Thanks for help me guys, really.
I bought the screws today, one less thing. Jonathan I can only buy in aliexpress and eBay, I could not find the nema23 you recommended, I have looked similar but I dont know what I need to look about the inductance, could you tell me what models I shoud look.
And about the Linear Motion they offer me a similar exchangeable for u$s 622 usd instead of the hgr15 for 850 uss, what do you think? should buy it or go for hgr15?