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- > No.000117 Multi-Stroke Cam Mechanism
No.000117 Multi-Stroke Cam Mechanism
15
15
Multiple-step stroke with a minimum actuator
Relevant category
Linear Ball Bushings
| Product name | Short Stroke Ball Bushings - Single / Double |
|---|---|
| Part number | SLBUS16 |
| Features | Capable of rotary motion, finite linear motion, and the combination of both. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Bushing that can handle rotational and linear motions.
Available sizes
■Short Stroke Ball Bushings - Single / Double
| Outer Cylinder | Ball | Retainer | Operating Ambient Temperature | |
|---|---|---|---|---|
| Material | Hardness | Material | Material | |
| 52100 Bearing Steel | 58HRC- | 52100 Bearing Steel | 5052 Aluminum AlloyS | -20～110℃ |
| 440C Stainless Steel | 56HRC〜 | 440C Stainless Steel | -20～120℃ | |
■Sizes and Dimensions.
| (Shaft DIA.) | O.D. | Overall Length | Max. Stroke |
|---|---|---|---|
| φ5 | φ10 | 15 | 13 |
| φ6 | φ12 | 19 | 15 |
| φ8 | φ15 | 24 | 24 |
| φ10 | φ19 | 29 | 30 |
| φ12 | φ21 | 30 | 32 |
| φ13 | φ23 | 32 | 34 |
| φ16 | φ28 | 37 | 40 |
| φ20 | φ32 | 42 | 46 |
Selection steps
■Selection Steps of Linear Ball Bushings.
Accuracy Info
■Accuracy of Linear Ball Bushings - Single.
| (Shaft DIA.) | Outer Cylinder DIA. | Overall Length Tolerance | ||
|---|---|---|---|---|
| Tolerance | Tolerance | |||
| φ5 | 0/-0.008 | φ10 | 0/-0.009 | 0/-0.12 |
| φ6 | 0/-0.009 | φ12 | 0/-0.011 | 0/-0.2 |
| φ8 | φ15 | |||
| φ10 | φ19 | 0/-0.013 | ||
| φ12 | φ21 | |||
| φ13 | φ23 | |||
| φ16 | φ28 | |||
| φ20 | 0/-0.010 | φ32 | 0/-0.016 |
Performance info.
■Load Rating of Linear Ball Bushings - Single.
| (Shaft DIA.) | Basic Load Rating | |
|---|---|---|
| C (Dynamic) N | Co (Static) N | |
| φ5 | 131 | 106 |
| φ6 | 210 | 164 |
| φ8 | 323 | 278 |
| φ10 | 499 | 408 |
| φ12 | 722 | 579 |
| φ13 | 773 | 634 |
| φ16 | 1330 | 1029 |
| φ20 | 1609 | 1517 |
MechaLock - Compact Type
| Product name | Keyless Bushings - Compact |
|---|---|
| Part number | MLRS16 |
| Features | A hub (such as pulleys, gears and sprockets) can be easily connected with a shaft by screwing. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Fine rotational position adjustment for both the rotating actuator and eccentric cam.
Available sizes
■Keyless Bushings - Compact
| Body Material | Surface Treatment |
|---|---|
| 1045 Carbon Steel | − |
| 1045 Carbon Steel | Electroless Nickel Plating |
| 304 Stainless Steel | − |
■Sizes and Dimensions.
| Shaft Bore Dia. | Outer Ring DIA. (pilot) | Inner Ring O.D. (shoulder) | Shoulder Height | Pilot Length |
|---|---|---|---|---|
| φ10 | φ18 | φ31.5 | 11 | 12 |
| φ12 | φ20 | φ33.5 | ||
| φ14 | φ22 | φ35.5 | ||
| φ15 | φ23 | φ38.5 | 13 | 14 |
| φ16 | φ24 | φ39.5 | ||
| φ17 | φ25 | φ40.5 | ||
| φ18 | φ26 | φ46 | 16 | |
| φ19 | φ27 | φ47 | ||
| φ20 | φ28 | φ48 |
Accuracy Info
■Recommended Tolerance of Applicable Shaft and Hub.
| Tolerance | Finish Surface Roughness | |
|---|---|---|
| Shaft O.D. | h7(g6) | Ra1.6 or less |
| Hub I.D. | H7 | Ra3.2 or less |
Performance info.
■MechaLock Compact Type (with centering function).
| Shaft Bore Dia. | 1045 Carbon Steel/- | 1045 Carbon Steel/Electroless Nickel Plating | 304 Stainless Steel /- | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Max. Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | Max. Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | Max. Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | |
| (N・m) | (kN) | (N・m) | (N・m) | (kN) | (N・m) | (N・m) | (kN) | (N・m) | |
| φ10 | 44 | 8.71 | 4 | 44 | 8.71 | 4 | 14 | 2.75 | 2.7 |
| φ12 | 53 | 53 | 17 | ||||||
| φ14 | 61 | 61 | 20 | ||||||
| φ15 | 115 | 15.3 | 8 | 115 | 15.3 | 8 | 38 | 5 | 5.6 |
| φ16 | 123 | 123 | 41 | ||||||
| φ17 | 131 | 131 | 43 | ||||||
| φ18 | 210 | 23.2 | 14 | 210 | 23.2 | 14 | 68 | 7.4 | 9.6 |
| φ19 | 221 | 221 | 71 | ||||||
| φ20 | 233 | 233 | 75 | ||||||
IDEA NOTE Sets three positions via stroke and cam.
Cam rotation and linear stroke allow for three different positions to be set.
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Application Overview
Purpose
- To transfer workpiece using multiple steps.
- [Operation]
A linear movement/rotation actuator is used as a drive to preform a multi-step stroke with the help of an eccentric tapered cam.
The details of the multi-step stroke are shown below.
Position 1: Initial state in which the actuator is not operated.
Position 2: State in which the eccentric cam is rotated by 180° by the rotary stroke of the actuator.
Position 3: Tapered cam is moved 29.8mm by the linear stroke of the actuator.
Target workpiece
- Shape: circuit board carrier, tray.
size: W48 x D80 x H54mm.
weight: 0.6kg.
Design Specifications
Operating Conditions or Design Requirements
- Outer dimensions: W135 x D500 x H232.5mm
- Vertical stroke: 30mm
- Cylinder stroke: 29.8mm
Required Performance
- Weight: 1.1kg.
Selection Criteria for Main Components
- Swing cylinder.
- Torque of 0.4 N·m or more at oscillation angle of 180 degrees.
- Thrust in horizontal direction of 30 N or higher.
Design Evaluation
Verification of main components
- Verify if the cylinder can withstand the load torque and weight of the workpiece.
- Lifting thrust.
- Conditional value: workpiece mass W1 = 1.1 kg, gravitational acceleration g = 9.8 m/s ².
Cylinder thrust: F1 = 196 N, angle of eccentric cam: θ1 = 20°
Cylinder lifting thrust: F2 = F1/tan20° = 196/tan20° = 538.5N
Load F3 = Wg = 1.1 x 9.8 = 10.1N
F2＞F3.
- Conditional value: workpiece mass W1 = 1.1 kg, gravitational acceleration g = 9.8 m/s ².
- Torque.
- Conditional value: cylinder effective torque T1 = 0.422 N·m (air pressure 0.4 MPa),
Maximum distance from eccentric cam to load on the drawing when cylinder has stroked by 29.8 mm L1 = 0.0325 m
Load torque T2 = F3 x L1 = 0.328 N·m
T1＞T2.
- Conditional value: cylinder effective torque T1 = 0.422 N·m (air pressure 0.4 MPa),
Other Design Consideration
- By setting the length of the eccentric portion of the cam as twice the length of the vertical stroke produced by the taper, equal stroke is enabled.
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