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No.000220 Workpiece Positioning Mechanism
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Positioning in X and Y directions with a single cylinder.
Relevant category
Resin Rollers
| Product name | Rollers - Plastic, Milled Type / Press-fit Type |
|---|---|
| Part number | RORMCS20-L20 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
For positioning without damaging the workpiece
Available sizes
■Rollers - Plastic, Milled Type / Press-fit Type
| Material | |
|---|---|
| Main Body | Bearing |
| Polyacetal | Steel |
| Stainless | |
| Ultra High-molecular-weight Polyethylene | Steel |
| Stainless | |
| Chrome Plating | Steel |
| Stainless | |
| MC Nylon | Steel |
■Sizes and Dimensions
| O.D.(mm) | Shaft Bore Dia. | Length (1 mm increments) | Bearing |
|---|---|---|---|
| 20 | 6 | 15-100 | 696ZZ×2 |
| 30 | 8 | 20-100 | 698ZZ×2 |
| 10 | 6900ZZ×2 | ||
| 12 | 6901ZZ×2 | ||
| 40 | 10 | 6900ZZ×2 | |
| 12 | 6901ZZ×2 | ||
| 15 | 6902ZZ×2 | ||
| 20 | 6804ZZ×2 | ||
| 50 | 12 | 30-100 | 6001ZZ×2 |
| 60 | 15 | 6002ZZ×2 | |
| 80 | 15 | 6002ZZ×2 |
Resin Washer
| Product name | Resin Washers - Flanged / Flanged Solid |
|---|---|
| Part number | FWHJM-D10-H12-V8-T1-L3 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Resin Washer
Suitable for serving as a washer while receiving spring force
Available sizes
■Resin Washers - Flanged / Flanged Solid
| Material | Color | |
|---|---|---|
| Polyacetal | White | |
| Black | ||
| MC nylon Standard grade | Blue | |
| Ivory | ||
| MC nylon Conductive grade | CDR2 | Black |
| CDR6 | ||
| Bakelite | Paper Type | Brown |
| Cloth Type | Light Brown | |
| Fluororesin | White | |
| PEEK | Gray | |
| Epoxy Glass | Green | |
■Sizes and Dimensions
| Flange Section O.D. | O.D. | I.D. (0.5mm increments) | Washer Section Thickness (0.5mm increments) | Overall Length (0.5mm increments) |
|---|---|---|---|---|
| 4.0-10 (0.5mm increments) | 6.0-20 (0.5mm increments) | 0 2.0 2.6 3.0-55.0 | 1.0-8.0 | 2.0-5.5 |
| 6.0-10.0 | ||||
| 10.5-20 (0.5mm increments) | 12.5-30 (0.5mm increments) | 2.0-5.5 | ||
| 6.0-10.0 | ||||
| 21-30 (1mm increments) | 23-40 (1mm increments) | 2.0-5.5 | ||
| 6.0-10.0 | ||||
| 31-40 (1mm increments) | 33-50 (1mm increments) | 2.0-5.5 | ||
| 6.0-10.0 | ||||
| 41-50 (1mm increments) | 43-60 (1mm increments) | 2.0-5.5 | ||
| 6.0-10.0 | ||||
| 51-60 (1mm increments) | 53-70 (1mm increments) | 2.0-5.5 | ||
| 6.0-10.0 |
Accuracy Info
■Accuracy of the Resin Washers (Flanged)
| Flange Section O.D. Tolerance | 0 -0.2 |
|---|---|
| O.D. Tolerance | 0 -0.2 |
| I.D. Tolerance | +0.3 +0.1 |
| Washer Section Thickness Tolerance | ±0.1 |
| Overall Length Tolerance | 0 -0.3 |
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Application Overview
Purpose
- Purpose
- Accurately position a workpiece in the X and Y directions.
- Operation
- A workpiece is loaded inside the three positioning rollers. Positioning rollers connected on a cylinder rod presses the corner of workpiece and position workpiece in X and Y direction.
Target workpiece
- Shape: pallet
- Size: W300 x D200 x H30mm
- Weight: 1.1kg
Design Specifications
Operating Conditions or Design Requirements
- Specifications
- Positioning capability that withstands a machining load of 50N.
- Outer dimensions: W259 x D200 x H80mm
Selection Criteria for Main Components
- Cylinder is selected based of the cylinder thrust force.
Design Evaluation
Verification of main components
- The cylinder thrust is verified based on the workpiece positioning load.
- (confirmation of positioning cylinder thrust)
- Conditional value: operating air pressure 0.5MPa, efficiency: 0.8
- Cylinder theoretical thrust: 245N
As a workpiece is pressed diagonally in this application example,
X direction: from cylinder thrust x efficiency x cos(angle of cylinder thrust),
245 x 0.8 x cos 33.7° = 163.06N
Y direction: from cylinder thrust x efficiency x sin(angle of cylinder thrust),
245 x 0.8 x sin 33.7° = 108.7N - (Confirmation of positioning capability)
- Conditional value: pallet weight: 1.1kg, friction coefficient: μ = 0.02 (on ball rollers), machining load 50N
- The cylinder thrust required for positioning is
1.1 x 9.8 x 0.02 + 50 = 50.2156N < 108.7N
-> The condition is met.
Other Design Consideration
- Workpiece positioning rollers are installed at three positions.
- The actuator positioning rollers should be arranged so as to press the workpiece diagonally.
- Two actuator positioning rollers should be able to swing so rollers can evenly contact the workpiece.
To stabilize the position of the workpiece, springs could be used. - To tolerate shaft displacement due to positioning, resin washer with large inner diameter are used on the pusher base cylinder.
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