Shock absorbers
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Catalog excerpts

Shock absorbers - 1

A shock absorber decelerates linearly. Roughly 90% of shock absorber applications can be modelled if the following 4 factors are known: 1. Mass to slow down m (kg) 2. Impact velocity vD (m/s) 3. Propelling force F (N) 4. Shocks per hour C (hr) Symbols used in the formulae: W1 Kinetic enerngy(Nm) W3 Total energy per cycle (W1+W2) (Nm) W4 Total erergy per hour (W3C) (Nm/hr) me Effective weight(kgme) m Mass to slow down_(kg) *v Velocity or moving mass_(m/s) *vp Impact velocity of shock absorber (m/s) w Angular velocity(rad/s) F Propelling force_(N) C Number of shocks per hour (/hr) ST Setting coefficient (normally 2.5) 1 a 2.5 1. Mass without propelling force Formulae : W1 = m v2 0,5 - 1-1 •i9p- 2. Mass with propelling force Formulae : W1 = m . v2.0,5 W2 = F . s W3 = W1 + W2 W4 = W3 . C , — 2.1 Mass moving upwards W2 = ( F - m . g ). s 2.2 Mass moving downwards W2 = ( F + m . g ). s 3. Mass pulled by a motor Formulae : W1 = m . v2.0,5 W2 = 1QQQ P STs 4. Mass on motorised rollers Formulae : W1 = m . v2 . 0,5 W2 = m . p . g . s W3 = W1 + W2 W4 = W3 . C v: = v 2 . W3 ^ ° ° f *v or vD is the impact velocity of the mass. In the case of an accelerated movement (for example when the mass is deplaced by a pneumatic cylinder), the impact velocity can be 1.5 to 2 times greater than the average velocity.

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Shock absorbers - 2

Shock absorber Formulae and examples of calculation 8. Rotating mass with propelling torque Formulae : W1 = m . v . 0,18 NOTE: mass evenly spread W2 = M . s R 6. Free falling mass Formulae : W1 = m . g . h W2 = m . g . s W3 = W1 + W2 W4 = W3 . C 6.1 Mass rolling or sliding on an inclined plane Formulae : W1 = m . g . h = m . vD . 0,5 W2 = m . g . sinβ . s W3 = W1 + W2 W4 = W3 . C 2 6.1a Mass with upwards propelling force W2 = ( F - m . g . sinβ ). s 6.1b Mass with downwards propelling force W3 = ( F + m . g . sinβ ). s 6.2 Mass free falling abut a pivot point Formulae: Follow calculation...

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Shock absorbers - 3

Shock absorber HPC technical assistance Fax +33 (0)4 37 490 055 Request for technical assistance with your application What material is there at the end of stroke? Rubber cushion r Shock-absorbing cylinder Brake cylinder r No shock-absorber Other r What problems do you have? Safety r Stopping too quickly Stopping too slowly r Incorrect deceleration Frequent breakages/faults r Continuous operation R - Flange behind F - Flange in front Please see preceding pages to select your intended use. Otherwise use the space below for a sketch or any other description thereof. Total weight of mass to be...

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Shock absorbers - 4

- MC25 and MC75: integrated stroke end stop and noise reducing buffer - MC150: mechanical stop required about 1mm before the shock-absorber stroke-end. - Working temperature 0 to +65°C - Materials: Body: blackened steel Rod: stainless steel Buffer: steel with elastomer insert (MC25 and MC75 only) Effective Max capacity (Nm) Return Rod Weight Per Per spring reset (kgme) cycle hour force time *Depending on availability - Dimensions in mm

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Shock absorbers - 5

RMSA shock-absorber SHI Can be adjuster in-situ to suit application - Standard part with locknut and knob - Materials: Body: blackened steel Rod: stainless steel - Adjustment. The adjustment ring is calibrated from 0 to 9. The adjustment knob is secured by a set screw which must be slackened with a 1.5mm Allen key before carrying out adjustment (do not remove completely). After installing the shock absorber, cycle the machine a few times and alter the adjustment so that optimum deceleration is achieved. For hard impact at start of stroke turn ring towards 9, for harder impact at the end...

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Shock absorbers - 6

*Depending on availability - Dimensions in mm

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Shock absorbers - 7

- Stop collar for shock absorber - Warning: for certain shock absorbers, the ase of this stop collar is essential Price each *Depending on availability - Dimensions in mm

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