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No.000222 Stepped Feed Mechanism Using Cylinder
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Cylinder-driven stepped feed
Related Category
Miniature Cam Followers
| Product name | Miniature Cam Followers |
|---|---|
| Part number | CFFAM3-6 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Create even intervals for height adjustment of workpiece supporting plate.
Available sizes
■Miniature Cam Followers (General)
| Material |
|---|
| EN 1.3505 Equiv.(Stud: EN 1.7242 Equiv.) |
| EN 1.4125 Equiv. |
■Sizes and Dimensions
| Shaft Dia. (mm) | Outer Ring Dia. (mm) |
|---|---|
| 2.5 | 5 |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | 12 |
Accuracy Info
■Cam follower accuracy
| Shaft Dia. (mm) | Shaft Dia. Tolerance (mm) |
|---|---|
| 2.5 | 0 -0.006 |
| 3 | |
| 4 | 0 -0.008 |
| 5 | |
| 6 |
Performance info.
■Speeds / Loads (Load Info) of the Cam Followers
| Shaft Dia. (mm) | Basic Load Rating | Max. allowable load (N) | Rotational speed limit (rpm) | |
|---|---|---|---|---|
| Basic dynamic load rating (N) | Basic staic load rating(N) | |||
| 2.5 | 350 | 285 | 285 | 3360 |
| 3 | 565 | 525 | 525 | 2800 |
| 4 | 915 | 915 | 915 | 2100 |
| 5 | 1340 | 1400 | 1400 | 1680 |
| 6 | 1880 | 2040 | 2040 | 1400 |
Cylinders with Twin Guides
| Product name | Cylinders with Twin Guides |
|---|---|
| Part number | MGCLB12-10 |
| Features | Cylinder uses two rods and bushings for guidance and rigidity. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Design and stroke, since cylinders are used to press against cam followers.
Available sizes
■Cylinder with guides (Fix stroke type)
| Cyl. Bore | Bearing | Plain Bushing | Linear Ball Bushing | Cylinder width (mm) | Overall Length (Listed below + St) | Thickness (mm) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St | 10 | 20 | 25 | 30 | 40 | 50 | 75 | 100 | 10 | 20 | 25 | 30 | 40 | 50 | 75 | 100 | ||||
| Ø12 | ○ | ○ | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | ○ | ○ | ○ | ○ | ○ | 56 | 39 | 22 | |
| Ø16 | ○ | ○ | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | ○ | ○ | ○ | ○ | ○ | 62 | 43 | 25 | |
| Ø20 | - | ○ | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | ○ | ○ | ○ | ○ | ○ | 72 | 47 | 30 | |
| Ø25 | - | ○ | - | ○ | ○ | ○ | ○ | ○ | - | ○ | - | ○ | ○ | ○ | ○ | ○ | 86 | 47.5 | 38 | |
| Ø32 | - | - | ○ | - | - | ○ | ○ | ○ | - | - | ○ | - | - | ○ | ○ | ○ | 112 | 48 | ||
| Ø50 | - | - | ○ | - | - | ○ | - | ○ | - | - | - | - | - | - | - | - | 146 | 72 | 60 | |
Selection steps
■Cylinder Selection Steps
1. Define various conditions of the load.
↓
2. Calculate cylinder output (In case of double acting type)
↓
3. Determine the cylinder bore
↓
4. Determine the theoretical reference speed.
↓
5. Verify the cylinder's cushion mechanism.
↓
6. Verify the lateral load applied to the cylinder.
Accuracy Info
■Non-Rotational Accuracy
Non-Rotational Accuracy: A deviation angle centered on the piston rod, expressing the backlash caused by the clearance between the guide rod and the bearing.
| Cyl. Bore | Non-rotating Accuracy of Link Bar Tip | |
|---|---|---|
| Plain Bushing | Linear Bushing | |
| Ø12 | ±0.12° | ±0.06° |
| Ø16 | ±0.10° | ±0.06° |
| Ø20 | ±0.09° | ±0.05° |
| Ø25 | ±0.08° | ±0.05° |
| Ø32 | ±0.06° | ±0.04° |
| Ø50 | ±0.05° | - |
Performance info.
■Guided cylinder usage pressure range
Min. pressure(MPa): 0.1
Max. pressure(MPa): 1.0
Proof pressure(MPa): 1.5
(N)
| Cyl. Bore (mm) | Operating Direction | Operating Pressure (MPa) | |
|---|---|---|---|
| 0.4 | 0.5 | ||
| 12 | Outstroke | 45 | 57 |
| Instroke | 34 | 42 | |
| 16 | Outstroke | 80 | 101 |
| Instroke | 60 | 75 | |
| 20 | Outstroke | 126 | 157 |
| Instroke | 94 | 118 | |
| 25 | Outstroke | 196 | 245 |
| Instroke | 151 | 189 | |
| 32 | Outstroke | 322 | 402 |
| Instroke | 241 | 302 | |
| 50 | Outstroke | 785 | 982 |
| Instroke | 660 | 825 | |
■Allowable Lateral Load
(N･ｍ)
| Cyl. Bore (mm) | Stroke (mm) | |||||||
|---|---|---|---|---|---|---|---|---|
| 10 | 20 | 25 | 30 | 40 | 50 | 75 | 100 | |
| 12 | 24 | 19 | 16 | 14 | 12 | 37 | 31 | |
| 16 | 40 | 33 | 28 | 24 | 21 | 55 | 46 | |
| 20 | 52 | 45 | 39 | 35 | 55 | 46 | ||
| 25 | 69 | 60 | 52 | 47 | 73 | 62 | ||
| 32 | 166 | 131 | 107 | 91 | ||||
| 50 | 296 | 245 | 241 | |||||
Locating Pin
| Product name | Large Head Tapered High Hardness Stainless Steel/Press Fit/ Tapped/ Threaded |
|---|---|
| Part number | AFPBA5-P6-L10-B6 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective for using as the workpiece positioning pin
Available sizes
■Locating Pins - High Rigidity Stainless Steel, Large Head, Tapered
| Material | Hardness | Pin Shape | Shank Shape | |||
|---|---|---|---|---|---|---|
| High Rigidity Stainless Steel | Hardness: 35HRC ~ | Round | Press Fitm 6 | Press Fitp 6 | Tapped g6 | Threaded g6 |
| Diamond | ||||||
■Sizes and Dimensions of the Press-fit Type
| Shank Dia. | Pin Head Dia. 0.01 mm Increments | Shank Pilot Length Unit: 1 mm Increments | Pin Section Length Unit: 0.1 mm Increments |
|---|---|---|---|
| Ø2 | 2.50 ~ 8.00 | 3(4) ~ 16 | 1.0 ~ 15.0 |
| Ø3 | 3.50 ~ 8.00 | ||
| Ø4 | 4.50 ~ 8.00 | ||
| Ø5 | 5.50 ~ 8.00 | ||
| Ø6 | 6.50 ~ 10.00 | ||
| Ø8 | 8.50 ~ 10.00 | 4(5) ~ 16 |
The dimension in ( ) is applicable to Diamond Shape.
■Sizes and Dimensions of the Tapped Type
| Shank Dia. | Pin Head Dia. 0.01 mm Increments | Shank Pilot Length Unit: 1 mm Increments | Pin Section Length Unit: 0.1 mm Increments |
|---|---|---|---|
| Ø6 | 6.50 ~ 10.00 | 6(9) ~ 16 | 1.0 ~ 15.0 |
| Ø8 | 8.50 ~ 10.00 | 8(12) ~ 16 |
The dimension in ( ) is applicable to Diamond Shape.
■Sizes and Dimensions of the Threaded Type
| Shank Dia. | Pin Head Dia. 0.01 mm Increments | Shank Pilot Length Unit: 1 mm Increments | Pin Section Length Unit: 0.1 mm Increments |
|---|---|---|---|
| Ø3 | 3.50 ~ 8.00 | 3 ~ 10 | 1.0 ~ 15.0 |
| Ø4 | 4.50 ~ 8.00 | ||
| Ø5 | 5.50 ~ 8.00 | ||
| Ø6 | 6.50 ~ 10.00 | ||
| Ø8 | 8.50 ~ 10.00 | 4 ~ 10 |
Accuracy Info
■Accuracy of the Locating Pins - High Rigidity Stainless Steel, Large Head, Tapered
| Press Fit | Threaded | Tapped | ||
|---|---|---|---|---|
| Shank Dia. Tolerance | ｍ6 | g6 | g6 | g6 |
Pin Head Dia. Tolerance: 0/-0.01
Concentricity of the Shank Pilot and the Pin Head: Ø 0.01
IDEA NOTE Stepped feed achieved only by air cylinder
By combining the movements of four air cylinders - A: stopper pin cylinder, B: pitch feed cylinder, C: feed pin cylinder, D: return cylinder (balancer cylinder), stepped feed is performed.
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Application Overview
Purpose
- Purpose
- Performing pitch feed to a position for loading and unloading the workpiece stocker.
- Operation
- (1) Balancer cylinder descends to lower end, pitch feed cylinder descends, while stopper and feed pin cylinders are in retracted position.
(2) Stopper pin cylinder extends.
(3) Feed pin extends while stopper pin cylinder returns.
(4) Pitch feed cylinder ascends.
(5) Stopper pin extends and feed pin cylinder returns.
(6) Pitch feed cylinder descends, repeats (3) to (6) 12 times. (workpiece loading onto stacker)
(7) The balancer cylinder is at the upper end.
(8) Stopper pin returns.
(9) Returns to balancer cylinder lower end (unloading from stocker) (2).
* For the roles of the cylinders, refer to IDEA NOTE 1.
- (1) Balancer cylinder descends to lower end, pitch feed cylinder descends, while stopper and feed pin cylinders are in retracted position.
Target workpiece
- Shape: thin plate workpiece
- Size: W100 x D100 x t2.0 mm
- Weight: 0.03 kg
- Stocker (capable of mounting 12 thin plate workpieces)
- Size: W110 x D110 x H134 mm
Weight: 0.6 kg
Design Specifications
Operating Conditions or Design Requirements
- Ascending feed pitch: 10 mm
- Outer dimensions: W150 x D210 x H400 mm
Selection Criteria for Main Components
- Cam followers are used for position, retention/feed of the stacker. They are arranged at the same pitch as the stacker pitch.
- Select pitch feed cylinder to have same stroke as the stacker pitch.
- For the cylinders for stopper and push pin movement, select a stroke that allows the pin to escape.
Design Evaluation
Verification of main components
- Whether the selected cylinder is appropriate for the workpiece load is verified.
- Vertical feed Cylinder
- Conditional value: operating air pressure 0.5 (MPa), efficiency: 0.8
- Vertical feed cylinder thrust: 113 N
- Vertical feed cylinder thrust = cylinder thrust x efficiency = 113 x 0.8 = 90.4 N
Balancer Cylinder - Conditional value: operating air pressure 0.1 (MPa), efficiency: 0.8
- Cylinder theoretical thrust: 31 N
- Balancer cylinder thrust = cylinder thrust x efficiency = 31 x 0.8 = 24.8 N
Load factor - Conditional value: workpiece weight 0.03 (kg), stacker weight 0.6 (kg), weight of parts included in lift unit 1.8 (kg), number of workpieces 12
- From load = (workpiece weight + stacker weight + lift unit weight) x 9.8,
Load = (0.03 (kg) x 12 + 0.6 (kg) + 1.8 (kg)) x 9.8 = 27 N - From load factor (%) = (load/cylinder thrust) x 100,
Load factor = (27/ (90.4 + 24.8)) x 100 = 23.4(%) < 50 (%)
⇒Selected cylinder meet design requirements.
Other Design Consideration
- The balance cylinder of this mechanism is structured with an air regulator to prevent load from being applied to the stepped feed cylinder.
- By utilizing a cylinder with a stopper (an external stopper can also be used) as the vertical feed cylinder, fine adjustment is possible and a repeatability of ±0.05 mm is achieved.
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