That version of the 6" lathe has a small spindle that is often bent by
overpowering the lathe and doing bad cuts.
First off, get rid of the 1hp motor and use a 1/4hp motor on the lathe.
Then learn to work within the limits of that motor.
Second, make up a new spindle using the faceplate and centers so that the
upset of the present spindle doesn't hurt the turning.
Third, you may want to try whacking the present spindle back towards proper
straightness although this will make the spindle a lot weaker than before
(bent metal is never as strong as unbent metal).
These are really light duty lathes compared to a 10" or larger lathe but
some people don't reallly appreciate the need for the smaller cuts and so
forth, especially with doing cast iron castings where you really have to dig
deep on the first cut to get through the surface of the part.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!