I'm really stoked on building some bike frames right now, so I'm using my brief downtime between other projects to build a couple.
Preparing to notch the seatstays. I made a new mitering fixture that allows me to notch both stays simultaneously, which may not sound like much of an advantage, but believe me, it results in a much more accurate cut that doesn't look all cattywampus when it's finished.
Above: Using a center finder to eyeball the center of where I want the cut to be.
Another really nice thing about this new stay mitering fixture is that it allows me to notch both ends of the stays without removing them from the fixture, which makes it so much easier to get everything lined up in the same plane. This frame is already going so much better than my last build, and I haven't even started welding it yet.
Fixturing the chainstays in the jig to cut the bottom bracket shell notch and the dropout slots. I adapted the design of this fixture from a guy on youtube who has a channel called "Pithy Bikes" where he has a video series of him building his first bike frame.
Test-fitting the right-side rear dropout in the slots that I cut into the stays. It fits SO MUCH nicer than the last frame I built, where I did a lot of this fitting work by hand with a file. The dropout is a Paragon Machine Works 12mm thru-axle dropout with a flat-mount disc brake interface on the left side.