Linear Unit KRF 8 80x40 ZR, left-hand input shaft
0.0.641.21

Linear Unit KRF 8 80x40 ZR, left-hand input shaft

0.0.641.21

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Special features:
item products are based on different modular dimensions and their associated system grooves. Profiles from Lines 5, 6, 8, 10 and 12 each need corresponding sizes of fasteners. The profiles in Line X feature a Line 8 system groove but have a particularly flat surface with minimum curve radii that make them ideal for building sealed constructions.
Components that are RoHS-compliant contain no dangerous substances such as lead or cadmium. EC Directive 2002/95/EC (RoHS 1) restricts the use of certain substances in electronic devices and components. These include batteries, etc.
All substances are registered according to the REACH regulation. REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) ensures that users have accurate information on the type and properties of operating materials, lubricants, etc. that they might come into contact with.
Delivery unit
Scale limit
Price
1 pce.
≥1
on application

on application

More Product Information

  • Attributes
  • Details
  • Accessories
  • Downloads
  • Deflection calculator
  • Videos
  • Application
  • Classification
Linear Unit KRF 8 80x40 ZR, left-hand input shaft
0.0.641.21

Attributes

Line
line 8
Delivery Unit
1 pce.
Safety clearance
smin = 20 mm
Stroke max.
Hmax = 5760 mm
Max. speed
Vmax = 10 m/s
Max. acceleration
amax  = 10 m/s2
Repeat accuracy
. = 0.1 mm
Stroke
h = 145 mm/U
Frictional moment
. = 2 Nm
Max. drive torque
. = 23 Nm
Mass moment of inertia when stroke length = 0 mm
J0 = 1121 kg mm2
Mass moment of inertia per m of stroke
JH = 127 kg mm2/m
Mass moment of inertia per kg of payload
JN = 532.6 kg mm2/kg
Basic mass (when stroke length = 0 mm)
m1 = 5.119775 kg
Mass per mm of stroke
m2 = 4.699 g/mm
Total mass
m = m1 + H * m2
Maximum operating load
Fx max = 1000 N
Maximum force in direction y
Fy max = 2500 N
Maximum force in direction z
Fz max = 2500 N
Maximum moment around the x axis
Mx max = 50 Nm
Maximum moment around the y axis
My max = 140 Nm
Maximum moment around the z axis
Mz max = 140 Nm
Support width when Fz max.
.  = 1100 mm
Support width when Fy max.
.  = 500 mm
Weight per length of the drive medium (timing belt, chain)
mlz = 0.119 kg/m
Efficiency
. = 1
Moment of Inertia, x-axis
Ix = 95.62 cm4
Moment of Inertia, y-axis
Iy = 22.3 cm4
Resistance Moment, x-axis
Wx = 22.82 cm3
Resistance Moment, y-axis
Wy = 11.15 cm3
Weight
m = 5.119775 kg
Weight, spec. Length
m = 4.699 kg/m
Cross-sectional area
A = 15.58 cm2
Weight spec. length [g/mm]
m = 4.699 g/mm
Moment of Inertia, torsional
It = 18.31 cm4
Linear Unit KRF 8 80x40 ZR, left-hand input shaft
0.0.641.21

Details

The compact Roller Guide with the best load-to-size ratio of all item drive elements.
Light, quiet-running rollers arranged in a criss-cross pattern for high speed
Innovative track technology – high-strength steel tracks rigidly connected to the aluminium guide profile
Solid, rigid sliding carriage with a broad range of attachment options and integrated timing-belt clamp profile
Drive Unit with internal reversing mechanism to give the smoothest possible movement when working with low moving mass
Three Profile 8 grooves on three sides of the KRF guide profile ensure unbeatable flexibility for attachment geometries
Simple adjustment with minimum maintenance requirements, all elements externally accessible
Axes of customised length, guide length up to max. 6000 mm
Motors can be adapted using universal coupling elements in the Drive Set
Linear Unit KRF is augmented by a range of useful accessories that enable simple attachment of slide constructions and drive modules.
Eight rollers, arranged play-free in a criss-cross pattern, ensure maximum load-carrying capacity with compact size.
Load specifications
Simplified method for determining the maximum permissible load for the Roller Guides of a KRF:
Profile deflection
The maximum deflection, fmax of the system is governed by the dimension of the profile cross-section, the free profile length and the force applied. It should not exceed 1mm/m. The KRF profile must be given appropriate support if the linearity of movement has to be very precise.
The mass moments of inertia of the profile provide the basis for calculating the deflection:
Complete Linear Units with variable stroke length (H), Drive Unit and Reverse Unit, support profile with integrated Roller Guide on guide tracks, preset free of play. Timing-belt tensioning device integrated into Reverse Unit, ball-bearing-mounted pulleys.
Guide slide with eight-piece roller-bearing mounting, oil-lubricated roller contact (re-lubrication every 6 months or every 2500 km)
Acceleration: max. 10 m/s²
Stroke velocity: max. 10 m/s
Linear Unit KRF boasts exceptional precision and low-vibration linear movement. Repeat accuracy is ± 0.1 mm.
The mass of a Linear Unit KRF can be determined from the stroke length (without payload):
m = m1 + H x m2
Maximum possible acceleration in relation to moved mass and installation orientation
h = horizontal orientation
v = vertical orientation

Travel speed v in relation to input speed n (timing-belt drive)

Operational force Fx dependent on input torque M (timing-belt drives Fx > 500N)

Linear Unit KRF 8 80x40 ZR, left-hand input shaft
0.0.641.21

Accessoires / Service

item MotionSoft®
Delivery unit
1 pce.
Article-No.
0.0.675.15
Drive Set KRF 8 ZR
Delivery unit
1 set
Article-No.
0.0.627.46
Limit-Switch Holder KRF 8
Delivery unit
1 pce.
Article-No.
0.0.626.55
Track Oil for Linear Guides
Delivery unit
1 pce.
Article-No.
0.0.612.75
Oil Can for Linear Guides
Delivery unit
1 pce.
Article-No.
0.0.612.74
Proximity Switch 8 - 1NC
Delivery unit
1 pce.
Article-No.
0.0.600.05
Proximity Switch 8 - 1NO
Delivery unit
1 pce.
Article-No.
0.3.001.30
Drive Set KRF 8 ZR AP/WP 60
Delivery unit
1 set
Article-No.
0.0.673.31
Drive Set KRF 8 ZR AP/WP 80
Delivery unit
1 set
Article-No.
0.0.673.32
Proximity Switch Set KRF NO
Delivery unit
1 pce.
Article-No.
0.0.688.08
Proximity Switch Set KRF NC
Delivery unit
1 pce.
Article-No.
0.0.688.09
Synchronising Set KRF 8 80 ZR
Delivery unit
1 set
Article-No.
0.0.648.58
Tube D25x3 St, bright zinc-plated
Delivery unit
cut-off max. 6000 mm
Article-No.
0.0.609.83
Synchroniser Shaft Cover Set KRF 8 80 ZR
Delivery unit
1 set
Article-No.
0.0.648.59
Lid Profile D80 E, natural
Delivery unit
cut-off max. 3000 mm
Article-No.
7.0.002.73
Conduit Profile U 80x80 E, natural
Delivery unit
cut-off max. 3000 mm
Article-No.
7.0.002.74

Downloads

Assembly instruction(2 MB)

Deflection calculator

To determine the profile deflection around the Y-axis, please enter

The calculation already takes the deflection caused by the dead weight into account.

Load 1

load 1
Deflection f1x: 0 mm Bending stress σ1x: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.
Deflection f1y: 0 mm Bending stress σ1y: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.

Load 2

load 2
Deflection f2x: 0 mm Bending stress σ2x: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.
Deflection f2y incidental: 0 mm Bending stress σ2y: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.

Load 3

load 3
Deflection f3x: 0 mm Bending stress σ3x: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.
Deflection f3y incidental: 0 mm Bending stress σ3y: 0 N/mm² Warning! The bending stress exceeds the yield strength of the material.

Videos

item New Products Spring 2011

Ergonomic work bench systems, the new Line D30 and innovative enhancements for the MB Building Kit System -- Discover new ideas from item. A diverse range of possible applications, maximum product quality and impressive service make all the difference. item solutions are tried and tested and centred around customer requirements.

item MB Building Kit System New Products Spring 2011

Join us for a première - be among the first to experience the new Linear Unit KRF. By combining universal suitability with a compact, rigid design, this drive system truly stands out from the crowd. It comprises a high-performance Drive Unit, runs with an exceptionally low level of noise and has steel roller guides that make it ideal for heavy-duty applications.

Linear Unit KRF 8 80x40 ZR

The compact Roller Guide with the best load-to-size ratio of all item drive elements. Light, quiet-running rollers arranged in a criss-cross pattern for high speed. Innovative track technology - high-strength steel tracks rigidly connected to the aluminium guide profile.

Applications

Space-saving positioning system - Article EX-01008

This two-axis positioning system takes up very little space.

More information
PDF CAD Parts list
Linear Unit KRF 8 80x40 ZR, left-hand input shaft
0.0.641.21

Classifications

Classifications are industry-wide product data standards that are used, among other things, to support structured processing in ERP and e-business systems. Do you need the classification data for all item products for your e-procurement system? If so, please don’t hesitate to contact us.
eCl@ss 4.0
36400806
eCl@ss 4.1
36400701
eCl@ss 5.0
23329090
eCl@ss 5.1
23329090
eCl@ss 6.0.1
23301702
eCl@ss 7.1
23301702
eCl@ss 8.0
23301702
UNSPSC 7.0
26111506
UNSPSC 9.0
26111506
customs tariff number
84879090