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 Shaft Deflection Post Reply Engineering Forum
Posted by: Vizsla_21 ®

02/10/2009, 14:26:32

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My son needs to figure out how much a shaft will deflect and i do not know how to show him. The attached shows a horizontal 25mm shaft with a cam plate attached. There will be 1000 pounds of force on the cam through the vertical shaft. The cam plate is 38mm from the bearing. Can someone provide a formula showing how to calculate the deflection?

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 : Shaft Deflection : Shaft Deflection -- Vizsla_21 Post Reply Top of thread Engineering Forum
 Posted by: Kelly Bramble ® 02/12/2009, 08:38:42 Author Profile eMail author Edit Well, you will need the following. 1) The applied compression force given by the spring at full compression. 2) Material /properties characteristics of the shaft (Modulus of Elasticity). 3) Section Modulas of the Shaft (Moment of Inertia)/(Distance from Neutral Axis to extreme fiber) simply center of shaft to outside diameter 4) Proper strength/deflection assumptions about the associated structure. Assume it is perfect? This is academia you know. Use the equations on this web page to calculate deflection --> Beam Deflection (/beam_bending/beam_bending9.htm). In engineering we call this "Stress Guessing" - humor fellow engineers - humor If this mechanism is already built take a dial indicator and mount it where you need to measure the deflection and zero out the gage without any applied spring/cam load. Then apply the full spring-cam load and observe the TIR (Total indicator Reading).

 : : Shaft Deflection : : Shaft Deflection -- Kelly Bramble Post Reply Top of thread Engineering Forum
 Posted by: Kelly Bramble ® 02/12/2009, 08:43:53 Author Profile eMail author Edit It looks like the cam is held in place by a a split ring clamp? I'm sure this works well, however I probably would have used a shear pin or shaft key way design of some sort. Other solutions are a matching flat on the shaft and cam. Just personal preference.What does this mechanism officially do anyway?