Contents

Assembly PrinciplesAssembly Principles Mounting & Alignment of Ball Screws

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Ball Screw Mounting Demo Table

Carriage with aligned and fixed runner blocks

Base plate with aligned and fixed rails

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aligned and fixed rails

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Ball Screw Mounting Demo Table

Fixed end with SEB-F pillow block

Single nut FSZ E S 32x5Single nut FSZ-E-S 32x5 mounted in MGS nut housing

Float end machining gfor SEB-L pillow block

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Nut Housing Mounting

Th t h i i t d ith th h th t fl d The nut housing is mounted with screws through the nut flange and into threaded holes in the nut housing.

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Fixed Bearing Lock Nut

Preload is set on the fixed bearing with the lock nut.

Tighten the lock nut to 2x the published tightening torque Ma, then back off to 1x Ma.

Required tools:q1. Hook wrench2. Allen wrench

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Fixed Bearing Threaded Ring

The fixed bearing is mounted in the pillow block using a threaded ring.

Use Loctite to prevent loosening.

Required tools: Spanner wrench

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Float End Mounting

SEB-L pillow block assembly

Pillow Bl kassembly

Snap Ring

Block Housing

BearingSnap Ring

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Float End Mounting

Th b i t ti b h t d ith b i The bearing must sometimes be heated with a bearing warmer before it will slide onto the ball screw shaft.

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Float End Mounting

Slide the floating bearing onto the ball screw shaft and secure with a snap ringsnap ring.

Snap Ring PliersSnap Ring Pliers

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Float End Mounting

Slide the floating bearing housing onto the table. Finger tighten the fastners in placefastners in place.

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Fixed Bearing Mounting

Attach the fixed bearing housing onto the table. Finger tighten the mounting screws

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Nut Housing and Carriage Plate

Move nut housing and carriage plate to extreme fixed end

Finger tighten the nut housing to the carriage plateto the carriage plate.

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Float End Mounting

Move the carriage all the way towards the float end and torque the fasteners on float end pillow block in place.

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Fixed End Mounting

Move the carriage all the way towards the fixed end and tighten the mounting screws on the fixedthe mounting screws on the fixed end pillow block.

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Ball Nut Alignment Check

Using a feeler gauge, check to see that there are no clearances between the ball nut flange and the nut housing.

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Carriage Plate Clearance Check

Also using the feeler gauge, make sure that the clearance between the nut housing and thebetween the nut housing and the carriage is less than or equal to .002”.

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Nut Housing Mounting to Carriage Plate

Tighten the screws to mount the nut h i t th ihousing to the carriage.

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Alternate Method for Ball Screw Alignment

Dial Indicator for Height Deviation

Gauge pad

Dial Indicator for Lateral DeviationDial Indicator for Lateral Deviation(Gauge pad not visible)

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Ball Screw Assembly Gauge Pad

Ball screw assembly gauge pads are used to align the ball screw Ball screw assembly gauge pads are used to align the ball screw

Self alignment (pivot)

Allow for larger contact surface so that it does not interfere with the thread geometry

Gauge pads can be ordered through Bosch Rexroth PN: R3305 131 19(L th 33 f l d 20 )(Length 33mm for lead <20mm) PN: R3305 131 21(Length 50mm for lead >20mm)

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Detailed View of Rolled Screw (ex.: 32x20)

Rolled Screws:Manufactured by Cold forming process Post-hardening by induction

Screw Thread

Compensation GGroove

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Alternate Method for Ball Screw Alignment

S d i li t Screw drive alignment consideration based on Y plane (Lateral)

Z l (H i h ) Z plane (Height)

Alignment to be done with use of dial indicator scaled at 1/100

Dial indicators mounted on magnetic indicator stand. Fixed to runner block

(master side)

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Alternate Method for Ball Screw Alignment

Measuring position: Middle of ball screw

Height deviation expected (Z plane) Ball screw is sagged slightly

due to it’s own weight

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Alternate Method for Ball Screw Alignment

Block size determined maintaining same height off of Fixed Bearingsame height off of Fixed Bearing reference point.

Parallel gauge block for support of middle segment of screw

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Alternate Method for Ball Screw Alignment

Measuring position: Floating bearing side

Height deviation (Z Plane) Screw has same dimension as

fixed end Lateral deviation (Y Plane)

Screw has some deviation Adjustment required

24 Linear Motion and Assembly Technologies | Gingerich Kevin | Abteilung | © Robert Bosch GmbH 2010. Alle Rechte vorbehalten, auch bzgl. jeder Verfügung, Verwertung, Reproduktion, Bearbeitung, Weitergabe sowie für den Fall von Schutzrechtsanmeldungen.

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