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  • Helpful application examples for mechanical engineers.

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  • Online application library with a range of ideas for all manufacturing industries.
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SNS: 

No.000156 Dual Centering Mechanism

Two parallel hands using two-tier rack and pinion.

Linear Guide

Product name Linear Guides - Heavy Load
Part number SX2R24-280
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

It has the suitable radial clearance and accuracy.

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Available sizes

■Linear Guides - Heavy Load

Material Hardness
Carbon Steel (Alloy Steel including SCM) 58HRC-

■Sizes and Dimensions

Number of Blocks Block Width Block Length Overall Height Rail Length
Standard With Lubrication Units
1 34 57 66.6 24 100-1480
42 67 76.6 28 160-1960
48 83 92.6 33 160-1960
52 57 66.6 24 100-1480
59 67 76.6 28 160-1960
73 83 92.6 33 160-1960
2 34 57 x 2 pcs. 66.6 x 2pcs. 24 160-1480
42 67 x 2 pcs. 76.6 x 2pcs. 28 220-1960
48 83 x 2 pcs. 92.6 x 2pcs. 33 220-1960
52 57 x 2 pcs. 66.6 x 2pcs. 24 160-1480
59 67 x 2 pcs. 76.6 x 2pcs. 28 220-1960
73 83 x 2 pcs. 92.6 x 2pcs. 33 220-1960

* Please see the product pages for details of selectable sizes.

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Selection Steps

■Miniature linear guide selection steps

Determine Operating Conditions.
(Moving mass, feed rate, motion pattern, life).

Temporary selection of linear guide specifications.
(Temporarily select block type,
Interim selection of overall height and rail length is made.)

Basic safety check
  • Allowable Load
  • Operating Life
  • Preload

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Accuracy Info

■Preload and accuracy standards (Normal clearance type)

Normal Clearance Type.

Overall Height Radial Clearance (µm)
24 -4-+2
28 -5-+2
33 -6-+3
Dimensional Accuracy (µm) Standard Grade High Grade
H Dimension Tolerance ±100 ±40
Pair variation of H 20 15
Tolerance of dims. W2 ±100 ±20
Pair variation of W2 H24・28 20 15
H33 30

■Running Parallelism

(μm)

Rail Length(mm)
81-250 251-400 401-500 501-630 631-800 801-1000 1001-1250 1251-1600 1600-2000
High Grade 7 8 9 11 13 14.5 16
Standard Grade 7 12 14 18 21 23 25 27 28.5

*The slight clearance type has clearances (play) between the rail and blocks.

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Performance info.

■Rated Load of Linear Guides for Heavy Load (Normal Clearance Type)

Overall Height Basic Load Rating Allowable Static Moment
C (Dynamic) kN C 0 (Static) kN MA・MB
N・m
Mc
N・m
24 8.6 14.2 69.0 98.0
28 12.5 21.3 155.0 232.0
33 20.2 34.5 275.0 393.0

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Technical Calculations

Operating Life Calculation for Linear Guides.

Operating Life.
When the linear system is in motion with applied load, the rolling surfaces and races are subject to repeated stress. This stress can cause scale-like flaking due to material fatigue. The total run distance until the flaking appears in the "Life" of the linear system.
Rated Life.
Rated life is the total travel distance that 90% of linear guides of the same type can reach, under the same conditions, with no occurrence of flaking damage. Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear guides, as shown below.
Load must be calculated before actually using linear guides. To obtain loads during linear reciprocating motion, it is necessary to fully consider vibrations and impacts during motion as well as distribution condition of the load applied to linear guides. So, it is not easy to calculate the loads. Operating temperature also critically affects the life. Considering these conditions, the above-mentioned calculation formula will be as follows.
  • L: Rated Life (Km)
  • fH: Hardness Factor (See Fig.1)
  • fT: Temperature Factor (See Fig.2)
  • fC: Contact Factor (See Table-1)
  • fW: Load Factor (See Table-2)
  • C: Basic Dynamic Load Rating (N)
  • P: Applied Load (N)
Hardness factor (fH)

For linear applications, the shafts and ball bearings must have sufficient hardness. If they do not, the load rating decreases and the life will be reduced.
Please correct the rated life with the hardness factor.

Temperature factor (fT)

When the temperature of the linear system exceeds 100 degrees C, the hardness will decrease and as a result, the allowable load and life will reduced.
Please correct the rated life with the temperature factor.
* Please use linear guides within temperature shown on product pages.

Contact factor (fC)

Table-1. Contact Factor

Number of blocks per rail Contact factor fC

1 1.00
2 0.81
3 0.72
4 0.66
5 0.61

In general, it is common to use two or more blocks on one rack. In these cases, the load on each block will vary depending on the machining precision and will not have equally distributed loads. As a result, the allowable load per block will vary depending on the number of blocks used on rail. Please correct the rated life with the contact factors on Table-1.

Load Factor (fW)

Table-2. Load Factor

Condition of Use fw
No shocks / vibrations,
low speed: 15 m/min. or less
1.0-1.5
No significant shocks / vibrations,
medium speed: 60 m/min. or less
1.5-20
With shocks / vibrations,
high speed: 60 m/min. or more
2.0-3.5

To calculate the load applied to the linear guides, in addition to the object weight, the inertia force attributed to the motion velocity, moment loads and the variations of each over time must be obtained. However, for reciprocating motion applications, it is difficult to obtain accurate calculations due to effects of the vibrations and shocks. Therefor, use Table 2 to simplify the life calculations.

Applied Load P Calculation Method
When moment load is applied to each block, convert the moment load into applied load using the following formula.
  • P: Applied Load (N)
  • F: Downward Load (N)
  • C0: Static Load Rating (N)
  • MA: Allowable Static Moment - Pitching Direction (N·m)
  • MC: Allowable Static Moment - Rolling Direction (N·m)
  • Lp: Load Point Distance (m) in Pitching Direction
  • Lr: Load Point Distance (m) in Rolling Direction

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Stopper Bolts

Product name Stopper Bolts- Hexagon Socket, Fine Thread
Part number STRC8-35
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

Prevent the linear guide from overrunning.

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Available sizes

■Stopper Bolts- Hexagon Socket, Fine Thread

Material Hardness Surface Treatment
4137 Alloy Steel 40-45HRC Black Oxide
Electroless Nickel Plating
410 Stainless Steel

■Sizes and Dimensions

Screw Dia.
(Coarse)
Screw Dia.
(Fine)
Length in 5 mm increments
M3x0.5 10-30
M4x0.7 M4x0.5 15-60
M5x0.8 M5x0.5 15-60
M6x0.75 M6x0.75 20-60
M8x1.25 M8x0.75 25-60
M10x1.5 M10x1.0 30-70
M12x1.75 M12x1.0 35-80

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IDEA NOTE Anti-backlash Design

Elongated holes are made on one side and tapped holes are made on the other side in order to change the rotation speed slightly to reduce backlash.

IDEA NOTE Linear guides are used to guide the racks.

The linear guides are used as guides for the racks and the parallel hands.

  • TERMS AND CONDITIONS FOR USE OF CAD DATA
    Your access to the CAD data that MISUMI Corporation (hereinafter referred to as the Company) posts on this site (including 3D CAD data, intermediate 3D CAD data and 2D CAD data; hereinafter referred to as the Data) are of products manufactured and/or sold by the Company (hereinafter referred to as the Products) assumes that you have read and accepted these terms and conditions which govern your use of the Data. If you do not agree to these terms and conditions, you must stop using this website and the Data. You must not use the Data for any unlawful purpose or in any manner inconsistent with these terms and conditions.
    1. CAD Data
    The Data is prepared for assisting the Company's users in the CAD design process by providing dimensions and other Product information. In order to provide the best speed and stability working within this site, the Product drawings were simplified to reduce the size of the Data. For instance, some of the Products are shown without the oil groove shape, screws or spring shape. Also, please be aware that the tolerance, surface roughness and/or chamfer of the Data may vary from the actual Products.
    2. Disclaimer on Data
    While the Company has carefully prepared the Data, accuracy of the Data is not guaranteed and is subject to the variances as described above. The Company may also modify, add or delete the Data at any time without prior notice. The Company assumes no liability for any direct, indirect, consequential or special damages that you may claim resulted from your use of the Data or any changes to or deletions of the Data regardless of the reason. The Company provides no warranty as to the quality, accuracy, functionality, safety or reliability of the combination of Products and parts. Example applications and combinations of the Products are provided for illustrative purposes only.
    3. Copyright
    Copyrights to the content and the Data belong to the Company or the manufacturers of the Products. The said copyright is protected by the Copyright Act and international treaties. The use (including duplication, modification, uploading, posting, transmission, distribution, licensing, sales and publishing) of the Data except for the purpose to use the Data described above without prior approval of the Company is not allowed. The Data cannot be used for any purposes (including sales promotion) except for designing your machine. If you violate this provision or the laws or regulations, the Company may prohibit you from the use of the Data, the Company’s site and/or take legal action. So long as you comply with these terms and conditions, the Company grants to you a non-exclusive, non-transferable, revocable license to access and use the Data for the sole purpose of assisting you in designing machines that incorporate products.
    In case that the CAD data is found to have been to be used for any purpose other than mentioned above or against the related laws, MISUMI may take legal actions, including the one for blocking the involved user from using CAD data and from accessing to the MISUMI site.
    4. Disclaimer of Warranty
    ANY AND ALL CONTENT APPEARING ON THIS WEB SITE IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. THIS WEB SITE, ITS CONTENT AND ITS LINKS ARE PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS AND ARE USED ONLY AT YOUR SOLE RISK, TO THE FULLEST EXTENT PERMISSIBLE BY LAW. THE COMPANY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF ANY KIND, REGARDING THIS WEB SITE (INCLUDING ITS CONTENT, HARDWARE, SOFTWARE AND LINKS), INCLUDING AS TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, TITLE, NON INFRINGEMENT, RESULTS, ACCURACY, COMPLETENESS, ACCESSIBILITY, COMPATIBILITY, SECURITY AND FREEDOM FROM COMPUTER VIRUS. THE COMPANY WILL NOT BE LIABLE FOR ANY DAMAGES OR LOSSES, INCLUDING DIRECT, INDIRECT, CONSEQUENTIAL, SPECIAL, INCIDENTAL OR PUNITIVE DAMAGES AND/OR LOST PROFITS, IN CONNECTION WITH USE OF THE INTERNET, THIS WEB SITE, ITS CONTENT OR ITS LINKS
    Further, the Company will not be liable to you for any failure or delay by the Company to provide access to the Data or any of its obligations under these terms and conditions where such failure or delay is the direct or indirect result of any circumstances beyond the Company's reasonable control (and the Company's obligations will be suspended for the duration of such circumstances).
    5. Policy of Third Parties
    You may be required to separately agree to third party's policies if you use third party software to create or browse the Data or use a third party’s CAD data. In this case, the Company does not assume any responsibility for defects of such CAD data or the software of the third party or violation of their rights. Understand them before use.

    CAD Download (Unit Assembly)

    CAD Download: File Format
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    Click the Good IDEA! button when you find interesting design tips.


    This data is utilized in order to list more useful application examples in the future.

    CAD Data Limitations

    1. Assembly data shows the assembly drawings in the concept design phase. The sole purpose of the data is to explain the structure and functionality of the assembly and is not considered nor to be used as a final design.
      You will need to edit the Data so that it meets your specific design conditions.
    2. Unit assembly Data consists of some sub-assemblies.
      It is configured so that each sub-assembly unit can be used as it is or edited.
    3. * The part in the frame is a sub-assembly unit.

    4. The Data for fabricated parts is based on easy-to-edit dimensions and shapes in sketches and histories.
    5. The dimensions of the MISUMI parts in the Data, which can be specifed at 1mm intervals, can be edited under historical data.
    6. The Data including the third-part components are made by the Company.

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  • * Unit assembly Data consists of some sub-assemblies.
       It is configured so that each sub-assembly unit can be used as it is or edited.

Application Overview

Purpose

  • The mechanism centers the workpieces using parallel hands operated by a rack and pinion set.
    Both sets of hands have a drive source and are operated independently. (Each workpiece placed/removed from the table by a robot)

Target workpiece

  • Shape: Nylon gear
    Size:φ141mm
    Weight: 1kg

Design Specifications

Operating Conditions or Design Requirements

  • Movable range of the hands: 60mm
  • External dimensions:w428×D575×H179mm

Required Performance

  • Weight of workpiece: 10N
    Weight of hands: 80N

Selection Criteria for Main Components

  • The maximum friction coefficient of the centering table is 0.2. Select a cylinder whose output is 100N or more to move the hands and the workpiece on the table.

Design Evaluation

Verification of main components

  • Compare and validate the load output and cylinder output
    • Calculation of the load output:
      Workpiece 10N×0.2 (friction coefficient)=2N
      Hands 80N×0.1 (friction coefficient)=8N, Total: 10N
      Cylinder out (=100N or more) > 10N=load output

Other Design Consideration

  • Design the two-tier pinion mechanism so it can be supported by one shaft.

Explore Similar Application Examples

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Part List

No. Part Name Sample Picture MISUMI Part Number
For Price and Days to ship click on Part No.
Quantity
1 Linear Guides SX2R24-280 2
2 Stopper Bolts STRC8-35 2
3 Dowel Pins MS5-10 4
4 Bearing Nut FUNT15 1
5 Ball Bearing B6902ZZNR 4
6 Deep Groove Ball Bearings B6902ZZ 2
  • The part list above only contains MISUMI parts.
    Part list download (CSV) includes MISUMI and third party components used in this example.
  • For price and shipping date see the Web Order System.
  • TERMS AND CONDITIONS FOR USE OF CAD DATA
    Your access to the CAD data that MISUMI Corporation (hereinafter referred to as the Company) posts on this site (including 3D CAD data, intermediate 3D CAD data and 2D CAD data; hereinafter referred to as the Data) are of products manufactured and/or sold by the Company (hereinafter referred to as the Products) assumes that you have read and accepted these terms and conditions which govern your use of the Data. If you do not agree to these terms and conditions, you must stop using this website and the Data. You must not use the Data for any unlawful purpose or in any manner inconsistent with these terms and conditions.
    1. CAD Data
    The Data is prepared for assisting the Company's users in the CAD design process by providing dimensions and other Product information. In order to provide the best speed and stability working within this site, the Product drawings were simplified to reduce the size of the Data. For instance, some of the Products are shown without the oil groove shape, screws or spring shape. Also, please be aware that the tolerance, surface roughness and/or chamfer of the Data may vary from the actual Products.
    2. Disclaimer on Data
    While the Company has carefully prepared the Data, accuracy of the Data is not guaranteed and is subject to the variances as described above. The Company may also modify, add or delete the Data at any time without prior notice. The Company assumes no liability for any direct, indirect, consequential or special damages that you may claim resulted from your use of the Data or any changes to or deletions of the Data regardless of the reason. The Company provides no warranty as to the quality, accuracy, functionality, safety or reliability of the combination of Products and parts. Example applications and combinations of the Products are provided for illustrative purposes only.
    3. Copyright
    Copyrights to the content and the Data belong to the Company or the manufacturers of the Products. The said copyright is protected by the Copyright Act and international treaties. The use (including duplication, modification, uploading, posting, transmission, distribution, licensing, sales and publishing) of the Data except for the purpose to use the Data described above without prior approval of the Company is not allowed. The Data cannot be used for any purposes (including sales promotion) except for designing your machine. If you violate this provision or the laws or regulations, the Company may prohibit you from the use of the Data, the Company’s site and/or take legal action. So long as you comply with these terms and conditions, the Company grants to you a non-exclusive, non-transferable, revocable license to access and use the Data for the sole purpose of assisting you in designing machines that incorporate products.
    In case that the CAD data is found to have been to be used for any purpose other than mentioned above or against the related laws, MISUMI may take legal actions, including the one for blocking the involved user from using CAD data and from accessing to the MISUMI site.
    4. Disclaimer of Warranty
    ANY AND ALL CONTENT APPEARING ON THIS WEB SITE IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. THIS WEB SITE, ITS CONTENT AND ITS LINKS ARE PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS AND ARE USED ONLY AT YOUR SOLE RISK, TO THE FULLEST EXTENT PERMISSIBLE BY LAW. THE COMPANY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF ANY KIND, REGARDING THIS WEB SITE (INCLUDING ITS CONTENT, HARDWARE, SOFTWARE AND LINKS), INCLUDING AS TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, TITLE, NON INFRINGEMENT, RESULTS, ACCURACY, COMPLETENESS, ACCESSIBILITY, COMPATIBILITY, SECURITY AND FREEDOM FROM COMPUTER VIRUS. THE COMPANY WILL NOT BE LIABLE FOR ANY DAMAGES OR LOSSES, INCLUDING DIRECT, INDIRECT, CONSEQUENTIAL, SPECIAL, INCIDENTAL OR PUNITIVE DAMAGES AND/OR LOST PROFITS, IN CONNECTION WITH USE OF THE INTERNET, THIS WEB SITE, ITS CONTENT OR ITS LINKS
    Further, the Company will not be liable to you for any failure or delay by the Company to provide access to the Data or any of its obligations under these terms and conditions where such failure or delay is the direct or indirect result of any circumstances beyond the Company's reasonable control (and the Company's obligations will be suspended for the duration of such circumstances).
    5. Policy of Third Parties
    You may be required to separately agree to third party's policies if you use third party software to create or browse the Data or use a third party’s CAD data. In this case, the Company does not assume any responsibility for defects of such CAD data or the software of the third party or violation of their rights. Understand them before use.

    CAD Download (Unit Assembly)

    CAD Download: File Format
    生成

    Thank you for downloading the data.

    Click the Good IDEA! button when you find interesting design tips.


    This data is utilized in order to list more useful application examples in the future.

    CAD Data Limitations

    1. Assembly data shows the assembly drawings in the concept design phase. The sole purpose of the data is to explain the structure and functionality of the assembly and is not considered nor to be used as a final design.
      You will need to edit the Data so that it meets your specific design conditions.
    2. Unit assembly Data consists of some sub-assemblies.
      It is configured so that each sub-assembly unit can be used as it is or edited.
    3. * The part in the frame is a sub-assembly unit.

    4. The Data for fabricated parts is based on easy-to-edit dimensions and shapes in sketches and histories.
    5. The dimensions of the MISUMI parts in the Data, which can be specifed at 1mm intervals, can be edited under historical data.
    6. The Data including the third-part components are made by the Company.

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