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Number of SSV's:

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Number of Solutions:

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Suspected Sources of Variations (SSV's)
Tool for pinpointing
Technical solutions
Tool chemistry
OBS
Verify correct tool metallurgy
Tool deflection
OBS
Increase the rigidity of tool
Tool deflection
OBS
Use more rigid setup
Tool deflection during boring
OBS
Reduce core shift or drill wander
Tool deflection during boring
OBS
Reduce core shift or drill wander
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