So I have assembled most of the parts for making my arrow antenna. The arrow shafts are really nice, and come with aluminium threaded inserts.
I will upload some sketches of my design later in this thread.
Parts of the design requires me to drill and tap a hole for a bnc connector. I have the required tap (a 3/8 UNEF thread - 32 tpi) but this requires a drill size of 8.85mm.
Drills of this size are specialist tools, all i have is 8.8mm or 8.9mm. I don’t know much about this sort of thing and was hoping there might be some engineers who could set me straight…will the 8.9mm give too loose a fit, and will the 8.8mm lead to a broken tap?
Thanks
Edit - 8.8mm was fine (and 8.5mm would probably be too). The aluminium is quite soft, so the tap is able to sort out any additional hole thickness easily enough.