I noticed that. Looks like video was shot first, then overdubbed and some setup details were missing - like how they hoped to maintain a 1/4" minimum bridge between those fingerholes all the way down as they drilled to near convergence [assuming they started with 1/4" separation]. There may be markings as manufactured, but I can't see them. If his jig needed markings added... I would engrave a vernier scale for that bottom half moon part of frame using a digital level for initial calibration, mark it in degrees, and keep a trig chart for corresponding fractional pitches handy. That takes care of x oriented pitches. I'd have to have this jig in hand to figure out where best to put markings to deal with y oriented pitches. Both x and y axis calibrations have to be referenced to the quill shaft, and not the table to get it right - a bubble level will lead you astray as it assumes all is square to start with.
You may not have noticed, but the finger holes were laterally pitched away from each other, so that they do not meet at the bottom. the Ring finger was pitched at 0.625" and the middle -0.125". This makes the holes more or less parallel to each other (although standard rule of thumb is to do 3/8th" away from centre for both fingers, unless the bowler has specific pitching requirements).
@@alsheps300 3/8 away laterally both directions equals 3/4 pitched away total so you figure 5/8 and 1/8 still equals 3/4 total pitch away from one another just not the same from center line that's all. Those pitches will work without issues as long as a1/4 bridge is in effect
Why the rotation part is done all manually and without a readout?
I noticed that. Looks like video was shot first, then overdubbed and some setup details were missing - like how they hoped to maintain a 1/4" minimum bridge between those fingerholes all the way down as they drilled to near convergence [assuming they started with 1/4" separation]. There may be markings as manufactured, but I can't see them. If his jig needed markings added... I would engrave a vernier scale for that bottom half moon part of frame using a digital level for initial calibration, mark it in degrees, and keep a trig chart for corresponding fractional pitches handy. That takes care of x oriented pitches. I'd have to have this jig in hand to figure out where best to put markings to deal with y oriented pitches. Both x and y axis calibrations have to be referenced to the quill shaft, and not the table to get it right - a bubble level will lead you astray as it assumes all is square to start with.
You may not have noticed, but the finger holes were laterally pitched away from each other, so that they do not meet at the bottom. the Ring finger was pitched at 0.625" and the middle -0.125". This makes the holes more or less parallel to each other (although standard rule of thumb is to do 3/8th" away from centre for both fingers, unless the bowler has specific pitching requirements).
@@alsheps300 3/8 away laterally both directions equals 3/4 pitched away total so you figure 5/8 and 1/8 still equals 3/4 total pitch away from one another just not the same from center line that's all. Those pitches will work without issues as long as a1/4 bridge is in effect