I need smooth rods and leaner bearing s and get belt  pulls or thread rodsI want to make writing machine

Smooth rods/shafts of what diameter ? Which Linear bearing LM or SC series ? Also please lets know which type of threaded rod you need, metric or ACME, so we can help. I am guessing you need GT2 belt and pulley.

Check my CNC build log to get an idea of what parts you might need @ http://www.ocfreaks.com/diy-cnc-router-mill/

Here is a video of my current 3D-Printer (V2) project using 8mm shafts and lm8uuu bearings along with aluminum extrusion and uses GT2 belts which is most common for DIY 3DPs :

Please let me know the dimensions of Rod and bearings you need . Stepper Motors,Threaded rods, copper nuts, GT2 timing belts, pulleys, linear bearings and other components of 3d printer and diy CNC are available with me for best price. Please whatsapp me on 9902071516 for pricing and more details.