Movements of the Vertical Mill Head - 8: Help with Tramming
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Note: Tramming the head in the cross direction is more difficult than in the longitudinal direction. This is because the pivot is not at the center line of the spindle.
  1. Set the indicator to zero at the back of the table.
  2. Sweep to the front of the table.
  3. Move the head so the indicator reads about the same on the other side of zero.

Repeat steps one, two and three until indicator reads zero at both back and front. It is easier to do the longitudinal first. Remember half way to zero for longitudinal tramming (right to left). Also remember that for cross tramming (front to back) to set zero at the back and move the head past indicator zero when at the front. The indicator movement must be about twice the error. Jeffrey Donahey

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label: milling machine, head, movement, turret, rotation, ram, alignment, tramming, indicator, sweeping