NOTE: Very Important!!! Make sure the machine is turned off!
Place the Spindle Square on a known flat surface such as a surface plate or the table of the milling machine ( if it is flat and not damaged ). Turn the dials on the two indicators so that the needle on both indicators is on the "0" position.
NOTE: Make sure that the dials BOTH read "0" even if the needles do not look parallel. The dail should show both indicators are reading "0".
Place the Spindle Square into the collet of the milling machine and bring the milling machine head down to the table until both indicator needles have rotated approximately one full rotation. Now, adjust the machine as you normally would until both indicators are reading the same NUMERICAL value.
NOTE: It does not matter that the needles do not point in the same direction. Identical numerical readings, not the needle positions, are the values that determine squareness.
In the photo the needles are NOT pointing in the same direction; however both indicators do read the same at .055. This indicates that the mill is square on the X axis. The numerical value of the readings of both indicators is what is important, not the direction of the arrows.
Now, bring the spindle up, turn the SpindleSquare to the Y axis and repeat the same procedure here as you did on the X axis. When both dials read the same, the Y axis is also square. Make sure that the DIALS read the same. The direction of the needles is not important.
Congratulations—your mill is now square!
Helpful tip: Once you have squared the head of your mill on both axes, you can "sweep" the table as you would with an indicator by taking the reading from just ONE of the indicators from the Spindle Square and make minor adjustments if necessary.
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The patented Spindle Square was developed and patented by Joseph Navarro, an American machinist and tool and die maker, as a response to the demands in his own production machine shop for a more efficient and economical method of ... read more ...