# Homework Help: Theory of Machines (Mechanical Engineering) question

1. Nov 2, 2013

### kalamar20

Hello all;

I have been thinking about something for some time and could not find it through the internet so i decided to ask this to you.

In theory of machines course, there is lambda (degree of freedom of space) in the degree of freedom of mechanism formula. As you already know, lambda should be constant throughout the mechanism in order to use the formula. Here is my question;

How do you know that lambda is constant or not? I cannot figure that out and i would appreciate very much if you gave me some examples. Thank you all for your interest.

2. Nov 2, 2013

### Staff: Mentor

Can you check if the number of degrees of freedom is the same all the time?

3. Nov 2, 2013

### kalamar20

I couldnot understand you

4. Nov 2, 2013

### Staff: Mentor

How do you determine lambda?
Do this for all possible things that will happen. Is the result the same everywhere?

5. Nov 2, 2013

### kalamar20

Could you please give an example mechanism where lambda is not constant?

6. Nov 2, 2013

### Staff: Mentor

I guess some joint can get fixed or something like that. But then I would split the analysis in two parts, both with different (but constant) lambda.

7. Nov 2, 2013

### kalamar20

And then you would add their degrees of freedoms and find the degree of freedom of the whole mechanism?

8. Nov 2, 2013

### Staff: Mentor

No, why? If I can analyze both parts, it is fine.

9. Nov 3, 2013

OK, thanks.