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No.000261 Workpiece clamp mechanism
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A workpiece clamping and unclamping mechanism.
Related Category
Hinge Bases
| Product name | Hinge Bases/U-Shaped |
|---|---|
| Part number | HKPB6-H25 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select a standard product that is easy to obtain as a fulcrum for the clevis cylinder.
Available sizes
■Hinge Bases - U-Shaped
| Type | Material | Surface Treatment |
|---|---|---|
| U-Shaped | EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating | ||
| EN 1.4301 Equiv. | - |
■Sizes and Dimensions
| Pin Dia. | Pin hole height in 1mm increments | U-shape dimensions |
|---|---|---|
| 2 | 15 ~ 20 | 4 |
| 3 | 20 ~ 25 | 6 |
| 4 | 8 | |
| 5 | 25 ~ 30 | |
| 6 | 10 | |
| 8 | 30 ~ 40 | |
| 10 | ||
| 12 | 12 | |
| 13 | ||
| 14 | 35 ~ 45 | |
| 15 | 16 | |
| 16 | ||
| 20 | 40 ~ 50 | 20 |
| 25 | 30 |
Precision Pivot Pins
| Product name | Precision Pivot Pins/Flanged/Hex Socket Head/Threaded with Lock Nut |
|---|---|
| Part number | CLBRU6-32 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select a lock nut type, which can be firmly mounted as a clevis pin.
Available sizes
■Precision Pivot Pins - Flanged, Hex Socket Head, Threaded with Lock Nut
| Material | Hardness | Surface Treatment | Included Nut Material | |
|---|---|---|---|---|
| Standard Nut | U Nut | |||
| EN 1.1191 Equiv. | - | Black Oxide | JIS-SWRCH | EN 1.0038 Equiv. |
| 40 ~ 45HRC | ||||
| - | Electroless Nickel Plating | EN 1.4301 Equiv. | EN 1.4301 Equiv. | |
| 40 ~ 45HRC | ||||
| Plating Hardness 750HV - | Hard Chrome Plating | JIS-SWRM | EN 1.0038 Equiv. | |
| Plating Thickness 3μm or more | ||||
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | EN 1.4301 Equiv. |
| EN 1.4125 Equiv. | 45 ~ 50HRC | |||
| 45 ~ 50HRC Plating Hardness 750HV - | Hard Chrome Plating Plating Thickness 3μm or more | |||
■Sizes and Dimensions
| Pin Dia. | Pin Section Length (Configurable in 0.1mm Increments) | Head O.D. | Head Height | Thread Length | Thread Dia. X Pitch |
|---|---|---|---|---|---|
| Ø4 | 10.0-50.0 | Ø7 | 5 | 6 | M3 x 0.5 |
| Ø5 | 10.0-60.0 | Ø9 | M4 x 0.7 | ||
| Ø6 | 10.0-100.0 | Ø10 | 9 | M5 x 0.8 | |
| Ø8 | 10.0-100.0 | Ø13 | M6 x 1.0 | ||
| Ø10 | Ø16 | 12 | M8 x 1.25 | ||
| Ø12 | 10.0-200.0 | Ø18 | 16 | M10 x 1.5 | |
| Ø13 | 20.0-200.0 | Ø24 | 18 | M12 x 1.75 | |
| Ø14 | |||||
| Ø15 | |||||
| Ø16 | 20.0-200.0 | ||||
| Ø17 | |||||
| Ø18 | 24 | ||||
| Ø20 | Ø27 | M16 x 2.0 | |||
| Ø22 | 20.0-200.0 | ||||
| Ø25 | Ø30 |
Accuracy Info
■Precision Pivot Pins
| Pin Dia. | Tolerance |
|---|---|
| Ø4-Ø6 | -0.004 -0.012 |
| Ø8 ･ Ø10 | -0.005 -0.014 |
| Ø12-Ø18 | -0.006 -0.017 |
| Ø20 ･ Ø22 ･ Ø25 | -0.007 -0.020 |
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Each sub-assembly unit can be used as it is or can be edited.
Application Overview
Purpose
- Clamps workpieces using a flat spring.
- The workpiece is held on the turntable using a linking mechanism, and unclamped through the use of a cam follower mounted on the table.
Points for use
- Rotates the turn table using separate units and stops in the unclamping position. The work piece can then be removed, and operated for the next clamping and rotation.
Target workpiece
- Material: ABS disc
- External dimensions: Ø16 x 6mm
- Workpiece mass: 2g
Design Specifications
Operating Conditions or Design Requirements
- Cylinder stroke: 30mm
- Deflection of the flat spring at clamp 1.5mm
- Deflection of the flat spring at unclamp 3mm.
- External dimensions: W296 x D244 x H237mm
Required Performance
- Spring load: 1N (with the workpiece clamped)
- Flat spring material: EN 1.4301 Equiv.
Selection Criteria for Main Components
- Flat spring
- Can utilize the available space and meets the clamping load needs.
Design Evaluation
Verification of main components
- Flat spring
- Required plate thickness: t
Plate width: b = 7mm
Clamp force: P = 1N
Young's modulus: E = 199GPa
Load position: l = 37mm
Deflection at clamp: δ = 1.5mm
Number of flat springs used: n = 2pieces
t = ((12 x P/n x l³)/(3 x δ x E x b))⅓
= ((12 x 1/2 x 37³)/(3 x 1.5 x 199 x 10³ x 7))⅓
= 0.36
From t > 0.36mm, t is set to be t = 0.4mm.
- Required plate thickness: t
Other Design Consideration
- A mechanism that clamps and unclamps a workpiece from the side. A cam follower is used for the unclamping unclamp process to achieve a floating condition.
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