draw and quote a cam

[tech]

hello to all..... doing research I reached this topic;
I am a student of ing and should draw a cam of a camshaft; that design should then be provided to the miller or lather for its realization! !
I have the real tree and at first I had thought of two circumferences a smaller radius and a higher ray and join them with the bribes! I noticed however that the area that should be united by the tangents, in reality and anything but straight! Could you give me guidelines to draw and then quote the cam?
I have autocad... but I am not at all expert on the program!!

 

[cacciatorino]

I intervene to say that the cams obtained by collecting circle arches have not been done for tens of years (if the speed of the mechanism is such as to require careful control of the movement). The profile is usually studied in such a way that a polynomial-type motion law is imprinted to the forward, so that it has continuity in movement, acceleration, and speed.

 

[Tarkus]

hello to all..... doing research I reached this topic;
I am a student of ing and should draw a cam of a camshaft; that design should then be provided to the miller or lather for its realization! !
I have the real tree and at first I had thought of two circumferences a smaller radius and a higher ray and join them with the bribes! I noticed however that the area that should be united by the tangents, in reality and anything but straight! Could you give me guidelines to draw and then quote the cam?
I have autocad... but I am not at all expert on the program!!

I promised not to answer those who ask questions without having submitted in the specific section :3559:, besides everything with a question not relevant to the inventor section, but since in your first post you made a half presentation, and that I see you more fasting on the cams, I tell you my about:
To begin with, a turning machine is the right choice for a camshaft, provided it has a machine with motorized tools and a controlled rotation axis;otherwise you will need a miller.
then, if it is as I understood to recreate the profile of an existing cam of which you already know the geometry, then a sequence of starting points of the various arches referred to the center of rotation and obviously the rays of the various arches should be enough.
I attach you a file of autocad with the profile of a cam that maybe is not exactly yours, but how it should go.

probably the fact that you don't talk about inventor will bring the moderator to move this 3ad into the autocad sez; and there you will have to follow the discussion

 

[Tarkus]

I intervene to say that the cams obtained by collecting circle arches have not been done for tens of years (if the speed of the mechanism is such as to require careful control of the movement). The profile is usually studied in such a way that a polynomial-type motion law is imprinted to the forward, so that it has continuity in movement, acceleration, and speed.

I agree, but for a first-armed cam student, it's probably the case of starting with the dawn.
continuing with the studies will certainly come to the insights you described.

 

[tech]

Sorry for the partial presentation...... or almost absent!! and thank you anyway for the help you are giving me...... ! !

@tarkus:I looked at the file...... so to draw the cam I should:
consider the radius relative to every single arc!! but having the tree available, how do I take the rays in a precise way? and how should we discuss the points for which the radius should be specified?

Besides doing some research, I found a topic where you start from a basic circumference and then you specify an eccentricity equal to "e" that brings the circumference to the real profile of the cam!! I tried to delve into it but I found nothing about it..... this method is something founded or not? because knowing the eccentricity would simplify much things! !
the drawing cam is that of the attached tree! !

 

[Tarkus]

If you read in my post, I talk about a cam whose geometry is known.
If you don't know what's different.
It is, as you better specify in the last post, to reproduce a camshaft of which you have the sample and which you have to detect the geometry.
for this operation, you certainly don't have a caliber and a ruler.
the only one is to detect the geometry on a measuring bench or, if you do not have it, you can arrange on a lathe, turning the shaft at step of n degrees, and detecting on each position, with a comparison, the distance from the axis of rotation and the point of contact with the cam.. is however a solution a little 'casereccia', but in lack of better..:

 

[tech]

Okay! thanks for the various tips and explanations !!! !

 

[Mike1967]

Sorry for the partial presentation...... or almost absent!! and thank you anyway for the help you are giving me...... ! !

@tarkus:I looked at the file...... so to draw the cam I should:
consider the radius relative to every single arc!! but having the tree available, how do I take the rays in a precise way? and how should we discuss the points for which the radius should be specified?

Besides doing some research, I found a topic where you start from a basic circumference and then you specify an eccentricity equal to "e" that brings the circumference to the real profile of the cam!! I tried to delve into it but I found nothing about it..... this method is something founded or not? because knowing the eccentricity would simplify much things! !
the drawing cam is that of the attached tree! !

Would it look like a tree for a monoclindric with low rotation regimes, enduro motion?
Motozappa?
the "points" of the cam denote a milling "tranquilla with very linear valve opening.
even the angle between the cams makes me think of a very quiet engine, in fact at first glance seems an angle
slightly below 90°.
can also be of a cylindrical and therefore, considered as described before, is the lberus that
command the unloaded side..., I said all:biggrin:.
I'm not an engineer, I'm just a fan of engines. :smile:

 

[tech]

It's a cylindrical engine! ! !

 

[Mike1967]

It's a cylindrical engine! ! !

... here is why of the 90° (alternative to 180°), thanks for the info. :finger: