Jack, why? If it is important, and you need to measure numerous parameters of the 3ph drill, (type testing?) then you will need a decent 3 ph supply. The cheaper inverters are not quite the same as 3ph mains. If you change the motor to single phase, then it is no longer the same machine. If you want to measure torque/speed, knowing the motor type/specification, and gear/belt ratios you can calculate (with a margin of error) a number of things that you may think you need to measure.
If it is a case that the 3ph drill is wanted to be actually used in a single phase environment, and you want to see if it works, and would be useful, then as mentioned a 1 to 3 ph inverter would be useful. You can transfer it to other 3ph machines as they are acquired. Get one rated more than you need, e.g. 1kw motor, get 1.5kw inverter, because 3ph machines are cheaper, and you will want more power, you always do.
wrt wrapping a cord round the shaft to spin it with one phase connected, -don't snag the cord, and if you can't get at the motor star(neutral) point, it may not work -i.e phase to phase is 1,732 times the neutral to phase volts
If you are unsure of what you are doing, call in professional help, don't believe what anybody says here, because we have no idea of your situation.