So I made my first plate, 1/2" 6061 aluminum, but have run into a problem: once the plate is screwed to the table, the crossfeed locks up. To try and fix the problem, I have:
-Made the holes for the screws a little oversized for a little play or movement if needed.
-Countersunk holes were made using an endmill, so the inside is flat, allowing the screw to sit flat.
-I have 6 mounting holes, and no matter what combination I use, the table locks up.
-Loosened the gib with the small pin at the very end.
-Tried the Sherline sized t nuts, as well as some A2Z tnuts, hoping to spread the force out a little.
-The screws are not hitting the bottom of the table...10-32 screws btw.
And when I say it locks up, it's stuck...and that's with barely even tightening the screws. My last hope is to make a longer gib pin (the L shaped bar that holds the big in place) which might allow the gib to sit back a little farther. It's apparent that when the t nut are tightened, it's pushing the v slot out, causing it to bind. That's my theory at least. I haven't tapped the holes yet, as I'm waiting to see if this will work or not.
Any help is appreciated.

