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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rtesy
of C
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Con
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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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rtesy
of C
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/Hyd
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Mot
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Con
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Hyd
raul
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Ele
ctric
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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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rtesy
of C
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/Flo
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/Hyd
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Con
trol ▪
Hyd
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Ele
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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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of C
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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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rtesy
of C
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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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of C
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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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of C
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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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of C
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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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rtesy
of C
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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)
Cou
rtesy
of C
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/Hyd
rady
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trol ▪
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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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of C
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rady
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Mec
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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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of C
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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)
Cou
rtesy
of C
MA
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dyne
/Hyd
rady
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Mot
ion
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trol ▪
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ctric
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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
Cou
rtesy
of C
MA
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dyne
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rady
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Mot
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Con
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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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rtesy
of C
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/Hyd
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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.
Cou
rtesy
of C
MA
/Flo
dyne
/Hyd
rady
ne ▪
Mot
ion
Con
trol ▪
Hyd
raul
ic ▪
Pne
umat
ic ▪
Ele
ctric
al ▪
Mec
hani
cal ▪
(800
) 426
-548
0 ▪ w
ww
.cm
afh.
com