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No.000186 Inspection Probe Adjustment Mechanism
25
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Adjustment mechanism by using the right-handed screw and left-handed screw
Relevant category
Contact Probes
| Product name | Contact Probes - NP88, NP88HD Series |
|---|---|
| Part number | NP88-B |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Based on workpiece and testing requirements.
Available sizes
■Contact Probes (Minimum Mounting Pitch: 1.5 mm)
| Part Name | Material | Surface Treatment |
|---|---|---|
| Plunger | W1-9 Tool Steel | Rhodium Plating on Nickel Undercoat |
| Barrel | Brass | Gold Plating on Nickel Undercoat |
| Spring | SWP | Gold plated |
| Ball | 52100 Bearing Steel | Gold Plating |
■Tip Shape
| Tip Shape | Min. Mounting Pitch | Full Stroke | Initial Spring Pressure | |
|---|---|---|---|---|
| A | 1.5 | 2.5 | 10gf、30ｇf | |
| B | ||||
| C | ||||
| D | ||||
| E | ||||
| G | ||||
| H | ||||
| J | ||||
| N | ||||
Performance Info.
■Load Info of the Contact Probes (Minimum Mounting Pitch: 1.5 mm)
| Spring Pressure | Allowable Current | Resistance | Replacement Cycle (Reference) | |
|---|---|---|---|---|
| Initial | 2/3 Stroke | |||
| 10gf | 50gf | 1.3A | 80mΩ | 250,000 times |
| 30gf | 100gf | |||
Scale Plates
| Product name | Scale Plates |
|---|---|
| Part number | MEPCSH-LC90-HC |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Allow user to read adjustment value.
Available sizes
■Scale Plates (Horizontal, 304 Stainless Steel)
| Width | Scale Type | Material | Plate Thickness | Length |
|---|---|---|---|---|
| 8 | Zero at Left | 304 Stainless Steel | 0.5 | 100・200 |
| Zero at Right | 100・200 | |||
| Center Divided | 300 | |||
| 12 | Zero at Left | 100・200 | ||
| Zero at Right | 100・200 | |||
| Center Divided | 300 |
* Adhesive tapes are not provided.
Use the O3.4 x 2 screw mounting holes (5 mm from the both ends)
Thick Knurled Knobs
| Product name | Knurled Knobs - Thick, L Dimension Standard |
|---|---|
| Part number | NKBA3-6-8 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Used as manual locking pin.
Available sizes
■Thick Knurled Knobs, Stepped and Threaded, L Fixed
| Material | Surface Treatment |
|---|---|
| 1212 Carbon Steel | Buff Polished + Chrome Plating |
| 303 Stainless Steel | Brushed Finish |
| 1212 Carbon Steel | Black Oxide |
■Sizes and Dimensions
| Thread | Knob | Stepped Shaft Part | Mounting Height | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DIA. (Coarse) | Length | O.D. | Thickness | Diameter | Length | |||||||
| 6 | 10 | 16 | 20 | 25 | 30 | 40 | ||||||
| M3 | ○ | ○ | φ12 | 5 | φ6 | 5 | 10 | |||||
| 6 | 11 | |||||||||||
| 8 | 13 | |||||||||||
| 12 | 17 | |||||||||||
| M4 | ○ | ○ | ○ | φ16 | 7 | φ8 | 6 | 13 | ||||
| 9 | 15 | |||||||||||
| 11 | 17 | |||||||||||
| 17 | 23 | |||||||||||
| M5 | ○ | ○ | ○ | φ20 | 8 | φ10 | 7.5 | 15.5 | ||||
| 10 | 17.5 | |||||||||||
| 12 | 19.5 | |||||||||||
| 26 | 33.5 | |||||||||||
| M6 | ○ | ○ | ○ | ○ | ○ | φ24 | 10 | φ12 | 10 | 20 | ||
| 13 | 23 | |||||||||||
| 15 | 25 | |||||||||||
| 25 | 35 | |||||||||||
| M8 | ○ | ○ | ○ | ○ | φ30 | 12 | φ16 | 12 | 24 | |||
| 15 | 27 | |||||||||||
| 30 | 42 | |||||||||||
| M10 | ○ | ○ | ○ | ○ | φ36 | 16 | φ20 | 15 | 31 | |||
| 20 | 35 | |||||||||||
| 40 | 55 | |||||||||||
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It is configured so that each sub-assembly unit can be used as it is or edited.
Application Overview
Purpose
- Purpose
- Test unit that can handle various size workpieces by adjusting the position of inspection probes.
- Operation
- Changes the distance between probes (probe mounting brackets) by operating right/left hand lead screws. Depending on which direction the lead screw knob is turned, the probe mounting brackets are closing in or moving out from each other.
Points for use
- Capable to adjust the probe distance from 2 mm to 22 mm.
Target workpiece
- Shape: Circuit board
- Size: W 240 x D 140 mm
Design Specifications
Operating Conditions or Design Requirements
- External dimensions: W 100 x D 180 x H 74 mm
- Probe adjustment distance: 2 mm - 22 mm
Required Performance
- Accuracy: ± 0.1 mm
- Probe stroke: 2.5 mm
- Probe load: 50 gf (2/3 stroke)
Selection Criteria for Main Components
- Linear guide
- Select a linear guides that can handle the load at the probe contact (initial selection is size 10)
- Compression spring
- To remove any backlash when positioning inspection pins and during testing.
Design Evaluation
Verification of main components
- Select motor based on load moment.
- Motor selection
- Conditional values:
- Motor shaft allowable moment of inertia: 1.25 × 10⁻⁵ kg･m² (catalogue value)
- Reduction ratio: 12.5
- Load total moment of inertia: 5.8 × 10⁻⁵ kg･m²
1.25 x 10⁻⁵ x 12.5 > 5.8 x 10⁻⁴ Thus, no problem. - t = 1.0 s, N =120 rpm (reduction ratio: 12.5), and J = 5.8 kg・cm²
Load torque T=J x N/9.55 x 10-4 x t , T= 7.3×10-3 - Allowable torque: 0.98 N・m
7.3×10⁻³ ＜ 0.98
⇒Thus, meeting the condition.
Other Design Consideration
- Reducing operation force by adopting a fine screw thread.
- Adopting a scale with 0 at the center to read the distance value.
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