Calculating the Equivalent Load
Rated Load of an LM Guide in Each Direction
The LM Guide is categorized into roughly two types: the 4-way equal load type, which has the same rated load in the radial, reverse radial and lateral directions, and the radial type, which has a large rated load in the radial direction. With the radial type LM Guide, the rated load in the radial direction is different from that in the reverse radial and lateral directions. The basic load rating in the radial direction is indicated in the specification table. The values in the reverse-radial and lateral directions are obtained from Table7.
Rated Loads in All Directions
| Type | Load Distribution Curve |
|---|---|
|
4-way Equal Load Type  |
 |
|
Radial Type  |
 |
| Classification | Model No. | Reverse radial direction |
Lateral directions |
|||
|---|---|---|---|---|---|---|
| Type | Size | Dynamic load rating CL |
Static load rating C0L |
Dynamic load rating CT |
Static load rating C0T |
|
| 4-way Equal Load |
SHS | C | C0 | C | C0 | |
| SHW | C | C0 | C | C0 | ||
| SRS | 12,15,25 | C | C0 | C | C0 | |
| SCR | C | C0 | C | C0 | ||
| EPF | C | C0 | C | C0 | ||
| HSR | C | C0 | C | C0 | ||
| NRS | 75,85,100 | C | C0 | C | C0 | |
| HRW | 17,21,27,35,50,60 | C | C0 | C | C0 | |
| RSX | 12,15 | C | C0 | C | C0 | |
| RSR | 2,3 | C | C0 | C | C0 | |
| CSR | C | C0 | C | C0 | ||
| MX | C | C0 | C | C0 | ||
| JR | C | C0 | C | C0 | ||
| HCR | C | C0 | C | C0 | ||
| HMG | C | C0 | C | C0 | ||
| HSR-M1 | C | C0 | C | C0 | ||
| RSX-M1 | 12,15 | C | C0 | C | C0 | |
| RSR-M1 | 9 | C | C0 | C | C0 | |
| HSR-M2 | C | C0 | C | C0 | ||
| HSR-M1VV | C | C0 | C | C0 | ||
| SRG | C | C0 | C | C0 | ||
| SRN | 35,45,55,65 | C | C0 | C | C0 | |
| SRW | C | C0 | C | C0 | ||
| Radial | SSR | 0.50C | 0.50C0 | 0.53C | 0.43C0 | |
| SVR | 0.64C | 0.64C0 | 0.47C | 0.38C0 | ||
| SR | 15,20,25,30,35,45,55,70 | 0.62C | 0.50C0 | 0.56C | 0.43C0 | |
| SR | 85,100,120,150 | 0.78C | 0.71C0 | 0.48C | 0.35C0 | |
| NR-X | 0.64C | 0.64C0 | 0.47C | 0.38C0 | ||
| NR | 75,85,100 | 0.78C | 0.71C0 | 0.48C | 0.45C0 | |
| HRW | 12,14 | 0.78C | 0.71C0 | 0.48C | 0.35C0 | |
| NSR | 0.62C | 0.50C0 | 0.56C | 0.43C0 | ||
| SR-M1 | 0.62C | 0.50C0 | 0.56C | 0.43C0 | ||
| Other | SVS | 0.84C | 0.84C0 | 0.92C | 0.85C0 | |
| NRS-X | 0.84C | 0.84C0 | 0.92C | 0.85C0 | ||
| SRS | 5,7,9,20 | C | C0 | 1.19C | 1.19C0 | |
| RSX | 5,7,9 | C | C0 | 1.19C | 1.19C0 | |
| RSR | 14 | 0.78C | 0.70C0 | 0.78C | 0.71C0 | |
| HR | C | C0 | C | C0 | ||
| GSR | 0.93C | 0.90C0 | (T) 0.84C* (C) 0.93C* |
(T) 0.78C0* 0.90C0* |
||
| GSR-R | 0.93C | 0.90C0 | (T) 0.84C* (C) 0.93C* |
(T) 0.78C0* 0.90C0* |
||
| RSX-M1 | 9 | C | C0 | 1.19C | 1.19C0 | |
| RSR-M1 | 12,15,20 | 0.78C | 0.70C0 | 0.78C | 0.71C0 | |
- * (T): Tensile lateral direction; (C): Compressive lateral direction
- Note) C and C0in the table each represent the basic load rating indicated in the specification table of the respective model. F0represents the permissible load.For types with no size indication in the table, the same factor is applied to all sizes.Models HR, GSR and GSR-R cannot be used in single-axis applications.
Equivalent Load PE
The LM Guide can bear loads and moments in all directions, including a radial load (PR), reverse radial load (PL) and lateral loads (PT), simultaneously.When two or more loads (e.g., radial load and lateral load) are simultaneously applied to the LM Guide, the service life and the static safety factor are calculated using equivalent load values obtained by converting all the loads into radial load or reverse radial load.
Equivalent Load Equation
When the LM block of the LM Guide receives loads simultaneously in the radial and lateral directions, or the reverse radial and lateral directions, the equivalent load is obtained from the equation below.
PE=X･PR(L)+Y･PT
|
PE |
Equivalent load (N)･Radial direction･Reverse radial direction |
|---|---|
|
PL |
Reverse radial load (N) |
|
PT |
Lateral load (N) |
|
X,Y |
Equivalent factor (see Table8) |
| Classification | Model No. | If radial and lateral loads are applied simultaneously  |
If reverse-radial and lateral loads are applied simultaneously  |
|||
|---|---|---|---|---|---|---|
| Equivalent in radial direction  |
Equivalent in reverse radial direction  |
|||||
| Type | Size | X | Y | X | Y | |
| 4-way Equal Load |
SHS | 1.000 | 1.000 | 1.000 | 1.000 | |
| SHW | 1.000 | 1.000 | 1.000 | 1.000 | ||
| SRS | 12,15,25 | 1.000 | 1.000 | 1.000 | 1.000 | |
| SCR | 1.000 | 1.000 | 1.000 | 1.000 | ||
| EPF | 1.000 | 1.000 | 1.000 | 1.000 | ||
| HSR | 1.000 | 1.000 | 1.000 | 1.000 | ||
| NRS | 75,85,100 | 1.000 | 1.000 | 1.000 | 1.000 | |
| HRW | 17,21,27,35,50,60 | 1.000 | 1.000 | 1.000 | 1.000 | |
| RSX | 12,15 | 1.000 | 1.000 | 1.000 | 1.000 | |
| RSR | 2,3 | 1.000 | 1.000 | 1.000 | 1.000 | |
| CSR | 1.000 | 1.000 | 1.000 | 1.000 | ||
| MX | 1.000 | 1.000 | 1.000 | 1.000 | ||
| JR | 1.000 | 1.000 | 1.000 | 1.000 | ||
| HCR | 1.000 | 1.000 | 1.000 | 1.000 | ||
| HMG | 1.000 | 1.000 | 1.000 | 1.000 | ||
| HSR-M1 | 1.000 | 1.000 | 1.000 | 1.000 | ||
| RSX-M1 | 12,15 | 1.000 | 1.000 | 1.000 | 1.000 | |
| RSR-M1 | 9 | 1.000 | 1.000 | 1.000 | 1.000 | |
| HSR-M2 | 1.000 | 1.000 | 1.000 | 1.000 | ||
| HSR-M1VV | 1.000 | 1.000 | 1.000 | 1.000 | ||
| SRG | 1.000 | 1.000 | 1.000 | 1.000 | ||
| SRN | 1.000 | 1.000 | 1.000 | 1.000 | ||
| SRW | 1.000 | 1.000 | 1.000 | 1.000 | ||
| Radial | SSR | - | - | 1.000 | 1.155 | |
| SVR | - | - | 1.000 | 1.678 | ||
| SR | 15,20,25,30,35,45,55,70 | - | - | 1.000 | 1.155 | |
| SR | 85,100,120,150 | - | - | 1.000 | 2.000 | |
| NR-X | - | - | 1.000 | 1.678 | ||
| NR | 75,85,100 | - | - | 1.000 | 2.000 | |
| HRW | 12,14 | - | - | 1.000 | 2.000 | |
| NSR | - | - | 1.000 | 1.155 | ||
| SR-M1 | - | - | 1.000 | 1.155 | ||
| Other | SVS | 1.000 | 0.935 | 1.000 | 1.020 | |
| NRS-X | 1.000 | 0.935 | 1.000 | 1.020 | ||
| SRS | 5,7,9,20 | 1.000 | 0.839 | 1.000 | 0.839 | |
| RSX | 5,7,9 | 1.000 | 0.839 | 1.000 | 0.839 | |
| RSR | 14 | 1.000 | 0.830 | 1.000 | 0.990 | |
| HR | 1.000 | 0.500 | 1.000 | 0.500 | ||
| GSR | 1.000 | 1.280 | 1.000 | 1.000 | ||
| GSR-R | 1.000 | 1.280 | 1.000 | 1.280 | ||
| RSX-M1 | 9 | 1.000 | 0.839 | 1.000 | 0.839 | |
| RSR-M1 | 12,15,20 | 1.000 | 0.830 | 1.000 | 0.990 | |
- Note) If the radial type LM Guide receives radial and lateral loads simultaneously, study the safety static factor and the rated load in the radial-load and lateral-load directions.For types with no size indication in the table, the same factor is applied to all sizes.Models HR, GSR and GSR-R cannot be used in single-axis applications.
