Mecanum wheels friction coeff- will it work?

[Ether]

Originally Posted by Alan Anderson

This can happen if you have the wheels swapped. The wheels will try to push toward or away from the center of the robot instead of spinning the robot. If you can turn it by hand without any power applied, you definitely have the wheels swapped.

Is it my imagination, or are both Figure 2 and Figure 4 in the following link incorrect:

http://www.scipub.org/fulltext/ajas/ajas351831-1835.pdf

( the link appears on AndyMark's page at
http://store.andymark.biz/am-0083.html )