Thanks All, that's really useful info.
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@Carl, It was one of your posts on here which first alerted me to the potential issues with VFDs. Do you have any recommendations for a sine filter? Sadly, they look to be more expensive than the VFD itself.
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For reference, this is the VFD that I'm looking to buy:
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I'll try to take care of the motor, but if I ever find myself with a spare single phase motor, I might have a go at modifying it to fit the mill as a "just in case" spare. If I do, I'll document it and share it on here.
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Jay
Jay