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Movements of the Vertical Mill Head - 7: Tramming the Head
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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. | |||||||||||
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Note: is often the case that the simple act of tightening the head moves everything just enough to come out of alignment. It is good idea, therefore, to begin tightening the head a bit at a time as you get closer and closer to alignment. RS
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Precision alignment of the mill spindle to the machine table is called "tramming". To align the mill head precisely in the longitudinal rotational |
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The video and the image on the top of this page has an error that may not be too obvious. The angle of the indicator stem is too steep. It needs to be adjusted upward as the images on the left show. Proper adjustment of the stem as shown will give more accurate measure and will present less stress on the indicator. RS
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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.
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 |
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