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No.000202 Depth Gauge
Dedicated depth gauge tailored to specific workpiece shapes.
Related Category
Dial Gage Holders
| Product name | Clamp Sleeve for Gauge Device |
|---|---|
| Part number | DGHL1 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Used for mounting dial gauge
Available sizes
■Dial Gage Holders
| Material | Surface Treatment | |
|---|---|---|
| Knob | Collet | |
| JIS-SUP6(Spring Steel) | Chrome Plating | Sandblasted Finish |
■Dimensions of Dial Holder
Hex Socket Screws
| Product name | Hex Socket Screws/Dog Point/Head Cap Screw |
|---|---|
| Part number | CBBG5-12 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Low cost and easily available as screws for upper/lower limit setting
Available sizes
■Hex Socket Screws - Dog Point
| Material | Hardness | Surface Treatment |
|---|---|---|
| EN 1.7220 Equiv. | 45HRC- | Black Oxide |
| 38-43HRC | ||
| EN 1.4301 Equiv. | - | - |
■Sizes and Dimensions
(mm)
| Thread Dia. | Thread Length | Nose Dia. | Nose Length | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 16 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | |||
| 4 | ○ | ○ | ○ | ○ | ○ | 3 | 3 | ||||
| 5 | ○ | ○ | ○ | ○ | ○ | 4 | 4 | ||||
| 6 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ||||
| 8 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | 6 | 5 | ||
| 10 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | 8 | 6 | ||
Accuracy Info
■Hex Socket Screws - Dog Point accuracy
(mm)
| Thread Dia. | Nose Dia. | Nose Dia. Tolerance | Nose Length Tolerance | Thread Length Tolerance |
|---|---|---|---|---|
| 4 | 3 | -0.1 -0.2 | +0.2 0 | -0.3 -0.6 |
| 5 | 4 | |||
| 6 | ||||
| 8 | 6 | -0.1 -0.3 | ||
| 10 | 8 |
IDEA NOTE Dedicated depth gauge tailored according to workpiece shape
The zero point of the gauge is adjusted by using a high-accuracy master having the same shape as the workpiece hole. By using this gauge, the depth of the workpiece hole is measured at a high accuracy.
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Application Overview
Purpose
- Place the gauge in the master and measure the workpiece hole dimensions to adjust the dial and to find the zero point.
- Using a structure that allows stroking up and down from the center value by means of a spring, the upper and lower run-outs of the tolerance are measured.
Points for use
- The workpiece is manually set and removed from the testing hole.
- Because the gauge needs to have a high accuracy the specialized manufacturing is expensive.
Target workpiece
- Workpiece: aluminum die cast housing
- Material：EN AC-46100 Equiv.
- W150mm x D300mm x H70mm
- Mass：5.8kg
Design Specifications
Operating Conditions or Design Requirements
- Pin stroke：4mm
- W40 x D37 x H217mm(when gauge only is used)
- W40 x D41 x H227mm(when master is included)
Required Performance
- Accuracy of zero point adjustment: ±0.01mm or less
- Gauge push force 5N
Selection Criteria for Main Components
- Round coil spring
- A compression spring is selected so that the stroke starts when the gauge makes contact with the bottom surface of the hole.
Design Evaluation
Verification of main components
- A spring suitable for gauge push force is selected.
- Compression spring load
- Calculation formula: reaction force F = kx
- Gauge push load: F = 5N
- Assumed deflection when inserted into workpiece (minimum): x = 10mm
- From k = F/x = 5/10 = 0.5,
spring constant: k = 0.5 N/mm is selected.
Other Design Consideration
- A measurement structure that allows stroking up and down from the center value by means of a spring, the upper and lower run-outs of the tolerance are recorded.
- To remove foreign matter adhered to the bottom surface of the depth gauge, shallow grooves in a cross shape are added on the top face of the master.
- Workability is enhanced by configuring the hole in the upper master in two steps.
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