Miter spline sled
Furnished content.
(from Lumberjocks.com)
I made this miter spline sled for cutting splines on boxes. I think it will work well on picture frames but have not used it in that way thus far.https://youtube.com/channel/UCSyk1Df3CdsHEBKX1KlCnjw
edit: Woodworking/auto___miter_spline_sled.wikieditish...