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No.000148 Intermittent Rotation Mechanism
177
177
Cylinder-driven index table
Related Category
Cantilever Shafts
| Product name | Cantilever Shafts/Pilot/Standard/Threaded/w Retaining Ring Groove |
|---|---|
| Part number | FXCA8-8-F7-G5 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective because the stepped pins are available with low price and short lead time
Available sizes
■Cantilever Shafts (Piloted Thread with Retaining Ring Groove)
| Type | Material | Surface Treatment |
|---|---|---|
| Thread Length Fixed Screw Length Selectable | EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating | ||
| EN 1.4301 Equiv. | - | |
| EN 1.7220 Equiv. | Black Oxide |
■Sizes
| Pin Dia. (mm) | (1mm Increments) | M(Coarse) | |||
|---|---|---|---|---|---|
| Y | F | G | N | ||
| 3 | 2 - 30 | 3 - 50 | 3 - 8 | 3 - 6 | M3 |
| 4 | 4 - 8 | M4 | |||
| 5 | 5 - 10 | M5 | |||
| 6 | 2 - 60 | 5 - 100 | 5 - 10 | 6 - 12 | M6 |
| 8 | 8 - 16 | M8 | |||
| 10 | 10 - 20 | M10 | |||
| 12 | 10 - 150 | 5 - 15 | 12 - 24 | M12 | |
| 13 | |||||
| 15 | |||||
| 16 | |||||
| 17 | 5 - 20 | ||||
| 18 | |||||
| 20 | 4 - 75 | 20 - 40 | M20 | ||
| M16 | |||||
| 22 | M20 | ||||
| M16 | |||||
| 25 | M20 | ||||
| M16 | |||||
| 30 | M20 | ||||
| M16 | |||||
Accuracy Info
■Accuracy of Cantilever Shafts
Perpendicularity: 0.02
| Pin Dia. (mm) | Tolerance g6 (mm) |
|---|---|
| 3 | - 0.002 - 0.008 |
| 4 | - 0.004 - 0.012 |
| 5 | |
| 6 | |
| 8 | - 0.005 - 0.014 |
| 10 | |
| 12 | - 0.006 - 0.017 |
| 13 | |
| 15 | |
| 16 | |
| 17 | |
| 18 | |
| 20 | - 0.007 - 0.020 |
| 22 | |
| 25 | |
| 30 |
Extra Thin Resin Washer
| Product name | Extra Thin Resin Washers/Abrasion Resistance/Thickness |
|---|---|
| Part number | SWSPS16-8-1.0 |
| Features | Excellent |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
This is required to prevent poor rotation caused by the load along thrust direction at the ratchet operation time.
Available sizes
■Extra Thin Resin Washer (Abrasion Resistant Type)
Material: Polyslider
■Sizes and Dimensions
| O.D. | Inner Dia. (Selectable) | Thickness | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 8 | 3 | 4 | 5 | - | - | - | - | - | - | - | 0.13 0.25 0.5 1.0 |
| 10 | - | 4 | 5 | 6 | - | - | - | - | - | - | |
| 12 | - | 4 | 5 | 6 | 8 | - | - | - | - | - | |
| 14 | - | - | 5 | 6 | 8 | 10 | - | - | - | - | |
| 15 | - | - | 5 | 6 | 8 | 10 | 12 | - | - | - | |
| 16 | - | - | - | 6 | 8 | 10 | 12 | - | - | - | |
| 20 | - | - | - | 6 | 8 | 10 | 12 | 15 | 16 | - | 0.25 0.5 |
| 25 | - | - | - | 6 | 8 | 10 | 12 | 15 | 16 | 20 | |
Accuracy Info
■Thickness Tolerance of Extra Thin Resin Washer (Abrasion Resistant Type)
| Thickness | 0.13 | 0.25 | 0.5 | 1.0 |
|---|---|---|---|---|
| Tolerance | ±0.013 | ±0.025 | ±0.05 | ±0.1 |
Performance info.
■Characteristic Data of Extra Thin Resin Washer (Abrasion Resistant Type)
| Item | Value |
|---|---|
| Tensile Strength (Mpa) | 98 |
| Elongation (%) | 60 |
| Friction Coefficient (µ) | 0.16 ~ 0.4 |
| Insulation Resistance (kV/mm) | 45 |
Knuckle Joints
| Product name | Knuckle Joints/Tapped/Configurable |
|---|---|
| Part number | FNTB6-1.0-D6-B6-U15 |
| Features | Convex and Concave types |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective as an oscillating part for a cylinder & link mechanism
Available sizes
■Knuckle Joints (Free Type Tapped)
| Convex Shaped | Concave Shaped | Material | Surface Treatment | ||
|---|---|---|---|---|---|
| Standard | Wide Type | Bolt Fixing Type | |||
| ○ | ○ | ○ | ○ | EN 1.1191 Equiv. | Black Oxide |
| ○ | ○ | ○ | Electroless Nickel Plating | ||
| ○ | ○ | ○ | EN 1.4301 Equiv. | - | |
■Sizes and Dimensions
| M-Pitch | Hole Dia. (Selectable) | B 1mm Increment | Overall Length A | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Convex Type | Concave Type | ||||||||||||||||
| Standard | Wide Type | Bolt Fixing Type | |||||||||||||||
| *3 - 0.5 | 3 | 4 | 5 | - | - | - | - | - | - | - | - | - | 3 ~ 10 | 3 ~ 5 | 6 ~ 10 | 6 ~ 10 | L+6 |
| *4 - 0.7 | |||||||||||||||||
| *5 - 0.8 | - | 4 | 5 | 6 | - | - | - | - | - | - | - | - | 4 ~ 12 | 4 ~ 6 | 7 ~ 12 | 7 ~ 12 | |
| *6 - 1.0 | |||||||||||||||||
| 8 - 1.0 | - | - | 5 | 6 | 8 | - | - | - | - | - | - | - | 5 ~ 16 | 5 ~ 8 | 9 ~ 16 | L+8 | |
| *8 - 1.25 | 9 ~ 16 | ||||||||||||||||
| 10 - 1.25 | - | - | - | 6 | 8 | 10 | - | - | - | - | - | - | 6 ~ 20 | 6 ~ 10 | 11 ~ 20 | ||
| *10 - 1.5 | 11 ~ 20 | ||||||||||||||||
| 12 - 1.25 | - | - | - | - | 8 | 10 | 12 | 13 | - | - | - | - | 8 ~ 22 | 8 ~ 11 | 12 ~ 22 | - | L+10 |
| 12 - 1.5 | |||||||||||||||||
| 14 - 1.5 | - | - | - | - | - | 10 | 12 | 13 | 14 | 15 | 16 | - | 10 ~ 25 | 10 ~ 13 | 14 ~ 25 | L+12 | |
| 16 - 1.5 | |||||||||||||||||
| 18 - 1.5 | - | - | - | - | - | - | 12 | 13 | 14 | 15 | 16 | 20 | 12 ~ 28 | 12 ~ 14 | 15 ~ 28 | L+14 | |
| 22 - 1.5 | 12 ~ 32 | 12 ~ 16 | - | L+16 | |||||||||||||
| 26 - 1.5 | 12 ~ 38 | 12 ~ 18 | L+19 | ||||||||||||||
Only those sizes with * marks are available for Bolt Fixing Concave Type.
IDEA NOTE Axis cross-sectional view
The ratchet plate and the positioning plate are fastened with screws.
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Application Overview
Purpose
- Purpose
- To rotate 8-position index table to process workpiece.
- Operation
- Performs angle feed of turn table.
- By retracting the cylinder, removes the indexing finger from the groove of indexing gear.
- As the cylinder is extruded, the ratchet claw is engaged with the ratchet gear, causing the index table to rotate. The tension spring keeps pressing the ratchet claw against the ratchet gear.
- The cylinder inserts the indexing claw in the groove of the indexing gear to perform rotational positioning. Retracts cylinder.
Target workpiece
- Shape: connector
- Size: W50 x D50 x H30mm
- Weight: 0.15kg
Design Specifications
Operating Conditions or Design Requirements
- Movement angle: 45 degrees
- Division by 360/8 degrees
- Cylinder stroke: 100mm
- Stopper stroke: 10mm
- Outer dimensions: Ø600 x H114mm
Selection Criteria for Main Components
- Selected an air cylinder that has the thrust specification required to rotate the index table 45 degrees in 1 second.
Design Evaluation
Verification of main components
- The cylinder thrust is verified to see whether it can withstand the workpiece load.
- Here, calculation for selecting air cylinder thrust is explained.
- Conditional value: angle θ = 45degrees, movement time t = 1sec., link arm length L = 0.125m, moment of inertia applied to air cylinder I = 0.5492kg･m²
- As uniform acceleration motion is assumed as angular velocity here, θ: oscillating angle (rad), 45° = 2π / 8rad
- Angular velocity after t seconds: ω = 2･θ / t = 2 x (2π / 8) / 1 = 1.571rad/sec
- Equation of rotary motion: from I･ω = M and M = F･L, cylinder thrust F = I･ω / L = 0.5492 x 1.571 / 0.125 = 6.9N
- Theoretical thrust of Ø40 air cylinder: 628 (N) when air pressure in use is 0.5MPa
-> As F = 6.9 (N) ≤ 628 (N), this is acceptable.
Other Design Consideration
- The ratchet mechanism shall have a sufficient strength.
The bending stress shall be 29 (N/mm²) or less and the shearing stress shall be 24.7 (N/mm²) or less. - For the strength of the indexing positioning part, the required torque shall be considered.
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