thanks Silyavski and JAZZCNC for your advices...but
i read many many threads over 2 year from cnczone and other sites and i build a prototype of cnc using wood and it work fine for first build and i build the second one (cheap) since 1 years 2000m*1000 using wood and home made component such as linear rails and screws steppers from old big printer, home made power supply and so on but the machine is Vibrating like crazy when i test X gantry (rigidity problem)finally i stopped.

the big problem is in my county is the difficulty to buy cnc component from uk,usa and china (very very costly...shipping) , and also there is no Aluminum profiles here just thin Aluminum ,wood and steel.
someone bring some standard cnc components from china (like stepper kits and china gear i mentioned above)To sell them then i think to build a big steel cnc (better than wood) using these components(there is no alternatives to choose) he bring a few types of linear rails, ball screws, R&P and electronics and the problem is "i need to choose quickly before he sell them" 3 or 4 from each type no other chance (this is why i not yet begin to construct machine bed structure and gantry)

he bring :
(ROUND RAIL) all size and nuts
(BALL SCREW) 1605,1610,2505,2510,2525 (2m length)
RACK 20*20 2m length
PINION 28 TEETH
HELICAL RACK 30*30 S45c 1.5m length
HELICAL PINION 24 TEETH
gear rack 1.25mod 1:5
power supply 48V and 60V
steppers
JK57HS82-3004-02 (NM 2.2 - 311 oZ 3A)
JK57HS112-3004 (NM 3 - 425 oZ 3A 6.8mh)
JK86HS78-5504 (NM 4.6 - 651 oZ 5.6A 3.4mh)
JK86HS115-4208 (NM 8.7- 1232 oZ 6A)
chinese spindle 2.2kw air
chinese spindle 3kw water


i have already 4 driver microstep 80V 7.8A