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No.000141 Long Workpiece Retention Mechanism

Chucking mechanism that converts cylinder thrust to spring force

Related Category

Compact Cylinders

Product name Compact Cylinders
Part number MSCCA16-20
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

To use the limited long side space effectively.

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Available sizes

■Compact Cylinders Double Acting Standard Stroke Type

Tube I.D. External
Size
Rod Tip Screw Stroke St Body Length
(+ St shown below)
Rod
Tip
Length
Screw Type DIA.-Pitch
5 10 15 20 25 30 35 40 45 50 75 100
Ø12 □25 Tapped M3 x 0.5 - - - - - - 22 3.5
Ø16 □29 M4 x 0.7 - - - - - -
Ø20 □36 M5 x 0.8 - - 29.5 4.5
Ø25 □40 M6 x 1.0 - - 32.5 5
Ø32 □45 M8 x 1.25 - - 33 7
Ø40 □52 39.5
Ø50 □64 M10 x 1.5 - 40.5 8
Ø63 □77 - - - - - - - - 46
Ø12 □25 Thread M5 x 0.8 - - - - - - - - - 22 14
Ø16 □29 M6 x 1.0 - - - - - - - - - 15.5
Ø20 □36 M8 x 1.25 - - - - - - - - - 29.5 18.5
Ø25 □40 M10 x 1.25 - - - - - - - - - 32.5 22.5
Ø32 □45 M14 x 1.5 - - - - - - - - - 33 28.5
Ø40 □52 - - - - - - - - 39.5
Ø50 □64 M18 x 1.5 - - - - - - - 40.5 33.5
Ø63 □77 - - - - - - - - 46

* Sensors are sold separately.

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Selection steps

■Linear Bushings with Pillow Blocks Selection Steps

1. Define various conditions of the load.

2. Calculate the cylinder output. (in case of double-acting type)

3. Determine the tube I.D.

4. Determine the theoretical reference speed.

5. Verify the cylinder's cushion mechanism.

6. Verify the lateral load applied to the cylinder.

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Performance info.

Min. Operating Pressure (MPa): 0.1
Max. Operating Pressure (MPa): 1.0
Pressure Resistance (MPa): 1.5

■Theoretical Thrust

(N)

Tube
I.D.
Operation
Direction
Operating Pressure (MPa)
0.4 0.5
Ø12 Outstroke 45 57
Instroke 34 42
Ø16 Outstroke 80 101
Instroke 60 75
Ø20 Outstroke 126 157
Instroke 94 118
Ø25 Outstroke 196 245
Instroke 151 189
Ø32 Outstroke 322 402
Instroke 241 302
Ø40 Outstroke 503 628
Instroke 422 528
Ø50 Outstroke 785 982
Instroke 660 825
Ø63 Outstroke 1247 1559
Instroke 1121 1402

■ Allowable Lateral Load

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Round Wire Coil Spring

Product name Round Wire Coil Springs/Deflection 35%-40%/O.D. Referenced
Part number WT10-20
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

Designed to avoid cylinder thrust to be applied directly to workpiece.

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Available sizes

■Round wire coil spring

Material: JIS-SWP-A

■Sizes and Dimensions

Winding Dia. (mm) Free Length (mm) Load N (kgf)
8 10 7.8 (0.8)
15 11.8 (1.2)
20 15.7 (1.6)
25 19.6 (2.0)
30 23.5 (2.4)
35 27.5 (2.8)
40 31.4 (3.2)
45 35.3 (3.6)
50 39.2 (4.0)
55 43.1 (4.4)
60 47.1 (4.8)
65 51.0 (5.2)
70 54.9 (5.6)
80 62.8 (6.4)
10 10 7.8 (0.8)
15 11.8 (1.2)
20 15.7 (1.6)
25 19.6 (2.0)
30 23.5 (2.4)
35 27.5 (2.8)
40 31.4 (3.2)
45 35.3 (3.6)
50 39.2 (4.0)
55 43.1 (4.4)
60 47.1 (4.8)
65 51.0 (5.2)
70 54.9 (5.6)
80 62.8 (6.4)
13 15 11.8 (1.2)
20 15.7 (1.6)
25 19.6 (2.0)
30 23.5 (2.4)
35 27.5 (2.8)
40 31.4 (3.2)
45 35.3 (3.6)
50 39.2 (4.0)
55 43.1 (4.4)
60 47.1 (4.8)
65 51.0 (5.2)
70 54.9 (5.6)
80 62.8 (6.4)

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Performance info.

■Performance info. of Round Wire Coil Spring

Load N (kgf)
min. max.
2.9 (0.3) 125.5 (12.8)

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Technical calculations

■Round wire coil spring technical calculations

Load = Spring Constant x Amount of Deflection

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Linear Bushings

Product name Linear Bushings/Standard/Double
Part number SLMUW8G
Features The most standard type in linear ball bushing products.
* Orange colored cells in the table below indicate the part numbers used in this example.

Selection criteria

To enable smooth sliding of buffer.

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Available sizes

■Linear Bushing (Standard Double type)

Outer Cylinder Ball Retainer
Material Hardness Surface Treatment Material Material
EN 1.3505 Equiv. 58HRC - - EN 1.3505 Equiv. Plastic (Duracon M90 equivalent)
Stainless Steel (SUS)
Low Temp. Black Chrome Plating EN 1.4125 Equiv. Plastic (Duracon M90 equivalent)
Electroless Nickel Plating
Stainless Steel (SUS)
EN 1.4125 Equiv. 56HRC - - Plastic (Duracon M90 equivalent)
Stainless Steel (SUS)

■Sizes and Dimensions

I.D. (mm) Length (mm)
3 19
4 23
5 28
6 35
8 45
10 55
12 57
13 61
16 70
20 80
25 112
30 123
35 135
40 151
50 192

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Selection steps

■Linear bushing selection steps

Determination on Operating Conditions
(Loads, Motion pattern, Life hours)

Temporary selection of linear guide specifications
(Shaft dia. and length are temporarily selected according to the conditions of use.)

Basic safety check
  • ●Basic Static Load Rating
  • ●Basic Dynamic Load Rating
  • ●Allowable Static Moment
  • ●Operating Life

Considerations Based on Required Performance
●Life Variations Due to Temperature Changes

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Accuracy Info

■Accuracy Information of Linear Bushing

I.D.
(mm)
Tolerance
3 0
-0.010
4
5
6
8
10
12
13
16
20 0
-0.012
25
30
35 0
-0.015
40
50

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Performance info.

■Performance info. of Linear Bushings

I.D.
(mm)
Basic Load Rating
Basic Dynamic Load Rating (N) Basic Static Load Rating (N)
3 138 210
4 176 254
5 263 412
6 324 529
8 431 784
10 588 1100
12 657 1200
13 813 1570
16 1230 2350
20 1400 2740
25 1560 3140
30 2490 5490
35 2650 6270
40 3430 8040
50 6080 15900

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Technical calculations

■Life of Linear Bushing
When the linear system is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the repeated stress is applied on the rolling elements and the rolling contact surfaces constantly. Total travel distance until the first flaking occurs is called the life of linear system.
Rated life can be obtained from the Basic Dynamic Load Rating and the actual load applied on the linear bushings, as shown below.
  • L: Rated life (km)
  • fH: Hardness Factor (see Fig.1)
  • fT: Temperature Factor (see Fig.2)
  • fC: Contact Factor (See Table-3.)
  • fW: Load Factor (See Table-4.)
  • C: Basic dynamic load rating (N)
  • P: Applicable load (N)
●Hardness factor (fH)

Fig.1. Hardness Factor

For liner system applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.

●Temperature Factor (fT)

Fig.2. Temperature Factor

When the temperature of linear system exceeds 100°C, the hardness of the system and shafts will be reduced and the allowable loads will also be reduced compared to being used at room temperature, resulting in a shorter life.

●Contact Factor (fC)

More than two linear systems are used for one shaft in general. In this case, the load applied to each linear system varies depending on machining precision and is not uniformly distributed. As a result, allowable load per linear system changes depending on the number of linear systems used on one shaft.

Table-3. Contact Factor

Number of bearings installed on one shaft. Contact Factor fC
1 1
2 0.81
3 0.72
4 0.66
5 0.61
●Load Factor (fW)

To calculate load applied to the linear system, in addition to object weight, it requires inertia force attributed to motion velocity or moment loads. Further, it is necessary to accurately determine the temporal change of each. However, it is difficult to calculation the load accurately due to potential vibrations and shocks caused by other element than repeated start-stop motions during reciprocating motion. Therefore, use the table below in order to simplify the life calculations.

Table-2. Load Factor

Conditions of Use fw
No external shocks or vibrations and
speed is low 15m/min or less
1.0 ~ 1.5
No significant shocks or vibration and
med. speed 60m/min or less
1.5 ~ 2.0
External shocks and vibrations exist
and the speed is high 60m/min or over
2.0 ~ 3.5
Life in hours can be obtained by calculating the travel distance per hour. When the stroke length and the number of strokes are constant, it can be calculated using the formula below.
  • Lh: Life (Hr)
  • L: Rated Life (km)
  • Ls: Stroke Length (m)
  • n1: Number of cycles per minute (cpm)

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IDEA NOTE Chucking mechanism that converts cylinder thrust to spring force

As the cylinder strokes, the spring attached to the chuck unit is compressed and the workpiece is chucked by the spring force.

  • 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.
    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.

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    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. The CAD data unit assembly consists of sub-assemblies.
      Each sub-assembly unit can be used as it is or can be 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 CAD data consists of some sub-assemblies.
       Each sub-assembly unit can be used as it is or can be edited.

Application Overview

Purpose

  • Chucks and unchucks workpieces in a manner in which they do not deform.

Points for use

  • Cylinder employing automatic mechanism
  • Workpiece is transferred to the chucking position by another unit.
  • As the circumference of a workpiece is chucked in the next process, the workpiece is chucked at both ends in this process.
  • To reduce the abrasion powder as much as possible, a greased bushing is used.

Target workpiece

  • Outer dimensions: Ø10 x 275
  • Material: POM
  • Weight: 30g

Design Specifications

Operating Conditions or Design Requirements

  • Outer dimensions: W420 x D100 x H137 (when workpiece is unchucked)
  • Cylinder Stroke: 20mm

Required Performance

  • Clamping force: 10N

Selection criteria for Main Components

  • Round wire coil spring
    • Spring force of 10N or higher is exerted when it is compressed by 5mm.

Design Evaluation

Verification of main components

  • Select spring that withstands workpiece retention.
  • Compression spring load
    • Calculation formula: reaction force F = kx
    • Workpiece retention load: F = 10N
    • Set length: 15mm, free length: 20mm
    • Assumed deflection during workpiece retention: x = 5mm
    • From k = F / x = 10 / 5 = 2.0,
      Select spring with spring constant of: k = 2.0N/mm

Other Design Consideration

  • So that the workpiece is not affected, this mechanism chucks the workpiece at an appropriate.
    load by converting the cylinder thrust to the spring load.
  • A linear guide is employed to ensure the chuck positioning accuracy.

Explore Similar Application Examples

Page - / -

Part List

No. Part Name Sample picture MISUMI Part Number
For Price and Days to ship click on Part No.
Quantity
1 Linear Guides SSEB20-100 2
2 Air Cylinders MSCCA16-20 2
3 Sensors for Air Cylinders MD11L1 4
4 Flow Rate Control Valves SPJNLS6-M5-B 4
5 Floating Joints FJXLS6-1.0 2
6 Compression Springs WT10-20 1
7 Linear Bushings SLMUW8G 1
8 Retaining Rings STWN15 2
9 Collars FAMSC-V15-D19-L22.9 1
10 Metal Washers WSSM12-5-3 1
11 Metal Washers WSSM12-8-2 1
12 Dowel Pins MS4-10 8
13 Socket Head Cap Screws-with Washer SCBS4-16 8
14 Socket Head Cap Screws-with Washer SCBS6-20 8
  • The part list above contains only MISUMI parts.
    The list of parts and machined products of other manufacturers than MISUMI can also be downloaded by part list download (CSV).
  • You will find information on price and shipping days, in the Online Quote and 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.
    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 Data Download (Unit Assembly)

    CAD Data Download: File Format
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    Thank you for downloading the data.

    Click the Good IDEA! button when this application example is helpful.


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

    Cautions on the CAD data

    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. The CAD data unit assembly consists of sub-assemblies.
      Each sub-assembly unit can be used as it is or can be 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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