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- > No.000148 Intermittent Rotation Mechanism
No.000148 Intermittent Rotation Mechanism
191
191
Cylinder-driven index table.
Relevant category
Cantilever Shafts
| Product name | Cantilever Shafts - Pilot Type - Standard, Threaded, with 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
Low cost and short lead time
Available sizes
■Cantilever Shafts (Piloted Thread with Retaining Ring Groove)
| Type | Material | Surface Treatment |
|---|---|---|
| Thread Length Fixed Screw Length Selectable | 1045 Carbon Steel | Black Oxide |
| Electroless Nickel Plating | ||
| 304 Stainless Steel | - | |
| 4137 Alloy Steel | Black Oxide |
■Sizes
| Pin Dia. (mm) | (1 mm 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 |
|---|---|
| Part number | SWSPS16-8-1.0 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
To help prevent poor rotation caused by the load along the thrust direction
Available sizes
■Extra Thin Resin Washer
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 - Tapped, Configurable
| Convex Shaped | Concave Shaped | Material | Surface Treatment | ||
|---|---|---|---|---|---|
| Standard | Wide Type | Bolt Fixing Type | |||
| ○ | ○ | ○ | ○ | 1045 Carbon Steel | Black Oxide |
| ○ | ○ | ○ | Electroless Nickel Plating | ||
| ○ | ○ | ○ | 304 Stainless Steel | - | |
■Sizes and Dimensions
| M-Pitch | Hole Dia. (Selectable) | B 1 mm 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 Cross-section view
Ratchet plate and the positioning plate fastened together.
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Application Overview
Purpose
- Purpose
- To rotate workpieces on 8-position index table.
- Operation
- Retracting the (indexing) cylinder, removes the finger from the groove of the indexing gear.
- When the (rotation) cylinder is extended, the claw engages the ratchet gear and the index table rotates. The tension springs keeps the claw pressed against the gear.
- When the (indexing) cylinder is extended, the finger is inserted into the groove to fix the rotational position.
Target workpiece
- Shape: connector
- Size: W50 x D50 x H30 mm
- Weight: 0.15 kg
Design Specifications
Operating Conditions or Design Requirements
- Movement angle: 45degrees
- Cylinder stroke: 100mm
- Stopper stroke: 10mm
- Outer dimensions: φ600 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
- Air Cylinder thrust calculation
- 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 (2 π/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 φ40 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
- Ensure the ratchet mechanism has sufficient strength.
The bending stress needs to be 29 (N/mm²) or less and the shearing stress needs to be 24.7 (N/mm²) or less. - Ensure the indexing positioning part is strong enough to apply the required torque.
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