Depends on what you mean my "interfere". Remember, on a mill like this the head can be positioned via the ram, so you effectively have two Y-axis travels: the head position and the XY table position. I just took a few photos of my vise setup, and I think these will explain the mounting. If you mount the Kurt in the center T-slot, it hangs over the back just about the same distance as is taken up by the DRO encoder/scale. So in this position the Y-travel is not restricted. If you mount it in the rear-most T-slot, then you will loose about 2-inches of Y travel. To maximize rigidity, I like to keep the fixed jaw close to the back of the XY table and the ram pulled in.
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Hope this helps.
