Information leaflet
H-5465-8102-02-A
Styli recommendations for OSP60
SPRINT™ scanning probes
The SPRINT™ on-machine scanning system can be used with a range of
SPRINT-specific styli to suit individual application requirements, all of which
complement the enhanced capability provided by the OSP60 SPRINT probe.
SPRINT-specific styli are available in two ranges: the SPRINT standard range, which is suitable for the majority of applications,
and the SPRINT calibrated range (UKAS certified), which is designed for the most demanding applications. Both ranges
incorporate a number of design elements which offer improved metrology performance for machine tool scanning applications.
SPRINT standard range
During scanning the stylus is constantly deflected, so the
ceramic stem has been designed to be narrow and therefore
tightly control all squareness tolerances. This ensures that
even when measuring a part with vertical surfaces, such as on
prismatic parts, the risk of the stylus shank contacting the part
before the stylus tip is minimised.
SPRINT calibrated range
In the variable temperature environment typical of a machine
tool, the dimensional variation of the calibration sphere,
compared with the machine structure, can degrade the
performance of the measurement system. In the highest
accuracy applications, this contribution to the overall system
measurement uncertainty can be significant.
To ensure the highest possible measurement accuracy in all
measurement conditions, the ball on each stylus within the
SPRINT calibrated range is measured and UKAS certified.
The exact ball diameter is engraved onto the stylus holder, so
that this highly accurate value can be applied during probe
calibration as an absolute reference.
Information leaflet
Styli for the SPRINT system
6 mm ball diameter SPRINT styli
B
D
AM4
C
Part number
(standard)
Part number
(calibrated)
A
Ball diameter mm (inch) 6.0 (0.24) 6.0 (0.24) 6.0 (0.24) 6.0 (0.24)
B
C
D
* ESWL = Effective Scanning Working Length, measured from the centre of the ball to the point at which the stem will foul against a vertical face when at the maximum
scanning deflection.
Length mm (inch) 100.0 (3.94) 150.0 (5.91) 100.0 (3.94) 150.0 (5.91)
Stem diameter mm (inch) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15)
ESWL* mm (inch) 62.9 (2.48) 71.5 (2.81) 62.9 (2.48) 71.5 (2.81)
Mass (grammes) 6.5 8.0 6.5 8.0
A-5004-4472
Ruby
A-5465-8576
Ruby
A-5004-4474
Ruby
A-5465-8577
Ruby
A-5004-6470
Silicon nitride
A-5465-5008
Silicon nitride
A-5004-6471
Silicon nitride
A-5465-5009
Silicon nitride
2 mm to 4 mm ball diameter SPRINT styli
B
D
M4
E
Part number
(standard)
Part number
(calibrated)
A
Ball diameter mm (inch) 2.0 (0.08) 3.0 (0.12) 4.0 (0.16) 2.0 (0.08) 3.0 (0.12) 4.0 (0.16)
B
C
D
E
* ESWL = Effective Scanning Working Length, measured from the centre of the ball to the point at which the stem will foul against a vertical face when at the maximum
Length mm (inch) 80.0 (3.15) 100.0 (3.94) 100.0 (3.94) 80.0 (3.15) 100.0 (3.94) 100.0 (3.94)
Stem diameter mm (inch) 1.5 (0.06) 2.0 (0.08) 2.0 (0.08) 1.5 (0.06) 2.0 (0.08) 2.0 (0.08)
ESWL* mm (inch) 10.7 (0.42) 27.0 (1.06) 42.6 (1.68) 10.7 (0.42) 27.0 (1.06) 42.6 (1.68)
Stem diameter mm (inch) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15) 3.8 (0.15)
Mass (grammes) 5.9 7.4 7.4 5.9 7.4 7.4
scanning deflection.
A-5004-6463
Ruby
A-5465-5001
Ruby
A-5004-6464
Ruby
A-5465-5002
Ruby
A-5004-6465
Ruby
A-5465-5003
Ruby
C
A-5004-6467
Silicon nitride
A-5465-5005
Silicon nitride
A
A-5004-6468
Silicon nitride
A-5465-5006
Silicon nitride
A-5004-6469
Silicon nitride
A-5465-5007
Silicon nitride
Notes on stylus selection
Standard M4 styli which are not SPRINT-specific may also be used with an OSP60 probe, but the effective scanning working
length (ESWL) will be restricted.
Stylus ball material
The material being scanned dictates the stylus ball material to be used.
• Ruby: Ruby is the optimum stylus ball material for the vast majority of measurement applications. It offers exceptional surface
smoothness, excellent compressive strength and a high resistance to mechanical corrosion.
• Silicon nitride: When scanning titanium alloys with coolant, silicon nitride (a very hard and wear-resistant ceramic) is
recommended.
Stylus ball size
Keep the ball as large as possible, consistent with the features to be scanned. This maximises the ball/stem clearance, which
reduces the chance of fouling on the stylus stem.
Smaller features are best scanned with a smaller ball. The minimum recommended ball size for use with the OSP60 probe is
2 mm (0.08 in).
SPRINT styli ball diameters have a guaranteed ball diameter tolerance of ±2 μm (79 μin).
Stylus ball sphericity
SPRINT styli use Grade 5 balls that have a maximum sphericity of 0.13 μm (5 μin).
Stylus stem length
When using an OSP60 SPRINT probe, Renishaw recommends the use of SPRINT styli with a ball diameter of 2 mm to 6 mm
(0.08 in to 0.24 in) and a stem length of 80 mm to 150 mm (3.15 in to 5.91 in). If the application requires a stylus outside this
range, please contact your local Renishaw distributor.
Stylus stem assembly
Minimise the number of joints in the stylus stem. Every joint between a stylus and any extensions introduces potential
bending and deflection points. SPRINT styli are designed with a minimum number of constituent parts, joined together using
high-specification, oven-cured adhesive.
Stylus stem material
SPRINT styli stems are made of materials that optimise the stiffness and ESWL of the stylus, combining stainless steel,
tungsten carbide and ceramic. Ceramic stems are used for scanning due to their low mass, high stiffness and thermal stability.
Styli with carbon fibre stems are not recommended for use with an OSP60 probe.
Stylus stem type
OSP60 SPRINT probes are only suitable for use with straight styli.
Custom design service
If you cannot achieve your objectives using our range of SPRINT styli, Renishaw can provide you with a solution for your custom
probing scanning applications. Renishaw’s Styli and Fixturing Products Division has supplied over 5,000 different custom styli
into probing applications worldwide. For advice and further details, please contact your local Renishaw distributor.
Always use genuine Renishaw styli or your probe performance will be compromised.
Renishaw plc
New Mills, Wotton-under-Edge,
Gloucestershire, GL12 8JR
United Kingdom
+44 (0)1453 524524
T
+44 (0)1453 524901
F
uk@renishaw.com
E
www.renishaw.com
For worldwide contact details, please visit our
main web site at www.renishaw.com/contact
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.
© 2013–2014 Renishaw plc. All rights reserved. Part no. H-5465-8102-02-A Issued: 09.2014
*H-5465-8102-02*
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