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28 Online at www.imi-precision.com 1 28 MAGNETICALLY COUPLED RODLESS CYLINDERS For further information visit www.imi-precision.com, and use the new, improved search function. If you are unable to find the option you require please call: (937) 833-4033. Shock Absorber (MC2/MC3 and MC2S/MC3S) Shock Absorber/Stroke Adjustment (in) BORE A B C D E F 5/16" (031) 0.215 0.750 0.000 0.785 1.093 3/8-32 UNEF 7/16" (043) 0.218 0.750 0.000 0.780 1.093 3/8-32 UNEF 9/16" (056) 0.406 1.460 0.375 1.094 1.594 7/16-28 UNEF 3/4" (075) 0.406 1.335 0.375 1.438 1.469 7/16-28 UNEF 7/8" (087) 0.500 2.490 0.375 1.562 1.438 1/2-20 UNF 1-1/16" (106) 0.594 2.490 0.375 1.875 1.438 1/2-20 UNF 1-1/4" (125) 0.656 2.890 0.500 2.062 1.500 3/4-16 UNF 1-1/2" (150) 1.000 2.890 0.562 2.219 1.438 3/4-16 UNF 2" (200) 1.125 3.500 0.562 3.312 1.563 1-12 UNF Selecting the proper shock absorber model is accomplished using the shock absorber graph given for each bore. The intersection of the total energy per stroke "ET", and velocity at shock absorber contact "V", indicates the proper shock absorber model. ET is calculated by the equation given below using values determined for: ET (Total energy) equals the sum of EK (Kinetic energy) and EW (Work energy) NOTE: the Work energy calculation varies with mounting position, EWH Horizontal, or EWV Vertical. EK = ((WU + UF2) / 772) x V2 (Kinetic energy, in-lbs) EWH = UF1 x SF x P (Work energy, in-lbs) HORIZONTAL EWV = ((UF1 x P) + WU + UF2) x SF (Work energy, in-lbs) VERTICAL Example: determine the proper shock absorber for a guided model mounted vertically with an attached load of 15 lbs, operating air pressure of 80 PSI, and a velocity of 20 in/sec, at a cycle rate of 3,600 per hour. P = 80 PSI V = 20 in/sec S = 6 in WU = 15 lbs C = 3,600 cycles/hr From the charts for a 3/4" bore MC2S/MC3S SF = 0.410 UF1 = 0.442 UF2 = 1.565 EK = (15 lbs + 1.565) / 772) x (20 in/sec)2 EK = 8.56 in-lbs EWV = ((0.442 x 80 PSI) + 15 lbs + 1.565 x 0.410 EWV = 21.29 in-lbs ET = EK + EWV = 29.85 in-lbs ETC = ET x C = 107,457 in-lbs/hr Checking specifications chart, both ET and ETC are less than maximum. Per the sizing graph for a model MC3S–075 with 21.29 in-lbs total energy at 20 in/sec velocity, use a heavy duty model MCHS–075 shock absorbers. P = Air pressure (PSI) V = Velocity at impact (in/sec) W U = Load attached to the MC2/MC3 mounting plate (lbs.) C = Cycles per hour SF = Shock factor UF1 = Ultran factor #1 UF2 = Ultran factor #2 B A F D 1.00 OF ADJUSTMENT E A F D C C ShoCk AbSorbEr StrokE ADjuStMENt NOTE: Do not let the shock absorbers bottom out. The shock should not be used as a stroke adjuster. A stop collar is needed for the shock if stroke adjustment is required. How to Size a Shock Absorber