Mahr Multimar 844 S User manual

Setting instrument
3722643
Mahr GmbH
Standort Esslingen
Reutlinger Str. 48, 73728 Esslingen, Germany
Tel. [phone], Fax [phone]
[e-mail], www.mahr.de
1116
Multimar 844 S
Operating instructions

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Mahr GmbH • Multimar 844 S
Dear customer,
Thank you for choosing a product by Mahr GmbH. We kindly request that you follow the
instructions below to ensure the long-term precision of your instrument.
We operate a policy of continuous improvement and are constantly developing our products.
Therefore, it is possible that there may be slight differences between the text and illustrations
in this document and the instrument in your possession, especially with regard to type
designations. 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, Germany
The following symbols are used in these operating instructions:
General information
Caution
Caution, hazard
Failure to follow instructions marked with this symbol may lead to inaccurate results
and cause damage to equipment.
1. Introduction
Intended use
The 844 S setting instrument is used to adjust the length measurements in production, quality
control and in the workshop.
Intended use is subject to compliance with all published information relating to this product.
Any other use is not in accordance with the intended use. The manufacturer accepts no liability
for damages resulting from improper use. All statutory and other regulations and guidelines
applicable to the area of use must be observed.
The operating, maintenance and repair information detailed in these operating instructions
must be followed.
To get the most out of this measuring instrument, you should read the operating instructions
prior to commissioning the instrument.
2. Delivery of the 844 S setting instrument includes:
- Light alloy bar with gage block holder
- Operating instructions
!

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Mahr GmbH • Multimar 844 S
Confirmation of traceability
We declare, with sole responsibility, that this product conforms to the standards
and technical data as specified in our sales documents (operating instructions,
leaflet, catalog).
We certify that the testing equipment used to check this product, and guaranteed by
our quality assurance system, is traceable to national standards.
Thank you for placing your trust in us by purchasing this product.
3. Important information prior to commissioning the setting instrument
• To guarantee your setting instrument for extended use, use a dry cloth to remove any dirt
from the instrument following use. Then use oil to preserve the metal clamping elements.
• Use a soft, dry cloth to clean dirty instrument following use. Wipe the instrument with a
damp cloth if it is extremely dirty. Avoid volatile organic solvents such as thinners as these
liquids may damage the device.
• Warranty claims are void if the device is dismantled.
We wish you all the best with your new setting instrument. Please do not hesitate to contact
our technical consultants should you have any questions.

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Mahr GmbH • Multimar 844 S
4. Practical use
Used to adjust inner and outer comparative measuring instruments such as Multimar 844 T
and Marameter 844 N to a nominal size. Gage blocks are used to set a highly precise
dimensional reference.
Type Application range Dimensions light alloy
base bar
Order no.
844 S 0 – 400 mm 520 x 80 x 40 mm 4503500
844 S 0 – 1150 mm 1270 x 80 x 40 mm 4503501
844 S 0 – 2180 mm 2300 x 80 x 80 mm 4503502
5. Technical data 844 S

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Mahr GmbH • Multimar 844 S
1
2
3
4
89
6
5
7
Partial description:
1Fixed gage block clamping element
2Mobile gage block clamping element
3Clamping lever
4Tension lever for eccentric clamp
5Gage block holder
6Movable gage block clamping unit
7Light alloy bar with adjustable feet
8Removable cover plate
9 Threadedbores(lightalloyprole)toattachthebaseplateforverticaluse

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Mahr GmbH • Multimar 844 S
6. Accessories
Suitable for Type Figure
Description Dimensions Use for: Quantity
unit
Order no.
Multimar 844 T
Multimar 25 EWR
844 Sp
T-parallel jaw to position
and precisely set the
Multimar for outer and inner
dimensions
Width 20.000 mm ±1 µm
Height 75 mm
Contact area 32 mm
Measuring
arm pairs
844 Tma, 844 Tmi,
844 Tms,
844 Te with 844 Tw
Pair 4503510
844 Sph
Spacers to raise the
T-parallel jaw when using
long measuring arms 844
Te, 844 Tms
Height 30 mm
Contact area 32 mm
Long measuring
arm pairs 844 Te
Required
quantity:
844 Te
L 70 mm = 1 pair
844 Te, 844 Tms
L 100 mm = 2 pairs
Pair 4503511
MaraMeter 844 N 844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 70 x 12 mm 844 N Measuring
range 18 - 250 mm
Unit 4474080
844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 165 x 17 mm 844 N Measuring
range 18 - 400 mm
Unit 4474081
844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 320 x 20 mm 844 N Measuring
range 18 - 800 mm
Unit 4474082
844 em
Flat measuring jaw to
supportthexedmeasuring
pin of the 844 T
L x W x H 60 x 9 x 9.5 mm 844 N Measuring
range 18 - 800 mm
Unit 4470095
Multimar 844 T
MaraMeter 844 N
844 Sf
Heavy steel base plate, to
adjust the vertical position
of the 844 S setting
instrument
L x W x H 200 x 200 x 25 mm
Weight 7.5 kg
844 S, 4503500
0 - 400 mm
844 S, 4503501
0 - 1150 mm
Unit 4503512

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Mahr GmbH • Multimar 844 S
Suitable for Type Figure
Description Dimensions Use for: Quantity
unit
Order no.
Multimar 844 T
Multimar 25 EWR
844 Sp
T-parallel jaw to position
and precisely set the
Multimar for outer and inner
dimensions
Width 20.000 mm ±1 µm
Height 75 mm
Contact area 32 mm
Measuring
arm pairs
844 Tma, 844 Tmi,
844 Tms,
844 Te with 844 Tw
Pair 4503510
844 Sph
Spacers to raise the
T-parallel jaw when using
long measuring arms 844
Te, 844 Tms
Height 30 mm
Contact area 32 mm
Long measuring
arm pairs 844 Te
Required
quantity:
844 Te
L 70 mm = 1 pair
844 Te, 844 Tms
L 100 mm = 2 pairs
Pair 4503511
MaraMeter 844 N 844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 70 x 12 mm 844 N Measuring
range 18 - 250 mm
Unit 4474080
844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 165 x 17 mm 844 N Measuring
range 18 - 400 mm
Unit 4474081
844 Neb
Setting bridge to support
the 844 N centering bridge
L x W 320 x 20 mm 844 N Measuring
range 18 - 800 mm
Unit 4474082
844 em
Flat measuring jaw to
supportthexedmeasuring
pin of the 844 T
L x W x H 60 x 9 x 9.5 mm 844 N Measuring
range 18 - 800 mm
Unit 4470095
Multimar 844 T
MaraMeter 844 N
844 Sf
Heavy steel base plate, to
adjust the vertical position
of the 844 S setting
instrument
L x W x H 200 x 200 x 25 mm
Weight 7.5 kg
844 S, 4503500
0 - 400 mm
844 S, 4503501
0 - 1150 mm
Unit 4503512

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Mahr GmbH • Multimar 844 S
4
1
10
A
10
25
7. Setup of the 844 S setting instrument using the example of a Multimar 844 T:
7.1 Insert the parallel jaws10 and gage block combination A into the gage block holder 5
between the two clamping elements 1and 2
7.2 Put the tension lever for the eccentric clamp 4in the middle position to pull back the
mobile gage block clamping element

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Mahr GmbH • Multimar 844 S
4
3
7.4 Brace the parallel jaw/gage block combination securely by tightening the eccentric clamp
using the tension lever 4
7.3 Apply the clamping unit and clamps using the clamping lever on the side 3

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Mahr GmbH • Multimar 844 S
Lo
Li
10
A
20 20
10
8. Setting dimensional references
8.1 Setup for a Multimar 844 T
Required accessories:
- 844 Sp parallel jaw 10 in T-shape
- Gage block combination A(inaccordancewiththereferencedimension)
- 844 Sph Spacers 11 (forlongjawsstartingat70mm)
- 844 Sf Base plate 12 forverticaluse(ifnecessary)
Handle the 844 Sf base plate carefully due to its heavy weight (7.5 kg)!
We recommend using the included table clamps to attach the base plate to the
measuring station.
Setting up a dimensional reference Lo for outer measurement:
DimensionalreferenceLo=gageblockcombination(Li)+844Sp(2x20mm)
Setting up a dimensional reference Li for inner measurement:
Dimensional reference Li = gage block combination between T-parallel jaws

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Mahr GmbH • Multimar 844 S
12
11 11

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Mahr GmbH • Multimar 844 S
8.2 Adjusting a Multimar 844 T
8.2.1 Positioning the Multimar 844 T for inner measurement
8.2.2 Positioning the Multimar 844 T for outer measurement

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Mahr GmbH • Multimar 844 S
11
10
11
10
8.2.3 Setting the display unit by determining the reversing point (MIN or MAX)
by swiveling the Multimar 844 T
8.3 Setting the Multimar 844 T with long measuring arms
When using long measuring arms, 844 Sph spacers 11 are used on the 844 Sp parallel
jaws 10 to increase the measuring depth.
• 1 pair of 844 Sph 11 is required for 70 mm measuring arms.
• 2 pairs of 844 Sph 11 are used for measuring arms of 100 mm in length. Two spacers
stacked on top of one another are used for each side.

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Mahr GmbH • Multimar 844 S
13
A
14
Li
12
8.4 Setup for a MaraMeter 844 N
Required accessories:
1. 844 Neb setting bridge 13
2. Gage block combination A (inaccordancewiththereferencedimension)
3. 844ematjaw 14
4. 844 Sf base plate 12forverticaluse(ifnecessary)
Setting a dimensional reference Li for inner measurement:
Dimensional reference Li = gage block combination between 844 Neb 13 and 844 em 14

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Mahr GmbH • Multimar 844 S
13 14
8.5 Setting a MaraMeter 844 N
 Thedisplayunit(dialcomparatorordialgage)issetbydeterminingthereversingpoint
(MINvalue)byswivelingtheMaraMeter844Nbetweenthemeasuringsurfacesof
844 Neb 13 and 844 em 14.

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Mahr GmbH • Multimar 844 S
8.6 Setting in proper position provides maximum measuring accuracy
The Multimar 844 S setting instrument can be equipped with the optional 844 Sf base
plate. This allows the Multimar 844 S to be used in a vertical position as well.
To achieve maximum measuring accuracy, a comparative measuring instrument should be set
in the same position and measurement in or on the work piece should occur.
Example: A precise hole in a turned part should be measured in the lathe with a 844 N
bore gage. To do this, the 844 N bore gage must be inserted horizontally. It is in exactly this
horizontal position that the 844 N bore gage is to be previously calibrated.
Please note:
When setting the Multimar 844 S setting instrument in the vertical position, it is
recommendedthatthexedmeasuringcontactbeplacedonthelowerparalleljaw.
This way, the dead weight of the measuring instrument is supported by the lower parallel
jaw and not by the movable, spring-mounted, probe.
!