renishaw MIH User Guide
MIHUserGuide
Document part number H-1000-5200-09-A
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MIHdisclaimer
© 2001 - 20011 Renishaw plc. All rights reserved.
Renishaw® is a registered trademark of Renishaw plc.
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
Considerable effort has been made to ensure that the contents of this document are free from
inaccuracies and omissions. However, Renishaw makes no warranties with respect to the
contents of this document and specifically disclaims any implied warranties. Renishaw reserves the
right to make changes to this document and to the product described herein without obligation
to notify any person of such changes.
Trademarks
All brand names and product names used in this document are trade names, service marks,
trademarks, or registered trademarks of their respective owners.
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FCC(USAonly)
Informationtouser(47CFR§15.105)
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the installation manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference, in which case
you will be required to correct the interference at your own expense.
Informationtouser(47CFR§15.21)
The user is cautioned that any changes or modifications not expressly approved by Renishaw plc or
authorised representative could void the user’s authority to operate the equipment.
Labellingrequirements(47CFR§15.19)
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
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.
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MIHgeneralinformation
Careofequipment
Renishaw probes and associated systems are precision tools used for obtaining precise
measurements and must therefore be treated with care.
Changestoequipment
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.
Warranty
Renishaw plc warrants its equipment 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 for Renishaw equipment. 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.
Patents
The features of Renishaw’s manual indexable head and associated products are the subject of the
following patents, patent applications and registered designs.
EP 0142373 JP 2,098,080 US 4651405
EP 0293036 JP 3,018,015 US 5,088,337
EP 0392660 US Des 327854
Registered design (France): FR 278857
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MIHintroduction
MIH
Renishaw’s MIH is a compact manual indexable probe head which offers the fl exibility and time
saving normally associated with direct computer controlled (DCC) machines and motorised probe
heads.
The MIH is adjustable in two axes, both of which can be unlocked by a single thumbwheel operation.
A probe/stylus combination can be orientated to 720 different positions and, once the head is locked,
each position will be repeatable to 1 μm* (0.00004 in) (2σ). Hence the user can return to any chosen
position without having to requalify the probe/stylus tip.
The current position is shown on the integral liquid crystal display (LCD) and is constantly updated
during moves.
The programmable memory facility allows pre-datumed positions to be stored in a memory within the
head. Direction arrows shown on the LCD take the user back to any one of 20 memorised positions
which can be arranged in any order to suit a particular inspection sequence. The sequence can be
edited as required.
Probes are attached to the MIH by means of the Renishaw autojoint, allowing the user to easily
exchange probes whilst maintaining repeatability to 0.5 μm* (0.00002 in) (2σ). The autojoint is
recessed into the head, thus maximising the valuable working volume of the machine.
* Measured at 67 mm (2.64 in) from autojoint (TP6A probe with 21 mm (0.83 in) stylus).
Features
• Manually indexable in 2 axes
• Positionally repeatable to 1 μm* (0.00004 in) (2σ)
• 720 selectable positions
• LCD display
• Programmable memory function
• Simple operation
• Compact size
• Renishaw autojoint probe mounting
• No special installation required
* Measured at 67 mm (2.64 in) from autojoint (TP6A probe with 21 mm (0.83 in) stylus).
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MIHrecommendations
DO mount the head as rigidly as possible in the CMM quill.
DO ensure that the head is properly locked before attempting to use the probe to take points.
DO support probe/extension set-ups of longer than 150 mm by hand when locking or unlocking the
head.
DO disarm the probe during moves if possible. This can be achieved via the application software and
will avoid false triggers.
DO change the battery when low battery indicator is ON.
DO reposition the head by moving only one axis at a time to ensure best practise.
DO unlock and relock the head after a probe change.
DO NOT rotate the head axes by holding the probe stylus.
DO NOT move the CMM by holding the head.
DO NOT attempt to use a probe whilst the head is unlocked.
DO NOT leave the head unlocked for long periods.
DO NOT use probe extensions over 300 mm long.
DO NOT lock the head in an overtravel position.
DO NOT move the axes beyond overtravel positions.
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MIHmajorcomponents
MIH‐front
Refer to figure opposite.
1 Mounting shank
2 Lock/unlock thumbwheel
3 LCD display
4 Probe status LED
5 LCD memory programming buttons
6 Probe autojoint lock/unlock access window
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7 Renishaw autojoint probe mounting (recessed
into A axis swivel)
8 A axis zero position markers
9 B axis zero position markers
MIH‐back
Refer to figure opposite.
1 Battery housing
2 5-pin DIN connector
3 Serial number
LCDdisplay
Refer to figure opposite.
1 A axis positional data (0° to +105°)
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2 B axis positional data (-180° to +180°)
3 Low battery indicator
4 Head locked symbol
5 Rotation direction arrows
6 Position conf rmation symbol
7 Sequence store indicator
8 Memory mode indicator
9 Memory number
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MIHinstallation
Fittingthebattery
1. Move MIH to axis positions A0.0, B0.0 and lock up.
2. Unscrew housing retaining screw.
3. Open housing door.
4. Insert battery as shown (negative end first).
5. Close door and secure retaining screw (do not overtighten).
6. Reset datum (See ‘
Datum mode’page).
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NOTE: Incorrect insertion of the battery will not cause damage to the MIH.
Fittingtheprobe
1. Offer up the female autojoint with key slot facing as shown.
2. Using an S10 autojoint key, insert into access hole and locate blade in key slot.
3. Rotate clockwise to lock the autojoint.
4. Once qualified, probe/stylus combinations may be interchanged without the need to re-qualify.
5. After changing a probe, unlock and re-lock the head to ensure repeatability.
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Pinconnections
Insert Renishaw 5-pin DIN plug into socket.
1. Head LED cathode
2. Ground
3. Head LED anode
4. Probe circuit
5. Probe circuit
Quillmounting
Ensure that the head is securely mounted onto the CMM quill. Any rotational movement occurring
during use will result in a loss of repeatability of positional data.
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CAUTION: Always fit mounting shanks with the screws supplied (M3 x 5 mm (0.20 in) long). The
use of incorrect screws may cause serious internal damage to the head.
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UsingtheMIH
Unlockingthehead
Both A and B axes are unlocked by a single turn of the thumbwheel in a counter-clockwise direction.
The locked (key) symbol on the LCD will disappear. Probes/extensions longer than 150 mm should be
supported by hand when locking or unlocking the head.
Lockingthehead
To lock the head correctly after positioning, support the probe (and extension, if fitted) and turn the
thumbwheel clockwise until a positive “click” is felt. A correct “lock-up” is confirmed by the appearance
of the key symbol on the LCD. To ensure repeatability, it is important to simply support the
probe/extension during lock-up and NOT to constrain it.
NOTE: Do not leave the head unused in an unlocked position as this will shorten battery life.
Positioningthehead
Rotation of each axis is achieved against a built-in kinematic mechanism. This provides the user with
discreet 7.5° incremental positions so that the head cannot be locked in a non-repeatable position.
The B axis is positioned by holding the lower housing and rotating until the required position is
reached.
The A axis is positioned by holding the probe or extension body as close to the head as possible and
rotating until the required position is reached.
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To ensure maximum repeatability, each axis should be moved separately, and should not be moved
beyond overtravel positions.
CAUTION : Do not change axis positions by holding the stylus, as this will cause damage to the
probe.
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MIHLCD/softwarefacility
A and B axis positional data is shown on an integral liquid crystal display (LCD). When the head is
unlocked and repositioned, position detectors fitted in each axis update the display which will show
live position data. Power for the LCD/software is supplied by a battery fitted within the head which
should be replaced when the low battery indicator is shown. Under normal use, the head will still
function for many days after the low battery indicator appears.
The MIH also has a user-friendly software facility which is operated by two buttons. The software
facility operates in four modes which are entered and exited by button presses and/or time-out
periods of non-use. The locked symbol and low battery indicator function in all modes.
Datummode
This mode has automatic entry when the battery is first fitted or replaced. Datum mode requires the
user to set the A and B axis position detectors to zero and must be completed successfully before the
LCD can be used. Datum mode may also be automatically entered if an error occurs in the axis
position detectors, caused by mis-use of the head. Again, correct datuming of the head must be
completed before use can commence. See Datum mode
for step-by-step instructions.
Simplemode
The software automatically enters simple mode upon completion of the datuming routine. Following
the time-out of other modes, the MIH software will always return the user to simple mode. This is a
use-only mode in which live A and B axis data will always be shown.
In addition, if the head is locked in a position which corresponds to one which has been previously
stored in memory, the memory number will be displayed on lock-up. See Simple mode
step instructions.
for step-by-
Memorymode
The user can enter memory mode from simple mode by pressing either the M+ or M- button. In this
mode the MIH memory can be programmed or used. In memory mode, chosen head positions can be
stored in up to 20 memory stores. Each position is allocated a memory number (0 to 19). In use, a
chosen memory number is selected and direction arrows on the LCD lead the user to rotate the axis
until the position stored in that memory is achieved. If the user fails to achieve the selected position,
this condition is indicated by the flashing of the direction arrows on lock-up. Once the correct position
is reached, the arrows disappear and the head position confi rmation symbol is shown.
Exit from memory mode will occur after a 10 second period of inactivity and the head will revert to
simple mode. A simple button press will return the user to memory mode. See Memory mode
by-step instructions.
for step-
Sequencemode
Sequence mode can be entered by a 5 second press of both M+ and M- buttons from simple mode.
In sequence mode, pre-memorised head positions can be arranged in any order to suit a particular
sequence of inspection. Up to 20 sequence position numbers are available and the sequence can be
edited as required. In use, the direction arrows lead the user through the pre-programmed sequence
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