Equation to create a cam profile

[mg_ayyanar2000]

Ineed to create a cam profile curve,increasing from 0 deg to 90 degrees - 5 deg. then the reverses in opposite direction for some angles for the readius of 10.


Is it possible to write any equation to solve the problem?


(Now i have the short cut to sketch the curve)

 

[puppet]

hmm which type of cam ?

plz give a picture

 

[mg_ayyanar2000]

like mango shape


(i don't know how to insert .dwg files)

 

[puppet]

where u type these messages there is a picture of a floppy disk. thats the upload file button. it has to be zip or rar

 

[SRINIVASANIYER1]

Dear Ayyanar,


I believe you wish to design a plate cam. There is no definite equation to create a plate cam. The equation would depend on the type of motion required required to be given to the follower.Generally, Cycloidal profile is preferred for a cam which gives a sine acceleration to the follower. I am attaching a WF2 file. Though the equations are not defined, the curve is a look alike of regular cycloidal curve achieved thru splines. This would give you a general method to create the cam using graph.


2005-04-28_054949_cam_1.prt.rar


I would love to get my hand on giving equations to the profile.


Is there any place where I can find the same?

 

[dadiaz1]

Does anyone have an equation for a simple harmonic cam equation?


Thanks

 

[nomar116]

r = exp(constant*theta) yields a logrimithic spiral which has a constant angle of contant depending on your constant of spiral in the equation. I am designing a rock climbing cam and they often use a constant of .25. Seems like a normal cyclic cam would need the same constant angle of contact but I don't know.


This may not help at all but might be worth a shot