Hello
See if it can ± meet your needs
ac_crobra_revolution_came_faciale_noir_ref_3103172.sldprt
3 Likes
Congratulations to @m.blt for being able to design the piece.
For the anomaly he points out, it is probably due to the non-use of the "specify a direction vector" option (you have to select the axis of the part here). For me the resulting part seems to be OK with this option activated (except at one end where the spline is too short so SW does what it likes at this end).
See the PJ
NB: the AC cobra solution also seems to be OK but the final geometry seems slightly different from mine. This may be due to the tool's tailgating present with my method and non-existent with his (but the gap seems too big for this to really be the case).
cameaxiale_avec_vecteur_de_direction.sldprt
1 Like
Hi @criss
See this old com thread
https://www.lynkoa.com/forum/modélisation-volumique-3d/chemin-de-came?page=0
@+
Hello
A big thank you, for your answers, I was sick last week, now I'm better, I've started to test the solutions.
I have to do 2 cams I tried to do the same operation again but it's not easy, I just have to modify a point of the spline (if you look it is missing the last point of the spline which is not attached) and the scanning function of the volume body no longer works
I'm going to test one element at a time and I think I need your advice to be able to reproduce the function and understand how it works
Hi all
I offer you a summary of the different answers given to the question asked by @criss, about an axial cam.
The conclusions are based on my tests and need to be confirmed. Or contested...
Kind regards.
cameaxiale.docx
baticame.zip
2 Likes
Hello, m.blt
I tested the sheet metal version, the profile does not follow the trajectory well, see attachment, I put explicit annotations on the 2D drawing
I'm stuck, I'm going to try another method
3_tolerie_ac_crobra_revolution_came_faciale_noir_ref_3103172_0.slddrw
3_tolerie_ac_crobra_revolution_came_faciale_noir_ref_3103172_0.sldprt
Hello @criss,
The sheet metal version seems to me to be the simplest and most reliable given the general shape of your part.
In the attached zip, your adapted model and some explanations on the method used...
3_tolerie_ac_crobra_revolution_came_faciale_noir_ref_3103172_0_xxx.zip
Hello Michel Blt {m.blt},
Thank you, for your answers.
You have a very good level.
For the moment I'm trying to get the right dimensions on the cam
on the middle of the cam it's good but on the sides I can't get the real dimensions measured between 3D and 2D
Here is my mobile number see private message I use whatt's app
If one day you need me for a gear, maybe I could help you
Hello @.
It seems to me that this is only feasible with a linear trajectory, an infinitely small cam or like the usual cams that generate the elevations at precise rotation angles (not on the whole trajectory).
came.png
Good evening @Lynk,
I totally agree that the profile of the cam and the displacement of the center of the roller that will come into contact with it in a mechanism are two very different things... When designing a mechanism, the transition from a specification that imposes a law of motion to the geometry of a cam that will allow it to be obtained is sometimes a difficult problem, depending on the structure of the mechanism.
To get back to our sheep, the question asked at the base concerns how to generate the cam path with SolidWorks, knowing its profile curve, unrelated to the future mechanism and its roller. We are of course on the geometric definition of a room.
There may have been an ambiguity in my remarks, coming from the expression "law of lifting" that I used, instead of "curve of the cam profile". It is true that the first has a kinematic connotation, which is reminiscent of the movement of the roller and its support mechanism, while the second only concerns the geometry of the cam.
Mea culpa, my tongue forked without my knowing it.
And to be completely complete and to go in your direction, my "check" of the profile using a mechanism was done with a zero radius roller, precisely so that the cam profile and the lift law coincide exactly.
Kind regards.
1 Like
Hello @tous.
So I'm going back to my previous message, but this time in:
- Starting at a (arbitrary) pace
- Determination of the cam gait by the method @froussel described (method that I find the most logical)
- Superposition of the resulting gait on the theoretical curve
In conclusion, the result is convergent
allure_came.pdf
came.zip
Hello
Thank you, for all this information, you are really very good at drawing.
Hello
Can you help me, I have a problem on the 3D winding my create a slope of 5° to the eye on my machined part
I looked at the 3D, there is indeed a winding defect, it creates a face with a slope, see the attached files
I think Lynk's work is great but I didn't manage to modify his drawing because the elements used table etc are much too complex for me, and at first glance visually the shape of the cam does not conform to the physical model part so in my opinion I should modify it is a point table that I don't know how to master too complex for a person of average level.
So I did a swept winding on my base shape but the surface is not straight but leaning inward on the 1.31°
Can you help me as I'm way behind
1_came_faciale_noir_ref_3103172.sldprt
1_came_faciale_noir_ref_3103172.slddrw
I would try to make the D 20 axis with a slope that would compensate for the existing slope but it may not be regular
in short, help
I confirm it is not regular
when I put a slope on the axis according to compensate a little but the slope is variable on the whole surface
Hello
On this 2nd cam I tried to tilt the circle D 20 +-1° outwards to compensate for the tilting of the surface inwards
It's not perfect but for now it's my only solution because I can't modify Michel's drawing, which is too complex for me
I try with the first cam, I just tried it doesn't work
17_11_2021_camw_cm-010279_ref_3103170.sldprt
17_11_2021_camw_cm-010279_ref_3103170.sldprt
Hello@criss
can you post your parasolid part (we don't all have the same SW version)
if possible flat and a curved one to know the radius
@+
Good evening @criss ,
I persist: I have not been able to generate the profile satisfactorily with the scanned material removal function:
- if I keep the profile twist at "Minimum Torsion" in the options, the profile follows the curve, but the surface has a slope with respect to the radius perpendicular to the axis, as you noted.
- if I choose the "Direction vector" option by selecting Axis1, the surface is no longer inclined, but it does not strictly follow the profile.
Another curious element: the profile defined by the "POINT 3D" sketch is quite dented, as well as its curvature. I think it doesn't make it easy to generate the surface with the scan function; it goes better by reducing the radius of the "Boss.Extru.2" tool.
Side question: even if the surface is properly generated by SolidWorks, what will happen to the real roller that will have to roll on the cam track?
I'm going to try to define the part using the winding function.