Efdyn Main Catalog
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Strokes: 1” to 3” Bores: 7/8” and 1 1/8” Effective Weights: 10 - 75,000 (Lbs) Energy Per Hour: 1,475,000 - 3,600,000 (In-Lbs)

HORIZONTAL APPLICATION EXAMPLES W V FP DC DR P = Moving Weight, lbs = Impact Velocity, ft/sec = Total Propelling Force, lbs = Propelling Cylinder Bore, inches = Propelling Cylinder Rod Diameter, inches = Pressure in Propelling Cylinder, psi HP = Horsepower of Drive Motor SF = Stall Factor: 2.5 for A.C. Motor, 3.5 for D.C. Motor S = Shock Absorber Stroke, inches C = Number of Cycles per Hour EK = Kinetic Energy, in.- lbs EP = Propelling Force Energy, in.- lbs EC = Energy per Cycle, in.- lbs EH = Energy per Hour, in.- lbs/hr WE = Effective Weight, lbs WEV 2 = Parameter for use with Size...

VERTICAL & INCLINED APPLICATION EXAMPLES W V FE FP L = Moving Weight, lbs = Impact Velocity, ft/sec = External Propelling Force, lbs = Total Propelling Force, lbs = Total Distance Moved by Weight, including stroke inches = Shock Absorber Stroke, inches = Number of Cycles per Hour = Kinetic Energy, in.- lbs = Propelling Force Energy, in.- lbs = Energy per Cycle, in.- lbs EH = Energy per Hour, in.- lbs/hr WE = Effective Weight, lbs WE V 2= Parameter for use with Size Selection Tables A = Angle of Inclined Plane from Horizontal, deg *For impact velocities of less than 1 ft/sec consult EFDYN...

ROTARY APPLICATION EXAMPLES W V WA ω θ I K T = Moving Weight, lbs = Impact Velocity, ft/sec = Apparent Weight at Shock Absorber, lbs = Angular Velocity, deg/sec = Angle from Vertical at Impact, deg = Moment of Inertia, lb-ft-sec2 = Radius of Gyration, inches = Propelling Torque, lb-inch = Mounting Radius of Shock, inches = Radius to Edge of Turntable, inches = Total Propelling Force, lbs = Shock Absorber Stroke, inches = Thickness of Object, inches = Length of Object, inches = Distance from Pivot to C.G. of Weight, inches = Number of Cycles per Hour SIZING FORMULAS FORMULAS: VERTICAL AXIS,...

HORIZONTAL AXIS, UNIFORM ARM WA = W•(H2+4•L2)/(12•RS2) V = RS•ω/688 FP = [T+.5•L•W•Sin(θ)]/RS EK = 0.187•WA•V2 EP = FP•S EC = EK+EP EH = C•EC WE = EC/(.187•V2) WEV2 = EC/.187 = 500 lbs; ω = 150 /sec; T = 9,000 lb-in.; RS = 18 in.; H = 2 in.; L = 36 in.; θ = 75 ; C = 100/hr; S = 3 in. = 500•[(2)2+4•(36)2]/[12•(18)2] = 667 lbs = 18•(150)/688 = 3.92 ft/sec = [9,000+.5•(36)•(500)•Sin(75 )]/18 = 983 lbs = 0.187•(667)•(3.92)2 = 1,920 in.-lbs EP = 983•(3) = 2950 in.-lbs EC = 1,920 + 2,950 = 4,870 in.-lbs EH = 100•(4,870) = 487,000 in.-lbs/hr WE = 4,870/[.187•(3.92)2] = 1690 lbs WEV2 = 4,870/.187 =...

Application Worksheet At EFDYN, we want our customers to be totally satisfied with their purchase. Therefore, each EFDYN Shock Absorber is tailored to your load requirements regardless of whether it is a standard or a custom-orificed unit. In order to do so, the following data is necessary to ease the process of sizing and selecting your ideal shock absorber. Please fax, phone, or email worksheet data to EFDYN, and we will send you a detailed assessment of your application and product proposals. If you are interested in a custom designed shock, please indicate any special information or a...

• Flange and Footlug mounts available H Self Compensating Minibuffers • Operating Temperature: 14° to 176°F (-10° to 80°C) EFM Series • Two locknuts provided with each minibuffer SIZE SELECTION EFFECTIVE WEIGHT In/Sec (m/sec)

Adjustable Minibuffers EFMA & EFA Series • Operating Temperature: 14° to 176°F (-10° to 80°C) • Two locknuts provided with each minibuffer • Flange and Footlug mounts available SPECIFICATIONS: EFA & EFMA MINIBUFFERS DIMENSIONS IN INCHES (MM) MODEL EFMA 7-15-1C EFMA 7-15-6C EFMA 20-16-1C EFMA 10-20-1C EFMA 10-20-6C EFMA 11-25-1C EFMA 11-25-6C EFMA 27-25-6C EFA 20-50-FC EFA 20-50-RC SIZE SELECTION MAX EFFECTIVE WEIGHT MODEL EFMA 7-15-1C EFMA 7-15-6C ENERGY ENERGY PER CYCLE PER HOUR In/Sec (m/sec)

MOTION MANAGEMENT Horizontal Impact Horizontal Impact Horizontal Impact With Pushing Porce Horizontal Impact With Rotation Impact with Some Incline Effective Impact Absorption Energy Free Fall Impact Cylinder Bottoming Cylinder Topping Effective Impact Absorption Energy We = Effective Impact Weight [kgf (lbs.)] to = Angular Velocity [rad/s (rad/s)] Application: Factory Conveyor Example A - Speed and weight of conveyed object is constant, needing only a fixed setting Mini buffer. Select EFM 11-25-1 from specification chart on page 26 Example B - Two different object are conveyed, requiring...

ENERGY PER CYCLE (In-lbs) ENERGY PER HOUR (In-lbs) SELF CONTAINED HOW TO ORDER SAS SHOCK ABSORBERS INFORMATION NEEDED FOR SIZING SHOCKS The model designation for SAS self-adjusting shock absorbers is a coded description of the unit defined as shown in this example. Efdyn’s Self Adjusting Shock Absorber Nominal Bore Size 3/4 or 1 1/8 Stroke Length Mounting Style • P-Primary • B-Sq. Back Flange • F-Sq. Front Flange • BT-Rectangular Back Flange • R-Rod Eye • C-Rod Clevis • H-Hinge Mount • L-Lug Mount (Front & Rear) FT-Rectangular Front Flange Selected Piston Rod Metering Return Method S-Spring...

MOTION MANAGEMENT *Metric thread is m64 x 2.0 (available on the 11/8" bore model only) COMMON DIMENSIONS IN INCHES * Use 2.75 on 6" stroke spring return

WE EFFECTIVE WEIGHT (lbs.) LM (LIGHT) ENERGY ENERGY PER HOUR (In-lbs) PER CYCLE (In-lbs) SELF CONTAINED AIR RETURN HOW TO ORDER SAS SHOCK ABSORBERS INFORMATION NEEDED FOR SIZING SHOCKS The model designation for SAS self-adjusting shock absorbers is a coded description of the unit defined as shown in this example. Efdyn’s Self Adjusting Shock Absorber Nominal Bore Size 1 1/2 or 2 Stroke Length Mounting Style • P-Primary • B-Sq. Back Flange • F-Sq. Front Flange • BT-Rectangular Back Flange • R-Rod Eye • C-Rod Clevis • H-Hinge Mount • L-Lug Mount (Front & Rear) • FT-Rectangular Front Flange...