I need some helpfull informations about general grinding precedures. any tip will be helpfull for me .

Regarding CENTERLESS GRINDING, You would still need to be more specific in your question.   The best General Guide was a manual put out by Cincinnati Milacron 30+ years ago, called Principles of Centerless grinding.  I believe that Krar and Oswald included most of the key points in their 1974 publication : "Grinding Technology".    

What are you wanting to grind?  Condition of part coming to the grinder?  What do you want to achieve?  How do you intend to inspect it?  Roundness? Straightness?   Cylindricity?  Surface Finish? Tolerances? Production Rates?    

What Statistical Qualification criteria do you intend to apply?  Six Sigma = 80% of tolerance? 75%?  67%?  And then there are the discussions about roundness which is actually only a 3 sigma concern since it can't be too round.

Form Grinding?  Bar Grinding?  Thru-feed?  Infeed?  End-Feed?  Camfeed-Grinding?     Other?   Shoe-Type Centerless? (Milacron referred to this as Micro-Centric.)

What are you going to do to the parts after Centerless Grinding?  Lap Grind?  Lapping?  SuperFinisher such as Supfina?

Steel Industry:   Long Bars?   
Bearing Industry:  Rollers?  Races?   Thrufeeding Tapered Rollers?
Automotive:  Input & Output Shafts? Torsion bars?  Steering shafts?  Piston Pins?  Valve Stems?   U-Joint Crosses?
Bowling Balls?  Billiard Balls?
Fuel Injector Needles?       Guitar Strings?  Fishing Rods?
Medical industry:  Hypodermic Needles?  Bone Screws?
Structural Ceramics?
Air Conditioner Compressor Shafts?
Shafts for Tape Players or cassettes?  Copiers? Cameras?
Cutting Tools?  Twist Drills?  EndMills?  Punches?
Hydraulic Parts?   Etc., etc. etc/Forged Steel Valves.

Probably the most important thing is that Centerless Grinding Machines are high production beasts.  They can produce a lot of parts very quickly.  They are frequently best used as a GAGE.  i.e. Grind at a slower rate but achieve 100% duplicate parts so as to eliminate the need for inspection or for such things as parts segregators or "Select fit" assembly.

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