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No.000014 Surface locating mechanism using two flat plates
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High accuracy surface locating mechanism using two plates for reference
Related Category
Aluminum Extrusions
| Product name | 5 Series/slot width 6/20x20mm, Parallel Surfacing |
|---|---|
| Part number | HFSP5-2020-300 |
| Features | HFS5 Series extrusions with milled top/bottom surfaces. Can be used for Linear Guide mounting. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Top / bottom surface parallelism needs 0.1 tolerance.
Available sizes
■Aluminum Extrusions with Milled Surfaces
| Ext.size Width x Height | Extrusion slots Applicable screw DIA. | Length configure in 0.5mm increments | Width | Height after milling |
|---|---|---|---|---|
| 20 x 20 | M5 | 100 - 3000 | 20 | 19.2 |
| 40 x 20 | 40 | 19.2 | ||
| 20 x 40 | 20 | 39.2 | ||
| 25 x 25 | M8 | 25 | 24.2 | |
| 50 x 25 | 50 | 24.2 | ||
| 25 x 50 | 25 | 49.2 | ||
| 60 x 20 | M5 | 60 | 19.2 | |
| 20 x 60 | 20 | 59.2 | ||
| 80 x 20 | 80 | 19.2 | ||
| 20 x 80 | 20 | 79.2 | ||
| 40 x 40 | 40 | 39.2 | ||
| 60 x 40 | 60 | 39.2 | ||
| 40 x 60 | 40 | 59.2 | ||
| 80 x 40 | 80 | 39.2 | ||
| 40 x 80 | 40 | 79.2 |
Accuracy Info
■Accuracy of Milled surface aluminum extrusions
- Milled surface external tolerance (Square, Horizontal rectangle): ±0.05
- Milled surface external tolerance (Square, Vertical rectangle): ±0.1
- Parallelism of milled surface: 0.01 / 100 or better
Locating Pins,Resin,Large Head Type
| Product name | Resin/Large Head/Sphere/P Configurable/Standard |
|---|---|
| Part number | JPZQ6-10 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Protect the workpiece with rounded tip.
Available sizes
■Resin Locating Pins- Large Head, Sphere, P Configurable, Standard
| Material | Operating Ambient Temperature |
|---|---|
| Polyacetal (Black) | -45 ~ 95°C |
| MC Nylon (Blue) | -40 ~ 120°C |
| Conductive MC Nylon CDR2 (Black) | -40 ~ 120°C |
| PEEK (Ivory) | -50 ~ 250°C |
■Sizes and Dimensions
| Shank DIA. | Pin head DIA. | Shank pilot DIA. | Pin Length |
|---|---|---|---|
| Configure in 0.01mm increments | |||
| Ø1 | Ø1.50 - Ø2.50 | 3 | 3 |
| Ø2 | Ø2.50 - Ø4.00 | 4 | |
| Ø3 | Ø3.50 - Ø6.00 | 5 | 5 |
| Ø4 | Ø4.50 - Ø7.00 | 6 | |
| Ø5 | Ø5.50 - Ø8.00 | 10 | |
| Ø6 | Ø6.50 - Ø10.00 | 8 | |
| Ø8 | Ø9.00 - Ø13.00 | 15 | |
| Ø10 | Ø11.00 - Ø15.00 | 10 |
Accuracy Info
■Accuracy of Locating pin, Resin large head type
- Shank DIA. tolerance: m6
- Pin head DIA. tolerance: 0 / -0.05
- Concentricity of shank pilot and pin head: Ø0.05
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Application Overview
Purpose
- A simplified surface plate for objects with protrusions on the bottom that cannot be placed on coplanar surface plates.
Target workpiece
- Molded plastic product
Dims.: W280 x D40 x H25
Weight: 0.18kg
Design Specifications
Operating Conditions or Design Requirements
- External dims.: W300 x D100 x H52.2
Selection Criteria for Main Components
- Aluminum extrusion frame
- Two surface machined product selected for high accuracy.
Design Evaluation
Other Design Consideration
- Workpiece dimensions of W280 x D40 with protrusions on the bottom prevent the use of a conventional surface plate.
- Separate pieces are machined together to obtain the needed accuracy. This saves costs as well as overall weight.
- While the surfaces need to be stainless, the supporting structure can be made of light weight aluminum.
- To avoid applying loads on the screws during simultaneous machining, the stainless steel plates and aluminum plates are pinned and screwed together.
- Accurate flatness is obtained by setting up and machining the two plates in one center.
- The caps must be machined to not protrude from the extrusion cross section.
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