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Clock accuracy is dependent on frequency, not voltage. When I use 2 phases of 3 phase power, I keep the voltage set at 120/208. If you set the output for 240, you'll have about 138 when you expect 120. Most 240v equipment works fine at 208, since manufacturers understand that it's common in...

Ha, OK thanks. I read it as if you said "It's hard on the equipment", rather than "It's hard to do."

Jim, what are the negative effects of choking the intake air? (just trying to learn, not disagreeing)

Engine speed determines frequency. Maybe a loose connection could cause enough spikes to confuse a frequency meter. Edit: Victim of missing new page, so I missed smurph's post above. I still think it's worth checking for loose connections.

When you measured 47 Hz, you also measured the engine RPM, which was 1410. Get the frequency and voltage correct before connecting a load. All three phases will always read the same frequency. Have you looked at the motor on your lathe? Even fairly large ones wired for 480V can often...