Hey guys, wanna know the best method to mount the motor on arms (i mean fixing them) suing a nut and bolt or just a self drilling screw??

:banghead:Due my negligence my previous frame, which was having cracks bent and broked in test flight. Will be building my new frame tomorrow.

Any suggestions??

any one???

You can use self tapping screws, checkout the attached picture. I use them all the time for mounting motors, even the big ones.

Super awsome, thats what i have and was thinking to use them one concern wont the vibration loosen them up??

That wont be a problem if you are using them on wood or other similar dense material. Just make sure you don't over tighten them; other wise they loose their bite.

I am using them on aluminum arms will that be good??

NO
Use nut an bolt on aluminium tube

Thats what i am doing 

depend on the load of your motor ...

if its < 1 kg then you can consider zip ties they work great for me

Various methods to mount motors are discussed in the thread below, and many of them will apply to quads as well. I would recommend that further discussion be done in that same thread.

http://www.rcindia.org/tools-materials-and-building-techniques/how-to-mount-electric-motors-on-foamies/