Mahr Multimar 844 T User manual

Universal Gage
3722483
Mahr GmbH
Standort Esslingen
Reutlinger Str. 48, 73728 Esslingen
Tel. [phone], Fax [phone]
[e-mail], www.mahr.com
1016
Multimar 844 T
Operating Instructions

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Mahr GmbH • Multimar 844 T
Dear valued customer,
Congratulations on choosing a product from Mahr GmbH. Please that you follow these
instructions in order to ensure the long term accuracy of this measuring instrument.
We operate a policy of continuous improvement and are constantly developing our products,
especially with regard to renaming of type designations. It is possible therefore that there may
be slight differences between the text and illustrations in this document and the measuring
instrument in your possession. We reserve the right to make changes to the design and scope
of supply, the right to undertake further technical developments, and all rights relating to
translation of this documentation.
© by Mahr GmbH, Esslingen
The following symbols are used in these operating instructions:
General information
Important information
Attention - Danger
Failure to follow instructions marked with these symbols can cause inaccurate results
and lead to considerable damage to this product!
Introduction
Intended working conditions
The Universal Gage Multimar 844 T is a versatile precision measuring instrument which can
be employed in both production and in inspection areas to measure the following: External
and internal dimensions, External and internal threads, Centering shoulders, Narrow collars,
recesses and grooves, External and internal tapers, External and internal tooth profiles / gears
and much more.
In order to achieve the best use of this measuring instrument it is very important that you first
read these operating instructions!
The scope of supply of the Multimar 844 T includes:
- Multimar 844 T (excludes an indicating instrument)
- Wooden transport box
- 2 wooden vee-blocks (can be used as a secure storage rack or as a practical mounting
aid)
- 4xingscrewsforthemeasuringarms(cheeseheadscrewsM3x8)
- Operating instructions
!

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Mahr GmbH • Multimar 844 T
Safety information
This measuring instrument complies with the relevant safety regulations. It was dispatched
from our production facility in a flawless condition and perfect working order. However, failure
to follow the instructions given below can cause personal injury or death.
1. Before you connect up and use this measuring instrument for the first time, please read
the accompanying documentation (operating instructions).
2. Keep the documentation close to the measuring instrument ready for quick reference.
3. Followallsafetyprecautions,accidentpreventionregulationsandinternalcompanyrules
and guidelines. If necessary you should request further information from your company
safety officer.
4. The Multimar 844T in conjunction with the appropriate indicating instrument and
accessoriesaresubjecttoinspectionequipmentmonitoring.Forthisreason,regular
inspection equipment monitoring performed by either the user or Mahr Service must
ensure compliance to the specified error limits.
Important hints prior to using the Multimar 844T
 Themeasuringinstrumentmayonlybeusedforitsintendedpurpose.Fordamages
caused by other usage or as a result of the incorrect application of this measuring instru-
ment, no liability will be accepted.
Confirmation of traceability
We declare under our sole responsibility that this product is in conformity with standards
and technical data as specified in our sales documents (operating instructions, leaflet,
catalog).
We certify that the measuring equipment used to check this product, and guaranteed by our
Quality Assurance, is traceable to national standards.
Thank you very much for your confidence in purchasing this product.
!

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Mahr GmbH • Multimar 844 T
Contents
1. Description ................................................................................................... 5
2. Switching the direction of the measuring force........................................................ 6
3. Inserting / exchanging the indicating instrument ..................................................... 7
4. Setting up the measuring arm holder ........................................................................ 8
5. Setting with measuring standards (e.g. setting ring, combination
of gage blocks, master, etc.) ....................................................................................... 9
6. Measurement ................................................................................................. 10
7. Technical Data ................................................................................................. 11
8. Accessories ................................................................................................. 12
9. Care and Maintenance ............................................................................................... 14
10. Spare Parts ................................................................................................. 15

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Mahr GmbH • Multimar 844 T
1. Description
1 Holder for the indicating instrument with a clamping screw
2 Handle is heat insulated (protected against hand warmth)
 3 Symbolstoidentifytheselectedmeasuringdirection(Internal/externalmeasurement)
4 Lifting lever
5 Stationary measuring arm holder (adjustable)
6 Moveable arm holder
 7 Fixingscrewsformeasuringarms
8 Clamping screw
9 Hex screw for adjusting the direction of the measuring force
10 Guide tube

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Mahr GmbH • Multimar 844 T
2. Switching the direction of the measuring force
!
To switch the direction of the measuring force; insert a Hex wrench (Allen key) in the bore hole,
which is approximately 100 mm from the lifting lever:
From internal to external measurement
1 Move the lifting lever to the right and hold
2 Insert the Hex wrench into the bore hole (hexagonal screw)
3 TightentheHexscrew(handtightenonly)
From external to internal measurement
4 Insert the Hex wrench into the bore hole when the lifting lever is released
5 Loosen the Hex screw
6 Hold the lifting lever and push back per hand.
Due to the built-in measuring force spring the moveable measuring arm can be moved
very quickly, this may cause damage to the measuring instrument.
Please note:
Loosen the Hex screw with 1 turn in order to avoid contact with the guide tube.

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Mahr GmbH • Multimar 844 T
3. Inserting / exchanging the indicating instrument
- On the indicating instrument holder 1, loosen the clamping screw
- Insert an indicating instrument in the indicating instrument holder 1, take into account the
position of the measuring direction and align the appropriate readout position
- Tighten per hand the clamping screw on the indicating instrument holder 1
Please note:
The Protection bar 844 Tsb offers additional protection damage to the indicating instru-
ment (see Chapter 8, Accessories).

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Mahr GmbH • Multimar 844 T
4. Setting up the measuring arm holder
Both the measuring arm holders (5, 6) must be equipped with the appropriate accessories
according to the measuring task. When used in conjunction with the Adaptor 844 Tad this
instrument is compatible with all the available measuring anvils with a M2.5 thread. In order to
always achieve reliable and accurate measuring results we recommend the use of the Depth
stop 844 Tw. Due to the exact positioning of the stops on the measuring arms it is possible to
ensure pendular motion along a plane parallel. Therefore accurate and continuously accurate
measurements can be guaranteed.

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Mahr GmbH • Multimar 844 T
5. Setting with measuring standards (e.g. setting ring, combination of gage
blocks, master, etc.)
Comparative measurement
- Position the Multimar 844 T on the measuring standard
- With light pendular motion determine the position of the reversal point (Min. and/or Max
value) and here set the indicating instrument to "0".
Absolute measurement
- Enter the PRESET value of the indicating instrument corresponding to the measuring
standard
- Position the Multimar 844 T on the measuring standard
- With light pendular motion determine the position of the reversal point (Min. and/or Max
value) and here set the indicating instrument to the default PRESET value
Please note:
To conduct absolute measurement a digital indicator with a dynamic measuring function
and a PRESET is required. The following indicating instruments are recommended:
Model Range Product Types
Digital Indicators MarCator 1087 BR, 1087 BRi

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Mahr GmbH • Multimar 844 T
6. Measurement
- Move the moveable
measuring arm holder 6
with the lifting lever 4
- Bring the 844 T in to the
position of measurement
- Release the lifter lever
4so that the moveable
measuring arm holder 6
so that there is contact
on the work piece, the
constant measuring force
is automatic
- Determine the reversal
point (Min and/or Max
value) with pendular
motion
- Read off the measuring
result on the indicating
instrument

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Mahr GmbH • Multimar 844 T
*To ensure the maximum application range, the insulated handle between both measuring arm holders must
beremoved.Inadditiontheinsulatedhandleandthexedmeasuringarmholdermustberemovedfrom the guide tube, reassembly in the reverse order
Attention! Inordertopreventdamagetotheguidetube,itisimperativethatwhenxingthetheinsulatedhandlethat the screws in the groove of the guide tube are submerged. To extend of the application range, the measuring elements are rotated through 180°. The application ranges can deviate depending upon measuring anvils
7. Technical Data
Application
range
internal
mm
Application
range
internal
extended
mm
Application
range
external
mm
Application
range
external
extended
mm
Measuring
range
moveable
probe
mm
Measuring
force
N
Order no.
30 -115 110 - 195 0 - 85 75 - 165 12 5 4503001
110 - 265 190 - 345 80 - 235 160 - 315 12 5 4503002
260 - 615* 340 - 695 230 - 585* 310 - 665 12 5 4503003
610 - 1015* 690 - 1095 580 - 985* 660 - 1065 12 5 4503004
1000 - 1500* 1080 - 1580 970 - 1470* 1050 - 1550 12 10 4503005 1500 - 2000* 1580 - 2080 1470 - 1970* 1550 - 2050 12 10 4503006 2000 - 2500* 2080 - 2580 1970 - 2470* 2050 - 2550 12 10 4503007 2500 - 3000 2580 - 3080 2470 - 2970 2550 - 3050 12 10 4503008 3000 -3500 3080 -3580 2970 - 3470 3050 -3550 12 10 4503009 3500 - 4000 3580 - 4080 3470 -3970 3550 - 4050 12 10 4503010 4000 - 4500 4080 - 4580 3970 - 4470 4040 - 4550 12 10 4503011
All dimensions are in mm

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Mahr GmbH • Multimar 844 T
8. Accessories
By rotating the measuring arms the application range can be extended.
Measuring Arms 844 Te and Depth Stops 844 Tw
In combination with Measuring anvils 844 Tp, 844 Ts, 844 Tk, 844 Tr, 844 Tg
In combination with Adaptor 844 Tad and Measuring anvils 901 H - 912
844 Te
844 Tad
901 H
902 H
903 H
904 H
906 H
907
908 H
911 H
912
844 Tp
844 Ts
844 Tk
844 Tr
844 Tg
844 Tw

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Mahr GmbH • Multimar 844 T
844 Tmi
844 Tc 844 Td844 Tb
844 Tma
Measuring Arms 844 Tma and Depth Stops 844 Tw
In combination with Measuring anvils: 844 Ta, 844 Tb, 844 Tc, 844 Td
Measuring Arms 844 Tmi and Depth Stops 844 Tw
In combination with Measuring anvils: 844 Ti, 844 Tb, 844 Tc, 844 Td
844 Tv
844 Tw
844 Tz
844 Ta 844 Ti 25 Eba

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Mahr GmbH • Multimar 844 T
9. Care and Maintenance
Accumulation of dirt on the measuring faces can impair the measuring results; therefore the
measuring faces must be kept clean of dirt, dust and other contamination.
After being used, the measurement instrument should be cleaned with a dry, soft cloth.
Remove heavy soiling with a cloth wetted with a neutral solvent. Volatile organic solvents like
thinners are not to be used, as these liquids can damage the individual components.
Should you have any questions regarding the instrument, contact us and we shall be pleased
to answer them.
Measuring Arms 844 Ty
In combination with Measuring Anvil: 706 Vr and Holder 844 Tf
Protection Bar 844 Tsb
To protect the indicator against impacts or damage when laying down the measuring instru-
ment.
844 Tsb
844 Ty
706 Vr
844 Tf

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Mahr GmbH • Multimar 844 T
Pos. Order no. Contents
(P.U.)
Description for basic unit
14503267-E 1 Dial Indicator holder all
24503214-E 1 Milled screw M4x11 all
3 4503012 1 Protection bar all
44503116-E 1 Insulating handle 1 all
54879663-E 4HexagonsocketscrewM3x8 all
64503212-E 1 Milled screw M5x20 all
74503269-E 1 Insulating handle 2 4503001,4503002
84503117-E 1Insulatinghandle3 4503003-4503011
94503206-E 1 Lifting handle all
10 4503216 2 Storage rack all
10. Spare Parts

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Mahr GmbH • Multimar 844 T