Home Page Address

http://www.newera.co.jp/en/pneumatic/index.html
E-mail Address

pneumatic@newera.co.jp

PICO POSITIONER PXY Series
Error Absorption Unit
Pico Positioner Has Added A New Size!

Bore Size φ20!! (Conventional Product φ12)

http://www.newera.co.jp/en/pneumatic/index.html
pneumatic@newera.co.jp

2016

RoHS Compliant

Features

Maximum Load Mass Mounting Parallelism Rated Static Load

3kg

0.01mm

6010N
Issued by
CAT NO. PXY-20 18-01

002-E.eps 1 2017/11/28 16:02:53

PICO POSITIONERPXY Series (φ12 and φ20)
A Positioning Error Absorption Unit that Allows Light and Smooth Sliding
Movement by Means of Cross Linear Guides, and can be Locked after
Returning to the Center Position by Pressurizing
Center Position Repeatability±0.05mm, Mounting Parallelism 0.01mm

Cross Linear Guide(Standard Type)High Accuracy, High Rigidity Linear Guide is built-in.

C

M

Centering

Positioning Pin HolesThe hole on the top of the bodycan be used for centering in
relation to the hole on the tableside surface.

Y

Pin holes for attaching / detaching
reproducibility are provided on
the top surface of the body andthe side surface of the table.

CM

MY

Corrosion Resistance
CY

Stainless steel is adopted.

Cross Linear Guide
CMY

Limited track type linear
guides of high-accuracy
and high-rigidity.

K

Side Seals
Side seals are provided at four
places to prevent the entry ofdust.

4-Point Contact
4-point contact guide which wellendures fluctuating load andcombined load, is adopted forthe linear guide.

Center Holding Type
Holding the center position byspring after exhausted.

Mounting of Workpiece
Workpiece can be mounted
directly on the surface of thetable.

Piping Port
When air is supplied. thepiston will make the positioning steel ball move towards
the table.

2

Steel Ball for Positioning
This ball is for returning of thetable to the center positionand locking the table at its
center position.

Countermeasure for Copper Parts

Lock-off Type

Copper parts are not used.

Lock is released by spring
after exhausted.

003-E.eps 1 2017/11/22 10:02:55

Summary of The PICO POSITIONER
A device, which realizes light and smooth sliding movement on X-Y plane by means of thesmall-sized cross linear guides while maintaining high-accuracy and high-rigidity, and enables
secure locking at center position with high repeatability by virtue of a built -in steel ball. This is“Pico Positioner”.
It can absorb a positioning error in the range of φ1mm to φ3mm (in the case of φ20) aroundthe center position.It can be returned from the deviated position to its center position and lockedby air pressure.
It is best suited for the use at the tip of a robot because of its thin and lightweight construction.

■Application Examples : PICO POSITIONER●Positioning error absorption at the insertion of a workpiece
Pico Positioner

Air Chuck
Workpiece
C

M

Y

CM

Deviatio

Deviatio

MY●Start of Insertion●Absorption of Deviation (error)●End of Insertion

CY●Return from the slid state to the center position
CMY

Workpiece

K

Pico Positioner
Deviation●End of Insertion●The table returns to the center position
and is locked when pressurized■MAIN BODY INSTALLATION(Bolt as shown in the figure are not supplied with products）

Top Mounting(Body Tap)

Top Mounting(By Means of LB Fixture)
PXY12 Only

●Finishing operation in locked state■MOUNTING(Bolt as shown in the figure are not supplied with products）

Top Mounting(Table Tap)

Bottom Mounting(Table Through-holes)3004-E.eps 1 2017/11/29 9:03:54

OPERATING PRINCIPLE■Range of Absorbing Error
The table can slide in the range of the circumference on the X-Y plane around the center position in the non-pressurized state.

rror

gE

bin
sor

b

of A

X

Y

ge
Ran

■Standard TypeC

When pressurized, the table will return to the center position and be locked.

M

Slide

Y

Returning

CM

MY

CY

CMY

K

Pressurizing

The state where the table is slid.
(The table is in a free state.)

Conical Surface

Slide

When pressurized, the table will returnto the center position and be locked.

Table

Conical Surface

Return to the center position

Intermediate Slider
Steel Ball
ExhaustPistonPressurization

End CoverWhen the table slides by external force in the non-pressurizedstate, the steel ball and the piston will be pushed down and thepiston will be stopped by the end cover.Table is in the free state.
The range that the table can slide is restricted by the contact of thesteel ball with the conical surface of the table.

4

When pressurized, the piston will push up the steel ball.
The table will return to the center position and be locked
by the contact of the steel ball with the conical surface inthe table.

005-E.eps 1 2017/11/22 10:38:12■Lock-off Type (LF)
After the air is discharged, the lock is released by the spring, which allows the table to move freely.

Free

Table

Conical Surface

Intermediate Slider

Pressurization

ExhaustSpringPiston for Lock-off

C

M

Y

When pressure is applied, the spherical surface of thepiston end is pressed against the conical surface of thetable, which returns the table to the center where it islocked.

When the air is discharged, the piston is returned to theoriginal position by the spring and the lock is released,
which allows the table to move freely.

CM

MY■Center Holding Type (BL, BM, BH)

CY

CMY

The table center position is maintained by the spring after the air is discharged.

K

Conical Surface

Table
Intermediate Slider

Pressurization

Steel Ball

ExhaustPistonWhen pressure is applied, the steel ball is pressed against
the conical surface of the table, which returns the table tothe center where it is locked.

SpringEven if the air is discharged, the piston keeps pressing thesteel ball against the conical surface of the table becauseof the spring, which locks the table at the center
position.Note that the table locking force is only the force
by the spring.

5

006-E.eps 1 2017/11/22 10:57:09

Model Code Example

PXY−SD12−2−BL
Series Name

Bore Size
12

φ12

20

φ20

Additional Function
No CodeLock-off Type

ＢＬ

Center Holding Force Weak Type
Holding Holding Force Medium TypeType
Holding Force Strong Type

ＢＭ
ＢＨ

Error Absorption Range
C

Code

M

1

φ1

2

φ2

3

φ3
Bore Size (φ20 Only)Y

CM

Error Absorption Range (mm)Tolerance of Error Absorption Range
MY

Mounting
CY

ＳＤ

Basic

CMY

K

ＬＢ

With Bracket (PXY12 Only)

Bracket6

Page 7

Standard Type

ＬＦ

Description of Additional Function
Page 5
Change of Additional Function
Page 13, 14
Holding Force of Center Hold Type
Page 12

007-E.eps 1 2017/11/28 16:15:53

SPECIFICATIONS
PXY12

PXY20

φ12㎜

Bore Size

φ20㎜
Ｍ5×0.8

Pipe Diameter
Returning System

Air Returning

Locking Pattern

Center Position Locking
Air

Working Fluid
Locking Area

0.7MPaMaximum Service Pressure
Minimum Service Pressure

0.1MPaProof Pressure

1.05MPa

Service Temperature Range

5〜60℃
60c.p.m

Maximum Service Frequency

3kg

Maximum Load Mass

1kg

Effective Returning Force

32Ｎ

Note

91Ｎ

Effective Holding Force

76Ｎ

Note

175Ｎ
Cross Linear Guide

Guide Mechanism
Sliding Area

φ1＋0.9−0.2

Error Absorption Range

φ2＋0.9−0.2

φ2 ＋0.9
−0.2

2310Ｎ

6010Ｎ

Rated Static Moment

7.62Ｎ・ｍ

33.8Ｎ・ｍRated Static Torque7.62Ｎ・ｍ40.3Ｎ・ｍNote: Standard Type at the air pressure 0.5 MPa.

M

THE TYPE OF LINEAR GUIDEMY

φ1 ＋0.9−0.2

Rated Static Load

C

CM

Note

Not required

Lubrication

Y

Note

φ3 ＋0.9−0.2

Page 11, 12

Product Mass

Unit : ｇ

Model

Type

Model

ＰＸＹ12

Wide Type Rail Size 9

ＰＸＹ12

130

25

ＰＸＹ20

Wide Type Rail Size 12

ＰＸＹ20

300

Without Bracket

Pressure: Zero or there is slight space.
Radial space
Page 17Main Body Mass Mass added with Bracket

Standard Type, Lock-off Type, Center Holding Type are same mass.

CY

CMY

OPTIONAL PARTS CODES

K

Name

Repair part set

PARTS CODE
Note

Content

ＨＰ（ＰＸＹ□）

Bracket (PXY12 Only)

End Cover Kit (PXY12)ＬＢ（ＰＸＹ12）

Bore SizeＥＣ（ＰＸＹ12−1）

ＥＣ（ＰＸＹ12−2）

For Error Absorption
Range φ1
End Cover Color : BlackFor Error Absorption
Range φ2
End Cover Color : WhiteFor details
Page 9With mounting bolts
and positioning pins
Use when changing the error absorption range.
Page 13

Lock-off Kit

Center Hold Spring

End Cover Kit (PXY20)

ＬＦ（ＰＸＹ□）ＢＬ（ＰＸＹ□）ＢＭ（ＰＸＹ□）ＢＨ（ＰＸＹ□）ＥＣ（ＰＸＹ20−□）Bore Size

Bore Size

Bore Size

Bore Size

Error Absorption Range

For details
Page 10

Common toError Absorption Ranges
φ1, φ2 and φ3.

For details
Page 13

Common to Error Absorption Ranges φ1, φ2 and φ3.

7

008-E.eps 1 2017/11/28 16:20:54

BODY INSTALLATION
Mounting by Bracket (Through-hole)

φD

φD

Model

C

Bolt Size

L

H

H

L

Top Mounting (Body Tap)

Screw Depth Fastening Torque Pin Holes for Positioning
N・m
L（㎜）
φＤ×Ｈ
（㎜）

Model

Bolt Size

Through-hole Fastening Torque Pin Holes for Positioning
Length
φＤ×Ｈ
（㎜）
N・m
L（㎜）

＋0.05

depth 3

PXY12 M3×0.5

2.8

＋0.05

depth 4PXY20

None (Without bracket)

PXY12 Ｍ3×0.5

5

1.1

φ3 0

PXY20 Ｍ4×0.7

5

2.5

φ4 0

1.1

＋0.05

φ3 0

depth 3M

Y

CM

MOUNTING ON TABLE

MYCY

Bottom Mounting

Top Mounting

CMY

φD

φD

Model

8

Bolt Size

L

H

H

L

K

＋0.05

depth 3Through-hole Fastening Torque Pin Holes for Positioning
Length
φＤ×Ｈ
（㎜）
N・m
L（㎜）
＋0.05
6.7
PXY12 M3×0.5
1.1
φ3 0 depth 3＋0.05

depth 4

PXY20 M4×0.7

Screw Depth Fastening Torque Pin Holes for Positioning
N・m
φＤ×Ｈ
（㎜）
L（㎜）

PXY12 M4×0.7

6.7

2.5

φ3 0

PXY20 M5×0.8

8

5.1

φ4 0

Model

Bolt Size

8

2.5

＋0.05

φ4 0

depth 4

009-E.eps 1 2017/11/22 11:56:40

STRUCTURE AND PRINCIPAL COMPONENTS（PXY-20）

918（PXY-12）
10

9

1

6

11

4

12

13

7

5

14

10

2

9

8

C

M

Y

CM

MY

CY

CMY

3

K

PRINCIPAL COMPONENTS
No.

No.

Name

1

Table

Name

Stainless Steel (Heat Treatment)

Material

Remarks

7

End CoverAluminum Alloy

Material

Anodized Finish

Remarks

2

Intermediate Slider Stainless Steel (Heat Treatment)

8

Spring Pin

Stainless SteelPXY12 Only

3

Body

Stainless Steel (Heat Treatment)

9Side Seals

Stainless Steel＋NBR (PXY12) POM (PXY20)

4

Ball

Stainless Steel (Heat Treatment)

10

Screw

Stainless Steel5

PistonSteel (Heat Treatment)

18

Spacer

Stainless Steel

6

Front CoverSynthetic ResinPXY20-φ1, φ2 Only

REPAIR PARTS
Material

Qty

11 Steel Ball

Stainless Steel (Heat Treatment)

1

13 O-ring

NBR

1

12 Piston Seal

NBR

1

14 Snap Ring

Steel

1

No.

Name

RemarksNo.

NameMaterial

Qty

Remarks
Nickel Plating9010-E.eps 1 2017/11/22 13:12:57

STRUCTURE AND PRINCIPAL COMPONENTS■Lock-off Type

15
16

12

■Center Holding Type
C

M

Y

CM

MY

17

CY

CMY

K

Lock-off Kit
No.

Name

Material

Qty

12 Piston Seal

NBR

１

15 Spring for Lock-off

Stainless Steel１

Remarks

No.

Material

Qty

Remarks

Steel (Heat Treatment)

1

Hard Chromium PlatedMaterial

Name

16 Piston for Lock-off

Spring for Center HoldingNo.
17

Material

Qty

Stainless Steel１

NameSpringRemarks

End Cover Kit
No.

Name

7

End Cover

13 O-ring

10

Material

Qty

No.

Name

Qty

Remarks

Aluminum Alloy

１

Anodized Finish 14

Remarks

Snap Ring

Steel

1

Nickel Plating

NBR

１

18

Spacer

Stainless Steel1

PXY φ1, φ2 Only

011-E.eps 1 2017/11/28 16:23:58

RETURNING FORCE■Effective Returning Force（Standard Type, Lock-off Type）
Returning force is the force with which the table returns to the center position when pressurized in the state
where the table is deviated from its center position.

140

PXY20

Center Position
Return120

Returning Force N

100
80
60

PXY12
40
20

C

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

PressurizationM

Air Pressure MPa
Y

CM

MY

CY

CMY

K

11

012-E.eps 1 2017/11/22 13:25:35

HOLDING FORCE■Effective Holding Force
Holding force is the force with which the table is locked and held at its center position in the state where the table
has returned to its center position and been locked by pressurization.

●Effective Holding Force when pressurized (Standard Type, Lock-off Type, Center Holding Type)
250

PXY20
200

Holding Force N

150

PXY12
100

50
C

M

0

Y

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Air Pressure MPa

CM

MY●Effective Holding Force by Spring Force Only (Center Hold Type)CY

For the effective holding force by the force of the built-in spring alone without pressurizing the air, refer to the table below.
Note that the values are reference values. Be sure to allow for a margin.

CMY

K

PXY12

PXY20

Option Code Effective Holding Force (Reference Value)

Option Code Effective Holding Force (Reference Value)

BL

2〜4Ｎ

BL

8〜14Ｎ

BM

3.5〜6.5NBM

14〜21N

BH

6.5〜11Ｎ

BH

21〜28Ｎ

When the PICO POSITIONER is used as it is laid on the side as shown in the figures below,
consider the mass of the table, intermediate slider and body in addition to the mass of themounted load with reference to the effective return force and effective holding force.

40ｇ

90ｇ

Table

40ｇ

90ｇ

Intermediate Slider

25ｇ

55ｇ

Body

65ｇ

Intermediate Slider

Table

12

Table

PXY12 PXY20

PXY12 PXY20

PXY12 PXY20

PXY12 PXY20
Table

155ｇ

Body

65ｇ

155ｇ

Intermediate Slider

25ｇ

55ｇ

Intermediate Slider

Body
Body

013-E.eps 1 2017/11/28 16:29:07

CHANGE OF FUNCTION
The following shows how to make changes to the standard type to add other functions.
Refer to this explanation also for making changes to types other than the standard type to add other functions.

■Change of Error Absorption Range

Error Absorption Range and
End Cover Color (PXY12)

The error absorption range can be changed by replacing with the end cover kit separately
offered. The end cover is common to the lock off, center hold and standard types.
(See Table on the Right) Details of Separately Offered Part
Page 7, 10

Error Absorption Range End Cover Color
φ1

Black

φ2

White

Error Absorption Range andSpacer Thickness (PXY20)

Table

Error Absorption Range Spacer Thickness

Intermediate Slider
Piston

φ1

1.0㎜

φ2

0.5㎜

φ3

None

Steel Ball

O-ringEnd CoverSnap Ring
C

Assembly Procedure

1. Remove the retaining ring for hole.
2. Remove the end cover.

Step

Step

M

Disassembly Procedure

1. Mount the O-ring on the replacement end cover.
2. Mount the end cover and secure with the retaining
ring for hole.

Y

When the end cover is removed, the piston and steelMYball may easily fall off. Without the piston and thesteel ball, the table and intermediate slider move

Note

Note

CM

Make sure that the retaining ring for hole is correctly
mounted.

freely and may fall off. Use caution when handling.

CY■Change to Lock Off TypeCMY

K

The standard type can be changed to the lock off type by replacing with the lock off kit separately offered.
Details of Separately Offered Part
Page 7, 10
Table

End CoverSnap Ring

Intermediate Slider

Spring for Lock-off

Steel Ball
PistonDisassembly Procedure

Assembly Procedure
1. Mount the piston seal on the piston for lock off.
2. Assemble the spring for lock off and piston for lock off.
3. Mount the end cover and secure with the retaining ring for hole.

Note

When the end cover is removed, the piston and steel
ball may easily fall off. Without the piston and thesteel ball, the table and intermediate slider movefreely and may fall off. Use caution when handling.

When the end cover is removed, the piston and steel
Noteball may easily fall off. Without the piston and thesteel ball, the table and intermediate slider movefreely and may fall off. Use caution when handling.

Piston for Lock-off

Step

Step

1. Remove the retaining ring for hole.
2. Remove the end cover.
3. Remove the piston and the steel ball.

Piston Seal

13

014-E.eps 1 2017/11/28 16:30:08

CHANGE OF FUNCTION■Change to Center Hold TypeThe standard type can be changed to the center hold type by integrating a spring separately offered. Replacing with anotherspring separately offered allows the center holding force to be changed.
Details of Separately Offered Part
Page 7, 10

Table

Intermediate Slider
PistonSteel Ball

SpringEnd CoverSnap Ring

Disassembly ProcedureCM

1. Mount the spring on the piston.
2. Mount the end cover and secure with the retaining
ring for hole.

Note

When the end cover is removed, the piston and steel
ball may easily fall off. Without the piston and thesteel ball, the table and intermediate slider movefreely and may fall off. Use caution when handling.

Y

Step

1. Remove the retaining ring for hole.
2. Remove the end cover.

Note

M

Assembly Procedure

Step

C

Until the cover is secured with the retaining ring forhole, the end cover may be pushed away by the
spring force. Use caution when handling.

MYCY

For the design value of the spring used for the center hold type, refer to the table below.
CMY

For designing the spring, refer to the following JIS Standards.
J I S B 2702 Hot Formed Helical Springs

K

JIS B
JIS B

2704
2708

Helical Compression and Extension Springs -- Design Criteria
Cold Formed Helical Extension Springs

Model

Spring Outer
Diameter(mm)

Spring Set
Height(mm)

Set Load
Value(N)

Stroke End
Height(mm)

ＰＸＹ12-ＢＬ

φ6

5.4

1.5

4.2

ＰＸＹ12-ＢＭ

φ6

5.4

3

4.2

ＰＸＹ12-ＢＨ

φ6

5.4

6

4.2

ＰＸＹ２０-ＢＬ

φ6

8.7

4.8

7.2

ＰＸＹ２０-ＢＭ

φ6

8.7

11.1

7.2

ＰＸＹ２０-ＢＨ

φ6

8.7

15

7.2

The value for the stroke end height given is for the error absorption range φ2 (PXY12) or φ3 (PXY20).

Item Descriptions and Precautions
Item

14

Item Descriptions

Note

Spring Outer Diameter

Any value larger than those in the table hinders mounting on the piston and end cover. Ensure that the value is that shown in the table or smaller.

Spring Set Height

Spring length as it is set.

Set Load Value

Spring load value as it is set.

Stroke End Height

Spring length with the piston directly touches the end cover.

Ensure that the value is that shown in the table.
Ensure that the value is that shown in the table.

015-E.eps 1 2017/11/22 15:02:27

MATTERS TO BE NOTED FOR DESIGNING AND OPERATION
Warning
Failure of Power Supply and Abnormal Condition of Supply Pressure

Mounting Surface Accuracy

If supply pressure goes up/ down abnormally due to failure orother troubles of power sources such as electricity or airpressure. returning and holding forces of Pico Positioner will
also change accordingly and malfunction may occur. Take
necessary measures against this situation not to hurt humanor damage devices.

① The table top side and the body bottom side of PICOPOSITIONER are precision-ground. Ensure that the mating
mounting surface of a machine, equipment, jig, etc. is a flat
surface machined to high precision without unevenness or
projections and mounting is correct in order to achieve
stable, high-accuracy linear motion.
Low mounting surface accuracy or incorrect mounting may
cause looseness, increase the rolling resistance or adversely
affect the service life.
Mounting Datum Plane of Table and Body
Page 17

Range of Positioning Error Absorption
An error beyond this range will generate excessively large
load or moment to cause failure of Pico Positioner or breakage
of a workpiece.

Shock Absorption at Stopping
In the case Pico Positioner is moved straight or turned aroundby a robot or another actuator. and stopped suddenly. the lockmay be unlatched or the linear guide may be broken due toexcessively large inertia force. Shock absorption by cushioning, shock absorbers, etc. shall be considered on designing.

② It is recommended to provide a recess in the corner of amating mounting surface of the table and the body but acurve as shown in the figure below can be made for use.
A larger corner profile than the chamfer dimension of the
body or table may cause inaccurate contact with the abuttingA
surface.

A

C

Resistance of Piping and Wiring
M

Y

Smooth movement of Pico Positioner may be hindered by theresistance of piping or wiring. Consider the resistance againstsmooth operation in the design stage.

CM

Removal of Pico Positioner
MY

CY

When the Pico Positioner is to be removed from a device formodification or maintenance, shut off the supply of compressed
air and discharge the residual pressure.

CMY

At Operation
K

When actuator is in operation or power supply is not shut off.
never put your fingers. hands. tools, etc. into the moving areaof devices or Pico Positioner inadvertently to prevent injury or
accident.

R0.2 or less
R0.2 or lessB
B
③ Ensure that there is no squareness error between the table orbody mounting surface and the abutting surface.
Inadequate squareness may cause inaccurate contact withthe abutting surface.
θ°

A

θ°

B

④ When designing the abutting surface, pay attention to theheight and thickness of the abutting surface.
Inadequate thickness may lead to poor accuracy due toinsufficient rigidity against transverse load or positioning witha lateral pressing bolt.

Rolling Feel in Linear Guide
Setting of Covers
If water. oil, cutting fluid, dust. iron powder, spatter. etc. aredeposited on the linear guides, damage, rust, etc. may occur
to cause malfunction. Set covers on the linear guides toprevent such deposition.

When the table is moved by hand without pressurizing the air,rolling of balls inside the linear guide may cause slight feel ofoperation discontinuity or difference in the rolling resistance
between products. This is due to radial clearance of the linear
guide and does not affect the performance.

Mounting and Adjustment

PICO POSITONER Movement

When mounting a workpiece on the guide table, support theworkpiece with a wrench, etc. to prevent any load or impact
applied to the table.

When moving the PICO POSITIONER with another actuator,etc., pressurize the air to lock the table.
Pressurize the air and lock the table also for the center hold type.
If the table is not locked by the air, the inertial force of themounted load may cause damage or injury to equipment orhuman body.

Rigidity of Mounting BaseIf rigidity of mounting base or mounting method of Pico
Positioner on the machinery is not adequate, it may be
impossible for Pico Positioner to demonstrate its high-rigidity
and high-accuracy.
On designing, due consideration shall be given to rigidity ofmachinery such as mounting base.

Positioning Pin Holes in Table and Body
Press-fitting a pin into a positioning pin hole may cause failure
due to deformation of the rolling surface of the linear guide orexcessive load applied during press-fitting. The pin hole ishardened by heat treatment and crack or damage may occur.
Ensure that the fit allows for a clearance between the holeand the pin (clearance fit: tolerance class position g max.).

15

016-E.eps 1 2017/11/22 15:14:28

MATTERS TO BE NOTED FOR DESIGNING AND OPERATION
CautionMoment by the Returning ForceIn the case the table returns from the slid position after insertion of a workpiece to the center position as shown in the figure
below. if the actuator is pressurized before the release of the workpiece, the workpiece and/or the linear guide may be damagedby the returning force and a large moment generated by it.
Rated static moment
Page 20●Possibility of Damage of a Workpiece●Generation of a Large Moment

Air Chuck

Air Chuck
Workpiece

Workpiece

Returning Force

Returning ForceL

MomentC

M

YDeviationCM

Deviation

MY

Greasing

Table Slide Resistance (Standard Type)

Bearing ball area is filled with grease before dispatch theactuator. During operation. depending on operating time,
operating condition. environment and etc., grease deteriorate.
And this cause the bearing to shorten its life because of wearof rolling area.
As this actuator has small amount of movement of table (slide
amount), enough rolling of the ball of the linear guide cannot
be obtained and loss of oil film may occur to generate local
corrosion. ("fretting corrosion") Periodic regreasing is necessary
to the ball rolling surfaces.
Greasing interval depends on the operating condition andenvironment. As a guide, perform greasing every one to threemonths in the ordinary operation.
For grease, please use lithium soap base one.

When pressure is applied, the piston lifts up the steel ball andreturns the table to the center position, where it is locked.
With the standard type, the piston and the steel ball stays attheir positions even if the air is discharged.(Locking force is
not generated.）
Accordingly, the force to move the piston and the steel ball tothe end cover side required when the table is slid by external
force after the air is discharged translates to the slide
resistance. Use caution to prevent any damage to workpieceand jig. Use of the lock off type is recommended.

CY

CMY

K

Area to be greased Area to be greased

Area to be greased Area to be greased

16017-E.eps 1 2017/11/22 15:23:22

Accuracy■Bearing Accuracy

E

D

C

Unit : mm
PXY12

PXY20

Parallelism of plane B against plane A

0.01

0.01

Running Parallelism of plane B against plane A

0.01

Model
C

M

0
−0.1

0
−0.1

Dimensional tolerance of D

0
−0.1

0
−0.1

Dimensional tolerance of E

±0.05

±0.08

Y

CM

0.01

Dimensional tolerance of C

MY

CY

CMY

■Radial Clearance

K

Radial Clearance● Radial clearance is the numeric value of the movement of
the center of the table when the guide table is moved up
and down lightly by a constant force.
● Pico Positioner is not pre-loaded because it is so designed
as to absorb positioning error by sliding lightly and smoothly.

Unit : mm
Model

PXY12・PXY20

Radial Clearance

0〜＋0.004● Radial clearance indicated is the value for one unit of thelinear guide.As Pico Positioner adopts the cross linear
guides, having a structure in which two units of linear guideare combined. So. radial clearance for one Pico Positioner
is twice the indicated value.

17018-E.eps 1 2017/11/28 16:31:11

THEORETICAL DISPLACEMENT OF TABLE BY BENDING MOMENTIf an external force is applied to the table, the table inclines slightly because of elastic deformation of balls andraces. Refer to the following graph of theoretical angular displacement of the guide table for each moment
shown below.

PXY12

T0

Theoretical Deflection Angle [deg]

0.12

T0

0.10
M0

0.08
0.06

M0

0.04

0

M

0.02
0

0.5

1

1.5

2

Bending Moment N・m

PXY20
Theoretical Deflection Angle [deg]

C

M

Y

CM

MY

CY

CMY

K

0.10
0.09

T0

0.08
0.07

M0

0.06
0.05
0.04
0.03
0.02
0.01
0

2

4

6

Bending Moment N・m

18

8

10

019-E.eps 1 2017/11/28 16:35:32

ALLOWABLE LOAD MASS, ALLOWABLE LOAD AND ALLOWABLE MOMENT
CautionUse this unit after verifying that the applied load is within the allowable value.
Any service conditions exceeding the allowable values may affect operation, accuracy and life,and may even result in breakage.
Types of Load Situation of Actuator Situation of Load

Item to be confirmed

Mounted Load

OperatingContinuously Acting Allowable Load Mass, Allowable Range of the Center of Gravity of Workpiece

External Force

Stopping

Temporarily Acting Basic Rated Static Load, Rated Static Moment, Rated Static Torque■Direction of Moment
Direction of moment can be classified into the following three.

T0

C

M0

M0

M

Y

CM

MY

■Allowable Load Mass and Allowable Range of the Center of Gravity of Workpiece
CY①Maximum Load Mass

PXY12

PXY20

1kg

3kg

②Allowable Range of the Center of Gravity of Workpiece

50mm

In the case the unit with a workpiece is moved straight or turned around by a robot or other actuator, too large
moment may be generated by the inertia force of the workpiece. The distance L between the center position of
the bearing and the center of gravity shall be within the restricted range.

ℓ21 ＋ℓ22 ＋ℓ23 ＝L≦50㎜
Centerof Gravity

ℓ3
ℓ2

L
Center Position of
the Bearing

1

K

When Pico Positioner is operated with a load mounted, confirm that the following two items are respectively
within the allowable values.

ℓ

CMY

19

020-E.eps 1 2017/11/22 16:35:04

ALLOWABLE LOAD MASS, ALLOWABLE LOAD AND ALLOWABLE MOMENT■Allowable Load Mass and Allowable Moment for External Force (under stopped state)
In the case that an external force is applied temporarily on the actuator under stopped state such as the stroke
end, verify that each value in the following 2 items is within the allowable value.

① Magnitude of the External Force (Basic Rated Static Load)②Moment of the External Force (Rated Static Moment and Rated Static torque)
Note: Calculate the moment by using the distance between the center position of guide and the position of external force as thelength of arm of moment.

If an excessively large load or impact load is exerted on the table while it is standing still, permanent deformation
is locally generated between the ball of the guide and the ball rolling surface. This permanent deformation will
prevent the actuator from smooth operation when it develops more than the allowable limit.
The basic rated static load Co, the rated static moment Mo and the rated static torque To respectively meansuch a static load, static moment and static torque of fixed direction and magnitude that the sum of the permanent deformation at the ball and the ball rolling surface is 0.0001 of times the ball diameter on the contact
surface receiving the maximum stress.
The static force applied to the table shall be within the range to meet the following formulas.

CC0≧fs・P

C0：Basic Rated Static Load N
P ：Static Load N
fs ：Static Safety Factor

M0≧fs・M1

M0：Rated Static Moment N・m
M1：Static Moment N・m
fs ：Static Safety Factor

MYT0≧fs・T1

T0：Rated Static Moment N・m
T1：Rated Static Moment N・m
fs ：Static Safety Factor

CM

MY

Static Safety Factor fs
CY

CMY

Load Condition

Lower limit of fs

Light Load without Impact

1.0〜1.3

Heavy Load without Impact

2.0〜3.0

K

Basic Rated Static Load, Rated Static Moment And Rated Static Torque
Model

20

Basic Rated Static Load C0 Rated Static moment M0 Rated Static Torque T0
N・m
N・m
N

PXY12

2310

7.62

7.62

PXY20

6010

33.8

40.3

021-E.eps 1 2017/11/22 16:54:50

DIMENSIONS PXY12 BASICＬＦ
PXY−SD12− 1 −
2 ＢＬ
ＢＭ
ＢＨ
Basic
Bore Size48
Depth 1.5
φ8＋0.050Depth 3φ3＋0.05
04

4−Ｍ4×0.7 Through-hole
φ3.3 Through-hole

34

10

3 0

＋0.05

Additional Function
No Code・・・・・・Standard Type
ＬＦ・・・・・・・・Lock-off Type
ＢＬ，ＢＭ，ＢＨ・・Center Holding Type10±0.0510

Depth 3

Error Absorption Range

40

C

30
M

7

CY

4

MY

16

CM

24±0.05

6.7
11.2

3.5

Y

0

18−0.1CMY
020

2−Ｍ3×0.5 Depth 418−0.1(Same on back side)(Same on back side)30

Ｍ5 (Air Port)

12
4−M3×0.5 Depth 5

±0.05

28

14

4

Depth 3
3＋0.05
0

14

K

＋0.05

φ3 0

Depth 3

＋0.05

φ13 0

Depth 2

Note :
Figures show unit at the locked state on center position.

21

022-E.eps 1 2017/11/28 16:37:38

DIMENSIONS PXY12 WITH BRACKETPXY−LB12−1 −ＬＦ
2 ＢＬ
ＢＭ
With Bracket
ＢＨ

48

Bore Size
＋0.05

φ8 0

Depth 1.5

±0.05

＋0.05

10 10

φ3 0

Depth 3

4

＋0.05

42

50

34

10

3 0

Additional Function
No Code・・・・・・・Standard Type
ＬＦ・・・・・・・・・Lock-off Type
ＢＬ，ＢＭ，ＢＨ・・・Center Holding Type

Depth 3

Error Absorption Range

18
4−φ6Counterbore Depth 3.2
φ3.5 Through-hole26

4−M4×0.7 Through-hole
φ3.3 Through-hole

C

40

M

30

Y

0

24

MY

K

20
(Same on back side)

2−M3×0.5 Depth 4(Same on back side)

6

10

CMY

13

22

CY

0
18−0.1

Ｍ5×0.8 (Air Port)

30

42

4

Depth 3
3＋0.050Note :
Figures show unit at the locked state on center position.

22

30

11.2

CM

6.7

3.5

18−0.1

Depth 3φ3＋0.050023-E.eps 1 2017/11/22 17:14:08

DIMENSIONS PXY20 BASIC
LF
1
ＢＬ
PXY−SD20− 2 −
ＢＭ
3
ＢＨ
Basic

68

Bore Size

13

13

±0.05
＋0.05

φ4 0

5

14

Additional Function
No Code・・・・・・・Standard Type
ＬＦ・・・・・・・・・Lock-off Type
ＢＬ，ＢＭ，ＢＨ・・・Center Holding Type

Depth 446

4−Ｍ5×0.8 Through-hole
φ4.2 Through-hole
Depth 4
4＋0.050Error Absorption Range

58
＋0.05

φ8 0

C

Depth 1.540024−0.1

3.1

M

8.5

21.9

25
(Same on back side)

0

2−Ｍ4×0.7 Depth 5(Same on back side)

24−0.140
Ｍ5×0.8 (Air Port)

16
＋0.05

Depth 44−M4×0.7 Depth 5

5

4 0

38

19

K

19±0.05

CMY

6

CY

31

MY

±0.08

8

14

Y

CM

Depth 4
φ4＋0.05
0

＋0.04

φ21 0

Depth 2.2

Note :
Figures show unit at the locked state on center position.

23