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No.000187 Traverse mechanism for heavy workpieces
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Converting rotary motion into linear motion
Related Category
Linear Guides for Extra Super Heavy Load
| Product name | Linear Guides/Extra Super Heavy Load/With Resin Retainer |
|---|---|
| Part number | SE2RZ36-1120 |
| Features | Recirculating bearing balls are separated by resin retainers resulting in low-noise and smooth movements of the guide. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Choose the size based on workload.
Available sizes
■Linear Guides for Extra Super Heavy Load with Plastic Retainers, Interchangeable, Light Preload
| Material | Hardness |
|---|---|
| Carbon Steel | 58HRC - |
■Sizes and Dimensions
| Number of Blocks | Block Width | Block Length | Overall Height | Rail Length |
|---|---|---|---|---|
| 1 | 44 | 91.8 | 30 | 220 - 1960 |
| 48 | 107 | 36 | 220 - 1960 | |
| 60 | 124.6 | 42 | 280 - 1960 | |
| 2 | 44 | 91.8 x 2pcs. | 30 | 220 - 1960 |
| 48 | 107 x 2pcs. | 36 | 220 - 1960 | |
| 60 | 124.6 x 2pcs. | 42 | 280 - 1960 |
* Please see the product pages for details of selectable sizes.
Selection Steps
■Linear guide selection steps
- Determine application conditions
- (Moving mass, feed rate, motion pattern, life)
↓
- Temporary selection of linear guide specifications
- (Block type, overall height, rail length are temporarily selected according to the conditions of use.)
↓
- Basic safety check
-
- ●Allowable Load
- ●Operating Life
- ●Preload
Accuracy Info
■Preload and Accuracy Reference (Linear Guides for Extra Super Heavy Load with Plastic Retainers, Interchangeable, Light Preload)
(µm)
| Radial Clearance | H30 ･ H36 | -5 ~ 0 |
|---|---|---|
| H42 | -7 ~ 0 | |
| H Dimension Tolerance | ±20 | |
| Pair variation of H | 15 | |
| Tolerance of dims. W2 | ±30 | |
| Pair variation of W2 | 25 | |
Performance info.
■Linear guide performance info. (Linear Guides for Extra Super Heavy Load with Plastic Retainers, Interchangeable, Light Preload)
| Overall Height | Basic Load Rating | Allowable Static Moment | |||
|---|---|---|---|---|---|
| C (Dynamic) kN | Co (Static) kN | MA N･m | MB N･m | Mc N･m | |
| 30 | 21.6 | 44.5 | 360 | 305 | 298 |
| 36 | 32.0 | 62.5 | 615 | 515 | 490 |
| 42 | 46.0 | 91.5 | 1000 | 885 | 870 |
Technical Calculations
■Linear guide life calculations
- ●Life
- When linear guides operate in linear motion while supporting loads, repeated stresses apply on the rolling elements (balls) and raceways (rails), eventually causing scale-like flaking due to material fatigue. The total run distance until this flaking appears is defined as linear guide's "Life".
- ●Rated Life
- Rated life is a total distance 90% of linear guides reach without flaking when a group of the same guides are run under the same condition. The rated life can be calculated with basic dynamic load rating and the load applied on the guides as follows.
-
- When using linear guides, load calculations are initially needed. It is not easy to calculate the loads during linear motion due to vibrations and shocks, as well as load distribution on the guides. Furthermore, operating environment temperature has large effect on life. When these conditions are taken in consideration, the calculations would be as follows.
-
- L: Rated Life (km)
- fH: Hardness Factor (See Fig-1)
- fT: Temperature Factor (See Fig-2)
- fC: Contact Factor (See Table-1)
- fW: Load Factor (See Table-2)
- C: Basic Dynamic Load Rating (N)
- P: Applicable Load (N)
- ●Hardness factor (fH)
-
In using linear guides, the shaft that balls contact must have sufficient hardness, If adequate hardness cannot be obtained, load rating decreases and life will be reduced as a result.
- ●Temperature factor (fT)
-
When the temperature of linear guides exceed 100°C, hardness of blocks and rails will be reduced, causing reduction of life. Please compensate the life rating with temperature factor.
* Please use linear guides within temperature shown on product pages.
- ●Contact factor (fC)
-
Table-1. Contact factor
Number of blocks per rail Contact factor fC
1 1.00 2 0.81 3 0.72 4 0.66 5 0.61 In general, it is common to use 2 or more blocks on 1 rail. In such case, load applicable on each block would not be uniform due to machining variations. As the result, allowable load rating on each block would vary depending on the number of blocks used per rail. Please compensate the life rating with contact factor shown on Table-1.
- ●Load Factor (fW)
-
Table-2. Load factor
Condition of Use fw No external shocks or vibrations and
speed is low 15m/min or less1.0 - 1.5 No significant shocks or vibration and
med. speed 60m/min or less1.5 - 20 External shocks and vibrations exist
and the speed is high 60m/min or over2.0 - 3.5 To calculate load applied to the Linear Guides, in addition to object weight, it requires inertia force attributed to motion velocity or moment loads. 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. Thus, Table-2 load factor helps simplify the life calculation.
- ●Applicable load calculation method
- When load is applied to the a block, convert moment load into applied load by the following formula.
-
- P: Applicable Load (N)
- F: Downward load (N)
- Co: Static load rating (N)
- MA: Allowable Static Moment - Pitching Direction (N･m)
- MC: Allowable Static Moment - Rolling Direction (N･m)
- Lp: Load point distance (m) in pitching Direction
- Lr: Load point distance (m) in rolling direction
Keyless Bushings
| Product name | Keyless Bushings/Standard |
|---|---|
| Part number | MLHS35 |
| Features | A hub (such as pulleys, gears and sprockets) can be easily connected with shaft by tightening mechalock screws. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Size according to pulley size, shaft size and allowable transmitted torque.
Available sizes
■MechaLock Standard Type (with Centering Function)
| Body Material | Surface Treatment |
|---|---|
| EN 1.1191 Equiv. | - |
| Black Oxide | |
| Electroless Nickel Plating | |
| EN 1.4301 Equiv. | - |
■Sizes and Dimensions
| Shaft Bore Dia. | Outer Ring Dia. (pilot) | Inner Ring O.D. (shoulder) | Shoulder Height | Pilot Length |
|---|---|---|---|---|
| Ø28 | Ø46 | Ø50 | 3.5 | 17.3 |
| Ø30 | Ø48 | Ø52 | ||
| Ø32 | Ø50 | Ø54 | 18.3 | |
| Ø35 | Ø57 | Ø62 | 4 | 19.5 |
| Ø38 | Ø60 | Ø65 | 20 | |
| Ø40 | Ø62 | Ø67 | 20.5 | |
| Ø42 | Ø64 | Ø69 | ||
| Ø45 | Ø67 | Ø72 | 21 |
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.
■Load info of the MechaLock Standard Type (with Centering Function)
| Shaft Bore Dia. | EN 1.1191 Equiv. / -, EN 1.1191 Equiv. / (Black Oxide) | EN 1.1191 Equiv. / Electroless Nickel Plating | EN 1.4301 Equiv. / - | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Max Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | Screw Tightening Torque | Max. Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | Max Allowable Torque | Allowable Thrust Load | Screw Tightening Torque | |
| (N･m) | (N･m) | |||||||||
| (N･m) | (kN) | No Surface Treatment | Black Oxide | (N･m) | (kN) | (N･m) | (N･m) | (kN) | (N･m) | |
| Ø28 | 380 | 27 | 8.8 | 7.5 | 295 | 21.1 | 8.8 | 213.8 | 15.2 | 5.6 |
| Ø30 | 410 | 396 | 26.4 | 229.5 | 15.3 | |||||
| Ø32 | 440 | 423 | 244.2 | 15.2 | ||||||
| Ø35 | 720 | 41.1 | 15.7 | 12.7 | 548 | 31.3 | 15.7 | 301.1 | 17.16 | 9.6 |
| Ø38 | 770 | 40.2 | 741 | 39 | 409 | 21.48 | ||||
| Ø40 | 810 | 779 | 430.6 | |||||||
| Ø42 | 850 | 823 | 39.2 | 452.2 | ||||||
| Ø45 | 1200 | 52.9 | 882 | 484.6 | ||||||
Adjusting Bolts
| Product name | Adjusting Bolts/Knurled head with Hex Socket |
|---|---|
| Part number | AJKTN10-50 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Easy to use/operate to adjust belt tension.
Available sizes
■Adjusting Bolt with Hex Socket Knurled Knobs
| Screw Type | Material | Surface Treatment |
|---|---|---|
| Coarse Thread | EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating | ||
| EN 1.4301 Equiv. | - | |
| Fine thread | EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating |
■Sizes and Dimensions
| Thread Dia. x Pitch | Thread Length (5mm increments) | Block Bearing Part | Knob | EN 1.1191 Equiv. | EN 1.4301 Equiv. | |||
|---|---|---|---|---|---|---|---|---|
| Fine Thread | Coarse Thread | Diameter | Length | Length | O.D. | |||
| - | M3 x 0.5 | 10 ~ 45 | Ø2.5 | 7 | 7 | Ø10 | ○ | - |
| M4 x 0.5 | M4 x 0.7 | 10 ~ 60 | Ø3.5 | ○ | ○ | |||
| M5 x 0.5 | M5 x 0.8 | 10 ~ 70 | Ø4.5 | 9 | 15 | Ø15 | ○ | ○ |
| M6 x 0.75 | M6 x 1.0 | 15 ~ 80 | Ø5.5 | ○ | ○ | |||
| M8 x 0.75 | M8 x 1.25 | 20 ~ 100 | Ø7.5 | 12 | ○ | ○ | ||
| M10 x 1.0 | M10 x 1.5 | 25 ~ 100 | Ø9.5 | 16 | 25 | Ø20 | ○ | - |
| M12 x 1.0 | M12 x 1.75 | 25 ~ 150 | Ø11.5 | 19 | ○ | - | ||
| - | M16 x 2.0 | 25 ~ 150 | Ø15.5 | Ø24 | ○ | - | ||
Accuracy Info
■Accuracy of the Adjusting Bolts
Block Support
Shaft Dia. Tolerance: -0.1 / -0.2
Length Tolerance: +0.2 / +0.1
Surface Roughness: Ra1.6
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Application Overview
Purpose
- Traverse mechanism using linear guides that support load that reduces needed transportation power.
- The shuttle mechanism converts rotary motion from the servomotor into linear motion of the plate on linear guides via a shaft, a pulley, and a belt.
Points for use
- Automatic mechanism by a servomotor.
Target workpiece
- Large trey + workpieces.
- External dimensions: W125 x D125 x H150mm (carrying max. 12 pieces per pallet)
- Workpiece weight: 535kg
Design Specifications
Operating Conditions or Design Requirements
- Slide stroke: 500mm
- External dimensions: W700 x D1890 x H228mm
Required Performance
- Trey positioning repeatability: ±0.02mm
- Transportable weight: 535 x µ ( = 0.03) = 16.05kg
Selection Criteria for Main Components
- Motor
- To meet requirement for high accuracy positioning.
- Linear guide
- Reducing the transport weight.
- To meet requirement for reciprocating straight movement accuracy.
Design Evaluation
Verification of main components
- Verify the timing belt and the servomotor for durability against load weight and meeting the requirement for transportation speed.
- Timing belt
- Allowable tension: 4320N
- Servomotor maximum torque: 14.4N･m
- Motor shaft dia.: 0.035m
- Maximum torque at pulley diameter 0.098m: 14.4 x 0.098 / 0.035 = 40.3N･m
- Force applied to one belt: F = (40.3 x 2 / 0.098) / 2 = 408N
408N < 4320N Thus, no problem.
- Servomotor
- Motor rotational speed: 0 - 2000 (rpm)
- Internal reduction ratio (ia): 1 / 9
- External reduction ratio (ib): 40 (Ø80)/49 (Ø98)
- Rotary pitch circle dia. (Dp): 80mm
- Transportation speed: (Ns) x (Dp) x π x (ia) x (ib) x 1 / 60
= 600 x 80 x π x (1 / 9) x (40 / 49) x 1 / 60 = 228mm/sec
(Calculated by assuming applied rotational speed (Ns) of 600rpm)
Other Design Consideration
- For stable and synchronous transmission L-type timing belt is selected.
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