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- > No.000179 Centering Mechanism Utilizing Floating Joint
No.000179 Centering Mechanism Utilizing Floating Joint
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Correction of angular misalignment generated by the suction cup
Relevant category
Floating Joint
| Product name | Floating Connectors - Extra Short Threaded Stud Mount |
|---|---|
| Part number | FJCMXS6-1.0 |
| Features | Floating joint is used to compensate any misalignment between cylinder and moving object. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable for angular misalignment
Available sizes
■Floating Joint - Extra Short
| Body/Cover | Joints | Spring | Washer | |||||
|---|---|---|---|---|---|---|---|---|
| Material | Surface Treatment | Material | Surface Treatment | Hardness | Material | Material | Surface Treatment | Hardness |
| 1045 Carbon Steel | Black Oxide | 1045 Carbon Steel | Black Oxide | 35~45 HRC | 304 Stainless Steel | 304 Stainless Steel | Nitriding Treatment | 600HV~ |
| 304 Stainless Steel | - | 440C Stainless Steel | - | |||||
■Sizes
| Cylinder Mounting Side | Output | Allowable Lateral Misalignment | Allowable Angular Misalignment | Body Thickness | Body Hex Size | Overall Length | ||
|---|---|---|---|---|---|---|---|---|
| Thread Dia. - Pitch | Thread Length | Thread Dia. - Pitch | Thread Length | |||||
| M5-0.8 | 6 | M8-1.25 | 8.5 | 0.5 | 4° | 14 | 24 | 33 |
| M6-1.0 | ||||||||
| M8-1.25 | 8.5 | M10-1.5 | 10 | 15.5 | 27 | 39.5 | ||
| M10-1.5 | 10 | M14-2.0 | 11 | 19.5 | 30 | 47 | ||
Spring Plungers
| Product name | Spring Plungers - Stainless Steel |
|---|---|
| Part number | PJHK5-5 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Spring load and overall size
Available sizes
■Spring Plungers - Stainless Steel
| Nose Material | Load type | Body | Nose | Spring | Operating Temperature | |
|---|---|---|---|---|---|---|
| Material | Material | Hardness | Material | |||
| Stainless Steel | Ultra Light Load | 304 Stainless Steel | 440C Stainless Steel | 55HRC- | 631 Stainless Steel | -30~260℃ |
| Light Load | ||||||
| Heavy Load | ||||||
| Extra Heavy Load | ||||||
| Plastic | Ultra Light Load | Polyacetal | - | -30~80℃ | ||
| Light Load | ||||||
| Heavy Load | ||||||
| Extra Heavy Load | ||||||
■Sizes and Dimensions
| Screw Dia. (Coarse) | Nose | Body length | |
|---|---|---|---|
| Diameter | Stroke | ||
| M3 | φ1 | 1.5 | 15 |
| 3 | 15 | ||
| M4 | φ1.6 | 2 | 15 |
| 4 | 24 | ||
| M5 | φ2 | 3 | 20 |
| 5 | 27 | ||
| M6 | φ2.5 | 3 | 25 |
| 5 | 30 | ||
| M8 | φ3.1 | 3 | 25 |
| 5 | 27 | ||
| M10 | φ3.8 | 5 | 30 |
| 10 | 43 | ||
| M12 | φ5.5 | 5 | 30 |
| 10 | 43 | ||
| 15 | 51 | ||
| M16 | φ8 | 10 | 57 |
| 15 | 57 | ||
| 20 | 65 | ||
Performance info.
■Spring Load (N) of Spring Plunger (Stainless Steel)
| Load type | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Screw Dia. (Coarse) | Nose | Ultra Light Load | Light Load | Heavy Load | Extra Heavy Load | |||||
| Diameter | Stroke | min． | max． | min． | max． | min． | max． | min． | max． | |
| M3 | φ1 | 1.5 | 0.12 | 0.4 | 0.4 | 1.3 | 0.8 | 2.94 | 1.1 | 3.42 |
| 3 | 0.12 | 0.4 | 0.2 | 1.3 | 0.6 | 2.93 | 0.8 | 3.41 | ||
| M4 | φ1.6 | 2 | 0.27 | 0.65 | 0.9 | 2 | 2 | 8.8 | 6.1 | 13.8 |
| 4 | 0.18 | 0.65 | 0.6 | 2.1 | 1.9 | 8.75 | 5.8 | 13.6 | ||
| M5 | φ2 | 3 | 0.4 | 3 | 1.4 | 9.7 | 2.7 | 16.3 | 6.8 | 22 |
| 5 | 0.35 | 3 | 1.1 | 10.3 | 1 | 17.1 | 5.7 | 21.5 | ||
| M6 | φ2.5 | 3 | 1.8 | 3.05 | 6 | 9.8 | 8 | 26.4 | 15.8 | 35.6 |
| 5 | 1.5 | 3.05 | 3.4 | 9.86 | 4.4 | 26.6 | 12.9 | 34.4 | ||
| M8 | φ3.1 | 3 | 1.9 | 3.15 | 6 | 9.9 | 14.7 | 27 | 21.9 | 36.3 |
| 5 | 1.4 | 3.15 | 4 | 9.83 | 6.7 | 26.6 | 14.7 | 34.5 | ||
| M10 | φ3.8 | 5 | 1.6 | 4.6 | 5.7 | 14.7 | 8.2 | 45.7 | 24.5 | 58.6 |
| 10 | 1.6 | 4.6 | 4.4 | 14.7 | 6.2 | 45.1 | 19.8 | 58.7 | ||
| M12 | φ5.5 | 5 | 1.7 | 4.7 | 5.8 | 14.7 | 18.2 | 49 | 34.9 | 63.6 |
| 10 | 1.6 | 4.7 | 5 | 14.7 | 8.2 | 49.1 | 25.5 | 63.6 | ||
| 15 | 1.8 | 4.7 | 6.9 | 14.7 | 7.5 | 48.9 | 20.1 | 63.7 | ||
| M16 | φ8 | 10 | 2.8 | 10.8 | 9.2 | 34.2 | 18.9 | 68.5 | 38.7 | 88.4 |
| 15 | 2.6 | 10.8 | 8.6 | 34.4 | 14.4 | 68.6 | 33.9 | 88.1 | ||
| 20 | 2 | 11 | 7.1 | 34.4 | 4.2 | 68.6 | 25.4 | 88.1 | ||
* Min. is the initial load, and max. is the load when the nose is fully compressed.
Suction Cup Fittings
| Product name | Suction Cups - with Fitting, Spring Type, Shape K |
|---|---|
| Part number | MVPKN15 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable for lifting a workpiece from uneven surfaces
Available sizes
■Suction cup with fitting (With pad) Fixed type, Top tube connection: One touch type (Shape K)
| Body Material | Surface Treatment | Pad Shape | Pad Material |
|---|---|---|---|
| Brass | Electroless Nickel Plating | Standard | Nitrile Rubber |
| Conductive Silicon Rubber | |||
| Fluorinerubber | |||
| Deep type | Nitrile Rubber | ||
| Fluorinerubber |
■Sizes and Dimensions
| Pad Shape | Suction Cup | Connection Dia. | Overall Length | Mounting thread DIA. x Pitch | |
|---|---|---|---|---|---|
| O.D. | Length | ||||
| Standard | φ2 | 4 | φ4 | 28.3 | M6×0.75 |
| φ3 | |||||
| φ4 | |||||
| φ6 | 7 | φ6 | 32.6 | M10×1.0 | |
| φ8 | 5.5 | 31.1 | |||
| φ10 | 8 | 34.1 | M12×1.0 | ||
| φ15 | 9 | 35.1 | |||
| φ20 | 10 | 37.5 | M14×1.0 | ||
| Deep type | φ20 | 11 | 38.7 | ||
| φ25 | 12 | 39.7 | |||
| φ30 | 14 | 41.7 | |||
| φ40 | 17.5 | 45.2 | |||
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Application Overview
Purpose
- Purpose
- Correction of angular misalignment of workpiece.
- Operation
- Descend the arm so that the suction cups attach to a workpiece. The suction cup surface will follow the tilt of the workpiece because of the allowable angular misalignment tolerance of the floating joint. Once the workpiece is suctioned, lift the workpiece so that the angular misalignment is restored. Angular misalignment is restored by repulsive force of the spring plungers.
Target workpiece
- Shape: Flat plates such as circuit boards, etc.
- Size: W 200ｘL 200ｘH 0.8 mm
- Weight: 500 g
Design Specifications
Operating Conditions or Design Requirements
- Arm upper surface - Suction cup surface: 57 mm
- External size: W 341 x D 142 x H 58 mm
- Allowable lateral misalignment：0.5、allowable angular misalignment: 4°;
Required Performance
- Locating accuracy: ± 1 mm
Selection Criteria for Main Components
- Floating joint: Shall have lateral misalignment tolerance and angular misalignment tolerance.
- Suction cup: Shall not exceed the allowable weight of the floating joint.
Design Evaluation
Verification of main components
- Verify the suction force is sufficient to hold workpiece.
- Work retention weight
- Conditional values: maximum tension using force of the floating joint: F1 = 500N
Suction holder pad diameter: D = 1.5 cm
Vacuum level: P = - 60 kPa
Number of suction holders: n = 4 [pieces], Horizontal sling safety factor: f = 4, gravitational acceleration: g = 9.8 N/m2
Pad area: C = D2 x (π/4) = 1.77 cm2
Suction force per suction holder: W = {(C x P)/101} x 10.13 x (1/f) Thus, W = 2.66 N
Suction force with 4 suction holders: W' = 4 x W = 10.6 N - F1 >> W" Thus, sufficiently safe for the floating joint.
- Maximum weight of the workpiece = W' /g = 1.08 kg Thus, safe against workpiece weight of 500 g.
- Conditional values: maximum tension using force of the floating joint: F1 = 500N
Other Design Consideration
- The overall unit height can be reduced by using a floating joint.
- Roughness of cone-shaped plunger support may hinder level restoration and centering. Make sure the finish is Ra 1.6 or better.
Explore Similar Application Examples
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