Kinematic pairs are the connection between 2 links that can have relative motion between them.

But In six bar chain as shown below:

 chain with 6 links

There are five pairs for them to be a kinematic chain. But if I consider links between ((1,4),(3,4),(3,2),(2,1),(2,6),(6,5),(5,1)).I get 7 kinematic pairs. I have the resources suggesting that this chain has only 5 kinematic pairs. How?

EDIT: IT BELONGS TO:http://site.iugaza.edu.ps/mhaiba/files/2013/09/CH-5-Simple-Mechanisms.pdf.In

  • $\begingroup$ Does it fit the equation? See engineering.stackexchange.com/q/42561/10902 $\endgroup$
    – Solar Mike
    Apr 27, 2021 at 19:49
  • $\begingroup$ It fits the equation when it it has 5 pairs but actually when counting the pair, It has 7 pairs. $\endgroup$ Apr 28, 2021 at 3:25
  • $\begingroup$ Yes.But they also form kinematic pair B forms with link (2,1) . And G forms kinematic pair with link (2,6). $\endgroup$ Apr 28, 2021 at 3:51
  • $\begingroup$ What is the exact wording in your assignment. Because it seems to me that your paraphrazing of the question is tge error at hand. $\endgroup$
    – joojaa
    Apr 28, 2021 at 4:10
  • $\begingroup$ site.iugaza.edu.ps/mhaiba/files/2013/09/… page 20. It doesn't say anything but they have substituted kinematic pairs as 20 in the equation.If the file is not available see the edit in my question. $\endgroup$ Apr 28, 2021 at 4:12


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