Roller Gear Drive

[bimbo666]

Hi guys,


I have a thread for you, just see the picture below, I

 

[sanjeevkar1]

i think the evalgraph option will work


have you tries that?

 

[SRINIVASANIYER1]

This being a Globoidal CAM indexer, the velocity and start-stop acceleration-deceleration is also important. You need to define a Datum curve by equation (could be sine acceleration).


You can also try the mechanism Synthesis route, with a trace curve function. It works for Plate cams. Havent tried for Globoidal cams.

 

[bimbo666]

Hi SRINIVASANIYER1,

I have been try in the way that you

 

[puppet]

Make a Cylinder
make a curve
wrap the curve on
VSS







Edited by: puppet

 

[puppet]

hmm the above will only work if the cam cylinder is cylindrical
if its got that radius to match the driven wheel an alternate method would be needed

 

[sanjeevkar1]

why don't you guys try evalgraph. as much i know these kind of profile is easily made by evalgraph feature.

 

[SRINIVASANIYER1]

Dear Sanjeev,


Evalgraph will work to get a cut. The hitch here is the definition of the graph itself. As said earlier, the definition of the curve is extremely important and will decide the following...


Velocity (rate of change of displacement)


acceleration (rate of change of velocity)


Jerk (Rate of change of Acceleration).


Normally Cams are designed for Sine acceleration so as to get a fininte Jerk during Raise and fall. Some prefer SCCA (Sine constant Cosine Acceleration) or even polynomial curves with precision points defined.


So much for CAM design.... Now to Pablo..


----------------------------
Dear Pablo,
The following isan extract fromMechanism help files of Proe on trace curves. Unfortunately I am preoccupied else would have loved to solve this problem. I shall be delighted to hear your sucess.
----------------------------------
About Trace Curves<?:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" />
Use the Trace Curve command to:

 

[shiva_cit100]

Dear Pablo,
I am kamalakannan doing M.E, for my project i need design consideration of globoidal cam, i kindly request you to send design consideration through my mail ID([email protected]),if you any detail please mail me.