Frame Assembly Day...
and some alignment checks.
The people who use the head tube as their alignment datum usually express seat tube twist in terms of the two readings that they get by the method shown in the previous images; but it really would be better to express it as an angular deviation.
This rig assumes that the tube is straight. I was just messing around, but I really should have the inclinometer on a beam that spans two V blocks that are a specific distance apart on the seat tube.
Frame Assembly Day...
and some alignment checks.
The people who use the head tube as their alignment datum usually express seat tube twist in terms of the two readings that they get by the method shown in the previous images; but it really would be better to express it as an angular deviation.
This rig assumes that the tube is straight. I was just messing around, but I really should have the inclinometer on a beam that spans two V blocks that are a specific distance apart on the seat tube.