speed controller

i have a v belt driven woodlathe that i want to change to variable
electronic speed control. i dont know if it is single or 3 phase . runs on
240 v. i know enough about electronics to follow a schematic but not enough
to know what i am looking for. i tried google but got lost in the maze. if
anyone could point me in the right direction i would be most thankfull.
thanks in advance
sarex


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