What is this adapter that came in my lathe's toolbox?

22-02-12 18-39-16 6995.jpg



I'm gonna go on a limb and say the D123 center has a hardened tip.
 
xr650rRider said:
You might want to check it but the adapter on my lathe has a sweet spot, depending on where it's oriented. You can have .005" of runout in 1 place and as little as .0001' in the sweet spot.
Click to expand...

It shouldn't be like this. This tells you that not only is the adapter not concentric, the bore in the spindle isn't either.
 
a .0001" DTI barely moves on the spindle taper in multiple positions. < .0001" runout. Actually going back and reading an old post. The MT5 to MT3 adapter had < .0001" runout as well. It was a MT3 test bar inserted in the adapter that had the position sensitivity.
 
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