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No.000152 Lifter Mechanism
15
15
Lifting mechanism guided by interlocking gears
Relevant category
Miniature Linear Guides
| Product name | Miniature Linear Guides Standard Blocks, Light Preload, Precision Class L Configurable Type |
|---|---|
| Part number | SEB10-55 |
| Features | The most basic type among all the industry standard-compliant blocks. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective when linear motions are needed in limited space
Available sizes
■Miniature Linear Guides (standard blocks, light preloading, slight clearance)
| Material | Hardness |
|---|---|
| Stainless steel | 56HRC～ |
| Carbon steel Carbon Steel (Alloy Steel including SCM) | 58HRC～ |
■Sizes and Dimensions
| Number of Blocks | Block Width | Block Length | Overall Height | Rail Length |
|---|---|---|---|---|
| 1 | 12 | 17.4 | 6 | 25-100 |
| 17 | 23.6 | 8 | 40-130 | |
| 20 | 30 | 10 | 35-275 | |
| 27 | 33.9 | 13 | 45-470 | |
| 32 | 42.4 | 16 | 70-670 | |
| 40 | 50 | 20 | 100-700 | |
| 2 | 12 | 17.4 x 2pcs. | 6 | 70-100 |
| 17 | 23.6 x 2pcs. | 8 | 70-130 | |
| 20 | 30 x 2pcs. | 10 | 75-275 | |
| 27 | 33.9 x 2pcs. | 13 | 95-470 | |
| 32 | 42.4 x 2pcs. | 16 | 110-670 | |
| 40 | 50 x 2pcs. | 20 | 160-700 |
Selection Steps
- Determination on Operating Conditions
- (Moving mass, feed rate, motion pattern, life)
↓
- Temporary selection of linear guide specifications
- (Number of blocks, block type, height and rail length are temporarily selected based on the usage conditions.)
↓
- Basic safety check
-
- Allowable Load
- Operating Life
- Preload
Accuracy Info
■Preload and Accuracy Standards (standard blocks, light preload, slight clearance)
(μm）
| Specification | Light Preload, High Grade | Light Preload, Precision Grade | Slight Clearance, Standard Grade |
|---|---|---|---|
| Radial Clearance | -3-0 | 0～+15 | |
| H Dimension Tolerance | ±20 | ±10 | ±20 |
| Pair variation of H | 15 | 7 | 40 |
| Tolerance of dims. W2 | ±25 | ±15 | ±25 |
| Pair variation of W2 | 20 | 10 | 40 |
■Running Parallelism
(μm）
| Rail length(mm) | ||||||||
|---|---|---|---|---|---|---|---|---|
| -80 | 81-200 | 201-250 | 251-315 | 316-400 | 401-500 | 501-630 | 631-700 | |
| Precision Grade | 2 | 3 | 3.5 | 4 | 5 | 5 | 6 | 6 |
| High Grade | 3 | 7 | 9 | 11 | 11 | 12 | 13.5 | 14 |
| Standard Grade | 13 | 15 | 17 | 18 | 18 | 19 | 21 | 21.5 |
* The slight clearance type has clearances (play) between the rail and blocks.
Performance info.
Rated Load of Linear Guide (wide standard blocks, slight clearance)
| Overall Height | Basic Load Rating | Allowable Static Moment | |||
|---|---|---|---|---|---|
| C (Dynamic) kN | Co (Static) kN | MA N・m | MB N・m | Mc N・m | |
| 6 | 0.3 | 0.6 | 0.8 | 0.8 | 1.5 |
| 8 | 0.9 | 1.5 | 4.1 | 4.1 | 5.2 |
| 10 | 1.5 | 2.5 | 5.1 | 4.1 | 10.2 |
| 13 | 2.2 | 3.3 | 8.8 | 9.5 | 16.1 |
| 16 | 3.6 | 5.4 | 21.6 | 23.4 | 39.6 |
| 20 | 5.2 | 8.5 | 48.4 | 48.4 | 86.4 |
Technical Calculations
Operating Life Calculation for Linear Guides
- Life
- When the linear guide is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the stress works on the rolling elements (steel balls) and the rolling contact surfaces (rails) constantly. Total travel distance until the first flaking occurs is called the life of linear guides.
- Rated Life
- Rated life is the total travel distance that 90% of linear guides of the same type can reach, under the same conditions, with no occurrence of flaking damage. Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear guides, as shown below.
-
- Load must be calculated before actually using linear guides. To obtain loads during linear reciprocating motion, it is necessary to fully consider vibrations and impacts during motion as well as distribution condition of the load applied to linear guides. So, it is not easy to calculation the loads. Operating temperature also critically affects the life. Considering these conditions, the above-mentioned calculation formula will 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: Applied Load (N)
- Hardness factor (fH)
-
For liner guide applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.
Please correct the rated life with the hardness factor.
- Temperature Factor (fT)
-
When the temperature of linear guides exceeds 100°C, the hardness of guides and shafts will be reduced, and the allowable loads will also be reduced compared to being used at room temperature, causing a reduction of life. Please correct the rated life with the temperature factor.
* Please use Linear Guides at within the heat resistance temperature ranges 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 For actual applications, more than two blocks are generally used per shaft. In this case, the load applied to each block varies depending on machining precision and is not uniformly distributed. As a result, per-block allowable load varies depending on the number of blocks per rail. Please compensate the rated life with contact factors on Table-1.
- Load Factor (fW)
-
Table-2. Load factor
Condition of Use fw No shocks / vibrations, low speed:
15 m/min. or less1.0-1.5 No significant shocks / vibrations,
medium speed: 60 m/min. or less1.5-20 With shocks / vibrations, high
speed: 60 m/min. or more2.0-3.5 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 calculate 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.
- Applied Load P Calculation Method
- When moment load is applied to each block, convert the moment load into applied load by the following formula.
-
- P: Applied Load (N)
- F: Downward load (N)
- C0: 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
Spring Plungers
| Product name | Spring Plungers - Stainless Steel |
|---|---|
| Part number | PJXW4-4 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective as space saving and low price components for positioning reaction force
Available sizes
■Spring Plungers - Stainless Steel
| Nose Material | Load Type | Body | Pin | Spring | Operating Temperature | |
|---|---|---|---|---|---|---|
| Material | Material | Hardness | Material | |||
| Stainless Steel | Ultra Light Load | 304 Stainless Steel | 440C Stainless Steel | 55HRC〜 | 631 Stainless Steel | －30〜260℃ |
| Light Load | ||||||
| Heavy Load | ||||||
| Extra Heavy Load | ||||||
| Plastic | Ultra Light Load | Polyacetal | − | －30〜80℃ | ||
| Light Load | ||||||
| Heavy Load | ||||||
| Extra Heavy Load | ||||||
■Sizes and Dimensions
| Screw Dia. (Coarse) | Nose | Body length | |
|---|---|---|---|
| Diameter | Stroke | ||
| M3 | φ1 | 1.5 | 15 |
| 3 | 15 | ||
| M4 | φ1.6 | 2 | 15 |
| 4 | 24 | ||
| M5 | φ2 | 3 | 20 |
| 5 | 27 | ||
| M6 | φ2.5 | 3 | 25 |
| 5 | 30 | ||
| M8 | φ3.1 | 3 | 25 |
| 5 | 27 | ||
| M10 | φ3.8 | 5 | 30 |
| 10 | 43 | ||
| M12 | φ5.5 | 5 | 30 |
| 10 | 43 | ||
| 15 | 51 | ||
| M16 | φ8 | 10 | 57 |
| 15 | 57 | ||
| 20 | 65 | ||
Performance info.
■Spring Load (N) of Spring Plunger (Stainless Steel)
| Load type | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Screw Dia. (Coarse) | Nose | Ultra Light Load | Light Load | Heavy Load | Extra Heavy Load | |||||
| Diameter | Stroke | min． | max． | min． | max． | min． | max． | min． | max． | |
| M3 | φ1 | 1.5 | 0.1 | 0.4 | 0.4 | 1.3 | 0.8 | 2.9 | 1.1 | 3.4 |
| 3 | 0.1 | 0.4 | 0.2 | 1.3 | 0.6 | 2.9 | 0.8 | 3.4 | ||
| M4 | φ1.6 | 2 | 0.3 | 0.7 | 0.9 | 2.0 | 2.0 | 8.8 | 6.1 | 13.8 |
| 4 | 0.2 | 0.7 | 0.6 | 2.1 | 1.9 | 8.8 | 5.8 | 13.6 | ||
| M5 | φ2 | 3 | 0.4 | 3.0 | 1.4 | 9.7 | 2.7 | 16.3 | 6.8 | 22.0 |
| 5 | 0.4 | 3.0 | 1.1 | 10.3 | 1.0 | 17.1 | 5.7 | 21.5 | ||
| M6 | φ2.5 | 3 | 1.8 | 3.1 | 6.0 | 9.8 | 8.0 | 26.4 | 15.8 | 35.6 |
| 5 | 1.5 | 3.1 | 3.4 | 9.86 | 4.4 | 26.6 | 12.9 | 34.4 | ||
| M8 | φ3.1 | 3 | 1.9 | 3.2 | 6.0 | 9.9 | 14.7 | 27.0 | 21.9 | 36.3 |
| 5 | 1.4 | 3.2 | 4.0 | 9.83 | 6.7 | 26.6 | 14.7 | 34.5 | ||
| M10 | φ3.8 | 5 | 1.6 | 4.6 | 5.7 | 14.7 | 8.2 | 45.7 | 24.5 | 58.6 |
| 10 | 1.6 | 4.6 | 4.4 | 14.7 | 6.2 | 45.1 | 19.8 | 58.7 | ||
| M12 | φ5.5 | 5 | 1.7 | 4.7 | 5.8 | 14.7 | 18.2 | 49.0 | 34.9 | 63.6 |
| 10 | 1.6 | 4.7 | 5.0 | 14.7 | 8.2 | 49.1 | 25.5 | 63.6 | ||
| 15 | 1.8 | 4.7 | 6.9 | 14.7 | 7.5 | 48.9 | 20.1 | 63.7 | ||
| M16 | φ8 | 10 | 2.8 | 10.8 | 9.2 | 34.2 | 18.9 | 68.5 | 38.7 | 88.4 |
| 15 | 2.6 | 10.8 | 8.6 | 34.4 | 14.4 | 68.6 | 33.9 | 88.1 | ||
| 20 | 2.0 | 11.0 | 7.1 | 34.4 | 4.2 | 68.6 | 25.4 | 88.1 | ||
* Min. is the initial load, and max. is the load when the nose is fully compressed.
Adjusting Stopper Screws
| Product name | Adjusting Stopper Screws- Hexagon Socket, L Configurable, Fine Thread |
|---|---|
| Part number | ANBNS4-25 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective in that existing product can be used as the pin for determining the reference position.
Available sizes
■Adjusting Pin (Wit hex socket)
| Adjustment Screw | Material | Hardness | Surface Treatment |
|---|---|---|---|
| Fine Thread | 1045 Carbon Steel | 45-50HRC | Electroless Nickel Plating |
| Trivalent Chromate | |||
| 4137 Alloy Steel | 50HRC- | ||
| 304 Stainless Steel | － | － | |
| 420 Stainless Steel | 45HRC- | － | |
| Coarse Thread | 1045 Carbon Steel | 45-50HRC | Electroless Nickel Plating |
| Trivalent Chromate | |||
| 4137 Alloy Steel | 50HRC- | ||
| 304 Stainless Steel | － | － | |
| 420 Stainless Steel | 45HRC- | － |
| Screw Shaft Dia. (mm) | Length(mm) |
|---|---|
| 3 | 10-40（Increments of 5） |
| 4 | 10-50（Increments of 5）、60 |
| 5 | 10-50（Increments of 5）、60 |
| 6 | 15-50（Increments of 5）、60 |
IDEA NOTE Position setting before insertion of workpiece
Due to the arrangement of the spring plungers and mounting screws at both ends of each liner guide, adjustment of chuck position to center before insertion of workpiece is facilitated.
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Application Overview
Purpose
- Purpose
- To fit bushings onto a roughly positioned pin.
- Operation
- This mechanism is designed to perform floating in the X and Y directions via two linear guides installed between the lift unit and the bushing chuck. Before the bushing is fit on the pin, the bushing chuck is at the center position. The lift unit lowers the bushing and bushing chuck. The bushing is floated toward the pin and then fit on the pin. After fitting the bushing, the bushing chuck is returned to the center by the spring plunger.
Target workpiece
- (1) Bushing
- Shape: cylinder
- Size: φ20 x H20mm
- Weight: 7g
- (2) Pin
- Shape: column
- Size: φ7 x H15mm
- Weight: 110g
Design Specifications
Operating Conditions or Design Requirements
- Vertical stroke by lift unit: 38mm
- Allowable maximum displacement between inserted workpiece: L = 1.5mm
- Outer dimensions: W88 x D100 x H96mm
Required Performance
- Positioning accuracy: ±0.1mm
Selection Criteria for Main Components
- Spring Plungers
- To enable the bushing chuck to be returned to the center position when the inserted workpiece is unclamped, select spring plungers whose minimum load is larger than the seal resistance of the linear guide, which is between 2N and 5N.
Design Evaluation
Verification of main components
- Compare the centering force against the spring plunger clamp force to see whether the workpiece can be centered
- Check the centering force of the inserted workpiece and the spring plunger clamp power
- Conditional value: centering pin taper angle of inserted workpiece θ = 23°, downward clamp force of lift unit P = 30N, gravitational acceleration g = 9.8m/s², friction coefficient: µ = 0.2 (metal and metal)
- Friction angle: ψ, from μ = tanψ, ψ = tan - 1μ = tan - 1 (0.2) = 11.3°
- The inserting workpiece centering force F is, from P = F x tan (θ + ψ), F = P/(tan (θ + ψ)) = 30/(tan (23 + 11.3)) = 44.0N
- Spring plunger clamp power PS = 5.8 to 13.6N = inserting workpiece centering force F = 44.0N
⇒ As the inserting workpiece centering force is sufficiently larger than the spring plunger clamp power, centering cannot be achieved. The chuck position should be returned to the center before workpiece insertion.
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