Hubert Bahr wrote: > I am talking about a spindle on the X3 Seig Mill. I am planning to > convert the current gear drive to a two range belt drive, and since the > current controller appears to use a pot to adjust the speed and a switch > to change direction I believe I could use some type of control voltage > and a relay to replace the pot and switch. Warning! The spindle speed controller on these machines is NOT isolated from the line. So, you need to provide some sort of isolation for and speed controller interface to the computer. PWM and optocouplers sounds like a good idea.
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