I'm building a 4th axis / lathe attachment for my X3. I'm currently designing the headstock and would like opinions on how to position the bearings.
I'll be using a spindle from a 5C spin index. To support the spindle I have purchased 2x 32209 tapered roller bearings. Grizzly uses a lighter load version of this bearing (32009) in the G0602. The G0602 puts one taper roller bearing on each end of the headstock and preloads over the entire length of the spindle.
I've also seen spindle designs that have both taper bearings face to face in the front of the headstock. Then, a standard deep groove bearings floats in the back of the headstock holding the rear of the spindle in place.
Does one design have an advantage over the other?