soil from scratch

[geogeo21]

so i have a lot of fir trees where i live. a lot with peeling bark. i see most orchid potting mixes are made out of fir bark perlite and charcoal. has anyone ever made their own from scartch? i'm wondering if i can put the fir bark in a food processor to turn it into smaller bits than add my own charcoal(from burned stumps in my yard) and perlite. i've used my pruners to cut the fir bark into small pieces but it takes forever!