i need help

A cylinder has a slot for a cam follower. By making cut - sweep
(rectangle over helical path)

I do not know how to make the rounded ends (made by milling cutter)
that are tangent to the upper and lower cam surfaces of the slot, and
twisting the same time?

SW 2006/2005
Thank you very much everybody.
Mike.

 

Sweeping a rectangle is not the same as sweeping a cylinder (end mill).
You can think of the end mill as a rotating rectangle - the tangent
point between the cutter and the cut surface is continuously variable.
The CNC programmer only needs the centerline of the displacement, but
if you want to get a close approximation.
http://home.pct.edu/~jmather/content/DSG322/solidworks_surface_tutorials.htm

 

Seeing that you are wanting the radius of the endmill to show on your
cylindrical cam, tells me that you are looking for a fixed length of
throw, versus a continual spiral around the shank of the cam, as in the
tutorial mentioned by the previous person.If I am understanding you
correctly, you realize that the cam follower will never leave the
cylindrical cam, and allowing only for a reciprocating motion back and
forth. This means that your cylindrical cam is reliant upon a motion
that will reverse itself after every 1/2 cycle.Is this what you are
looking for? If it is...
This is one way to do it.
Create a cylinder , by drawing a circle <ex> 2 1/2 " in diameter and
extrude it out to 3 1/2" long. Offset the central plane 1 1/4" to the
right side of the cylinder,(right view).change to normal to that plane
(right)
select plane 1, and enter sketch mode. sketch two circles, diagonal to
the right side of your cylinder and connect the two circles with two
lines, and trim the circles leaving the slot that will accept your cam
follower .The length of this slot is your throw and the angle of the
slot relative to the side of the cylinder determines the time. The
radius of the end-mill is allready there,by the circles in the sketch.
Dimension the slot and exit the sketch, Insert\features\wrap, select
deboss, and enter depth of your cam-follower, <ex> 1/2", select
surface, OK, and you will have a cylindrical cam with a slot following
the helix, created by the uppermost surface of the cam (diameter), and
the surface at the bottom of the slot, (1/2" deep)
If you choose, you can e-mail me and I will send you the model.

Good luck,
G. De Angelis

 

Mike,
I have published a Solidworks file showing you how I created the
cylindrical cam on my website. Here is the link.

http://deangelistool.com/help/cam.zip

http://deangelistool.com