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No.000218 Fine Adjustment Mechanism Using Flat Springs
16
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Slide Adjustment Utilizing Flat Spring
Related Category
Adjusting Stopper Screws
| Product name | Adjusting Stopper Screws/Hexagon Socket/L Configurable/Fine Thread |
|---|---|
| Part number | ANBS6-20 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Screw with radius at the end is suitable for holding the flat spring.
Available sizes
■Adjusting Stopper Screws - Hex Socket Type
| Adjusting | Material | Hardness | Surface Treatment |
|---|---|---|---|
| Fine Thread | EN 1.1191 Equiv. | 45-50HRC | Electroless Nickel Plating |
| Trivalent Chromate | |||
| EN 1.7220 Equiv. | 50HRC- | ||
| EN 1.4301 Equiv. | - | - | |
| EN 1.4031 Equiv. | 45HRC- | - | |
| Coarse Thread | EN 1.1191 Equiv. | 45-50HRC | Electroless Nickel Plating |
| Trivalent Chromate | |||
| EN 1.7220 Equiv. | 50HRC- | ||
| EN 1.4301 Equiv. | - | - | |
| EN 1.4031 Equiv. | 45HRC- | - |
■Sizes and Dimensions
| Screw Shaft Dia. (mm) | Thread Length | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 60 | 70 | 80 | 90 | 100 | 120 | |
| 3 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - | - |
| 4 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 5 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 6 | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 8 | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 10 | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - |
| 12 | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - |
| 16 | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
| 20 | - | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
Strut Clamp, Unequal Dia., Parallel Holes, Pitch Selectable
| Product name | Parallel Configuration/Different Diameter/Selectable Pitch |
|---|---|
| Part number | KKQT20-15-40 |
| Features | For parallel shaft configuration. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective for connecting two parallel shafts.
Available sizes
■Strut Clamp (Unequal Dia., Parallel Holes, Pitch Selectable)
| Material | Surface Treatment | Accessory |
|---|---|---|
| EN 1.0038 Equiv. | Black Oxide | Hex Socket Head Cap Screw |
■Sizes and Dimensions
| Large Hole Dia. | Small Hole Dia. | Hole Pitch | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 20 | 25 | 30 | 40 | 50 | 75 | 100 | 150 | ||
| 10 | 8 | ○ | ○ | ○ | - | - | - | - | - | - |
| 12 | 10 | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 15 | ○ | ○ | ○ | ○ | - | - | - | - | - | |
| 20 | 15 | - | ○ | ○ | ○ | ○ | - | - | - | - |
| 25 | - | - | ○ | ○ | ○ | ○ | - | - | - | |
| 30 | 20 | - | - | - | ○ | ○ | ○ | ○ | - | - |
| 35 | 25 | - | - | - | - | - | ○ | ○ | ○ | ○ |
Accuracy Info
■Accuracy of Strut Clamp
| Large Hole Dia. | Large Hole Dia. Tolerance (H7) | Small Hole Dia. | Small Hole Dia. Tolerance (H7) |
|---|---|---|---|
| 10 | +0.015 0 | 8 | +0.015 0 |
| 12 | +0.018 0 | 10 | |
| 15 | |||
| 20 | +0.021 0 | 15 | +0.018 0 |
| 25 | |||
| 30 | 20 | +0.021 0 | |
| 35 | +0.025 0 | 25 |
Parallelism of Holes: 0.05
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Application Overview
Purpose
- Purpose
- To perform fine adjustment during product inspection without changing overall dimensions and layout of the fixture.
- Operation
- By pressing the flat springs, which are installed at both ends of the slide shaft, from the outside using adjusting bolts, the slide shaft moves. Due to this movement, the optical axis of the inspection camera that is mounted onto strut clamp is adjusted.
After that, lock the position of the slide shaft by applying the adjusting screws to the flat springs from opposite direction.
- By pressing the flat springs, which are installed at both ends of the slide shaft, from the outside using adjusting bolts, the slide shaft moves. Due to this movement, the optical axis of the inspection camera that is mounted onto strut clamp is adjusted.
Target workpiece
- Shape: mounted circuit board
- Size: W80 x D80 x H12mm
- Weight: 40g
Design Specifications
Operating Conditions or Design Requirements
- Maximum fine adjustment amount: 1.6mm
- Outer dimensions: W100 x D242 x H53mm
Selection Criteria for Main Components
- Select adjustment screws that can be used when the flat spring deflection is 1.6mm.
Design Evaluation
Verification of main components
- Verify that length of the adjusting bolts are sufficient to support all camera positions.
- Selection of stopper bolts
- Conditional value: arc length of flat spring (EN 1.4301 Equiv.) L1 = 49.5mm, spring deflection limit σ = 275N/mm², Young's modulus of flat spring E = 186000N/mm², thickness of flat spring H = 1.0mm, arc length from flat spring fixing side to adjusting screw L2 = 24.75mm, length from flat spring to plate for adjusting screw L3 = 11.1mm, overall length of adjusting screw L4 = 30mm, height of nut supplied with adjusting screw L5 = 4mm
- If we assume that the arc-shaped flat spring is a straight line, the deflection σ2 when it is handled as a spring with one end fixed,
σ2 = σ x L2² x (3 x L1/L2 - 1)/(3 x E x H) = 275 x 24.75² x (3 x 49.5/24.75 - 1)/(3 x 186000 x 1.0) = 1.51mm
⇒The length of adjusting screw that can perform adjustment even when the flat spring deflects for 1.51mm is
range satisfying 1.51 + L3 < L4 - L5
1.51 + 11.1 < 30 - 5.4
⇒30mm, hence, selected adjusting stopper screw is acceptable for this application.
Other Design Consideration
- When a flat spring is being adjusted using an adjusting screw on one end, the adjusting screw on the other end should not be in contact with the flat spring.
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