Need help with axis issue ?

[micheus]

I have always used rotate then select normal , my objects would rotate on centre axis , so why now do i have to select default axis ?

You shouldn't. I must work. In that linked video at 4:15 you see I doing that.

When i rotate the wheel , select Tab to enter numeric box , rotation between each spoke is about 72 degrees via eyeball , is there
a precise way of doing this ?

You can enter some math operations in the dialog. Again, in that video I linked (from that point) you would have noticed that to place the copies in the right place I just entered 360/7 - that is precise enough.