apply innovation
Renishaw
scanning
technology
Renishaw’s innovative approach
to scanning system design
compared with conventional
solutions
Issue 2
Slide 1
technology
apply innovation
Questions to ask your metrology system supplier
• Do my measurement applications require a scanning
solution?
– how many need to be scanned?
– how many need discrete point measurement?
• If I need to scan, what is the performance of the
system?
– scanning accuracy at high speeds
– total measurement cycle time, including stylus changes
Slide 2
• If I also need to measure discrete points, how fast can
I do this?
apply innovation
Questions to ask your metrology system supplier
• Will I benefit from the flexibility of an articulating head
– access to the component
– sensor and stylus changing
• What are the lifetime costs?
– purchase price
– what are the likely failure modes and what protection is
provided?
– repair / replacement costs and speed of service
Slide 3
apply innovation
Probing applications - factors
Manufacturers need a range of
measurement solutions.
Why?

machining processes have different
levels of stability:
 stable form :
 therefore control size and position
 discrete point measurement
 form variation significant :
 therefore form must be measured and
controlled
 scanning
Slide 4
apply innovation
Probing applications - factors
Manufacturers need a range of
measurement solutions.
Why?

Features have different functions:
 for clearance or location
form is not important
 Discrete point measurement
 for functional fits
form is critical and must be controlled
 Scanning
Measured values
Best fit circle
Slide 5
Maximum inscribed
(functional fit) circle
apply innovation
Scanning
Typical scanning routines to measure form
Slide 6
Scanning provides much more
information about the form of a
feature than discrete point
measurement
Spiral scanning of a cylinder
bore gathers data about feature
size, position, orientation and
form
apply innovation
Renishaw scanning - our objectives
• speed and accuracy
– design sensors with high dynamic response to
provide high accuracy data at high speed
– accurate through use of sophisticated probe
calibration
– match styli materials to applications for best results
• flexibility
– probe changing
– stylus changing
– articulation
• cost effectiveness
Slide 7
– innovative hardware and scanning techniques
reduce complexity
– robust designs and responsive service for lower
lifetime costs
apply innovation
Renishaw scanning systems
Active and passive
scanning probe design
Renishaw scanning sensor
design
Performance styli for
scanning
Articulating heads
Slide 8
Probe and stylus changing
apply innovation
Active or passive sensors?
Passive sensors
Simplicity
• no motor
drives
• no locking
mechanism
• no tare system
• no
electromagnets
Active sensors
Complexity
• 3 force generators
• 3 dampers
• LVDTs mounted on
stacked axes
• no electronic
damping
• Design
Slide 9
– active sensors are large, heavy and complex
– passive sensors are small and relatively simple
apply innovation
Passive sensors
Simple, compact mechanism
– no motor drives
– no locking mechanism
– no tare system
– no electromagnets
– no electronic damping
• springs generate contact force
– force varies with deflection
Force
Typical scanning
deflection
Slide 10
Deflection
apply innovation
Active sensors
Complex, larger mechanism
• force generators in each
axis
• force is modulated in probe
– not constant at stylus tip*
Displacement
sensor
• deflection varies as
necessary
Axis drive
force
generator
– longer axis travels
Force
Controlled
force range
Slide 11
* see next slide
Deflection
apply innovation
Active sensors
Errors in force modulation at stylus tip
Force Fp
controlled here
• force is modulated at each stacked axis
• mechanism & stylus mass, plus stylus
stiffness connect force generator to stylus tip
• errors that lead to uncontrolled stylus force:
– inertial acceleration of stylus mass
– error in estimating probe acceleration (d2xp/dt2)
– error in estimating probe velocity (dxp/dt)
– error in estimating quill acceleration (d2xq/dt2)
– force feedback error (eFp)
What
matters is
force Fs here
cp Fp
Slide 12
Quill
x
q
kp
Probe
mechanism
mass
xp
ks
Stylus
mass
xs
Fs
apply innovation
Method of control
Passive sensors
• simple device
senses deflection
• no powered
motion
• measurements
taken using
machine to control
stylus deflection
• 3 axes under
servo control
Slide 13
– new devices take
advantage of
modern CMM
motion control
Active sensors
Compact
passive
sensor
Complex
active
sensor
• effectively a
miniature CMM
• ‘force generators’
control the
deflection to
modulate the force
on the stylus
• 6 axes under
servo control
– conceived in
1970s to
accommodate
poor machine
motion control
apply innovation
Sensor design and calibration
Passive sensors
Active sensors
• smaller axis
travels required
– at 300 mm/sec,
deflections can
be held within
a 100 µm
range*
Compact
passive
sensor
• stylus bending
compensated
by sophisticated
calibration
routine
Slide 14
* using adaptive scanning
Complex
active
sensor
• large probe
travel needed to
keep the contact
force steady
during scanning
• directiondependent
stylus bending
variations
minimised by
controlling the
contact force
apply innovation
Dynamic response
Passive sensors
Active sensors
• light weight
• motorised stylus carrier
– high natural frequency
suspension system
Slide 15
Probe suspension
responds whilst
scan vector is
adjusted
– driven on internal servo
loop
Motors adjust
stylus position to
modulate contact
force
apply innovation
Scanning probe calibration
Constant force does not equal
constant stylus deflection
• although active sensors provide
modulated probe force, stylus
bending varies, depending on
the contact vector
F

F
• stylus stiffness is very different
in Z direction (compression) to
in the XY plane (bending)
• if you are scanning in 3
dimensions (not just in the
plane of the stylus), this is
important
Slide 16
High deflection
when bending
Deflection
Low deflection
in compression
– e.g. valve seats
– e.g. gears
0
90
180

apply innovation
Scanning probe calibration
 modulated force does not result in better accuracy
– passive & active sensors must both cope with non-linear stylus
bending
– how the probe is calibrated is important
Slide 17
Passive sensors
Active sensors
• passive probes have contact
forces that are predictable at
each {x,y,z} position
• contact force is controlled,
and therefore not related to
{x,y,z} position
• scanning probe axis
deflections are driven by the
contact vector
• calibration must linearise
output of readheads,
mechanism motion and
stylus bending
• sensor mechanism and
stylus bending calibrated
together
• longer styli increase
bending variation
apply innovation
Effective calibration for superior 3D scanning
SP80 testing at Renishaw
• sub micron 2D and 3D scanning
performance
– 2D:
– 3D:
0.3 m
1.0 m
• ISO 10360-4
• unknown path
• raw data - no data filtering
Slide 18
Test details:
CMM spec
Test time
Controller
Filter
Stylus length
0.5 + L/1000
97 secs
UCC1
None
50 mm
apply innovation
Measurement performance
Passive sensors
Active sensors
• low inertia probe holds
surface at high speeds
• motorised probe
mechanism enables high
speed scanning
• fast discrete point
measurement cycles with
'extrapolate to zero'
routines
• no heat sources for
improved stability
– 500 mW power
consumption
Slide 19
– < 1ºC temperature change
inside probe
• slow discrete point
measurement cycles due to
the need to servo and static
average probe data
• heat sources: motors and
control circuits generate
heat that must be measured
and compensated
apply innovation
Minimum inspection cycle times
High speed measurement
High speed scanning on a
large component
Slide 20
Scanning a complex surface at
high speed
apply innovation
Minimum inspection cycle times
High speed measurement
Video commentary
• scanning probe
taking discrete
points at high speed
• ‘extrapolate to zero’
routines
• high speed scanning
Slide 21
Rapid discrete point measurement and
scanning combined
apply innovation
Robustness
Passive sensors
Active sensors
• simplicity
• more things to go wrong
– position feedback system is
only electro-mechanical
element
– force generators
– no moving wires
– electromagnets
• kinematic stylus changing
and patented Z over-travel
bump stop provide robust
crash protection
– probe will survive most
accidents
Slide 22
• simpler motion control
– locking mechanism
– tare system
– electronic damping
– control hardware for the
above
• limited crash protection if
the stylus is deflected
beyond its limits
• more complex motion control
apply innovation
Robustness
Crash protection
Video commentary
• overtravel in XY plane
• causes stylus module to
unseat
• stop signal generated
• stylus reseats as
machine backs off
surface
• probe still operational
Slide 23
Detachable styli allow stylus overtravel
without damage to the probe or
component
apply innovation
Lifetime costs
Passive sensors
Active sensors
• lower purchase costs
• higher purchase costs
– simple and cost-effective to
purchase
• lower running costs
– crash protection for greater
reliability
– 50,000+ hours operating life
– advance replacement
service at discounted price
Slide 24
– customer-replacement on
site due to simple fittings
– less downtime
– cost-effective repair
– complex and high cost
sensor
• higher running costs
– complex sensor
– limited crash protection
– vendor technician needed to
remove damaged sensor
– more downtime
– high repair charges
apply innovation
Renishaw scanning systems
Active and passive
scanning probe design
Renishaw scanning sensor
design
Performance styli for
scanning
Articulating heads
Slide 25
Probe and stylus changing
apply innovation
Renishaw scanning sensor design
Renishaw design objectives:
• optimised for high speed
measurement
• accurate position sensing without
stacked axis errors
• compact and light, with excellent
dynamic response
• models for quill mounting and use
with articulating heads
• passive design to avoid unnecessary
system complexity
Slide 26
SP600M mounted
on a PH10M indexing head
apply innovation
Renishaw scanning probes - quill mounted
Slide 27
SP80
• quill-mounted
• digital readheads for ultra-high
accuracy
• very long styli
SP600Q
• in-quill version of SP600
• reduced impact on
working volume
• suitable for any quill size
apply innovation
Renishaw scanning probes - for articulating heads
Slide 28
SP600M
• styli up to 300 mm
• flexible part access
• robust
• changeable with other
sensors
SP25M
• ultra-compact design (25 mm
diameter)
• styli up to 200 mm
• interchangeable with touchtrigger probing
apply innovation
Renishaw scanning probes - key characteristics
Passive sensor - no force
generators
• minimal heat source for greater
stability
• no electro-mechanical wear
• reduced vibration during discrete
point measurement
Slide 29
apply innovation
Renishaw scanning probes - key characteristics
Box spring mechanism - SP600 and SP80
• unique design
• compact mechanism - fits inside Ø50 mm
(2 in) probe
• low inertia
• rapid dynamic response
• low spring rates
• single 3D ferrofluid damper
Parallel acting
springs
Slide 30
apply innovation
Renishaw scanning probes - key characteristics
Pivoting probe
mechanism - SP25M
• patented, pivoting
mechanism featuring
‘isle of Man’ spring
• ultra-compact
mechanism - fits inside
a Ø25 mm (1 in) probe
• very low inertia
• very low spring rates
(< 60 g/mm)
Slide 31
• high natural frequency
(rigid member) when
in contact with the
component
‘Isle of Man’
spring creates
XY pivot point
Second spring
allows translation
in all direction
apply innovation
Renishaw scanning probes - key characteristics
Isolated optical metrology - SP600
• readheads attached to probe
housing
• measures deflection of whole
mechanism, not just one axis
Z pos
Readheads
attached to
probe body
– eliminates inter-axis errors
– picks up thermal and dynamic
effects
• probes with stacked axes cannot
measure inter-axis errors directly
Slide 32
Illustration shows
SP600 mechanism
with PSDs
Inter-axis error
Y pos
X pos
apply innovation
Renishaw scanning probes - key characteristics
Isolated optical metrology - SP80
• SP80 features digital readheads with
0.02 m resolution reading precision
gratings
• accuracy defined by straightness of
lines on each grating and calibrated
squareness of gratings, not by probe
mechanical design
ISO 10360-4 test data:
ISO Diff:
0.6 m
ISO Tij:
1.0 m
Slide 33
CMM spec
Test time
Controller
Filter
Stylus
0.5 + L / 1000
61 secs
UCC1
None
50 mm, 9 mm, ceramic
Note - results quoted are for
unknown path scans.
apply innovation
Renishaw scanning probes - key characteristics
Isolated optical metrology SP25M
• IREDs in probe body reflect
light off mirrors in stylus module
back onto PSDs
SP25M
probe body
2 PSDs
detect stylus
deflection
IRED
• non-linear outputs
compensated by sophisticated
3rd order polynomial algorithms
Slide 34
ISO 10360-4 test data:
ISO Diff:
1.3 m
ISO Tij:
2.6 m
Mirror
CMM spec
Test time
Controller
Filter
Stylus
Kinematic joint
between probe
body and stylus
module (not
shown)
0.5 + L / 1000
57 secs
UCC1
None
50 mm, 5 mm, ceramic
apply innovation
Renishaw scanning probes - key characteristics
Kinematic stylus changing

optimise stylus and hence
repeatability for each feature:
– minimum length
• Longer styli degrade repeatability
– maximum stiffness
– minimum joints
– maximum ball size
• Maximum effective working length
• repeatable re-location
– no need for re-qualification
• passive
Slide 35
– no signal cables
– easy installation
Kinematic stylus changing in
around 10 seconds means that
you can pick the best stylus for
each feature
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP80
• SP80 can support very long and
complex styli
• 500 mm (19.7 in)
• 500 g (17.6 oz)
• suitable for measurement of
deep features on large
components
• no need for counter-balancing
• full measurement range is
maintained irrespective of stylus
mass and orientation
Slide 36
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP80
Video commentary
• 500 mm (20 in) stylus cranked
stylus
• no counter-balancing needed
• scanning deep features in F1
engine block
SP80 scanning with a 500 mm
(20 in) stylus for access to
deep features
Slide 37
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP80
• deep bore measurement cranked / star styli
VDI / VDE test data:
V2 m
CMM spec:
Test speed:
Controller:
Filter:
Values:
1.75
1.5
1.25
1.0
0.75
0.5
0.25
Slide 38
0
50
100 150 200 250
Stylus length (mm)
0.5 + L / 1000
5 mm/sec
UCC1
50 Hz
Unknown path
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP600 family
Video commentary
• 200 mm (8 in) stylus
• scanning deep
features in a cylinder
block
• compact probe
dimensions further
extend the reach of the
probe
• styli up to 280 mm
(11.0 in) can be used
with SP600 probes
Slide 39
SP600 scanning with a 200 mm (8 in)
stylus for access to deep features
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP25M
• three scanning modules, each
optimised for a range of stylus lengths
• same measuring range and accuracy in
all orientations
• stiff carbon fibre stylus extensions
provide excellent effective working
length with M3 styli
• styli up to 200 mm (7.9 in)
Slide 40
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP25M
• ISO 10360-4 test data
• accurate form measurement, even with long styli
ISO Tij
m
ISO 10360-4 test data:
3.5
CMM spec:
Test speed:
Controller:
Filter:
Values:
3.0
2.5
2.0
Filtered (60 Hz harmonic)
1.5
No filter (raw data)
1.0
0.5
Slide 41
0.5 + L / 1000
5 mm/sec
UCC1
None / 60 Hz
Unknown path
0
22
50
100
200
Stylus length (mm)
22: 3 mm, SS stem
50: 5 mm, ceramic stem
100: 6 mm, GF stem
200: 6 mm, GF stem
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP25M
• probe is small enough to be
inserted into many features
• total reach can be extended,
with a probe extension, to
nearly 400 mm (15.7 in)
• including length of probe body
Slide 42
SP25M inspecting a deep
counter-bore
apply innovation
Renishaw scanning probes - key characteristics
Feature access - SP25M
• probe can be mounted on an
articulating head means that
many features can be accessed
with fewer styli
• lower stylus costs
• shorter cycle times
Slide 43
apply innovation
Renishaw scanning probes - key characteristics
Crash protection
• stylus change joint has low
release force
– over-travel in XY causes stylus to
detach
• Z crash protection
– outer housing provides a ‘bump
stop’ to prevent probe
mechanism and readhead
damage
Slide 44
Stylus deforms in a severe Z
crash, whilst probe
mechanism is protected
Note - same principles apply to
pivoting probes like SP25M.
apply innovation
Renishaw scanning probes - key characteristics
Crash protection
Slide 45
Renishaw scanning probes are robust - even
after bending or breaking the stylus, they still
work!
Video commentary
• steel stylus crushed
against SP600
• more severe than any
Z crash since E Stop
would prevent
continued force
• bump-stop protection
system saves probe
mechanism
• probe was still
functional after test
completed
apply innovation
Renishaw scanning probes - key characteristics
Circle C
Compression test data
Circle B
Stylus ball
shatters
Circle A
Circle D
Force (N)
ISO 10360-4
1800
CMM spec
Test time
Controller
Filter
Stylus length
1600
1400
1200
1000
800
(All data in m)
600
400
200
Slide 46
3 + L / 250
70 secs
UCC1
None
50 mm
0
0
0.5
1
1.5
2
Deflection (mm)
2.5
3
3.5
Circle
A
B
C
D
Before
4.0
3.7
1.7
3.3
After
3.8
3.2
1.7
2.9
Result
4.0
3.8
apply innovation
Renishaw scanning systems
Active and passive
scanning probe design
Renishaw scanning sensor
design
Performance styli for
scanning
Articulating heads
Slide 47
Probe and stylus changing
apply innovation
Stylus selection for scanning
Styli choice affects performance
• the stylus is a critical element in any
scanning system
• affects:
– feature access (stylus length and
configuration, effective working length)
– speed (weight affects dynamic response)
– repeatability (stiffness, joints)
– accuracy over time (wear, pick-up on
stylus)
Slide 48
• choice of stylus configuration and
materials must be driven by the
application
apply innovation
Stylus selection for scanning
Configuration
• keep styli as short and as stiff as
possible
– avoid joints
– articulating heads reduce the need
for long styli
• where longer styli are essential,
choose single-piece styli made from
performance materials (e.g. M5
range for SP80):
– graphite fibre stems (light and stiff)
– titanium fittings
Slide 49
Long graphite fibre
stylus
apply innovation
Effects of continuous scanning on stylus balls
Three phenomena that can affect scanning accuracy
• in touch trigger probing, the stylus ball comes into temporary
contact with the measured surface
• scanning results in a different and more aggressive type of
surface interaction between the stylus and the workpiece
• testing at Renishaw has revealed three interactive
phenomena:
1. Debris
2. Adhesive wear
3. Abrasive wear
Slide 50
Sliding interaction
between ball and
surface
apply innovation
Effects of continuous scanning on stylus balls
Phenomenon 1 - debris
• any contamination present on the scanning path will collect
on the stylus ball as it passes over the surface
– metal oxide particles on the surface
– air-born debris such as coolant mist or paper dust
• debris can be removed by wiping
the ball with a dry, lint-free cloth
– a periodic cleaning regime for the
stylus ball is the only solution to
avoid a build up of debris
Slide 51
– debris is practically unavoidable
with any contact scanning
application and is independent of
the stylus ball or scanned
surface material
Typical debris collected on a
stylus ball after scanning
apply innovation
Effects of continuous scanning on stylus balls
Phenomenon 2 - adhesive wear
• adhesive wear (sometimes referred to as pick-up) involves the
transfer of material from one surface to another
– local welding (adhesion) at microscopic contact points
– break off during sliding
– minute particles from one surface are transferred to the other surface
• material adhesion is permanent and cannot be removed
through normal cleaning techniques
Slide 52
– as the surface material from the workpiece starts to adhere to the
ball, it is the attached material which is now in contact with the
surface
– as like materials attract, rapid build up can occur
– will eventually degrade the form of the stylus ball
– compromised measuring results
apply innovation
Effects of continuous scanning on stylus balls
Phenomenon 2 - adhesive wear
• factors affecting adhesive wear:
– contact force
– distance scanned
– hardness of surfaces (if stylus is much harder than surface being
measured)
– affinity between ball and surface materials … is it a similar material?
– single point contact
• such conditions apply when scanning an aluminium surface with a
relatively hard ruby (aluminium oxide) stylus ball
Slide 53
– significant wear only occurs after long periods scanning the same part
– in most real applications, the amount of material transfer is negligible
on the form of the stylus ball (< 0.1 m) and cannot be quantified, even
with the highest precision measuring equipment
apply innovation
Effects of continuous scanning on stylus balls
Phenomenon 2 - adhesive wear
• significant errors only occur in unrepresentative situations:
Slide 54
Test conditions:
Test conditions:
• ruby stylus on aluminium
• 15 g contact force, single point contact
• 350 m scan path over new material
• ruby stylus on aluminium
• 15 g contact force, single point contact
• 350 m scan path over repeated path
Results:
Results:
• small patch where adhesion occurs
• negligible impact on ball form
• 200 m x 500 m adhesion patch
• 2 m impact on ball form
apply innovation
Effects of continuous scanning on stylus balls
Phenomenon 3 - abrasive wear
• abrasive wear involves removal of material from both surfaces
– small particles from both surfaces break and adhere to each surface
– harder stylus particles attached to the component surface begin to act
as an abrasive
– where there is little atomic attraction between the two materials, wear
rather than material build up occurs
Test conditions:
• ruby on stainless steel
• 15 g contact force, single point contact
• 5,600 m scan path over new material
• very extreme - unrepresentative of most applications
Results:
Slide 55
• flat on ball surface approx. 150 m diameter
• form error of 1.5 m
apply innovation
Stylus selection for scanning
Ball material - conclusions from
testing at Renishaw
• ruby can suffer adhesive wear
(pick-up) on aluminium under
extreme conditions, but
performs well in most
applications
• ruby is the best material on
stainless steel
Ruby stylus used in touchtrigger mode
Slide 56
apply innovation
Stylus selection for scanning
Ball material - conclusions from
testing at Renishaw
• silicon nitride is a good
substitute for ruby in extreme
aluminium applications, but
suffers from abrasive wear on
stainless steel and cast iron
Silicon nitride stylus tip
scanning an aluminium
component
Slide 57
apply innovation
Stylus selection for scanning
Ball material - conclusions from
testing at Renishaw
• zirconia is the optimum choice for
scanning cast iron components
• tungsten carbide also performs
well on cast iron
Zirconia is often used where
a large diameter tip is
required
Slide 58
Zirconia stylus tip and
graphite fibre stem
apply innovation
Renishaw scanning systems
Active and passive
scanning probe design
Renishaw scanning sensor
design
Performance styli for
scanning
Articulating heads
Slide 59
Probe and stylus changing
apply innovation
Articulation or fixed sensors?
Articulating heads are a standard
feature of most computercontrolled CMMs
– heads are the most cost-effective
way to measure complex parts
Fixed probes are best suited to
small machines on which simple
parts are to be measured
– ideal for flat parts where a single
stylus can access all features
Slide 60
apply innovation
Renishaw articulating heads
Increased flexibility…

easy access to all features on the part

repeatable re-orientation of the probe

reduced need for stylus changing

optimise stylus stiffness for better
metrology
Reduced costs…
Slide 61

indexing is faster than stylus changing

less expensive than active scanning
systems

reduced stylus costs

simpler programming
apply innovation
Renishaw articulating heads for scanning
Slide 62
PH10M
• indexing head
• the industry
standard
PH10MQ
• in-quill version of
PH10M
• reduced impact on
working volume
• needs 80 mm quill
PHS1
• servo positioning head
• infinite range of
orientations
• longer extension bars
apply innovation
Articulating head applications
Flexible probe orientation
• PH10M offers 7.5°
increments in 2 axes - is
this enough?
• prismatic parts
– generally few features at
irregular angles
– use a custom stylus to suit
the angle required
Slide 63
– fixed scanning probes also
need customer styli for
such features
Knuckle joint
needed to
access
features at
irregular
angles
apply innovation
Articulating head applications
Flexible probe orientation
• PH10M offers 7.5° increments in 2
axes - is this enough?
• sheet metal / contoured parts
– many features at different irregular
angles
– stylus must be perfectly aligned with
surface in each case
– no indexing head is suitable
Slide 64
– fixed probes also unsuitable due to need
for many stylus orientations
– need continuously variable head (PHS1)
Cylindrical
stylus must be
perfectly
aligned with
hole
Sheet
metal
apply innovation
PH10M indexing head - design characteristics
Head repeatability test results:
• Method:
– 50 measurements of calibration sphere at {A45,B45}, then 50 with
an index of the PH10M head to {A0,B0} between each reading
• TP200 trigger probe with 10mm stylus
• Results:
Result
X
Y
Z
Span fixed
0.00063
0.00039
0.00045
Span index
0.00119
0.00161
0.00081
 [Span]
0.00056
0.00122
0.00036
 [Repeatability]
± 0.00034
± 0.00036
± 0.00014
• Comment:
Slide 65
– indexing head repeatability has a similar effect on measurement
accuracy to stylus changing repeatability
apply innovation
PH10M indexing head - design characteristics
Indexing repeatability affects the
measured position of features
– Size and form are unaffected
Most features relationships are
measured ‘in a plane’
– Feature positions are defined relative
to datum features in the same plane
(i.e. the same index position)
• Datum feature used to establish a part
co-ordinate system
Slide 66
– Therefore indexing typically has no
negative impact on measurement
results, but many benefits
apply innovation
PH10M indexing head - design characteristics
Light weight
• 650 g (1.4 lbs)
• lightest indexing head available
• total weight of < 1 kg including scanning
probe
Fast indexing
• typical indexing time is 2 to 3 seconds
• indexes can occur during positioning
moves
– no impact on measurement cycle time
Slide 67
apply innovation
PH10M indexing head - design characteristics
Flexible part access
Slide 68
Rapid indexing during CMM positioning moves
give flexible access with no impact on cycle times
apply innovation
PH10M indexing head - design characteristics
Autojoint
• programmable sensor changing with no
manual intervention required
• use scanning and touch-trigger probes in
the same measurement cycle
Slide 69
Autojoint features
kinematic connection
for high repeatability
apply innovation
PHS1 servo head - design characteristics
Servo positioning for total flexibility
• full 360° rotation in two axes for total
flexibility of part access
– resolution of 0.2 arc sec
– equivalent to 0.1µm at 100mm radius
• servo control of both axes for infinitely
variable positioning and full velocity
control
– speeds of up to 150° per second
– 5-axis control required
Slide 70
apply innovation
PHS1 servo head - design characteristics
High torque for long reach
• extension bars of up to 750 mm
(30 in)
– ideal for auto body inspection
– touch-trigger probes only
• Autojoint for use with SP600M
• powerful motors generate 2 Nm
torque
– 4 times more than a PH10
Slide 71
– carry probes and extension bars of
up to 1 kg (2.2 lbs)
apply innovation
PHS1 servo head - design characteristics
Infinitely variable positioning
Slide 72
PHS1’s motion can be combined with the CMM
motion to generate blended 5 axis moves
apply innovation
Renishaw scanning systems
Active and passive
scanning probe design
Renishaw scanning sensor
design
Performance styli for
scanning
Articulating heads
Slide 73
Probe and stylus changing
apply innovation
ACR3 probe changer for use with PH10M
• 4 or 8 changer ports
– store a range of sensors,
extensions and stylus
configurations
• Passive mechanism
Slide 74
– CMM motion used to lock and
unlock the Autojoint for secure and
fully automatic sensor changes
Compact rack with
minimal footprint
apply innovation
New ACR3 probe changer for use with PH10M
Probe changing
Video commentary
• new ACR3 sensor
changer
• no motors or
separate control
• change is controlled
by motion of the
CMM
Slide 75
Quick and repeatable sensor changing for
maximum flexibility
apply innovation
ACR2 probe changer for use with PHS1
Probe module changing
• flexible storage of probes and extension bars
Slide 76
apply innovation
FCR25 module and stylus changing for SP25M
Passive rack enables both
module and stylus changing
• modular rack system
• switch between scanning
modules to suit application
• switch between scanning
and touch-trigger modules
Two sensors in one switching between scanning
and touch-trigger probing
modules
Slide 77
apply innovation
FCR25 module and stylus changing for SP25M
Passive rack enables both module
and stylus changing
• change styli to suit measurement
task
– scanning styli up to 200 mm
– full range of TP20 modules
• combine with ACR3 for sensor
changing
Typical changing routine:
• stow TTP stylus
• stow TTP module
• pick up scan module
• pick up scan stylus
Slide 78
apply innovation
SP600 stylus changing
Passive rack
• simple design
• rapid stylus changes
• storage for up to 4 stylus modules
– any number of racks can be used in
a system
• kinematic stylus changing
mechanism
– highly repeatable connection
between stylus and probe,
– styli can be stored and re-used
without the need for qualification
Slide 79
• crash protection from an overtravel
mechanism in the base of the rack
Rapid stylus changing with the
passive SCR600 stylus change
rack
apply innovation
Renishaw scanning - our offering
• the fastest and most accurate scanning
– passive scanning probes with dynamically
superior mechanisms
– sophisticated probe calibration
– performance styli to match your application
• the most flexible and productive solution
– probe changing
– stylus changing
– articulation
• the lowest ownership costs
Slide 80
– innovative hardware and scanning techniques
reduce complexity
– robust designs and responsive service for
lower lifetime costs
apply innovation
Responsive service and expert support
Application and product support wherever you are
• Renishaw has offices in over 20 countries
• responsive service to keep you running
• optional advance RBE (repair by exchange) service on many products
• we ship a replacement on the day you call
• trouble-shooting and FAQs on www.renishaw.com/support
Service facility
at Renishaw
Inc, USA
Slide 81
apply innovation
Questions?
apply innovation
Slide 82