Insert dial indicator into spindle using a 10mm drill bit as an adapter. Determined that the y axis was tram within .0005" and the x axis was tram within .008" over 8 inches of travel. Cut some .001" strips of stainless steel and inserted 4x at the middle of the T-slot fixture plate and 8x at the end, reducing the tram error to less than .0005". Still need to determine if the T slots run truly parallel to the x-axis or not.