Barrel cam design, Torsion, Rotational Speed, Displacement

[hjohannes]

Hello

I'm a student and I have project making a harvesting tool which need barrel cam

I need force to cut trunk of coconut tree (I don't know it in english, what I mean is the hard part of coconut leaf)

I'm a bit confuse here

from Robert L Norton book Cam Design and Manufacturing (which I only read a bit from web because I don't have one) it always explain about displacement, velocity and acceleration of follower. And I try to use Dynacam 10.0, it gives me very big number, like the velocity is 2million mm/s

I have made the prototype of the tool and barrel cam, it has diameter 21.5 mm, and 5 mm displacement, I don't know working speed but I'll assume 7000 RPM, and it did cut the leaf

My question is which force that I will use to cut the leaf, follower mass and its acceleration which is F=m.a

or force from the shaft which I get from shaft's torsion?



second question is how to design diameter of barrel cam or any other reference is very helping me

I have
-Torsion of shaft
-RPM of shaft
-Follower Displacement (I'm using 5 mm now, but it can be changed)
-Follower movement is translating

Thank you so much

 

[Achy47]

for your question! I can understand your confusion about the forces involved in cutting the trunk of a coconut tree. Let me try to break it down for you.

First of all, the force required to cut the trunk of a coconut tree depends on several factors such as the type of coconut tree, its size and age, and the sharpness of the cutting tool. However, in general, the force needed can range from 500 to 1000 Newtons.

Now, let's talk about the forces involved in your barrel cam design. The force that you need to consider is the force applied by the follower to the cutting tool. This force can be calculated using Newton's Second Law, which states that force (F) is equal to mass (m) multiplied by acceleration (a). So, you will need to determine the mass of your follower and its acceleration in order to calculate the force required to cut the coconut tree trunk.

In terms of designing the diameter of your barrel cam, you will need to consider the torsion of the shaft and the RPM of the shaft. This will help you determine the amount of torque required to rotate the shaft and the size of the cam needed to achieve that torque. Additionally, you will also need to consider the displacement of the follower and its movement (translating in this case) to determine the appropriate size of the cam.

I would also recommend consulting with a mechanical engineer or a cam design specialist to get more specific guidance on designing your barrel cam for this project. They can also provide you with more specific formulas and calculations to help you determine the appropriate diameter for your cam.

I hope this helps and good luck with your project!