Use a lathe face plate with 3 adjustable supports and an indicator in the the center of the spindle, move the machine to dial in the face plate to the machine motion. Then use a bar in the spindle to swing the indicator to sweep the face plate. Same as Jon's procedure but without machining.
On Thu, May 21, 2020, 5:46 PM Jon Elson <el...@pico-systems.com> wrote: > 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 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
