English to Portuguese Tech/Engineering Engineering: Industrial Perfuratriz- Mineração

The height difference between the units is one-half of the T.I.R.
Place shims at all driver support points equal to one-half total indicator runout.

When these two circles coincide (zero runout on the indicator) the shafts will be in alignment in the plane being measured.
In other words, it is possible by this method to accurately align shafts in spite of coupling surfaces that are not running true to each other.