On 05/21/2020 11:39 AM, John Dammeyer wrote:
This was a year ago but based on the latest fly cutting results I'm getting
slight ridges so either the fly cutter isn't exactly turning a perfect
horizontal arc or I need to tram again.
http://www.autoartisans.com/mill/TrammedVertical.jpg
Tramming the head-spindle to the table surface is not what
you want, especially on an older (worn) mill.
What I do is have a program that mills a circular path on a
piece of scrap. Step down a little at a time until it cuts
all the way around. Then, move to the center, and put in
the dial indicator and sweep the circle.
This allows you to tram to the actual X-Y plane of motion of
the machine, which may NOT be parallel to the surface of the
table. My 1938 Bridgeport cuts a kind of saddle shape that
moves up and down a few thousandths of an inch over about a
7" sweep. This way, I can tram the head to be as close to
perpendicular to that as possible.
Jon
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