Table Of ContentHIGH ACCURACY AND HIGH RIGIDITY
BALLSCREW ACTUATOR
SG SE SC
, ,
SERIES
CONTENTS
BallscrewActuators ………………………………………………………………………FrontMatter2
FeaturesofSG/SESeries ………………………………………………………………FrontMatter3
KeyComponentsandMaterialsofSGandSESeries ………………………………FrontMatter4 F
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FeaturesofSCSeries(Full-CoverType) ………………………………………………FrontMatter5 n
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KeyComponentsandMaterialsofSCSeries …………………………………………FrontMatter6
a
VariationsofSlideBlock …………………………………………………………………FrontMatter7 tte
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SummaryofAccuracyIndicators ……………………………………………………FrontMatter8-10
Rigidity ……………………………………………………………………………………FrontMatter11
OptionandManufacturingbyOrder……………………………………………………FrontMatter12
HowtoInterpretModelNo. ……………………………………………………………FrontMatter13
ForSafetyUse……………………………………………………………………………FrontMatter14
BallscrewActuator/CommonInstructions ……………………………………………FrontMatter15
HighAccuracyBallscrewActuators/SGSeriesContents ……………………………………………1
Variations, ModelNo.……………………………………………………………………………2
Specifications ……………………………………………………………………………………3
Accuracy …………………………………………………………………………………………4
Inertia ……………………………………………………………………………………………5
SG20 Dimensions……………………………………………………………………………6-13
SG26 Dimensions …………………………………………………………………………14-21
SG33 Dimensions …………………………………………………………………………22-33
SG46 Dimensions …………………………………………………………………………34-43
SG55 Dimensions …………………………………………………………………………44-50
HighRigidityBallscrewActuators/SESeriesContents ……………………………………………51
Variations, ModelNo. …………………………………………………………………………52
Specifications …………………………………………………………………………………53
Accuracy ………………………………………………………………………………………54
Inertia……………………………………………………………………………………………55
SE15 Dimensions …………………………………………………………………………56-61
SE23 Dimensions …………………………………………………………………………62-69
SE30 Dimensions …………………………………………………………………………70-77
SE45 Dimensions …………………………………………………………………………78-87
Full-CoverTypeBallscrewActuators/SCSeriesContents…………………………………………89
Variations, ModelNo. …………………………………………………………………………90
Specifications …………………………………………………………………………………91
Accuracy ………………………………………………………………………………………92
Inertia……………………………………………………………………………………………93
SC23 Dimensions …………………………………………………………………………94-97
SC30 Dimensions…………………………………………………………………………98-101
SC45 Dimensions ………………………………………………………………………102-105
SensorSpecifications……………………………………………………………………………106-108
TechnicalDataForBallscrewActuators ………………………………………………………109-119
Frontmatter1
BALLSCREW ACTUATORS
r
e
att A ballscrew actuator of KURODA is a compact single-axis unit consisting of a ball
m
nt screw and a slide guide. With its slide block set in U-guide rail, the actuator has
o
r achieved low-profile design and compact shape, making it possible to considerably
F
reduce necessary space as compared with the usual table type structure. Despite
of its compact structure, the actuator with U-guide rail shows high rigidity against
bending moment and deflection, and it can be applied to a structure supported by
one end. The linear motion unit, which is gothic arched and in 4 points-contact
structure, makes it possible to deliver high precision and high rigidity.
POSITIONS OF BALLSCREW ACTUATORS
h h
SG series
g g
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H H Aluminum-frame
ballscrew actuators
SE/SC series SG series
y
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g p
i S SE/SC series
R
Aluminum-frame
ballscrew actuators
Low Accuracy High Low Accuracy High
WIDE VARIATIONS
SG series SE series SC series (Note 2)
Model No.
SG20 SG26 SG33 SG3320 SG46 SG55 SE15 SE23 SE30 SE45 SC23 SC30 SC45
Performance P: Repeated positioning accuracy ±1μm U: Repeated positioning accuracy ±5μm
grade (Note 1) H: Repeated positioning accuracy ±3μm W: Repeated positioning accuracy ±10μm
Screw shaft dia. (mm) 6 8 10 12 15 20 6 8 10 15 8 10 15
1 ◎ ◎
2 ◎ ● ◎ ◎ ● ◎ ●
4 ● ◎ ● ◎
Lead
5 ◎ ◎ ◎ ● ● ◎ ◎ ◎ ◎ ◎ ◎
(mm)
8 ● ●
10 ◎ ◎ ● ◎ ◎ ◎ ◎
20 ◎ ◎ ◎ ● ◎ ● ◎
◎：In-stock items ●：Manufactured by order
(Note 1) The above table shows precision information on repeated positioning accuracy in particular, as an example.
Performance of actuators may be different from the values shown above, depending on applied options and usage.
For other precision information, refer to description pages for each series.
(Note 2) SC series is a full-cover version of SE series ballscrew actuators.
For more information, refer to front matter 5, pages 6 and 89 to 105.
Frontmatter2
FEATURES OF SG/SE SERIES
■ No necessity for adjustment
Ballscrewandslideguideareintegratedinballscrewactuator, eliminatingtheneedforcomplicatedfineadjustmentandreducingthe
numberofworkingprocessestoagreatextent. F
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Housing o
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Guiderail
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Greasenipple
Slideblock
Dustcover
Ballscrewshaft
Couplingcover
Damper Dustproofcover
Sub-table
Motorbracket
■ High rigidity ■ High accuracy
With U-guide rail, rigidity of ballscrew actuator has remarkably Linearmotionunituses"4 or2 Ballwayof4 points-contact" struc-
improveddespiteofitscompactstructure, makingitpossibleto turetoassurehighrigidity. Guiderail, slideblockandballscrew
beappliedeventoastructuresupportedatonlyoneend. shaftarepreciselyworked, makingaccuratepositioningpossible.
Gothic arch shape
4 points-contact structure
■ Space-saving
WithitsslideblocksetinU-guiderail, theactuatorhasachievedlow-profiledesignandcompactshape, makingitpossibletoconsider-
ablyreducenecessaryspaceascomparedwithusualtabletypestructure.
SG series SE series (Unit: mm)
SG55
SG46 SE45
SG33
SE30
SG26
SE23
SG20
SE15
0 0
1 1
10 40（SG20） 10 30（SE15）
50（SG26） 50.5（SE23）
60（SG33） 60.5（SE30）
86（SG46） 86.5（SE45）
100（SG55）
Frontmatter3
KEY COMPONENTS AND MATERIALS OF SG AND SE SERIES
⑦
③
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⑤
②
⑫ ⑨ ⑩
⑪
①
No. Partname Material Remarks
① Motorbracket Aluminumalloy Anodizedtreatmentorbakingfinish
② Couplingcover Aluminumalloy Anodizedtreatment
Stainlesssteel(SG20, SG26) Blackcoating(Note1)
③ Guiderail
Carbonsteel (SG33, SG46, SG55, SE15, SE23, SE30, SE45)
④ Dustcover Aluminumalloy Anodizedtreatment
Chromium-molybdenumsteel(SGseries)
⑤ Ballscrewshaft
Carbonsteel(SEseries)
⑥ Slideblock Chromium-molybdenumsteel
⑦ Housing Aluminumalloy Anodizedtreatmentorbakingfinish
⑧ Greasenipple Stainlesssteel
⑨ Damper(Note2) Syntheticrubber
⑩ Dustproofcover Aluminumalloy Anodizedtreatment
⑪ Sub-table Aluminumalloy Anodizedtreatment
Aluminumalloy(SG20, SG26, SE15, SE23, SE30, SE45) Anodizedtreatment
⑫ Intermediate flange
Carbonsteel (SG33, SG46, SG55) Blackcoating
(Note1) Guiderailsmadefromstainlesssteelarenotsurface-treated.
(Note2) DamperpositionofSGseriesisdifferentfromSEseries. Formoreinformation, refertodimensionsofeachseries.
(Note3) Stainlesssteelisusedforboltsandmachinescrewstojointcomponentsofactuator.
① ⑥ ② ③ ⑤
No. Partname Material Remarks
① Motormountingplate Rolledsteel Blackcoating
② Tensionplate Stainlesssteel
Stainlesssteel(SGseries) Anticorrosiveblackcoating(Note4)
③ Pulleycover
Cold-rolledsteelplate(SE/SCseries)
④ Timingbelt Resin
⑤ Timingpulley Aluminumalloy
⑥ Tension bolt Stainlesssteel
④ (Note4) AnticorrosiveblackcoatingofpulleycoverappliestoSEandSC
series.
Frontmatter4
FEATURES OF SC SERIES (FULL-COVER TYPE)
Full-covertypeSCseries, builtonKURODASEseries, hasremarkablyimproveditsdust-preventiveperformance.
Structure Coupling cover Table Center sheet
Side cover
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Side cover
Table cover Central grease filler hole
Motor bracket Guide rail
Housing
■ Remarkably improved dust prevention!
ComparedtoSEserieswithdustproofcover, dustpreventionhasbeenremarkablyimprovedthroughmakingclearanceonsidefaceof
actuatorasnarrowasitcanbeandeffectivelyapplyingnewcentersheetdesignedtostraddlethetables, soastoprevententryofdust.
Center sheet Table
Centersheetisaflexiblestainlesssheethavingastructure
Sheet magnet is used for attracting Table cover
tokeepitspositionandtopreventitfrombeinglifted. center sheet to keep its position.
Clearance on side face
Side cover
(both sides)
Guide rail
Table
For further improved dust prevention, a wiper can be Table cover Table Table cover
optionallyequippedsothatagapbetweenbottomoftable Wiper
coverandsidecover/centersheetisfilled.
Center sheet Wiper
Side cover
(both sides)
Guide rail Guide rail
■ Down-sized body meeting space-saving needs!
SCserieshasfull-covertypebodywiththesamewidthanddimensionsasSEseries' guiderail.
ReplacingSEserieswiththefull-covertypeSCseriesrequiresjustthesamemountingspace(width) asSEseries(Notethatmounting
heightisdifferent).
■ Easy maintenance!
Inorderformoreefficientgrease-upwork, whichisusuallyfoundcumbersome, acentralgreasefillerholeisprovidedonthesideface
ofthetable, asstandardequipmentofSCseries.
Supplyinggreasetoballscrewsandguidepartscanbecompletedatatimethroughthecentralgreasefillerhole. (Aplugisequipped
withstandardspec. model).
Greasenippletobeattachedtogreasefillerholeisavailableasanoption. (Formoreinformation, refertopages96, 100, and104.)
■ Guide with remarkable rigidity!
HavingsteelU-guiderailssimilartoSG/SEseries, SCseriesshowshighrigiditydespiteofitscompactstructure, anditcanbeapplied
toastructuresupportedbyoneend. (Formoreinformation, refertofrontmatter11.)
Frontmatter5
KEY COMPONENTS AND MATERIALS OF SC SERIES
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⑤
⑥
①
⑦
③
⑧
No. Partname Material Remarks
① Motorbracket Aluminumalloy Anodizedtreatment
② Couplingcover Aluminumalloy Anodizedtreatment
③ Guiderail Carbonsteel Blackcoating
④ Sidecover Aluminumalloy Anodizedtreatment
⑤ Table Aluminumalloy Anodizedtreatment
⑥ Tablecover Syntheticresin
⑦ Centersheet Stainlesssteel
⑧ Housing Aluminumalloy Anodizedtreatment
(Note1) BallscrewsusedforSCserieshavethesamespecificationsasSEseries.
(Note2) Stainlesssteelisusedforboltsandscrewstojointcomponentsofactuator.
Frontmatter6
VARIATIONS OF SLIDE BLOCK
Twotypesofactuatorwithlongblockandshortblockareavailable. Additionaltypeswitheither2 longblocksor2 shortblocksarealso
available. Appropriatetypecanbeselectedfromthevariationsaccordingtoyourpurposeofuse.
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● With 1 long block: A t
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AppliedtoSG, SE, andSCseries. Mountingdatumsurface atte
r
Greasenipplemountingposition
● With 2 long blocks: B
AppliedtoSGandSEseries. (NotavailableforSCseries.)
Thisconfigurationmaynotbeapplicabledependingonguideraillength.
Mountingdatumsurface
Formoreinformation, refertodimensionsofeachseries.
Greasenipplemountingposition Greasenipplemountingposition
Drivenblock Drivingblock
● With 1 short block: C
ApplicablesizeinSEseries: SE45
ApplicablesizeinSGseries: SG33, SG46
Mountingdatumsurface
(NotavailableinSCseries.)
Greasenipplemountingposition
● With 2 short blocks: D
ApplicablesizeinSEseries: SE45
ApplicablesizeinSGseries: SG33, SG46
Mountingdatumsurface
(NotavailableinSCseries.)
Greasenipplemountingposition Greasenipplemountingposition
Drivenblock Drivingblock
Frontmatter7
SUMMARY OF ACCURACY INDICATORS
Performanceofballscrewactuatorsareshownusingvariousaccuracyindicatorsdescribedbelow.
Fordetailsintoleranceoftheaccuracyindicators, refertotableofperformance(accuracy) informationforeachseries.
r
e
att ● Repeated positioning accuracy
m
nt Repeat positioning of slide block in the same direction 7 times,
o
r measurestoppositionofslideblockandhalvemaximumdifference
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between obtained readings. Perform this measurement at the cen-
ter and both ends of travel distance. Maximum value among
obtainedvalueisusedasmeasuredvalue.
Repeatedpositioningaccuracy
＝±1/2 ((maximumvalueof n) - (minimumvalueof n))
● Positioning accuracy
Position slide block properly in a fixed direction and use the
e
obtainedpositionasdatumpoint. Performpositioningofslideblock e anc
in the same direction and measure difference between actual trav- anc dist
elingdistanceofslideblockfromdatumpointanddistanceordered st g
to be traveled from datum point. Perform this measurement g di ellin
thrPoousgihtioountinsgtraockceurraancgye＝a(nΔdusne) mmaaxximumvalue. Actual travelinof slide block - Ordered trav Travelling distance
● Traveling parallelism B
Fixindicatoratthecenterofslideblockandapplyittosurfaceplate
Traveling parallelism B
equippedwithguiderail. Moveslideblockthroughouttravelingdis-
tanceandusemaximumdistanceamongreadingsoftestindicator
asmeasuredvalue.
● Backlash
Moveslideblockbyrotatingballscrewshaftandreadtestindicator
whenslideblockisslightlymovedanduseitsreadingasreference
Backlash
value. Moveslideblockfromthisstateinthesamedirectionbypres-
suring prescribed load and measure difference between reading of Return
test indicator with load removed and reference value. Perform this Load
Move feed screw displacement
measurementatthecenterandbothendsoftravelingdistanceand
usemaximumvalueasameasuredvalue.
Backlash＝Δ
・Firmly tighten the fixed part and connection of the
ballscrewactuator.
Impropermountingofthebodymayadverselyaffectsafety
andaccuracydependsonthecircumstances.
Frontmatter8
REFERENCE DATA ON ACCURACY
ACCURACY OF UNIT PRODUCT
F
r
o
● Lost Motion n
t
m
Perform positioning in a positive (or negative) direction and mea-
a
sure the position ( 1). Move the slide block in the same direction tte
r
and perform positioning in a negative (or positive) direction and
measuretheposition( '). Moveitfurtherinthesamedirectionand
1
thereafter repeat the procedure in the positive and negative direc-
tions seven times each. Obtain the differences of the average val-
ues of the stop positions. Conduct this measurement for the entire
movingrangeandusetheobtainedmaximumvalueasameasured
value.
● Traveling Parallelism A
Inthecaseofballscrewactuators:
Setdialgaugeonsurfaceplate, fixindicatorontopofslideblock,
obtainthemaximumdifferenceofdialgaugereadingsinmeasur-
ablemovingrangeinlongitudinaldirectionofslideblock. Anduseit
asameasuredvalue. Sincethemeasurablerangeissmallfor
ballscrewactuators, TravelingParallelismBisusedasthemea-
surementmethodforallofthecasesexceptforafewexceptions.
InthecaseofX-Ystages:
Set dial gauge on surface plate, fix indicator at the center of table,
obtain the maximum difference of dial gauge readings in entire
movingrangeinX-Ydirection. Themaximumdifferenceisusedas
ameasuredvalue.
Frontmatter9
Description:For more information, refer to front matter 5, pages 6 and 89 to 105. Ball screw and slide guide are integrated in ballscrew actuator, eliminating the
