At our guild's spring "by-member, for-member" mini-workshop day, I shared my method of warping the loom "back-to-front". I was asked to share my photo sequence, and since my posts on sectional warping seem to get a fair number of views, I thought I'd put these on this blog as well. If I'm going to make a mixed warp, I will sometimes warp front-to-back, especially if I want to randomly mix the warp ends in the reed as I go. But most of the time I like to warp back-to-front. It just seems to me like I'm "messing" less with the warp so it goes on the beam more cleanly.
If on your loom you (a) sley the reed, then (b) thread the heddles, then (c) wind your warp onto the warp beam, you are warping "front-to-back". Back-to-front warping basically reverses that process: wind, then thread, then sley. You need a raddle for back-to-front. The raddle is like a really coarse comb that spreads the warp out gently as you wind it onto the beam. (There is a way to pre-sley a reed to act as a raddle, but I use a raddle.)