On 01/17/2014 10:34 AM, andy pugh wrote: > My milling machine has a swinging table. This is excellent for gear > hobbing, as I can set the table to the hob helix angle. > > If I forget to put it back I can make trapezoidal boxes. DAMHIK. > > I am wondering how to be sure that the table is properly square. I guess > that the critical thing it needs to be square to is the Y slides. > This is similar to tramming. You need a known precise square. I hand scraped a set of squares, but that is pretty tedious. You lay the square on the table and align one leg with an axis by running the axis back and forth while reading the leg with a dial test indicator. When it is accurately parallel to that axis, clamp (if you can do that without moving the square) and then run the test indicator along the other axis. Adjust the swivel until the indicator doesn't move. It is something like aligning a vise to the table, except you have to do it twice.
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