today I went to the hardware stores that has the machine. However, I cant get it threaded because i bought GI pipe instead of iron pipe.
They said if GI pipe, their die will blunt fast and the pipe will get dented very easily.

But Galvanized Iron (GI) pipe is lighter and cheaper. no wonder i thought it was cheap like 12 ft - RM 17.
Iron pipe is around RM 50+ for 20ft.

this is something i was wanting to build