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- inCAD Library Home
- > No.000016 Continuity Inspection Fixture
No.000016 Continuity Inspection Fixture
51
51
Spring held surface inspection fixture
Relevant 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 | 1018 Carbon Steel(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 | Extension Springs - Standard Lengths? |
|---|---|
| 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) | 304 Stainless Steel | S shaped | 90 deg. S shaped | |||
| Extra light load | ○ | ○ | φ2 - 12 | 10 - 100 | ○ | - |
| Light load | ○ | △ | φ2 - 20 | 10 - 175 | ○ | △ |
| Light Med. load | ○ | △ | φ2 - 20 | 10 - 175 | ○ | △ |
| Med. load | ○ | △ | φ2 - 24 | 10 - 200 | ○ | △ |
| Med.Heavy load | ○ | - | φ2 - 12 | 10 - 100 | ○ | - |
| Heavy load | ○ | △ | φ3 - 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 | C1730B | Nickel base rhodium plated |
| Barrel | Brass | Nickel base gold plated |
| Spring | Carbon Steel | Gold plated |
| Ball | 52100 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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Assembly data shows the assembly drawings in the concept design phase. The sole purpose of the data is to explain the structure and functionality of the assembly and is not considered nor to be used as a final design.
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* The part in the frame is a sub-assembly unit.
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- * Unit assembly Data consists of some sub-assemblies.
It is configured so that each sub-assembly unit can be used as it is or edited.
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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