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- inCAD Library Home
- > No.000260 Rotating and Raising Mechanism
No.000260 Rotating and Raising Mechanism
27
Lifting and rotating mechanism
Relevant category
Angular Contact Bearings with Housings
| Product name | Angular Contact Bearings with Housings - Back-to-Back Combination + Deep Groove Ball Bearing, Flanged Type |
|---|---|
| Part number | ABGC7004-N-80 |
| Features | Angular Contact Bearings with Housings - Flanged type with Deep Groove Ball Bearings set in Back-to-Back Combination. |
Selection criteria
To handle the changes in work piece weight as well as the durability issues a angular contact bearing is used.
Available sizes
■Angular Contact Bearings with Housings - Back-to-Back Combination + Deep Groove Ball Bearing, Flanged Type
| (1) Angular Contact Bearings | (3) Holder, (4) Inner Ring Spacer, (5) Standard Cover, (6) Standard Cover, Oil Seal Cover, or O-Ring Cover, (7) Inner Ring Collar | (8) Cover Mounting Screw | ||
|---|---|---|---|---|
| (2) Deep Groove Ball Bearings | ||||
| Material | Material | Surface Treatment | Material | Surface Treatment |
| 52100 Bearing Steel | 1045 Carbon Steel | Black Oxide | 4137 Alloy Steel | Black Oxide |
| Electroless Nickel Plating | 304 Stainless Steel | - | ||
■Sizes and Dimensions
| Bearing No. | Cover Selection | Overall Length | |
|---|---|---|---|
| 7002 | Standard Oil Seal For O-Ring | 60 | 75 |
| 7003 | 70 | 85 | |
| 7004 | 80 | 100 | |
| 7005 | 100 | 125 | |
| 7006 | 120 | 150 | |
| 7007 | 140 | 175 | |
| 7008 | 160 | 200 | |
| 7009 | 180 | 225 | |
| 7010 | 200 | 250 | |
Stand Brackets
| Product name | Brackets for Device Stands and Tightening from Separate Side- Flanged |
|---|---|
| Part number | PFPM20 |
| Features | Can be fastened from the back side. |
Selection criteria
Select a reversed fastening type to firmly secure the shafts.
Available sizes
■Brackets for Device Stands and Tightening from Separate Side- Flanged
| Type | Material | Surface Treatment |
|---|---|---|
| Flange Pilot Flanged | 1045 Carbon Steel | Black Oxide |
| Electroless Nickel Plating | ||
| 304 Stainless Steel | - |
■Sizes and Dimensions
| Stand Shaft Bore Dia. | Flange O.D. | Flange Wrench Flats | Overall Length | Post Mounting Screws |
|---|---|---|---|---|
| 6 | 28 | 12 | 16 | M3 |
| 8 | 32 | 15 | 22 | M4 |
| 10 | 38 | 18 | 26 | M5 |
| 12 | 42 | 20 | 32 | M6 |
| 13 | ||||
| 15 | 48 | 32 | 40 | M8 |
| 16 | ||||
| 20 | 55 | 38 | 50 | M10 |
| 25 | 75 | 50 | 62 | M12 |
| 30 | 80 | 55 | 75 | M16 |
Flanged Linear Bushings
| Product name | Flanged Linear Bushings - Center Flange |
|---|---|
| Part number | LHMRWMF20 |
| Features | A load can be placed near the center of the linear bushing to evenly distribute the load and space. |
Selection criteria
Select a center flanged type so that the plate moving up and down is positioned at the center of the bearing.
Available sizes
■Flanged Linear Bushings - Center Flange
| Type | Outer Cylinder | Ball | Retainer | Operating Ambient Temperature | Accessory | ||
|---|---|---|---|---|---|---|---|
| Material | Hardness | Surface Treatment | Material | Material | |||
| Round Flange Square Flange Compact Flange | 52100 Bearing Steel | 58HRC－ | - | 52100 Bearing Steel | Plastic (Duracon M90 Equivalent) | -20－80℃ | Seal: Material Nitrile Rubber (-20 to 120°C) |
| Stainless(SUS) | -20－100℃ | ||||||
| Electroless Nickel Plating | 440C Stainless Steel | Plastic (Duracon M90 Equivalent) | -20－80℃ | ||||
| Stainless Steel (SUS) | -20－100℃ | ||||||
| 440C Stainless Steel | 56HRC－ | - | Plastic (Duracon M90 Equivalent) | -20－80℃ | |||
| Stainless Steel (SUS) | -20－100℃ | ||||||
■Sizes and Dimensions
| I.D. (mm) | Length (mm) |
|---|---|
| 6 | 35 |
| 8 | 45 |
| 10 | 55 |
| 12 | 57 |
| 13 | 61 |
| 16 | 70 |
| 20 | 80 |
| 25 | 112 |
| 30 | 123 |
| 35 | 135 |
| 40 | 151 |
| 50 | 192 |
Selection steps
■Linear Bushing Selection Steps
- Determine conditions of use
- (Loads, Motion pattern, Life hours)
↓
- Temporarily select the specifications of linear bushings
- (Shaft dia. and length are temporarily selected according to the conditions of use.)
↓
- Basic safety check
-
- ●Basic Static Load Rating
- ●Basic Dynamic Load Rating
- ●Allowable Static Moment
- Operating Life
↓
- Considerations Based on Required Performance
- ●Life Variations Due to Temperature Changes
Accuracy Info
■Accuracy Info. of Flanged Linear Bushings
(mm)
| I.D. | I.D. Tolerance | Overall Length Tolerance |
|---|---|---|
| 6 | 0 -0.010 | ±0.3 |
| 8 | ||
| 10 | ||
| 12 | ||
| 13 | ||
| 16 | ||
| 20 | 0 -0.012 | |
| 25 | ||
| 30 | ||
| 35 | 0 -0.015 | |
| 40 | ||
| 50 |
Performance info.
■Speeds / Loads (Load Info.) of Flanged Linear Bushings
| I.D. (mm) | Basic Load Rating | |
|---|---|---|
| Basic Dynamic Load Rating (N) | Basic Static Load Rating (N) | |
| 6 | 324 | 529 |
| 8 | 431 | 784 |
| 10 | 588 | 1100 |
| 12 | 657 | 1200 |
| 13 | 813 | 1570 |
| 16 | 1230 | 2350 |
| 20 | 1400 | 2740 |
| 25 | 1560 | 3140 |
| 30 | 2490 | 5490 |
| 35 | 2650 | 6270 |
| 40 | 3430 | 8040 |
| 50 | 6080 | 15900 |
Technical calculations
■Life of Flanged Linear Bushings
When the linear system is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the repeated stress is applied on the rolling elements and the rolling contact surfaces constantly. Total travel distance until the first flaking occurs is called the life of linear system.
Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear bushings, as shown below.
- L: Rated Life (km)
- fH: Hardness Factor (See Fig.1)
- fT: Temperature Factor (See Fig.2)
- fC: Contact Factor (See Table-3)
- fW: Load Factor (See Table-4)
- C: Basic Dynamic Load Rating (N)
- P: Applied Load (N)
Hardness Factor (fH)
For liner system applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.
Fig. 1. Hardness Factor
Temperature Factor (fT)
When the temperature of linear system exceeds 100°C, the hardness of the system and shafts will be reduced and the allowable loads will also be reduced compared to being used at room temperature, resulting in a shorter life.
Fig. 2. Temperature Factor
Contact Factor (fC)
More than two linear systems are used for one shaft in general. In this case, the load applied to each linear system varies depending on machining precision and is not uniformly distributed. As a result, allowable load per linear system changes depending on the number of linear systems used on one shaft.
Table-3. Contact Factor
| Number of Bearings Installed on One Shaft | Contact Factor fC | |
|---|---|---|
| 1 | 1 | |
| 2 | 0.81 | |
| 3 | 0.72 | |
| 4 | 0.66 | |
| 5 | 0.61 | |
Load Factor (fW)
To calculate load applied to the linear system, in addition to object weight, it requires inertia force attributed to motion velocity or moment loads. Further, it is necessary to accurately determine the temporal change of each. However, it is difficult to calculation the load accurately due to potential vibrations and shocks caused by other element than repeated start-stop motions during reciprocating motion. Therefore, use the table below in order to simplify the life calculations.
| Conditions of Use | fw |
|---|---|
| No shocks / vibrations, low speed: 15m/min. or less | 1.0～1.5 |
| No significant shocks / vibrations, medium speed: 60m/min. or less | 1.5～2.0 |
| With shocks / vibrations, high speed: 60m/min. or more | 2.0～3.5 |
Life in hours can be obtained by calculating the travel distance per hour. When the stroke length and the number of strokes are constant, it can be calculated using the formula below.
- Lh: Life (Hr.)
- L: Rated Life (km)
- Ls: Stroke length (m)
- n1: Number of Cycles per Minute (cpm)
IDEA NOTE Rotates workpieces with timing pulley
By mounting a work piece receiving plate just above the driven side of the pulley, and held with a double rowed angular contact bearing, the work piece weight against the motor and accuracy are improved.
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Application Overview
Purpose
- Simplified multiple movement mechanism.
Points for use
- Blower included within the cylindrical thin plastic work pieces serves as a cleaning mechanism.
- The work piece is raised into the fixed blower, at this point through the rotation and movement cleaning can be implemented from all angles of the work piece.
Target workpiece
- Long cylindrical workpiece.
- External dimension: φ160xH90mm
- Workpiece weight: 219g
Design Specifications
Operating Conditions or Design Requirements
- Specifications for workpiece operation
- Rotating angle: 360deg; Rotational speed: 0.5rev/sec = 3.14rad/sec
- Elevation stroke: 100mm; Elevation velocity: 100mm/sec
- Equipment dimensions
- External dimensions: W480xD125xH413mm
- Depth of underneath the table: 408mm
Required Performance
- Specifications for workpiece operation
- Rotation start time: 0.1sec
- Elevation start time: 0.1sec
Selection Criteria for Main Components
- Rotational torque of motor gear head.
- Thrust of cylinder.
Design Evaluation
Verification of main components
- Verification of the motor torque and cylindrical thrust required below.
- Rotational torque of motor gear head (60Hz)
- Rated rotational speed of motor: 1575 [Hz]→Gear head reduction ratio: (1575/60)/0.5 = 52.5 → 50 is adopted
- Starting torque of motor: 0.17N・m →Gear head conversion: 0.17×50 = 8.5N・m
- Allowable torque of gear head: 5.29N・m (from catalog) < 8.5 →5.29N・m is adopted
- Total inertia of rotating part: J = 6083kg・mm²=6083×10-6kg・m²
- Rotation start time: 0.1sec → Rotation start angular acceleration: dω/dt = 3.14 / 0.1 = 31.4rad/sec²
- Required torque of rotating part: Tr = dω/dt ×J = 31.4 ×6083×10-6 = 0.191N・m
- Belt overload coefficient Ks = 1.6 (catalog value), Required torque of driving side: 0.191×1.6 = 0.306N・m
- Safety factor: 5.29/0.306 = 17.3
- Thrust of cylinder
- Total weight of elevating part: 10.68kg, Acceleration for vertical push: g + dv/dt = 9.8 + 1 = 10.8m/sec²
- Required thrust of cylinder: F = 10.68×10.8 = 115.5N
- Operating pressure: 0.5MPa; Theoretical output of push side: 628N (from catalog)
- Safety factor: 628/115.5 = 5.44
- Specifications for workpiece operation
- Elevation start time: 0.1sec → Elevation start acceleration: dv/dt = 100 / 0.1 = 1000mm/sec² = 1m/sec²
Other Design Consideration
- Through the use of a timing pulley, the accuracy of the work piece angle can be improved.
- By separating the motor gear head and the rotating portion of the work piece, the overhang load of the gear head can be avoided.
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