ISO/IEC 18836:2001

INTERNATIONAL ISO/IEC
STANDARD 18836
First edition
2001-02-15
Information technology — 8 mm wide
magnetic tape cartridge for information
interchange — Helical scan recording —
MammothTape-2 format
Technologies de l'information — Cartouche de bande magnétique de 8mm
de large pour l'échange d'information — Enregistrement par balayage en
spirale — Format «MammothTape-2»
Reference number
ISO/IEC 18836:2001(E)
©
ISO/IEC 2001

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ISO/IEC 18836:2001(E)
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ISO/IEC 18836:2001(E)
Contents
Section 1 - General 1
1 Scope 1
2 Conformance 1
2.1 Magnetic tape cartridges 1
2.2 Generating drive 1
2.3 Receiving drive 1
3 References 1
4 Definitions 1
4.1 a.c. erase 1
4.2 algorithm 1
4.3 Average Signal Amplitude 1
4.4 azimuth 2
4.5 back surface 2
4.6 bit cell 2
4.7 byte 2
4.8 cartridge 2
4.9 Channel bit 2
4.10 Cyclic Redundancy Check (CRC) character 2
4.11 Error Correcting Code (ECC) 2
4.12 File Mark 2
4.13 Logical Beginning of Partition (LBOP) 2
4.14 Logical Block 2
4.15 magnetic tape 2
4.16 Master Standard Reference Tape 2
4.17 Partition 2
4.18 Physical Beginning of Partition (PBOP) 2
4.19 Physical Beginning of Tape (PBOT) 2
4.20 Physical End of Partition (PEOP) 2
4.21 Physical End of Tape (PEOT) 2
4.22 physical recording density 2
4.23 Read Back Check (RBC) 2
4.24 Reference Field 2
4.25 Secondary Standard Reference Tape (SSRT) 2
4.26 Set Mark 2
4.27 Standard Reference Amplitude (SRA) 2
4.28 Standard Reference Current (Ir) 2
4.29 Tape Reference Edge 2
4.30 Test Recording Current (TRC) 2
4.31 Track 3
4.32 Typical Field 3
5 Conventions and Notations 3
5.1 Representation of numbers 3
5.2 Names 3
6 Acronyms 3
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ISO/IEC 18836:2001(E)
7 Environment and Safety 4
7.1 Testing environment 4
7.2 Operating environment 4
7.3 Storage environment 4
7.4 Transportation 4
7.5 Safety 4
7.6 Flammability 4
Section 2 - Requirements for the case 5
8 Dimensional and mechanical characteristics of the case 5
8.1 General 5
8.2 Overall dimension 5
8.3 Holding areas 6
8.4 Cartridge insertion 6
8.5 Window 7
8.6 Loading grips 7
8.7 Label areas 7
8.8 Datum areas and datum holes 7
8.9 Support areas 8
8.10 Recognition holes 9
8.11 Write-inhibit hole 9
8.12 Pre-positioning surfaces 10
8.13 Cartridge lid 10
8.14 Cartridge reel lock 11
8.15 Reel access holes 12
8.16 Interface between the reels and the drive spindles 12
8.17 Light path 14
8.18 Position of the tape in the case 14
8.19 Tape path zone 14
8.20 Tape access cavity 15
8.21 Tape access cavity clearance requirements 15
Section 3 - Requirements for the Unrecorded Tape 32
9 Mechanical, physical and dimensional characteristics of the tape 32
9.1 Materials 32
9.2 Tape length 32
9.2.1 Length of the magnetic tape 32
9.2.2 Length of leader and trailer tapes 32
9.2.3 Length of the cleaning tape 32
9.2.4 Length of the splicing tape 32
9.3 Width 32
9.3.1 Width of magnetic, cleaning, leader and trailer tape 32
9.3.2 Width and position of the splicing tape 33
9.3.3 Edge weave 33
9.4 Discontinuities 34
9.5 Thickness 34
9.5.1 Thickness of the magnetic tape 34
9.5.2 Thickness of the cleaning tape 34
9.5.3 Thickness of leader and trailer tape 34
9.5.4 Thickness of the splice tape 35
9.6 Longitudinal curvature 35
9.7 Cupping 35
9.8 Coating adhesion 35
9.9 Layer-to-layer adhesion 36
9.10 Tensile strength 36
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ISO/IEC 18836:2001(E)
9.10.1 Breaking strength 36
9.10.2 Yield strength 36
9.11 Residual elongation 36
9.12 Electrical resistance of the recording surface 36
9.13 Tape winding 37
9.14 Light transmittance of tape 37
9.15 Abrasivity 37
10 Magnetic recording characteristics 37
10.1 Test conditions 37
10.2 Typical Field 37
10.3 Signal Amplitude 38
10.4 Resolution 38
10.5 Signal-to-Noise Ratio 38
10.6 Ease of erasure 39
10.7 Tape quality 39
10.7.1 Missing pulses 39
10.7.2 Missing pulse zone 39
10.7.3 Overwrite 39
Section 4 - Requirements for an Interchanged Tape 40
11 Track Format 40
11.1 General 40
11.2 Physical block format 41
11.2.1 Logical Transfer Segment (LTS) 41
11.2.2 Compression Unit 42
11.2.3 Physical block 43
11.2.4 Information Matrix 50
11.2.5 Recorded patterns 51
11.3 Search field format 51
11.3.1 Search field data 51
11.3.2 Search field CRC and ECC 53
11.3.3 Search field recording patterns 53
11.4 Servo area 53
11.5 Track layout 53
12 Method of recording 56
12.1 Physical Recording Density 56
12.1.1 Long Term Average Bit Cell Length 56
12.1.2 ShortTermAverage BitCellLength 56
12.1.3 Rate of Change 56
12.2 Bit Shift 57
12.3 Amplitude of Data Signals 57
13 Track geometry 57
13.1 General 57
13.2 Track pitch 57
13.3 Average track pitch 57
13.4 Track width 57
13.5 Track angle 58
13.6 Track length 58
13.7 Guard band 58
13.8 Azimuth angles 58
13.9 Track linearity 58
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ISO/IEC 18836:2001(E)
14 Layout of a tape 58
14.1 General 58
14.2 Tape History Log (THL) 58
14.3 Physical Beginning of Partition 59
14.4 Logical Beginning of Partition 59
14.5 Data area 59
14.5.1 General 59
14.5.2 Short File Mark 59
14.5.3 Long File Mark 59
14.5.4 Set Mark 59
14.6 End of Data 59
14.7 Physical End of Partition (PEOP) 59
Annexes
A (normative) - Measurement of Light Transmittance of Tape and Leaders 60
B (normative) - Tape abrasivity measurement procedure 63
C (normative) - Generation of the Logical Block CRC 65
D (normative) - ECC3 Check Bytes 66
E (normative) - Generation of the Data Area CRC 67
F (normative) - Generation of the ECC 68
G (normative) - Pre-coder 69
H (normative) - Representation of 8-bit bytes by 10-bit patterns 70
J (normative) - Randomisation 77
K (normative) - Generation of the Search Field CRC 78
L (normative) - The Search Field ECC 79
M (normative) - Measurement of bit shift 80
N (informative) - Recommendations for transportation 82
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ISO/IEC 18836:2001(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the
specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights.
ISO and IEC shall not be held responsible for identifying any or all such patent rights.
This International Standard was prepared by ECMA (as ECMA-293) and was adopted, under a special “fast-track procedure”,
by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO
and IEC.
Annexes A to M form a normative part of this International Standard. Annex N is for information only.
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INTERNATIONAL STANDARD ISO/IEC 18836:2001(E)
Information technology - 8 mm wide magnetic tape cartridge for information
interchange - Helical scan recording - MammothTape-2 format
Section 1 - General
1Scope
This International Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tape cartridge to
enable physical interchange of such cartridges between drives. It also specifies the quality of the recorded signals, the
recording method and the recorded format called MammothTape-2, and thereby allowing data interchange between drives by
means of such magnetic tape cartridges.
Information interchange between systems also requires, at a minimum, agreement between the interchange parties upon the
interchange code(s) and the specifications of the structure and labelling of the information on the interchanged cartridge.
2 Conformance
2.1 Magnetic tape cartridges
A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of
this International Standard throughout the extent of the tape.
2.2 Generating drive
A drive generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International
Standard if all the recordings that it makes on a tape meet the mandatory requirements of this International Standard. A claim
of conformance shall state whether or not one or more registered compression algorithm(s) are implemented within the system
to process data from the host prior to allocating data to physical blocks.
2.3 Receiving drive
A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with the International
Standard if it is able to handle any recording on this tape according to this International Standard. A receiving drive shall be
able to recognise the use of a data compression algorithm and make the algorithm registration number available to the host.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this
International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the
normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
IEC 60950:1999 Safety of information technology equipment.
ISO 527-3:1995 Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets.
ISO 1302:1992 Technical Drawings - Method of indicating surface texture.
ISO/IEC 11576:1994 Information technology - Procedure for the registration of algorithms for the lossless compression of
data.
ISO/IEC 15200:1996 Information technology - Adaptive Lossless Data Compression algorithm (ALDC).
4 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
4.1 a.c. erase: A process of erasure utilising alternating magnetic fields of decaying intensity.
4.2 algorithm: A set of rules for transforming the logical representation of data.
4.3 Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at a density of
3 704 ftpmm measured over a distance of 3000 mm, exclusive of missing pulses.
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ISO/IEC 18836:2001(E)
4.4 azimuth: The angular deviation, in degrees of arc, of the recorded flux transitions on a track from a line normal to the
track centreline.
4.5 back surface: The surface of the tape opposite to the magnetic coating used to record data.
4.6 bit cell: A distance along the track allocated for the recording of a Channel bit.
4.7 byte: An ordered set of bits acted upon as a unit.
4.8 cartridge: A case containing magnetic tape stored on twin reels.
4.9 Channel bit: A bit after 8-10 transformation.
4.10 Cyclic Redundancy Check (CRC) character: A character derived from information contained in data bytes that
is used for error detection.
4.11 Error Correcting Code (ECC): A mathematical procedure yielding bytes used for the detection and correction of
errors.
4.12 File Mark: A mark recorded on the tape at the request of the host system to separate files or to provide an append
point. This format provides for Long or Short File Marks.
4.13 Logical Beginning of Partition (LBOP): The point in a partition where a recording of data for interchange
commences.
4.14 Logical Block: Information (data, file marks, or set marks) sent to the tape drive to be recorded.
4.15 magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage of data for
information processing.
4.16 Master Standard Reference Tape: A tape selected as the standard for Signal Amplitude, Typical Field,
Overwrite and Resolution.
Note - The Master Standard Reference Tape has been established by Pericomp Corporation.
4.17 Partition: Aformattedlengthoftapeusedtorecorddata.
4.18 Physical Beginning of Partition (PBOP): The point along the length of tape at which a partition begins.
4.19 Physical Beginning of Tape (PBOT): The transition from the tape leader to an opaque area of the splice by which
a translucent leader tape is joined to the magnetic tape.
4.20 Physical End of Partition (PEOP): The point along the length of tape at which a partition ends.
4.21 Physical End of Tape (PEOT): The transition from an opaque area of the splice to a translucent trailer tape.
4.22 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.23 Read Back Check (RBC): A Read Back Check occurs when, while writing, the data is read by trailing heads and
checked for errors.
4.24 Reference Field: The Typical Field of the Master Standard Reference Tape.
4.25 Secondary Standard Reference Tape (SSRT): A tape the performance of which is known and stated in relation
to that of the Master Standard Reference Tape.
Note - Secondary Standard Reference Tapes can be ordered under the Part Number SSRT/M.AME/PC97, from Pericomp Corporation, 14
Huron Drive, Natick, MA 01760, USA.
In principle, such tapes will be available for a period of 10 years from the publication of the first edition of this International Standard.
However, by agreement between ISO/IEC and Pericomp, this period may be shortened or extended to take account of demand for such tapes.
It is intended that these be used for calibrating Tertiary Reference Tapes for use in routine calibration.
4.26 Set Mark: A mark recorded on the tape at the request of the host system to separate a set of data or to provide an
append point.
4.27 Standard Reference Amplitude (SRA): The Average Signal Amplitude derived from the Master Standard
Reference Tape, using the Test Recording Current at 3 704 ftpmm.
4.28 Standard Reference Current (Ir): The current that produces the Reference Field.
4.29 Tape Reference Edge: The lower edge of tape as seen when viewing the recording surface of the tape with the
supply reel to the observer’sright.
4.30 Test Recording Current (TRC): The current used to record the SRA. The TRC is 1,5 times the Standard
Reference Current.
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ISO/IEC 18836:2001(E)
4.31 Track: A diagonally positioned area on the tape along which a series of magnetic transitions may be recorded.
4.32 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the physical recording
density of 3 704 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 90% of the maximum
Average Signal Amplitude.
5 Conventions and Notations
5.1 Representation of numbers
A measured value is rounded off to the least significant digit of the corresponding specified value. It implies that a specific
value of 1,26 with a positive tolerance of +0,01, and a negative tolerance of -0,02 allows a range of measured values from
1,235 to 1,275.
� Letters and digits in parentheses represent numbers in hexadecimal notation.
� The setting of a bit is denoted by ZERO or ONE.
� Numbers in binary notation and bit combinations are represented by strings of digits 0 and 1.
� Numbers in binary notation and bit combinations are shown with the most significant byte to the left, and with the most
significant bit in each byte to the left.
� Negative values of numbers in binary notation are given in Two’s complement.
� In each field the data is processed so that the most significant byte (byte 0) is processed first. Within each byte the most
significant bit (numbered 7 in an 8-bit byte) is processed first, least significant bit is numbered 0 and is processed last. This
order of processing applies also to the data input to the Error Detection and Correction circuits and to their output, unless
otherwise stated.
5.2 Names
The names of entities, e.g. specific tracks, fields, etc., are given with a capital initial.
6 Acronyms
ABID Augmentative Block Identifier
BID Block Identifier
CRC Cyclic Redundancy Check
CUH Compression Unit Header
CUID Compression Unit Identifier
ECC Error Correction Code
EOD End of Data
FID File Identifier
LBOP Logical Beginning of Partition
LID Logical Block Identifier
lsb Least Significant Bit
LSB Least Significant Byte
LTS Logical Transfer Segment
msb Most Significant Bit
MSB Most significant Byte
PBOP Physical Beginning of Partition
PBOT Physical Beginning of Tape
PEOP Physical End of Partition
PEOT Physical End of Tape
PID Physical Identifier
RBC Read Back Check
SID Stream Identifier
SMID Set Mark Identifier
SRA Standard Reference Amplitude
SSRT Secondary Standard Reference Tape
THL Tape History Log
TRC Test Recording Current
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ISO/IEC 18836:2001(E)
7 Environment and Safety
The conditions specified below refer to the ambient conditions immediately surrounding the cartridge.
Cartridges exposed to environments outside these limits may still be able to function usefully; however, such exposure may
cause permanent damage.
7.1 Testing environment
Unless otherwise specified, tests and measurements made on the cartridge to check the requirements of this International
Standard shall be carried out under the following conditions
temperature: 23�C� 2�C
relative humidity: 40 % to 60 %
conditioning period before testing: 24 h min.
7.2 Operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions
temperature: 5�Cto 45�C
relative humidity: 20 % to 80 %
wet bulb temperature: 26�Cmax.
The average temperature of the air immediately surrounding the tape shall not exceed 45�C.
If a cartridge has been exposed during storage and/or transportation to conditions outside the above values, before use the
cartridge shall be conditioned in the operating environment for a time at least equal to the period during which it has been out
of the operating environment, up to a maximum of 24 h.
7.3 Storage environment
The following conditions shall be observed during storage
temperature: 5�Cto 32�C
relative humidity: 20 % to 60 %
stray magnetic field: shall not exceed 4 000 A/m at any point on the tape.
There shall be no deposit of moisture on or in the cartridge.
7.4 Transportation
Recommended limits for the environments, to which a cartridge may be subjected during transportation, and the precautions to
be taken to minimise the possibility of damage, are provided in annex N.
7.5 Safety
The cartridge shall satisfy the safety requirements of IEC 60950 when used in the intended manner or in any foreseeable use in
an information processing system.
7.6 Flammability
The cartridge shall be made from materials that comply with the flammability class for HB materials, or better, as specified in
IEC 60950.
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ISO/IEC 18836:2001(E)
Section 2 - Requirements for the case
8 Dimensional and mechanical characteristics of the case
8.1 General
The cartridge shall consist of the following elements:
� a case
� recognition holes
� a write inhibit mechanism
� twin reels containing magnetic tape
� a locking mechanism for the reels
Dimensional characteristics are specified for those parameters deemed to be mandatory for interchange and compatible use of
the cartridge. Where there is freedom of design, only the functional characteristics of the elements described are indicated. In
the figures a typical implementation is represented in third angle projections.
Figure 1 shows a perspective view of the cartridge seen from the top.
Figure 2 shows a perspective view of the cartridge seen from the bottom.
Figure 3 shows a perspective view of Reference Planes X, Y and Z.
Figure 4 shows the front side with the lid closed.
Figure 5 shows the left side with the lid closed.
Figure 6 shows the top side with the lid closed.
Figure 7 shows the right side with the lid closed.
Figure 8 shows the rear side with the lid closed.
Figure 9 shows the bottom side, datum and support areas.
Figure 10 shows the bottom side with the lid removed.
Figure 11 shows the enlarged view of the datum and recognition holes.
Figure 12 shows cross-sections through the light path holes, the recognition holes and the write-inhibit hole.
Figure 13 shows details of the lid when closed, rotating and open.
Figure 14 shows details of the lid release insertion channel.
Figure 15 shows the lid lock release requirements.
Figure 16 shows the reel lock release requirements.
Figure 17 shows the reel unlock force direction.
Figure 18 shows the lid release force direction.
Figure 19 shows the lid opening force direction.
Figure 20 shows the light path and light window.
Figure 21 shows the internal tape path and light path.
Figure 22 shows the cartridge reel and a cross-section view of the cartridge reel.
Figure 23 shows a cross-section view of the cartridge reel interface with the drive spindle.
Figure 24 shows the tape access cavity clearance requirements.
The dimensions are referred to three orthogonal Reference Planes X, Y and Z (see figure 3).
Plane X is perpendicular to Plane Z and passes through the centres of the Datum Holes A and B.
Plane Y is perpendicular to Plane X and Plane Z and passes through the centre of Datum Hole A.
Datum area A, B and C shall lie in Plane Z.
8.2 Overall dimension (figures 5 and 6)
The length of the case shall be
l =62,5mm� 0,3 mm
1
The width of the case shall be
l =95,0mm� 0,2 mm
2
The distance from the top of the case to Plane Z shall be
l =15,0mm� 0,2 mm
3
The distance from the rear side to Plane X shall be
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ISO/IEC 18836:2001(E)
l =47,35 mm� 0,15 mm
4
The distance from the right side to Plane Y shall be
l =13,0mm� 0,1 mm
5
8.3 Holding areas
The holding areas shown hatched in figure 6 shall be the areas along which the cartridge shall be held down when inserted into
the drive. The distance of the holding areas from Plane X shall be
l =12,0mmmax.
6
The width when measured from the edge of the case shall be
l = 3,0 mm min.
7
8.4 Cartridge insertion
The cartridge shall have asymmetrical features to prevent insertion into the drive in other than the correct orientation. These
consist of an insertion channel, a recess and an incline.
The insertion channel (figures 4 and 14) shall provide for an unobstructed path, when the lid is closed and locked, to unlock the
lid. The distance of the insertion channel from Plane Y shall be
l =79,7mm� 0,2 mm
8
There shall be a chamfer at the beginning of the insertion channel defined by
l =1,0 mm� 0,1 mm
9
l =1,5 mm� 0,1 mm
16
An additional chamfer further into the insertion channel shall be defined by
l =0,7 mm� 0,1 mm
10
l =1,0 mm� 0,1 mm
17
l =3,8 mm� 0,1 mm
18
The innermost width of the insertion channel shall be
l = 1,0 mm min.
11
The thickness of the lid shall be
l =1,2 mm� 0,1 mm
12
Thereshallbeachamfer onthelid definedby
l =0,8 mm� 0,1 mm
13
l =1,2 mm� 0,1 mm
14
The lid shall extend from the case a distance of
l =0,5 mm� 0,1 mm
15
The distance from the left side of the case to the lid lock shall be
l =0,2 mm� 0,2 mm
19
The height of the insertion area shall be
l = 2,3 mm min.
20
l =2,5 mm� 0,2 mm
21
The recess is located on the right side of the cartridge. The position and dimensions (figures 5, 7 and 10) shall be defined by
l = 7,5 mm max.
22
l = 11,0 mm� 0,2 mm
23
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ISO/IEC 18836:2001(E)
l =1,5 mm� 0,1 mm
24
The depth of the recess shall be
l =1,5 mm� 0,1 mm
25
The incline (figure 13a) is part of the lid structure. The distance of the incline from Plane X shall be defined by
+0,0mm
l =7,7 mm
26
-2,5 mm
The angle of the incline shall be
o o
a =20 � 1
1
The incline shall end when it intersects the radius r (see clause 8.13).
3
8.5 Window (figure 1)
A window may be provided on the top side so that parts of the reels are visible. The window, if provided, shall not extend
beyond the height of the cartridge.
8.6 Loading grips (figures 5 and 7)
The cartridge shall have recessed loading grips on each side to aid an automatic loading mechanism.
The distance from Plane X to the centreline of the loading grip shall be
l = 39,35 mm� 0,20 mm;
28
The distance from Plane Z on the bottom side and from the top side shall be
l =1,5 mm� 0,1 mm;
29
The width of the indent shall be
l =5,0 mm� 0,3 mm;
30
The depth of the indent shall be
l =2,0 mm� 0,2 mm;
31
and the angle of the indent
o o
a =90 � 5 .
2
8.7 Label areas (figures 6 and 8)
A portion of the rear side of the cartridge and a portion of the top side of the cartridge may be used for labels. The position and
the size of the labels shall not interfere with the operation or clearance requirements of the cartridge component parts.
The area used for labels on the top side shall not extend beyond the inner edge of the holding areas defined by l and l .
6 7
The position and dimensions of the label area on the rear side shall be defined by
l = 0,5 mm min.
32
l = 1,5 mm min.
33
l = 80,0 mm max.
34
The depth of the top side label area shall be 0,3 mm max. The depth of the rear side label area shall be 0,30 mm� 0,05 mm.
8.8 Datum areas and datum holes
The annular datum areas A, B and C shall lie in Plane Z (see figures 9, 10 and 11). They determine the vertical position of the
cartridge in the drive. Each shall have a diameter d equal to 6,0 mm � 0,1 mm and be concentric with the respective datum
1
hole.
The centres of datum holes A and B lie in Plane X.
The centre of the circular datum hole A shall be at the intersection of planes X and Y (see figure 10).
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ISO/IEC 18836:2001(E)
The distance from the centre of datum hole B to Plane Y (see figure 9) shall be
l = 68,0 mm� 0,1 mm
35
The distance from the centre of the circular datum hole C to Plane Y (see figure 11) shall be
l = 10,20 mm� 0,05 mm
36
The distance from the centre of datum hole D to Plane Y (see figure 11) shall be
l = 79,2 mm� 0,1 mm
37
The distance from the centres of datum holes C and D to Plane X (see figure 10) shall be
l = 36,35 mm� 0,08 mm
38
The thickness of the case in the datum areas shall be
l =1,2 mm��0,1 mm
39
The diameter at the bottom of datum hole A and datum hole C shall be
l = 2,6 mm min.
40
The depth of the holes shall be
l = 4,0 mm min.
42
The upper diameter of datum holes A and C shall be
+0,05mm
l =3,00 mm
44
-0,00mm
This diameter shall be to a depth of
l = 1,5 mm min.
41
There shall be a chamfer around the outside of datum hole A and datum hole C defined by
l = 0,3 mm max.
43
o o
a =45 � 1
3
The width at the bottom of datum holes B and D shall be l .
40
The depth of the holes shall be l .
42
The dimensions at the top of the holes shall be
l =3,5 mm� 0,1 mm
45
l =3,00 mm� 0,05 mm
46
r =1,75mm� 0,05 mm
1
This width shall be to a depth l .
41
There shall be a chamfer around the outside of datum holes B and D defined by l and a .
43 3
8.9 Support areas (figure 9)
The cartridge Support areas are shown shaded in figure 9. Support areas A’,B’ and C’ shall be coplanar with Datum areas A, B
and C, respectively, within 0,1 mm. Support area D’ shall be coplanar with
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