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No.000016 Continuity inspection fixture
12
12
Spring held surface inspection fixture
Related Category
T Shaped Handle
| Product name | T-Shaped Handles |
|---|---|
| Part number | TSPF50-3 |
| Features | T-shaped resin handle |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable for work operations.
Available sizes
■T-Shaped Handles
| Material / Surface treatment | |
|---|---|
| Handle | Threads |
| Glass fiber reinforced nylon | EN 1.0038 Equiv. (Inserts) / Trivalent chromate |
| (Matte black) | |
■Sizes and Dimensions
| Thread type | Overall width | Mounting thread DIA. (Coarse) | Thread length | Mounting height | |||
|---|---|---|---|---|---|---|---|
| 10 | 15 | 20 | 25 | ||||
| Male threads | 50 | M4 | ○ | ○ | ○ | - | 43 |
| M5 | ○ | ○ | ○ | - | |||
| M6 | ○ | ○ | ○ | - | |||
| 80 | M6 | - | ○ | ○ | ○ | ||
| M8 | - | ○ | ○ | ○ | |||
| M10 | - | ○ | ○ | ○ | |||
| Female threads | 50 | M3 ･ M4 ･ M5 | 20 | ||||
| 80 | M5 ･ M6 ･ M8 | 25 | |||||
Extension Spring
| Product name | Extra Light Load/Light Load/Light to Medium Load/Medium Load |
|---|---|
| Part number | AUY8-50 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Simplest means of position return function.
Available sizes
■Extension Springs - Standard Lengths
| Load type | Material | O.D. range | Free length range | Hook on both ends | ||
|---|---|---|---|---|---|---|
| Spring Steel (ASTM A228) | EN 1.4301 Equiv. | S shaped | 90 deg. S shaped | |||
| 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. of extension spring
| Load type | Reference 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 calculations of extension spring
P = Pi + (k x F)
- P: Load (N)
- Pi: Initial tension (N)
- k: Spring constant (N/mm)
- F: Deflection (mm)
Contact Probe
| Product name | Contact Probes/NP90SF/NP90 Series |
|---|---|
| Part number | NP90HD-C |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Essential for fixture function
Available sizes
■Contact Probes - NP90SF, NP90 Series
| Part name | Material | Surface treatment |
|---|---|---|
| Plunger | EN CW101C Equiv. | Nickel base rhodium plated |
| Barrel | Brass | Nickel base gold plated |
| Spring | Carbon Steel | Gold plated |
| Ball | JIS-SUJ (Bearing Steel) | Gold plated |
■Tip shape
| Tip shape | Min. mounting pitch | Full stroke | Initial spring pressure | |
|---|---|---|---|---|
| A | 4.5 | 6.4 | 10gf, 40ｇｆ, 146gf | |
| B | 3.5 | |||
| C | ||||
| D | 4.5 | |||
| E | 3.5 | |||
| G | ||||
| AS | ||||
Performance info.
■Contact probe (Min. mounting pitch 3.5mm) load info.
| Spring pressure | Allowable current | Resistance | Replacement frequency guideline | |
|---|---|---|---|---|
| Initial | 2/3 stroke | |||
| 10gf | 50gf | 1.5A | 80mΩ | 300,000 cycles |
| 40gf | 150gf | |||
| 146gf | 250gf | |||
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Application Overview
Purpose
- A device used to inspect surface continuity using a contact probe.
Points for use
- Manually held by toggle clamp operations.
- Contact probe is lowered manually.
Target workpiece
- Molded plastic products
Dims.: W122 x D60 x H20
Design Specifications
Operating Conditions or Design Requirements
- The toggle clamp operation angle is 90°.
- External dims.: W230 x D100 x H219
Selection Criteria for Main Components
- Toggle clamp
- Maintained type with a horizontal handle is mounted on a 90° incline to save space.
- Extension spring
- Spring with a low constant force is selected to ease the operation effort.
- Linear guide
- Since the moment load is small, select a guide comparable to the fixture size.
Design Evaluation
Verification of main components
- Spring constant extension force is low to make operation easier.
- Extension spring load
- Formula: Reaction force kx + Initial tension
- Assumed operation load: F = 10.335N
- Initial tension: 2.35N
- Assumed deflection during operation: x = 39.5mm (When set 0mm, when stroked 39.5mm)
- Moving part weight: 1.1N
- k = (F - Initial tension + moving part weight) / x = (10.335 - 2.35 + 1.1) / 39.5 = 0.23
- Spring constant: k = 0.23N/mm is selected.
Other Design Consideration
- Linear guide stabilizes linear motion.
- Select an extension spring with a constant large enough that the probe does not fall down by its own weight.
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