The speed change on the VFD is far handier than what most lathes, and many mills have. Just turn a knob, just like volume on an old radio.
Tool chattering? Just twist the knob to see if different speeds will stop it. Without a VFD you have to stop the cut, shift the gears, start it up again and see what happens.
Static phase converters are pretty much obsolete with the availability of low cost VFDs and inverters. I honestly can't think of one benefit to using one over a VFD. I tossed the phase converters for my mill and lathe over 5 years ago.
I tossed the single phase motor on my bandsaw and replaced it with a 3 phase motor and VFD. No more changing the belt to go from cutting soft to hard materials. Instead of having just 4 speed choices I have totally variable speed control.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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