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No.000163 Simplified Indexing Table
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Cost effective indexing table.
Relevant category
Urethane Rollers
| Product name | Urethane Rollers - Set Screw Holes |
|---|---|
| Part number | UMHS30-8 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Select a roller with hardened urethane to transmit the drive force of the motor to the turntable.
Available sizes
■Urethane Rollers - Set Screw Type
| Core material | Lining | Hardness |
|---|---|---|
| 304 Stainless Steel | Urethane | Shore A90 |
| Shore A70 | ||
| Shore A50 | ||
| 5052 Aluminum Alloy | Shore A90 | |
| Shore A70 | ||
| Shore A50 |
■Sizes and Dimensions
| O.D. | I.D. |
|---|---|
| φ15 | φ4 |
| φ5 | |
| φ20 | φ4 |
| φ5 | |
| φ25 | φ6 |
| φ8 | |
| φ30 | φ6 |
| φ8 | |
| φ35 | φ8 |
| φ10 | |
| φ40 | φ8 |
| φ10 | |
| φ50 | φ10 |
| φ12 |
Guides
| Product name | Guides- L-Shaped |
|---|---|
| Part number | WGLNC-20-10-10 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable as a guide for square workpieces
Available sizes
■Workpiece guide (L shaped Standard type)
| Material | Hardness | Surface Treatment |
|---|---|---|
| 1045 Carbon Steel | ― | Black Oxide |
| Electroless Nickel Plating | ||
| 40HRC－ | Black Oxide | |
| Electroless Nickel Plating | ||
| 2017 Aluminum Alloy | ― | ― |
| 304 Stainless Steel | ||
| Polyacetal | ||
| MC Nylon | ||
| Conductive MC Nylon R2 | ||
| Tetrafluoroethylene |
■Sizes and Dimensions
| One side (mm) | Height (1 mm Increments) | Installation Hole Dia. (mm) |
|---|---|---|
| 20－50(Increments of 10) | 10－30 | 3.5 |
| 20－50(Increments of 10) | 4.5 | |
| 30－60(Increments of 10) | 5.5 | |
| 30－60(Increments of 10) | 15－30 | 6.5 |
| 40－60(Increments of 10) | 9 |
Accuracy Info
■Accuracy of workpiece guide
Perpendicularity: 0.05
IDEA NOTE Separation of drive source
During maintenance the indexing table is disengaged.
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* The part in the frame is a sub-assembly unit.
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Application Overview
Purpose
- Purpose
- Indexing table used in magazine transfer.
- Operation
- A geared motor drives a urethane roller which turns the indexing table. A deceleration sensor is used in conjunction with a stop sensor to slowly bring the table to a stop. A wedge is used to physically top the rotation of the table.
Points for use
- Disengage the indexing table during maintenance.
The indexing table is operated slowly.
Target workpiece
- Shape: Magazine
- Size: W80xD50xH140mm
- Weight: 1.5kg
Design Specifications
Operating Conditions or Design Requirements
- Index table outer diameter: φ290mm
- 4 positions
- Cycle time: 1 second for 1 position
- Outer dimensions: W516xD290xH195mm
Required Performance
- Positioning accuracy: ±0.5mm
- Load weight: 1.5×4=6kg
Selection Criteria for Main Components
- Variable geared motor
- As the index table cycle time t is 1 second per position, it takes 4 seconds to rotate one revolution. Therefore, the table rotation speed Nt is 15 rpm.
- As the outer diameter D1 of the part driven by the urethane roller of the geared motor is φ240 and the diameter D2 of the urethane roller of the geared motor is φ30, the rotation speed N of the geared motor is D1/D2 x Nt = 240/30 x 15 = 120rpm.
- A variable geared motor with a variable range of 90 to 1200rpm and a gear head with a reduction ratio i of 1/3 are selected, and the range of variable rotation speed after deceleration should be set to 30 to 400.
Design Evaluation
Verification of main components
- Need to ensure the geared motor allowable torque satisfies the necessary load torque.
- Confirmation of load torque of geared motor
- Conditional value: index table rotation speed: Nt = 15 rpm, outer diameter of table driven part: D1 = φ240mm, diameter of the urethane roller of geared motor: D2 = φ30mm, cycle time: t = 1sec, moment of inertia of rotating part including workpiece: J = 0.083kg・m2
- Rotation speed of geared motor: N = D1/D2 x Nt = 240/30 x 15 = 120rpm
- Load torque of geared motor: T = J/(9.55 x 104) x N/t = 0.083/(9.55 x 104) x 120/1 = 1.04 x 10??N・m
- Allowable torque of geared motor when gear head is mounted (when reduction ratio i = 1/3): Tmax = 0.06N・m
⇒Load torque: T = 1.04 x 10??N・m
＜ allowable torque: Tmax = 0.06N・m Therefore, the load torque of geared motor is within the allowable range.
- Confirmation of gear head overhang load
- As the allowable overhang load of the gear head used in this device is 98N at the output shaft center, the allowable overhang load of this device is 98N x 16mm／32mm = 49N.
⇒φAs the theoretical thrust of φ16 cylinder on the push side is 40N when the operating pressure is 0.2MPa, the cylinder that presses against motor is used at 0.2MPa.
- As the allowable overhang load of the gear head used in this device is 98N at the output shaft center, the allowable overhang load of this device is 98N x 16mm／32mm = 49N.
Other Design Consideration
- Micro photo sensor is used as a confirmation and deceleration sensor.
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