Wendelspanswick
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That's a completely different experience to what I have with my tractor and PTO generator. I fitted it with a digital volt and frequency meter and I run my 200amp inverter welder and 3 hp compressor from it and it maintains the voltage and frequency perfectly.I've experience of using a tractor to power a pto 3 phase generator and to be honest they are only really something for emergency use imho. We used one for the rare occasion we had to service a 3 phase steam washer at our workshop as we had no 3 phase mains electricity supply. The washer only had a 5.5 kw motor but once the load went on the generator it dropped the revs on the 45hp tractor thus dropping the voltage. To compensate you had to rev up the tractor, the only problem with that was once the load went off the voltage shot up to over 500v & the Hz to 60, very unfriendly to any electronic control circuits.
We had to keep someone on the tractor to continuously monitor the voltage and adjust the throttle to suit. Tractors are not designed for this purpose nor will most stationary engines unless they were used on a getset before. There is a reason pto generators are cheap - their use is limited. You would be better buying a proper genset that will supply a regulated supply unless you like fitting new electrics on your saw mill.
Another thing to consider is if your mill is suitable for running on a generator. If it has any 240v control gear it will need a neutral supply as well as the 3 phases & earth. A generator normally doesn't have a neutral so you need to think about that.