"D.Miller" wrote in message
...
You might be able to obtain an assembly with allowable run out by
welding an over sized shaft as accuratey as possible to the bottom of
your bowl. The end of the shaft to be welded to the bowl should be
milled square, so the bowl will have best chance of being perpendicular
to axis of the shaft. To eliminate any offset between shaft and bowl
axes, place the weldment in a 4 jaw chuck on a lathe. Adjust 4 jaw chuck
till you reduce runout at bowl edge to an acceptable level. You can now
turn the shaft down to your bearing size and the axis of the bowl should
coincide with the new shaft axis.

As an alternative you might design a coupling element to use between
bowl and shaft that can adjust offset and tilt. It could be as simple as
a long oversized collar with 8 set screws. Kind of like a Chrismas tree
stand.

I'm hoping, that at a reasonable cost, a metal spinner could make the tank
with a 3/8" shaft at the bottom. Then have an adapter made to fit the motor
shaft. Since I already ordered a motor, the adapter will have to fit
an 8mm dia. shaft. Just in case the motor doesn't work out, I'll just have to
try another. Appreciate your suggestions. I'm trying to get this thing
together as simply as possible. I was going to use an additional bearing and
flexible coupler between the tank and motor in fear the motor bearings
wouldn't support it, however I later learned that the particular motor I
ordered will take up to a 7.5 lb axial load, and a 5" dia hemi filled with
water will be well under that.

Ben

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