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No.000018 Test fixture for product aging
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Mechanism which converts rotary motion into reciprocating motion
Related Category
Pivot Pin
| Product name | Precision Pivot Pins/Flanged/Hex Socket Head/Threaded with Lock Nut |
|---|---|
| Part number | SCLBR8-17-FC4-MC4 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
To support motor arm rotation.
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 | SWRCH Carbon Steel | 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 | SWRM Low Carbon Steel | 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 | Hard chrome plating | |||
| Plating hardness 750HV ~ | Plating thickness 3µm or more | |||
■Sizes and Dimensions
| Pin DIA. | Pin section length | Head O.D. | Head height | Threaded section length | Screw DIA. x Pitch |
|---|---|---|---|---|---|
| (Configure in 0.1mm increments) | |||||
| 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
Pivot pin, Flanged with Hex socket with a nut: Pin O.D. tolerance (g6)
| Pin diameter | Tolerance |
|---|---|
| Ø4 | -0.004 / -0.012 |
| Ø5 | |
| Ø6 | |
| Ø8 | -0.005 / -0.014 |
| Ø10 | |
| Ø12 | -0.006 / -0.017 |
| Ø13 | |
| Ø14 | |
| Ø15 | |
| Ø16 | |
| Ø17 | |
| Ø18 | |
| Ø20 | -0.007 / -0.020 |
| Ø22 | |
| Ø25 |
Tension Spring
| Product name | Tension Springs/Heavy Load |
|---|---|
| Part number | AWF12-60 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
To support applied load to workpiece.
Available sizes
■Tension Springs -Heavy Load-
| Load class | Material | O.D. | Free length | End hooks | ||
|---|---|---|---|---|---|---|
| Spring Steel (ASTM A228) | EN 1.4301 Equiv. | Range | Range | S hook | 90 deg. S hook | |
| Extra light load | ○ | ○ | Ø2 - 12 | 10 - 100 | ○ | - |
| Light load | ○ | △ | Ø2 - 20 | 10 - 175 | ○ | △ |
| Light-Med. load | ○ | △ | Ø2 - 20 | 10 - 175 | ○ | △ |
| Med. load | ○ | △ | Ø2 - 24 | 10 - 200 | ○ | △ |
| Med.-Heavy load | ○ | - | Ø2 - 12 | 10 - 100 | ○ | - |
| Heavy load | ○ | △ | Ø3 - 24 | 10 - 200 | ○ | △ |
Performance info.
■Load info. on tension springs
| Load class | Ref. Load (N) | |
|---|---|---|
| Min. | Max. | |
| Extra light load | 0.69 | 19.6 |
| Light load | 1.86 | 78.45 |
| Light-Med. load | 2.45 | 98.07 |
| Med. load | 3.53 | 225.55 |
| Med.-Heavy load | 6.47 | 83.36 |
| Heavy load | 8.8 | 430.51 |
Technical calculations
■Load info. on tension springs
P = Pi + (k x F)
- P: Load (N)
- Pi: Initial tension (N)
- k: Spring constant (N/mm)
- F: Deflection (mm)
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Application Overview
Purpose
- Fixture to measure aging variations (dimensional changes over time, and cracking, etc.) by applying repeated loads. (Not to the extent of destruction)
Points for use
- Motor driven oscillating mechanism.
Target workpiece
- Levered lug
External Dims.: W40 x D30 x H3 (excluding the lever)
Workpiece weight: 5g
Design Specifications
Operating Conditions or Design Requirements
- Oscillates in ±45° range.
- External dims.: W516 x D300 x H468
Required Performance
- Tensile load: 60N
Spring constant: 4.13N/mm
Selection Criteria for Main Components
- Motor
- A motor is selected for automated oscillating motion.
- Spring
- Spring selection makes applying arbitrary loadings possible.
Design Evaluation
Verification of main components
- Select an appropriate motor for oscillating motion.
- Motor speed
- Motor RPM (Ns) : 1800rpm
- Reduction ratio (i) : 1 / 50
- Rotation pitch circle diameter (Dp) : 156mm
- Link ratio: Approx. 1 / 3
- Speed (V)
V = Ns x (1 / 60) x i x π x Dp x 1 / 3
= 1800 x (1 / 60) x (1 / 50) x π x 156 x 1 / 3 = 98mm/s
- Torque
- Motor torque Tm = 3.33N･m
- Assumed load: F = 60N
- Link ratio: Approx. 1 / 3
- Fa = F * 1 / 3
- Load torque TL = (Fa x Dp) / (2 x 1000) = 60 x (1 / 3) x 156 / (2 x 1000) = 1.56N･m
Tm > TL, OK.
- Spring load
- Formula: Reaction force F = kx
- Assumed load: F = 60N
- Deflection under tension: x = 14.5mm
- Spring constant: k = 60 / 14.5 = 4.13N/mm selected
Other Design Consideration
- The spring load can be varied by moving the spring post in a slot located on the plate. An adjusting bolt is used for adjustments. The above configuration makes it easy to change the spring (varying the tension)
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