LM Guide THK - Industrial Technologies

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Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Calculating the Average LoadIn cases where the load applied to each LM block fluctuates under different conditions, such as anindustrial robot holding a work with its arm as it advances and receding with its arm empty, and amachine tool handling various workpieces, it is necessary to calculate the service life of the LM Blockwhile taking into account such fluctuating loading conditions.The average load (Pm) is the load under which the service life of the LM Guide is equivalent to thatunder varying loads applied to the LM blocks.Pm : Average load (N)ni 1Pn : Varying load (N)Pm = • ∑ (Pni •Ln)LL : Total travel distance (mm)n=1Ln : Distance traveled under load Pn (mm)i : Constant determined by rolling elementNote) The above equation or the equation (1) below applies when the rolling elements are balls.(1) When the load fluctuates stepwiseLM Guide Using Balls (i =3)31 333Pm = (P1 •L1 + P2 •L2 ······ +Pn •Ln) 1LPm : Average load (N)Pn : Varying load (N)L : Total travel distance (mm)Ln : Distance traveled under Pn (mm)LM Guide Using RollersPm =1031L1010(i = )3333(P1 •L1 + P2 •L2 ······ +Pn •Ln)Pm : Average Load (N)Pn : Varying load (N)L : Total travel distance (mm)Ln : Distance traveled under Pn (mm)1010Load (P)2P1P2PmIndustrial TechnologiesPnL1 L2 LnTotal travel distance (L)A1-72
Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Point of SelectionCalculating the Average Load(2) When the load fluctuates monotonicallyPm13(Pmin + 2•Pmax)3Pmin : Minimum load (N)Pmax : Maximum load (N)Load (P)PmaxPmPminTotal travel distance (L)(3) When the load fluctuates sinusoidally(a) Pm 0.65Pmax 4 (b) Pm 0.75Pmax5PmaxPmaxPmPmLoad (P)Load (P)LM GuideIndustrial TechnologiesTotal travel distance (L)Total travel distance (L)A1-73
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LM Guide THK - Industrial Technologies

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