I posted a detailed makeup of this project in the project section: http://lumberjocks.com/projects/71163
In short, the idea was to make a tool that can check the alignment of the miter slot to a fence as well as the blade to miter slot. I noticed some rip cuts binding recently and suspected alignment problems since I moved the saw around a bunch while reorganizing my shop. I don’t have a dial indicator that works right, so this was the fix. A scrap of MDF, a threaded insert with matching bolt, and calipers are all that was needed.
Note, if you don’t have calipers or they are too expensive to use in this manner, they aren’t really required. They work great, but any type of material that will stay put when secured and move will work. I’ve seen setups using a 12 inch ruler, scrap metal rods, and even wood. The concept is to be able to measure both ends and there are a lot of ways to do that.
For the record: The rear of my fence was slanted inwards creating the bind mid cut.
-- Jeff, South Carolina