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- > No.000283 Set-up Change Using Electromagnets
No.000283 Set-up Change Using Electromagnets
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Using electromagnets automatically locks the fixture after changing the fixture set-up.
Relevant category
Electromagnets
| Product name | Electromagnets - Round, Horizontal Cord |
|---|---|
| Part number | MGE30 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Available sizes
Select the electromagnet to secure fixtures after setup
Available sizes
■Electromagnets - Round, Horizontal Cord
| Material | Surface Treatment | |
|---|---|---|
| Main Body | 1018 Carbon Steel | Electroless Nickel Plating |
| Resin Part | Epoxy Resin | - |
■Sizes and Dimensions
| O.D. | Thickness | Mounting Thread x Pitch |
|---|---|---|
| 20 | 28 | 4×0.7 |
| 30 | 40 | 6×1.0 |
| 40 | 40 | |
| 50 | 50 | 8×1.25 |
| 60 | 60 | 10×1.5 |
Performance info.
■Speeds / Loads (load info.) of the Electromagnet
| O.D. | Max. Attraction Force N(kgf) |
|---|---|
| 20 | 28(2.8) |
| 30 | 180(18) |
| 40 | 300(30) |
| 50 | 600(60) |
| 60 | 1200(120) |
Cam Follower
| Product name | Cam Followers - Crown Type, No Seal |
|---|---|
| Part number | CFUR6-16 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Mount it to the area only where the load applies in order to support external force to the unit. Compatible with rotary motions as well
Available sizes
■Cam Followers - Crown Type, No Seal
| Usage | Main Body | Nut | |||
|---|---|---|---|---|---|
| Material | Seal | Material | Surface Treatment | ||
| Not Provided | Provided | ||||
| General | 52100 Bearing Steel | ○ | ○ | 1045 Carbon Steel | Black Oxide |
| 440C Stainless Steel | ○ | ○ | 304 Stainless Steel | - | |
| Low Dust Generation | - | ○ | |||
■Sizes and Dimensions
| Stud Dia. | Thread Dia. x Pitch | Outer Ring Dia. | Outer Ring Width | Overall Length |
|---|---|---|---|---|
| φ5 | M5×0.8 | φ13 | 9 | 23 |
| φ6 | M6×1.0 | φ16 | 11 | 28 |
| φ8 | M8x1.25 | φ19 | 11 | 32 |
| φ10 | M10x1.25 | φ22 | 12 | 36 |
| φ26 |
Accuracy Info
■Accuracy of Cam Followers
| Stud Dia. | Stud dia. Tolerance (h7) | Outer Ring Width Tolerance |
|---|---|---|
| φ5 | 0 -0.012 | 0 -0.12 |
| φ6 | ||
| φ8 | 0 -0.015 | |
| φ10 | ||
Performance info.
Cam Follower Load Rating and Rotational Speed
| Stud Dia. -Outer Ring Dia. | Basic Dynamic Load Rating C(kN) | Basic Static Load Rating Cor(kN) | Max. Allowable Load (kN) | Track Load Capacity (kN) | Max. Rotational Speed (rpm) | |
|---|---|---|---|---|---|---|
| With Seal | No Seal | |||||
| φ3−φ10 | 1.47 | 1.18 | 0.36 | 1.37 | 32900 | 47000 |
| φ4−φ12 | 2.06 | 2.05 | 0.78 | 1.76 | 25900 | 37000 |
| φ5−φ13 | 3.14 | 2.77 | 1.42 | 2.25 | 20300 | 29000 |
| φ6−φ16 | 3.59 | 3.58 | 2.11 | 3.43 | 17500 | 25000 |
| φ8−φ19 | 4.17 | 4.65 | 4.73 | 4.02 | 14000 | 20000 |
| φ10−φ22 | 5.33 | 6.78 | 5.81 | 4.7 | 11900 | 17000 |
| φ10−φ26 | 5.49 | |||||
| φ12−φ30 | 7.87 | 9.79 | 9.37 | 7.06 | 9800 | 14000 |
| φ12−φ32 | 7.45 | |||||
| φ16−φ35 | 12 | 18.3 | 17.3 | 11.2 | 7000 | 10000 |
| φ18−φ40 | 14.7 | 25.2 | 26.1 | 14.4 | 5950 | 8500 |
| φ20−φ52 | 20.7 | 34.8 | 32.1 | 23.2 | 4900 | 7000 |
IDEA NOTE Using electromagnet to secure position of the fixture
Setup changing is easy to conduct because no bolt tightening is needed.
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Application Overview
Purpose
- Without changing the whole fixture setup attached to rotating actuator only part of fixture holding workpieces are changed. Changing parts of fixture are held in place using electromagnets.
Points for use
- Toolless set up design.
Target workpiece
- Plastic parts
- Dimensions: W70mm x D25mm x H15mm
- Weight: About 25g
Design Specifications
Operating Conditions or Design Requirements
- Dimensions
- W450mm x D329mm x H210mm
Required Performance
- Fixture retention force
- Retention force should be equal or greater than the fixture weight (640g) and it should keep fixture in the same horizontal plane during rotation (equal or greater than centrifugal force).
Selection Criteria for Main Components
- Pull force of electromagnet.
Design Evaluation
Verification of main components
- Verify the electromagnet pull force is large that fixture weight and centrifugal force.
- Conditional values: Fixture weight m: 0.64kg, radius of rotation (with the center at the fixture) r: 0.175m, rotation time t: 1s, rotation angle θ: 180° = 3.14rad, g = 9.8m/s²
- ω = θ/ｔ = 3.14/1 = 3.14 rad/s
- Centrifugal force: F＝ m × r × ω² = 0.64 x 0.175 x (3.14)² = 1.1N
Electromagnetic holder attachment force: about 100N, from catalogue graph value
⇒F = 1.1 < 100N…Safety factor 90, m × g = 0.64 × 9.8 = 6.27N < 100N…Safety factor 15.9
* The electromagnet pull force is largely influenced by surface accuracies of attracted object and gap between magnet and object surface. Therefore, the safety factor is set to a higher value.
Other Design Consideration
- Make sure that wiring of electromagnets are not tangled with rotary actuator.
- The fixture is made out of aluminum and resin for weight reduction. Metal plates are added to the fixture and position over electromagnets. Surface of metal plates should be machined to improve surface roughness and minimize gaps between plate and magnet.
- Metal plate position should be placed as close as possible under center of the gravity of fixture.
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