hii

[amir]

hello, first i would like to thank all those who r helping in this site , secondly i would like to ask if annyone could send me some documents talking about the sensor types in cnc machines including the velocity and positon sensors aand thans alot

[Al_The_Man]

For the most part incremental quadrature encoders are used both for position and velocity, although robot manufacturers generally tend to use absolute encoders.
There should be plenty of information and manufacturers web sites if search is done for the above items. There is also some information posted here in previous posts if a forum search is done.
Al.