Kurt Satter replied to Viking Aircraft Engines's discussion Alternator upper support add-on brace for single ear mounts
"How did anyone manage to drill these two holes. My rt angle attachment uses 1/4-28 threaded shank bits (Cobalt), but the hard aluminum frame material just eats the bits. Tried cutting oil, high and low speeds and have only managed to drill to a…"
Mar 15, 2020