Renishaw LP2 User manual

Installation and user’s guide
H-2000-5021-07-A
LP2 probe system

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© 2000–2020 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.
Renishaw plc. Registered in England and Wales.
Company no: 1106260. Registered ofce:
New Mills, Wotton-under-Edge, Gloucestershire,
GL12 8JR, UK.
Renishaw part no: H-2000-5021-07-A
Issued: 10.2020

1Contents
Safety..................................................................2
Introduction........................................................4
LP2 probe types.................................................5
LP2 modular system .........................................6
LP2 probe moves...............................................7
Specication ......................................................9
Dimensions ......................................................11
Recommended connection diagram for
LP2 with HSI-C interface.................................12
Recommended connection diagram for
LP2 with HSI interface.....................................13
Recommended connection diagram for
LP2 with MI 8-4 interface.................................14
Typical LP2 probe systems ............................15
Machining centres
(radio transmission).....................................15
Machining centres with OMM-2 with OSI
or OSI-D interface or OMI-2 / OMI-2T /
OMI-2H interface/receiver
(optical transmission) ..................................16
Machining centres with an OMM-2C with
OSI or OSI-D interface
(optical transmission) ..................................17
Machining centres
(hard-wired transmission)............................18
Machining centres
(hard-wired transmission, tool setting) ........19
Lathes (radio transmission).........................20
Lathes (optical transmission) ......................21
Lathes (hard-wired transmission)................22
Stylus spring pressure adjustment
– gauging force................................................23
Stylus on-centre adjustment with probe
holders and sockets........................................24
Stylus on-centre adjustment with shank
adaptor or shank .............................................25
Screw torque values........................................27
Software requirements....................................28
Service and maintenance ...............................29
Fault-nding.....................................................31
Part list .............................................................33
General information ........................................35

2
Safety
Information to the user
In all applications involving the use of machine
tools or CMMs, eye protection is recommended.
Refer to the machine supplier’s operating
instructions.
The LP2 system must be installed by a
competent person, observing relevant safety
precautions. Before starting work, ensure that the
machine tool is in a safe condition with the power
switched OFF and the power supply to the HSI-C /
HSI / MI8-4 is disconnected.
Information to the machine supplier/installer
It is the machine supplier’s responsibility to
ensure that the user is made aware of any
hazards involved in operation, including those
mentioned in Renishaw product literature, and
to ensure that adequate guards and safety
interlocks are provided.
If the probe fails, the probe signal may falsely
indicate a probe seated condition. Do not rely
on probe signals to halt the movement of the
machine.
Information to the equipment installer
All Renishaw equipment is designed to comply
with the relevant EU and FCC regulatory
requirements. It is the responsibility of the
equipment installer to ensure that the following
guidelines are adhered to, in order for the product
to function in accordance with these regulations:
• any interface MUST be installed in a position
away from any potential sources of electrical
noise (for example, power transformers,
servo drives);
• all 0V/ground connections should be
connected to the machine “star point” (the
“star point” is a single point return for all
equipment ground and screen cables). This
is very important and failure to adhere to this
can cause a potential difference between
grounds;
Safety

3
• all screens must be connected as outlined in
the user instructions;
• cables must not be routed alongside high
current sources (for example, motor power
supply cables), or be near high-speed data
lines;
• cable lengths should always be kept to a
minimum.
Equipment operation
If this equipment is used in a manner not
specied by the manufacturer, the protection
provided by the equipment may be impaired.
Safety

4 Introduction
Introduction
The LP2 is a compact and versatile probe for
applications on CNC lathes and machining
centres. A wide range of styli and accessories is
available to provide custom installations.
Principal applications
Horizontal lathes
Small enough to t on a turret for part measuring,
tool setting and broken tool detection when
mounted in a suitable position.
Machining centre applications
Set-up and part measuring when spindle
mounted. Tool setting and broken tool detection
when table mounted.
Signal transmission systems
• Hard-wired – a range of hard-wired probe
sockets is available for inspection and tool
setting applications. For machining centres
with manual tool change the LP2 will t the
MA2 probe holder.
• Optical or radio – for lathes and machining
centres. Easy installation, particularly in
retrot applications because there is no
need for the prepared passageways required
for hard-wired transmission cables. LP2
can be used with OMP40M, OMP60M,
RMP40M, RMP60M.
Interface unit
A hard-wired installation with LP2 may use the
following interfaces:
• HSI-C interface, see the HSI-C hard-wired
system interface – congurable installation
guide (Renishaw part no. H-6527-8501).
• HSI interface, see the HSI hard-wired
system interface installation guide
(Renishaw part no. H-5500-8554).
• MI8-4 interface, see the MI 8-4 interface unit
installation and user’s guide (Renishaw part
no. H-2000-5008).
The FS1i and FS2i probe sockets with integral
interface may also be used, see the FS1i and
FS2i sockets data sheet (Renishaw part no.
H-2000-2073).

5LP2 probe types
There are four versions of the LP2 probe.
Each version is best suited to particular
applications.
LP2 – For normal setting/inspection. The
metal eyelid protects the diaphragm in a hot
chip and coolant environment.
LP2H – With higher stylus pressure for long
or heavy styli, or where there is excessive
machine vibration.
LP2DD – LP2HDD – The double diaphragm
(DD) arrangement is recommended for
grinding machines and other applications
with particle-laden coolant. The LP2HDD is a
version with a higher stylus spring pressure,
similar to the LP2H.
1. Stylus – M4 thread
2. Metal eyelid
3. Spring
4. Diaphragm
5. Rear O-ring
6. M16 thread
7. Stylus spring pressure adjustment
8. Swarf deector – essential for LP2DD
and LP2HDD when continually exposed
to hot chips.
*
Stylus spring pressure adjustment not available
LP2DD probes are available as original equipment,
or existing LP2 probes may be converted to the DD
standard using a conversion kit.
44
7
*
1
2
3456
7
*
8
LP2
LP2H
LP2DD
LP2HDD

6 LP2 modular system
M4 styli
Stylus weak link
Swarf deector
Radio or
optical
receiver
FS3
FS2
FS1
Probe sockets
Transmission module
LP2 LP2H LP2DD LP2HDD
Hard-wired transmission
Shank
MA2 probe
holder
Shank adaptor
Square holder
LPE extension bar MA 4 adaptor

7
LP2 probe moves
With a double touch sequence, the rst move
nds the surface quickly, then the probe is
reversed to a position clear of the surface before
making the second touch at a slower feedrate,
thereby recording the surface position at a higher
resolution.
Probe trigger
A probe trigger signal is generated when the
probe’s stylus is driven against a surface. The
machine control records the contact position and
instructs the machine motion to stop.
Although high probing speeds are desirable, it is
essential to choose a probing velocity which allows
the machine to stop within the limits of stylus
overtravel and machine measuring capability.
Follow feedrate guidelines given by the supplier.
To ensure a trigger signal is generated, drive the
probe against the workpiece to a target beyond
the expected surface, but within the limits of stylus
overtravel.
After the probe stylus touches the surface, reverse
clear of the surface.
Single and double touch
If the probe operating sequence is based on a
single touch, then, following a gauging move, the
probe may be returned to its start point.
With some types of controllers, it is an advantage
to use a double touch method as poor repeatability
can result from using higher feedrates.
Z
1
Start position
Overtravel limits (see page 10)
2
X/Y

8LP2 probe moves
System delays
System delays are repeatable to less than 2µs,
and are constant in each direction in which
measurement is taken.
Delays are automatically compensated for,
provided a calibration move is made in the
same direction and at the same velocity as each
measurement move.
Calibrating a system
Calibrate the probe system at a constant
measurement speed in the measurement
direction, to automatically compensate for errors,
in the following circumstances:
1. Before the system is used.
2. When a new stylus is used.
3. If the stylus is bent.
4. To allow for machine thermal growth.
5. Where there is poor shank relocation
repeatability in the machine spindle.

9Specication
Variants LP2 / LP2DD LP2H / LP2HDD
Principal application Workpiece inspection and job set-up on all sizes of lathes, machining centres and
CNC grinders.
Transmission type Hard-wired, or in conjunction with optical or radio transceiver modules.
Compatible
interfaces
Hard-wired
Optical
Radio
HSI, HSI-C, MI 8-4, FS1i or FS2i
OMI-2 / OMI-2T / OMI-2H / OSI or OSI-D with OMM-2 or OMM-2C
RMI-Q
Recommended styli 50 mm (1.97 in) to 100 mm (3.94 in)
Stylus material depends on application.
50 mm (1.97 in) to 150 mm (5.91 in)
Stylus material depends on application.
Weight 65 g (2.29 oz)
Sense directions ±X, ±Y, +Z
Unidirectional repeatability 1.00 µm (40 µin) 2s(see note 1) 2.00 µm (80 µin) 2s(see note 1)
Stylus trigger force
(see notes 2 and 3)
XY low force
XY high force
+Z direction
0.50 N, 51 gf (1.80 ozf)
0.90 N, 92 gf (3.24 ozf)
5.85 N, 597 gf (21.04 ozf)
2.00 N, 204 gf (7.19 ozf)
4.00 N, 408 gf (14.39 ozf)
30.00 N, 3059 gf (107.91 ozf)

10
NOTE: For stylus recommendations, refer to the Styli and accessories technical specication
(Renishaw part no. H-1000-3200).
Note 1 Performance specication is tested at a standard test velocity of 480 mm/min (18.9 in/min) with a 35 mm stylus. Signicantly
higher velocity is possible depending on application requirements.
Note 2 Trigger force, which is critical in some applications, is the force exerted on the component by the stylus when the probe
triggers. The maximum force applied will occur after the trigger point (overtravel). The force value depends on related
variables including measuring speed and machine deceleration.
Note 3 These are the factory settings; manual adjustment of the LP2 / LP2DD is possible, but the LP2H / LP2HDD is not adjustable.
Stylus overtravel limits LP2 LP2DD LP2H LP2HDD
±X / ±Y 14.87 mm
(0.55 in)
±12.5°
19.06 mm
(0.73 in)
±15°
14.87 mm
(0.55 in)
±12.5°
19.06 mm
(0.73 in)
±15°
Z6.5 mm (0.26 in)
4.5 mm (0.18 in) when fitted with a swarf
deflector
5.0 mm (0.20 in)
4.5 mm (0.18 in) when fitted with a swarf
deflector
Mounting M16 thread, for LPE extension bars and adaptors.
Sealing IPX8, BS EN 60529:1992+A2:2013
(IEC 60529:1989+A1:1999+A2:2013)
Storage temperature −25 °C to +70 °C (−13 °F to +158 °F)
Operating temperature +5 °C to +55 °C (+41 °F to +131 °F)
Specication

11
Dimensions given in mm (in)
Dimensions
LP2 – LP2H
LP2DD – LP2HDD
7.5 (0.30)
6.5 (0.26)
40.8 (1.61)
Ø25 (0.98)
20 (0.79)
Ø7 (0.27)
M16 × 1
12.5°
12.5°
M4 stylus
4.8 (0.19)
6.5 (0.26)
40.8 (1.61)
Ø25 (0.98)
20 (0.79)
Ø7 (0.27)
M16 × 1
15°
15°
M4 stylus

12 Recommended connection diagram for LP2 with HSI-C interface
NOTES:
When connecting
the LP2 probe to the
HSI-C interface, use
the connection labelled
STANDARD PROBE.
When the SSR output is
connected as normally
open (NO), the LP2
probe will remain in the
non-triggered (seated)
state if the power
supply is interrupted or
if the probe is damaged.
Probe
status
Normally
open
(NO)
Normally
closed
(NC)
Probe
triggered
Closed Open
Probe
seated
Open Closed
HSI-C interface
SSR probe type and external
LED connector (5-way)
29. Probe type NO
28. Probe type common
27. Probe type NC
26. External LED 10 Vdc
25. External LED 0 Vdc
SSR probe status connector
(5-way)
24. Probe status NO
23. Probe status common
22. Probe status NC
21. Not connected
20. Not connected
Inhibit connector (5-way)
10. Inhibit input
11. Inhibit return
12. 0 Vdc
13. +12 Vdc to +30 Vdc out
(fused at 100 mA)
14. Not connected
Power connector (4-way)
1. +12 Vdc to 30 Vdc supply input
2. 0 Vdc supply
3. 0 Vdc supply
4. Screen
Probe connector (5-way)
19.
18.
17. Screen
16. Standard probe input +
15. Standard probe input −
FS1 /FS2 probe holder xed
socket for standard probe
No screen connection
*
*
*
CNC
controller
+12 Vdc to 30 Vdc
0 Vdc
Machine ground
(“star point”)
Connect either
pin24 or pin22,
but do not connect
both pins
Connect either
pin29 or pin27,
but do not connect
both pins
Block 4
Block 1
Block 3
Block 5
Block 6
Probe inhibit function.
Refer to the HSI-C hard-
wired system interface
– congurable installation
guide (Renishaw part
no. H-6527-8501) for
connection information
Outer spring pin, Green
Inner spring pin, Blue
Green/Yellow

13
NOTES:
When connecting
the LP2 probe to the
HSI interface, use the
connection labelled
STANDARD PROBE.
When the SSR output is
connected as normally
open (NO), the LP2
probe will remain in the
non-triggered (seated)
state if the power
supply is interrupted or
if the probe is damaged.
Recommended connection diagram for LP2 with HSI interface
HSI interface
1 0 V
2 Inhibit return
3 Inhibit
4 External LED 0 V
5 External LED 10 V
6 NO*
7 Common
8 NC**
10 Screen
CNC controller
Standard connector (3 way)
Controller connector (12 way)
11 Supply 0 V
12 Supply 12 V to 30 V
9 12 V to 30 V out (fused 100 mA)
Status
Output
SSR
Power
input
1 Probe input +
2 Probe input −
3 Screen
0 Vdc
12 Vdc to 30 Vdc
Screen
Controller protective earth
(also referred to as PE
starpoint or earthplate)
Probe
input
I/O supply
skip input
Connect either pin 6 or pin 8,
but do not connect both wires
Probe inhibit
function, see
HSI hard-wired
system interface
installation guide
(Renishaw part no.
H-5500-8554)
Inner spring pin
Outer spring pin
Probe holder xed socket for
LP2 probe
Controller reference ground
Probe
status
*Normally
open
(NO)
**Normally
closed
(NC)
Probe
triggered
Closed Open
Probe
seated
Open Closed

14
Power to
interface
CNC controller
+Vdc
0 Vdc
Controller
protective
earth **
Controller
protective
ground
Green/Yellow
Optional
+Vdc from I/O supply
Skip input (G31)
−Vdc from I/O supply
MI 8-4 interface
A10 output + supply
A11 probe status output (totem pole)
A12 output - supply
B4 SELX−
B5 X−
B6 SELX+
B7 X−
B8 SELZ−
B9 Z−
B10 SELZ+
B11 Z+
A7 inspection select
A8 inhibit
A9 input resistors common
Power input
B1 +Vdc
B2 0 Vdc
B3 screen
Green/Yellow
Green/Yellow
Green/Yellow
Inspection system input + A4
Inspection system input −A5
Screen A6
Probe
input
Screen A1
Probe + A2
Probe −A3
Optional
Inspection
probe
Inspection
probe
interface
Blue
Green LP2 Probe
LP2
Machine tool
**Can also be referred to as ‘PE starpoint’ or ‘earthplate’
For more information regarding these connections, see the MI8-4 interface
unit installation and user’s guide (Renishaw part no. H-2000-5008).
Recommended connection diagram for LP2 with MI 8-4 interface

15Typical LP2 probe systems
Machining centres (radio transmission)
CNC
machine
controller
RMI-Q receiver
Workpiece
LP2 probe
Stylus
Typical radio
module
CNC machine
spindle
Cable
Mounting
bracket

16
Machining centres with OMM-2 with OSI or OSI-D interface or
OMI-2 / OMI-2T / OMI-2H interface/receiver (optical transmission)
CNC machine
controller
OMI-2/
OMI-2T/OMI-2H
Workpiece
LP2 probe
Stylus
Typical optical
module
CNC machine
spindle
Typical LP2 probe systems
CNC machine
controller
OMM-2
Mounting
bracket
OSI or OSI-D
interface unit