0.08 N, 8 gf, 0.29 ozf Z 0.75 N, 76.5 gf, 2.7 ozf |
TP20 module pull-off force | 10 N, 1 kgf, 36 ozf max |
Renishaw styli with M2 thread fit the TP20 probe module.
** This can be achieved by taking care when changing modules (see 'Fitting the probe module with stylus on the MH20 or MH20i')
*** See 'Probing forces and overtravel limits' for LF, SF, MF and EF trigger force values
The probe module
Each probe module houses the touch trigger mechanism that carries the stylus assembly. The module provides overtravel in the X, Y and Z axes. The M2 stylus mounting is compatible with Renishaw's comprehensive range of M2 styli.
Electrical contact pins automatically complete the probe circuit.
Trigger force and length option
Seven versions of the TP20 probe module can be used with the MH20 and MH20i, they can be identified by the end cap colour.
| 1 | Standard force (SF) probe module | Black cap |
| 2 | Medium force (MF) probe module | Grey cap |
| 3 | Extended force (EF) probe module | Brown cap |
| 4 | Low force (LF) probe module | Green cap |
| 5 | Extended module (EM1) 69.5 mm (2.74 in) long | Black cap |
| 6 | Extended module (EM2) 94.5 mm (3.72 in) long | Black cap |
| 7 | TP20 6-way probe module | Blue cap |
Medium and extended force modules are used to overcome the effects of false triggers, caused either by stylus length and mass, or vibration caused by machine acceleration forces.
The low force module permits the measurement of delicate objects.
The EM1 and EM2 extended modules allow access to otherwise inaccessible workpiece features. Both operate using standard force and offer better measuring performance than using long styli with MF, or EF modules.
The TP20 6-way senses in the +Z and -Z directions, allowing undercuts to be checked.
| Module | Stylus length - minimum | Stylus length - maximum | Overall reach |
|---|---|---|---|
Low force (LF) | 10 mm (0.39 in) | 30 mm (1.18 in) | 94 mm (3.70 in) |
Standard force (SF) | 10 mm (0.39 in) | 50 mm (1.96 in) | 114 mm (4.49 in) |
| Medium force (MF) | 10 mm (0.39 in) | 60 mm (2.36 in) | 124 mm (4.88 in) |
Extended force (EF) | 10 mm (0.39 in) | 60 mm (2.36 in) | 124 mm (4.88 in) |
| 6-way (6W) | 10 mm (0.39 in) | 30 mm (1.96 in) | 98 mm (3.86 in) |
| EM1 | 10 mm (0.39 in) | 50 mm (1.96 in) | 143 mm (5.63 in) |
| EM2 | 10 mm (0.39 in) | 50 mm (1.96 in) | 168 mm (6.61 in) |
TP20 installation
Assembling the probe module and stylus
- Select the probe module with the correct trigger force rating for the application (see 'TP20 module selector' and 'TP20 specifications').
- Fit the stylus to the probe module, first hand tightening then using the S7 stylus tool (supplied) for final tightness. Renishaw GF styli require an S20 spanner. The recommended tightening torque is 0.05 Nm to 0.15 Nm (0.04 lb ft to 0.11 lb ft). Torque must not exceed 0.3 Nm (0.22 lb ft).
Fitting the probe module with stylus on the MH20 or MH20i
- Examine all mating faces for cleanliness, where necessary clean the surfaces with the Renishaw CK200 cleaning kit. (supplied).
- The TP20 module and kinematic mount are marked with three unique alignment marks. When offering the TP20 up to the probe head, ensure that similar marks are aligned with each other. Allow the TP20 body to engage under magnetic force.
TP20 specifications
Probing forces and overtravel limits
Trigger force - nominal at stylus tip:
| Probe module stylus length | LF 10 mm | SF 10 mm | MF 25 mm | EF 50 mm | EM1 10 mm | EM2 10 mm | TP20-6 way 10 mm |
| XY | 0.055 N 5.5 gf 0.19 ozf | 0.08 N 8 gf 0.28 ozf | 0.1 N 10 gf 0.35 ozf | 0.1 N 10 gf 0.35 ozf | 0.08 N 8 gf 0.28 ozf | 0.08 N 8 gf 0.28 ozf | 0.14 N 14 gf 0.49 ozf |
| Z | 0.65 N 65 gf 2.29 ozf | 0.75 N 75 gf 2.64 ozf | 1.9 N 190 gf 6.70 ozf | 3.2 N 320 gf 11.29 ozf | 0.75 N 75 gf 2.64 ozf | 0.75 N 75 gf 2.64 ozf | 1.6 N 160 gf 0.56 ozf |
Overtravel force - maximum at stylus tip:
| Probe module stylus length | LF 10 mm | SF 10 mm | MF 25mm | EF 50 mm | EM1 10 mm | EM2 10 mm | TP20-6 way 10 mm |
| XY | 0.09 N 9 gf 0.31 ozf | 0.2 N - 0.3 N 20 gf - 30 gf 0.7 ozf - 1.1 ozf | 0.2 N - 0.4 N 20 gf - 40 gf 0.7 ozf - 1.4 ozf | 0.2 N - 0.5 N 20 gf - 50 gf 0.7 ozf - 1.8 ozf | 0.2 N - 0.3 N 20 gf - 30 gf 0.7 ozf - 1.1 ozf | 0.2 N - 0.3 N 20 gf - 30 gf 0.7 ozf - 1.1 ozf | 0.25 N 25 gf 0.88 ozf |
| (+)Z | 1.15 N 115 gf 4.05 ozf | 3.5 N 350 gf 12.35 ozf | 7 N 700 gf 24.71 ozf | 10 N 1000 gf 35.30 ozf | 3.5 N 350 gf 12.35 ozf | 3.5 N 350 gf 12.35 ozf | 2.5 N 250 gf 8.83 ozf |
-Z | - - - | - - - | - - - | - - - | - - - | - - - | 9 N 900 gf 31.8 ozf |
Overtravel displacement:
| Probe module stylus length | LF 10 mm | SF 10 mm | MF 25 mm | EF 50 mm | EM1 10 mm | EM2 10 mm | TP20-6 way 10 mm |
| XY * | ±14° | ±14° | ±14° | ±14° | ±14° | ±14° | ±14° |
| (+)Z | 3.1 mm (0.12 in) | 4 mm (0.16 in) | 3.7 mm (0.14 in) | 2.4 mm (0.09 in) | 4 mm (0.16 in) | 4 mm (0.16 in) | 4.5 mm (0.18 in) |
| -Z | - - | - - | - - | - - | - - | - - | 1.5 mm (0.06 in) |
* The module may become detached if this value is exceeded.
Length:
| Probe module stylus length | LF 10 mm | SF 10 mm | MF 25 mm | EF 50 mm | EM1 10 mm | EM2 10 mm | TP20-6 way 10 mm |
| Length * | 19.5 mm (0.77 in) | 19.5 mm (0.77 in) | 19.5 mm (0.77 in) | 19.5 mm (0.77 in) | 69.5 mm (2.74 in) | 94.5 mm (3.72 in) | 24.5 mm (0.96 in) |
* See 'MH20 dimensions' and 'MH20i dimensions'
| Module changing | Changed manually probe repeatability is ±1 µm |