Schaeffler Product catalogue - medias
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Six-row linear recirculating ball bearing and guideway assemblies
Accuracy
   

Accuracy classes

 

Six-row linear recirculating ball bearing and guideway assemblies are available in accuracy classes G1 to G4, Figure 1. The standard is class G3.

 
   

Figure 1
Accuracy classes
and parallelism tolerances
of guideways

t = parallelism tolerance
with differential measurement
l = total guideway length
Medias/00015D1F_mei_in_0k_0k.gif Locating face

 

imageref_575015563_All.gif

 

Parallelism of raceways
to locating surfaces

 

The parallelism tolerances
See
Running accuracy
Dimensional accuracy
of guideways are shown in Figure 1

 
 

In systems with Corrotect® coating, there may be deviations in tolerances compared with uncoated units.

 
   

Tolerances

 

Tolerances: see table; datum dimensions for accuracy: see Figure 2

 
 

The tolerances are arithmetic mean values. They relate to the centre point of the screw mounting or locating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
of the carriage.

 
 

The dimensions H and A1 (table) should always remain within the tolerance irrespective of the position of the carriage on the guideway.

 
   
Table 1
Tolerances of accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
classes
 

Tolerance
Accuracy
G1
G2
G31)
G4
μm
μm
μm
μm
Tolerance for height
H
±10
±20
±25
±80
Height difference2)
ΔH
5
10
15
20
Tolerance for spacing
A1
±10
±15
±20
±80
Spacing difference2)
ΔA1
7
15
22
30

 
 
______
 1    Standard accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
class.
 
 
 2    Difference between several carriages on one guideway, measured at the same point on the guideway.
 
   

Units with Corrotect® coating

 

For these units, the values for the appropriate accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
class must be increased by the values for RRF or RRFT; for values, see table.

 
   
Table 2
Tolerances for coated parts
 

Tolerance
With Corrotect® coating
With Protect A coating
With Protect B coating
RRF1)
RRFT2)
KD
KDC
μm
μm
μm
μm
Tolerance for height
H
+6
+3
+6
+6
Height difference3)
ΔH
+3
0
+3
+3
Tolerance for spacing
A1
+3
+3
+3
+3
Spacing difference3)
ΔA1
+3
0
+3
+3

 
 
______
 1    Displacement in tolerance zone (guideway and carriage coated).
 
 
 2    Displacement in tolerance zone (guideway only coated).
 
 
 3    Difference between several carriages on one guideway, measured at the same point on the guideway.
 
   

Figure 2
Datum dimensions for accuracy


 

imageref_575017739_All.gif

 
   

Positional
and length tolerances
of guideways

 

The positional and length tolerances
See
Running accuracy
Dimensional accuracy
are shown in Figure 3 and the table.

 
 

The hole pattern corresponds to DIN ISO 1101.

 
   

Figure 3
Positional and length tolerances
of guideways


 

imageref_522391307_All.gif

 
   
Table 3
Length tolerances
See
Running accuracy
Dimensional accuracy
of guideways
 

Tolerances
of guideways,
as a function of length lmax1)
on multi-piece guideways
Guideway length
mm

mm
≦1000
>1000
<3000
>3000
–1
–1,5
±0,1%
of guideway length
±3
over total length

 
 
______
 1    Length lmax: see dimension tables.
 
   
Table 4
Pieces of joined guideways
 

Guideway length1)
Maximum permissible number of pieces
 mm
<3 000
2
3 0004 000
3
4 0006 000
4
>6 000
4 + 1 piece per 1 500 mm

 
 
______
 1    Minimum length of one piece = 600 mm.
 
   
  
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