I use a pretty cheap $30 inclinometer to notch tubes on the Bridgeport.

Bridgeport is trammed but not 100% level (.2 degrees L to R or .126" over the length of the table if I figured that out correctly)

Sometimes the cuts are spot on. Sometimes they're not.

My procedure:

1. Tube in Paragon block as close to the cut mark as possible (w/out cutting through block)
2. Inclinometer on the vise. Zero it.
3. Inclinometer on the tube. Adjust angle. Push up to the edge of the tubing block to make sure it's square.
4. Tighten vise.
5. Leave inclinometer on tube during cut to make sure it doesn't slip.
6. Make cut.

Unless there's a better way of doing this (if there is, please let me know) I'm wondering if my inclinometer is just working within the margin of error and, if so, what do folks recommend?

Thanks!