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| | | Permissible Moment (LM Guide) The SKR-type's LM guide section can carry moment loads in all directions, even though it uses only one nut block. Table 5 shows the permissible static moment values in the M M and MC directions. | | |
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| | | Use of one long type block (type A) Mr | | Use of one short type block (type C) MB | | |
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| | | Use of two long type blocks closely linked together (type B) Use of two short type blocks closely linked together (type D) Figure 7 Permissible Static Moment in Each Direction | | |
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| | | Table 5 Permissible Static Moment | | Unit: N-m | | |
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| | | | | | | | | | | | Model | Permissible Static Moment | | | | | Mb | Mc | | | | SKR33 - A | 173 | 173 | 424 | | | | SKR33 - B | 990 | 990 | 848 | | | | SKR33 - C | 58 | 58 | 240 | | | | SKR33 - D | 390 | 390 | 480 | | | | SKR46 - A | 579 | 579 | 1390 | | | | SKR46 - B | 3240 | 3240 | 2780 | | | | SKR46 - C | 236 | 236 | 870 | | | | SKR46 - D | 1460 | 1460 | 1740 | | | | | | | | | | | |
| | | Note 1: Symbol A, B, C, or D at the end of the model number represents the type of nut block and the number of them in use. A: long type block, one piece used B: long type block, two pieces closely linked together C: short type block, one piece used D: short type block, two pieces closely linked together Note 2: The permissible static moments for the SKR-B or SKR-D type show a value applicable when two nut blocks are used and closely linked together. | | |
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| | | Life Span | | |
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| | | The SKR-type LM guide actuator with Caged Ball Technology consists of the LM guide, ball screw, and support bearing. The life span of each constituting component can be calculated based on the basic dynamic rated load shown in Rated Loads (Table 4 on p. 6). • Calculation of Life Span 1) LM Guide ■ Rated Life Span The rated life span (L) refers to the total traveling distance that 90% of a group of the same LM guides can achieve without flaking (flakes peeling off the metal surface) when these LM guides are individually moved under the same conditions. The rated life span of the LM guide can be obtained by equation (1). | | |
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| | | L = | | x 50 | | |
| | | "(1) | | |
| | | f -P | | |
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| | | | | | | | | | where | | | | | L : rated life span | (km) | | | | C : basic dynamic rated load | (N) | | | | Pc : calculated carrying load | (N) | | | | fw : load factor | (see Table 7) | | | | fc : contact factor | (see Table 6) | | | | | | | | | |
| | | If moment is acted on the SKR-type when using the SKR-A/-C type or the SKR-B/-D type of closely linked double nut blocks, multiply the acting moment by the equivalent coefficient shown in Table 8 to calculate equivalent load. P = K • M m where Pm : Equivalent load (per block) (N) K : Moment-equivalent factor M : Operating moment (N-mm) (If the SKR-type is used using three or more nut blocks or with the span separated, contact THK.) Particularly, if moment acts upon the SKR-B or SKR-D, use the following equation: D Kc • Mc | | |
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| | | • If a radial load (P) and moment load act on the SKR-type simultaneously, use the following equation to calculate the life span: PE = Pm + P where PE : Total equivalent radial load (N) | | |
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