When the jig is running, a fixed-blade knife sits in a clamp riding a guide rod over the grinder belt, holding the bevel grinding angle steady while the abrasive works. That is the core of this build, and it is a tidy piece of shop engineering.
The whole setup is mounted to a belt sander running an abrasive belt. The guide arm and clamp assembly is fabricated from steel and articulates, built around the Perfect Blade sharpening attachment from Housemade. The test piece is a fixed-blade knife with a textured blue and orange handle.
What stands out to me is the measuring. An orange Klein Tools 935DG digital angle gauge is zeroed on the belt, reading 0.0 degrees. With the clamp rested on one side, the gauge shows 24.2 degrees. Flipping the blade assembly tells a different story: the readings shift from 19.6 degrees down to 19.2 degrees. That gap is small in absolute terms but plenty to matter on a bevel, and it led the maker to wonder whether the clamp itself was holding the blade at differing angles.
There is both a resolution and an open thread here. Swapping in the Tormek clamp solved the angle discrepancy, which is a clean outcome. Even so, the maker asked how to properly determine the blade angle in the first place, and to my mind that question still hangs over the build. Getting repeatable numbers is one thing; knowing which number is the true bevel angle is another.