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Taper - I think I have a problem?!


wrlabs
 

Hi Folks,

If I can poll the collective wisdom on this I'd appreciate it.

I'm not sure I have a problem, but I think so.

Turning down a rod I get a 0.015" difference over 5.5", please see:



I would guess that would turn into 0.030" over 11"?

If I turn a cone in the chuck and pull up the tailstock, they appear
to match up as near as I can tell.

My failed laser edge finder drew a circle around the the tailstock
center that looked centered to me.

I get this just turning a reasonably robust rod just clamped in the
chuck too (measurable difference between ends, forget what the value
is now).

I'm really lost on this, only thing I can think of (SWAG) is (horrors)
that the bed is crooked or perhaps the saddle is crooked?!???

I'm really out of ideas, am I expecting too much of the 7x12?

Thanks & take care, Vikki.

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