Renishaw MH20 User manual

MH20 and MH20i user's guide
Documentation part number: H-1000-5195-06-C
MH20 and MH20i user's guide
www.renishaw.com
Issued 07 2019
1

General information
© 2002 ‐ 2019 Renishaw plc. All rights reserved.
This document may not be copied or reproduced in whole or in part, or transferred to any other media or language, by any means, without
the prior written permission of Renishaw.
The publication of material within this document does not imply freedom from the patent rights of Renishaw plc.
Disclaimer
RENISHAW HAS MADE CONSIDERABLE EFFORTS TO ENSURE THE CONTENT OF THIS DOCUMENT IS CORRECT AT THE DATE OF
PUBLICATION BUT MAKES NO WARRANTIES OR REPRESENTATIONS REGARDING THE CONTENT. RENISHAW EXCLUDES LIABILITY,
HOWSOEVER ARISING, FOR ANY INACCURACIES IN THIS DOCUMENT.
Trademarks
RENISHAW® and the probe emblem used in the RENISHAW logo are registered trademarks of Renishaw plc in the UK and other countries.
apply innovation is a trademark of Renishaw plc.
All brand names and product names used in this document are trade names, service marks, trademarks, or registered trademarks of their
respective owners.
All trademarks and trade names are acknowledged.
WEEE
The use of this symbol on Renishaw products and/or accompanying documentation indicates that the product should not be mixed with the
general household waste upon disposal. It is the responsibility of the end user to dispose of this product at a designated collection point for
waste electrical and electronic equipment (WEEE) to enable reuse or recycling. Correct disposal of this product will help save valuable
resources and prevent potential negative effects on the environment. For more information, please contact your local waste disposal service
or Renishaw distributor.
Warranty
Renishaw plc warrants its equipment for a limited period (as set out in our Standard Terms and Conditions of Sale) provided that it is installed
exactly as defined in associated Renishaw documentation.
Prior consent must be obtained from Renishaw if non-Renishaw equipment (e.g. interfaces and/or cabling) is to be used or substituted. Failure
to comply with this will invalidate the Renishaw warranty.
Claims under warranty must be made from authorised service centres only, which may be advised by the supplier or distributor.
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Care of equipment
Renishaw probes and associated systems are precision tools used for obtaining precise measurements and must therefore be treated with
care.
Changes to Renishaw products
Renishaw reserves the right to improve, change or modify its hardware or software without incurring any obligations to make changes to
Renishaw equipment previously sold.
Packaging
To aid end user recycling and disposal the materials used in the different components of the packaging are stated here:
Packaging component Material 94/62/EC code 94/62/EC number
Outer box Non-corrugated fibreboard PAP 21
Packaging insert Corrugated fibreboard PAP 20
Bag Low density Polyethylene LDPE 4
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Product compliance
EU declaration of conformity
Contact Renishaw plc or visit www.renishaw.com/EU for the full EU declaration.
REACH regulation
Information required by Article 33﴾1﴿ of Regulation ﴾EC﴿ No. 1907/2006 ﴾“REACH”﴿ relating to products containing substances of very high
concern (SVHCs) is available at:
www.renishaw.com/REACH
China RoHS
Contact Renishaw plc or visit www.renishaw.com/ChinaRoHS for the full China RoHS tabulation.
MH20 and MH20i user's guide
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Introduction
The MH20 and MH20i are manually operated probe heads that articulate to provide orientation of the probing axis. MH20 provides non-
repeatable orientation, while MH20i permits repeatable indexing at 15° increments marked on the A and B axes. Both heads feature TP20
kinematic (magnetic) probe mounting, allowing stylus module changes without the need for re-qualification. A range of shanks is available to
suit most CMM quills.
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Product description
MH20
The MH20 incorporates the TP20 kinematic mount with 2-axis adjustable swivel. The TP20 module is carried on the A-axis swivel and rotates
through ±93° in the Z‐plane. The B‐axis rotates through ±300° in the X‐Y plane. A thumbwheel locks the swivel in any position within the
movement envelope of the head. After each adjustment qualification must take place. Module changing is possible without re-qualification.
MH20i
The MH20i incorporates the TP20 kinematic mount with 2-axis indexing. The TP20 module is carried on the A-axis swivel and rotates through
90° in the Z‐plane. The B‐axis rotates through ±180° in the X‐Y plane.
The axes are unlocked by releasing the locking lever allowing rotation to each position. Positions are set at angular increments of 15° in each
axis, providing a total of 168 positions.
When head orientation is locked, the probe is fully kinematically constrained in a highly repeatable spatial position.
This means that after initial qualification of the stylus tip, the probe may be moved to any of the qualified positions without the need for re-
qualification during a gauging routine.
MH20 and MH20i
The red LED on the front of the head indicates probe status, and can be controlled by either the CMM or a Renishaw probe interface.
Conventionally LED ON indicates probe seated (armed), and LED OFF indicates probe triggered.
Electrical connection is via a 5-pin DIN connector.
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MH20 specification
Measuring performance
See 'TP20 probe module' for TP20 performance details.
Technical data
Range of articulation A‐axis 93°
B‐axis 300°
Dual axis lock Single rotary thumbwheel
Mounting MS/T range of shanks
Cable connection 5-pin DIN socket
Probe status indication 1 LED
Maximum load EM2 - 94.5 mm (3.72 in) extension module
Operating temperature range +10 °C to +40 °C ﴾+50 °F to +104 °F﴿
Storage temperature range ‐10 °C to +70 °C ﴾+14 °F to +158 °F﴿
Probe mount TP20 kinematic
Weight - without shank 100 g (3.53 oz)
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All dimensions are nominal
* See 'TP20 specifications'.
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Pin no. Function
1LED cathode
2Ground
3LED anode
4Probe circuit
5Probe circuit
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MH20i specification
Measuring performance
Positional repeatability ﴾2σ﴿
At stylus tip with TP20 standard force module and 10 mm (0.39 in)
stylus length
1.5 µm ﴾0.00006 in﴿
At stylus tip with EM2 94.5 mm (3.72 in) extended module and stylus
10 mm (0.39 in) long
2.5 µm ﴾0.0001 in﴿
Technical data
Range of articulation A‐axis: 0° to 90° in 15° increments
B‐axis: ±180° in 15° increments
Dual axis lock Single lock lever
Mounting MS range of shanks
Cable connection 5-pin DIN socket
Probe status indication 1 LED
Maximum load EM2 - 94.5 mm (3.72 in) extended module
Operating temperature range +10 °C to +40 °C ﴾+50 °F to +104 °F﴿
Storage temperature range ‐10 °C to +70 °C ﴾+14 °F to +158 °F﴿
Probe mount TP20 kinematic
Weight - without shank 210 g (7.4 oz)
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All dimensions are nominal
* See 'TP20 specifications'
† From shank mounting face
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Pin no. Function
1LED cathode
2Ground
3LED anode
4Probe circuit
5Probe circuit
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MH20 and MH20i installation
Mounting the shank to the probe head
The MH20 and MH20i shanks are factory fitted and are selected by part no. when ordering (see 'Parts list')
MH20 shanks cannot be removed
MH20i
To mount a shank to an MH20i sold without a shank, please observe the following procedure:
Hold the shank in the recess on the top face of the MH20i
Rotate the shank until four screw holes are aligned
Fix the shank in place using only M3 × 5 mm screws ﴾supplied﴿
Progressively tighten with the 2.5 mm A/F hex key (supplied)
Mounting the MH20 and MH20i head to the CMM
The head is normally attached to the CMM quill using a shank to suit the CMM.
For optimum shielding against EM phenomena it is recommended that the shank is grounded to the same electrical ground as the control
system.
Custom designed mountings are available, subject to approval from Renishaw's Custom Products Department. Please contact your supplier or
Renishaw for further information.
The head mounting must be rigid, as any movement during operation will introduce system measurement errors. If the head is replaced or
repositioned in the quill, all head positions in current use must be re-qualified before making further measurements.
NOTE: Remove plastic cap from kinematic mount prior to attaching a TP20 module. Keep in a safe place for future protection.
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MH20 operation
NOTE: Ensure thumbwheel is unlocked one full turn before re-orientation. Failure to do this will result in excessive wear to the
swivel anodised surfaces. Any wear to the swivel is cosmetic only and does not affect performance.
To change the orientation of the probe:
Unlock the head by turning the thumbwheel anti-clockwise one full turn
Grip the base of the swivel (avoid touching the stylus or stylus module) and manoeuvre the head to the desired position
Lock the head in position by turning the thumbwheel clockwise until tight (do not use excessive force) - the probe is now ready for
qualification
Qualify the stylus tip whenever the head is re-orientated
Qualify the stylus tip(s) according to the CMM supplier's instructions
Periodic re-qualification should be performed according to the following considerations:
CMM supplier's recommendations, particularly in respect of temperature changes
At the start of the working day or shift
After an accidental collision
After changing any measuring system component (except a pre-qualified TP20 module)
If the initial state is unknown or uncertain
Replacement thumbwheel
If the thumbwheel is removed and then lost, a replacement can be ordered by quoting part no. A-4043-0120.
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MH20i operation
NOTE: Ensure locking lever is in fully locked position before taking gauging points.
To change the orientation of the probe:
Unlock the head by turning the lock lever to the fully anti-clockwise position
Grip the body of the probe (avoid touching the stylus or stylus module) and rotate the B-axis until the desired angle indication on the scale
is adjacent to the B‐axis reference mark, increments are in 15°
Rotate the A‐axis until the desired angle indication on the scale is at the A‐axis reference position, increments are in 15°
Lock the head by turning the lock lever to the fully clockwise position
Qualify the stylus tip(s) according to the CMM supplier's instructions
Change the orientation of the probe to the next desired position and qualify the stylus tip(s)
Repeat the qualification process for all desired orientations and stylus tips
Commence gauging, ensuring that the correct qualification data is recalled for each head position
Periodic re-qualification should be performed according to the following considerations:
CMM supplier's recommendations, particularly in respect of temperature changes.
At the start of the working day or shift
After an accidental collision
After changing any measuring system component (except a pre-qualified TP20 module)
If the initial state is unknown or uncertain
Locking lever operation
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TP20 probe module
The Renishaw TP20 probe module incorporates a kinematic coupling, which ensures highly repeatable stylus tip positioning.
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.
* Specified with standard force TP20 module with PS12R stylus and Renishaw PI 4-2 interface
** 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
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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.
1Standard force (SF) probe module Black cap
2Medium force (MF) probe module Grey cap
3Extended force (EF) probe module Brown cap
4Low force (LF) probe module Green cap
5Extended module (EM1) 69.5 mm (2.74 in)
long Black cap
6Extended module (EM2) 94.5 mm (3.72 in)
long Black cap
7TP20 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.
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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)
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TP20 installation
Assembling the probe module and stylus
1. Select the probe module with the correct trigger force rating for the application (see 'TP20 module selector' and 'TP20 specifications').
2. 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
1. Examine all mating faces for cleanliness, where necessary clean the surfaces with the Renishaw CK200 cleaning kit. (supplied).
2. 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.
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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
Z0.65 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
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