Mitutoyo 505-739, 505-745, 505-736 User manual

User's Manual

Dial Caliper

No. 99MAC003A

Date of publication: July 1, 2021 (1)

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Safety Precautions

To ensure operator safety, use this product in conformance with
the directions, functionsand specifications given in this User's
Manual. Use under other conditions may compromise safety.

CAUTION

• The outside and inside measuring jaws of this caliper have

Shows risks that could result in minor or moderate injury.

sharp edges. Handle it with great care to avoid injury.

• Do not measure the workpiece if it is rotating. There is a risk

of injury due to being caught in the machine, etc.

■

Conventions and wording indicating prohibited and mandatory actions

Indicates concrete information about prohibited actions.

Indicates concrete information about mandatory actions.

Content
s

1

Code Number ……………………………………………………2
2
3

4
5
6

7

8
9
10

11

Names of Components …………………………………………2

Product Applications ……………………………………………2

Precautions before Use …………………………………………2

Basic Usage ………………………………………………………3

Confirmation before Measurement ……………………………3

Measurement Method ……………………………………………4

Reading Measurements …………………………………………6

Zero Point Adjustment of Pointer ………………………………

Precautions after Use ……………………………………………7

Maximum Permissible Error of Indicated Values ……………7

7

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1 Code Number

505-730 505-731 505-732 505-733 505-734 505-735
505-736 505-737 505-738 505-739 505-740J 505-741J
505-742J
505-742-56J
505-748 505-749 505-750

Names of Components

2

505-742-51J 505-742-52J 505-742-53J 505-742-54J 505-742-55J

505-743J 505-744

505-745 505-746 505-747

① ② ③ ④ ⑤ ⑥ ⑦ ⑧

⑯

⑰

⑮

① Inside measuring jaws
② Main scale reading edge

③ Slider
④ Pointer

⑤ Dial graduation

⑥ Slider clamp screw
⑦ Beam
⑧ Depth bar

⑨ Depth measuring faces

⑨⑪ ⑩⑭ ⑬ ⑫

⑩ Sliding surface (reference surface)

⑪ Main scale
⑫ Thumb roller

⑬ Finger rest

⑭ Bezel clamp screw

⑮ Outside measuring jaws

⑯ Rack

⑰ Step measuring faces

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3 Product Applications

Outside
measurement

Inside
measurement

Step
measurement

Depth
Measurement

4 Precautions before Use

• Before using this product for the first time, wipe the rust preventive oil from the

product with a soft cloth soaked with cleaning oil. If the rust preventive oil is left
on the product, it will dry on and the motion may become stiff. In this case,

wipe the sliding surface (reference surface) with a cloth to improve the motion

further.

• If cutting chips or debris adhere to the beam, measuring faces, or graduations,

wipe them off with chamois or gauze, etc.

• Apply clean oil to the beam, especially the sliding surface. This protects the

sliding surface and improves the slider motion.

• Do not perform the adjustment at sites where the temperature will change

abruptly. Thermally stabilize the instrument sufficiently at room temperature.

• Be careful not to allow cutting chips or dust to enter the rack. Chips or particles

can damage the rack, degrading accuracy or causing the pointer to skip and
the zero point to deviate.

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5 Basic Usage

■ Holding the caliper and moving the slider

Grasp the beam lightly with your right hand, put your right thumb on
the slider finger rest, and slide the slider horizontally for measurement.

Tips

■ Fixing the slider

• For the measuring method details, refer to "7

Measurement Method".

• The thumb roller is a feed mechanism for handier open/close

operation of the inside and outside jaws. Rotate the thumb roller with
your thumb for fine adjustment of the slider.

Reading of the main scale and dial is usually taken with the workpiece
clamped (or in close contact). However, depending on the measuring
location, the orientation during measurement and so on, it may be difficult

to get a reading in this position.

In this case, tighten the slider clamp screw, move the caliper carefully
away from the workpiece, and take the reading.

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6 Confirmation before Measurement

■ Confirming Slider Movement

• Confirm that there is no irregular slider movement and that the slider moves
smoothly throughout the measurement range.

• Confirm that there is no play of the slider in the vertical direction against the
sliding surface.

■ Confirming that Pointer is on Dial Graduation Zero Point

• Confirm that the pointer is pointing at the dial graduation zero point with each
jaw measuring face closed.

• If the pointer deviates from the dial graduation zero point, the pointer zero point
needs to be adjusted. For the adjustment method details, refer to "9 Zero Point
Adjustment of Pointer".

■ Confirming Clearance (Wear) between Measuring Faces

• When the outside measuring jaws are closed and held to the light, confirm that
there is no slit observed between the jaws against the light, or that a faint light
is uniformly visible. As well, confirm that the jaw tips are not deformed.

• When the inside measuring jaws are closed and held to the light, observing the

jaws obliquely, confirm that a light is uniformly visible, and that the tips are not

deformed.

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7 Measurement Method

2 3

■ Precautions when measuring

Do not measure the workpiece if it is rotating, etc. Measuring faces will be
worn out.

■ Outside measurement

2

3

1

2 3

• Do not apply excessive force to the

workpiece.

Excessive measuring force will cause

measurement error because of the

positional deviations of the jaws.

• Do not clamp the workpiece diagonally.

Measurement error will ensue if tilted.

L1

D

L2

D

OK

L1 < D

Clamp the workpiece as close to the sliding
surface as possible. Measurement error is
more likely to increase if clamped near the
outside measuring jaw tips.

1

Insert the workpiece into the outside measuring jaws and bring jaws

into close contact with the workpiece, using appropriate and uniform
measuring force.

2

With the workpiece clamped, take the main scale and dial readings.

OK

OK

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■ Inside measurement

2 3

3

1

2

• Insert the inside measuring jaws as deeply
as possible into the workpiece.

• For inner diameter measurement, bring the
measuring faces into close contact, and read the
value when the pointer indicated value is
maximum: a direct line between the measuring
faces passes through the center of the cross­section.

• For groove width measurement, bring the
measuring faces into close contact, and read the
value when the pointer indicated value is
minimum: a direct line between
perpendicular to the groove inner wall.

the faces is

OK

OK

OK

1

Insert the inside measuring jaws into the workpiece, and bring jaws into

close contact with the workpiece interior using appropriate and uniform measuring
force.

2

With the workpiece inserted, take the main scale and dial readings.

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■ Step measurement

2 3

2

1

3

2 3

Do not use a depth bar for step
measurement, as the small contact area

with the workpiece makes it difficult to

retain a stable orientation

For a stepped workpiece, bring the entire
stepmeasuring surfaces (

contact with the workpiece

1

Bring the step measuring face (①, beam side) into close contact with the

①, ②

) into close

②
①

workpiece.

2

Move the slider until the step measuring face (②, slider side) strikes the

workpiece (stepped surface).

3

With the measuring faces in close contact, take the reading.

OK

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■ Depth measurement

1

2 3

2

3

1

Bring the depth measuring surface (beam side) into close contact with the

workpiece.

The depth measuring face is narrow and
unstable. Bring it into contact

perpendicular with the workpiece.

OK

OK

2

Move the slider until the depth measuring surface (depth bar side) makes

contact.

3

With the measuring faces in close contact, take the main scale and dial

readings.

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8 Reading Measurements

The measurement value (C) is obtained by adding the main scale reading (A) and
the dial reading (B). The resolution (dial graduation interval value) is shown near the

center of the dial face.

■ For Resolution: 0.02 mm (1 main scale graduation: half dial graduation
rotation)

1

Take the main scale reading (A) shown by

the main scale reading edge.

0

.9

.1

For example, if the main scale reading edge

is between 76 mm and 77 mm, read the
smaller "76 mm".
A = 76 mm

2

Take the dial reading.

.8

.7

.6

.5

0.02mm

.4

.3

.2

.1

.9

A

0

Take the dial reading for within one main
scale graduation position. For example, if the
pointer points to "34", read "0.34 mm".

B = 0.34 mm

3

Add the main scale and dial readings for the measurement value (C).

C = A + B = 76 mm + 0.34 mm = 76.34 mm

■

For Resolution: 0.01 mm (1 main scale graduation: full dial graduation rotation)

1

Take the main scale reading (A) shown by

the main scale reading edge.

For example, if the main scale reading edge

is between 91 mm and 92 mm, read the
smaller "91 mm"
A = 91 mm

2

Take the dial reading.

B

90

80

0.01mm

70

60

A

50

Take the dial reading for within one main
scale graduation position. For example, if the
pointer points to "85", read "0.85 mm".

B = 0.85 mm

3

Add the main scale and dial readings for the measurement value (C).

C = A + B = 91 mm + 0.85 mm = 91.85 mm

.2

.8

10

40

.3

.4

.5

.6

.7

20

30

B

0.02 mm

0.01 mm

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■

For Resolution: 0.001 in (1 main scale graduation: half dial graduation rotation)

1

Take the main scale reading (A) shown by

the main scale reading edge.

For example, if the main scale reading edge

is between 2.8 in and 2.9 in, read the smaller
"2.8 in".
A = 2.8 in

2

Take the dial reading.

Take the dial reading for within one main

90

10

80

70

A

20

0.001

30

60

40

50

B

0.001 in

scale graduation position. For example, if the
pointer points to "34", read "0.034".

B = 0.034 in

3

Add the main scale and dial readings for the measurement value (C).

C = A + B = 2.8 in + 0.034 in = 2.834 in

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9 Zero Point Adjustment of Pointer

Wipe any cutting chips, dust, or oil carefully off the measuring faces, and with the
jaws closed,
if the pointer deviates from the dial graduation zero point, adjust the pointer zero

point with the method below.

2

0

.1

.9

.2

.8

.7

.6

.5

.4

.3

.3

.4

.5

.6

.7

.8

.2

.90.1

1

1

Loosen the bezel clamp screw.

2

Rotate the bezel to align the dial graduation zero point and the pointer.

3

Tighten the bezel clamp screw.

0

.9

.1

.8

.2

.7

.6

.5

.4

.3

.3

.4
.5

.6

.7

.2

.8

.1

.9

0

3

10 Precautions after Use

• If there is dirt on the measuring faces, sliding surface, etc., wipe it away with a
dry cloth or a cloth slightly moistened with alcohol.

• For long-term disuse, wipe away any dirt carefully and apply a light coating of
rust preventive oil before storage.

• Do not store in locations with high temperatures, low temperatures, high
humidity, or exposure to direct sunlight.

11 Maximum Permissible Error of Indicated Values

MPE

See "

MPE (E

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MPE

, S

)

".

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MPE (E

MPE

, S

MPE

)

505 Sereis

0.02 mm: 505-730, 505-731, 505-734, 505-735, 505-745

*L (mm) E

0 ≤ L ≤ 50 ±0.02 ±0.04

50 < L ≤ 200 ±0.03 ±0.05

200 < L ≤ 300 ±0.04 ±0.06

0.01 mm: 505-732, 505-735

*L (mm) E

0 ≤ L ≤ 150 ±0.02 ±0.04

150 < L ≤ 200 ±0.03 ±0.05

0.001 in:

*L

505-742J, 505-743J, 505-736, 505-737, 505-738, 505-739, 505-746, 505-747, 505-748,
505-742-51J, 505-742-52J, 505-742-53J, 505-742-54J, 505-742-55J

*L (inch) E

0 ≤ L ≤ 6 ±0.0010 ±0.0020

6 < L ≤ 12 ±0.0020 ±0.0025

Measured length

MPE

MPE

MPE

(mm) S

(mm) S

(inch) S

MPE

MPE

MPE

(mm)

(mm)

(inch)

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