On the chains, I cheat. I find a sale or good price on chains and buy them.
Here's an example. 72 drive length (20" bar) 3/8" pitch, .050" gauge.
$12.95
http://www.shopcomstocklogging.com/Oregon-72LGX072G-SUPER-GUARD-CHISEL-CHAIN-38_p_66.html
I buy 10 of them which will keep me going for a long time. Once I get a pile of dull chains, I give one of the OEM boxes (so he has all the specs) as well as the pile of chains to a professional to do the sharpening. Around here, if you give them more than 5 chains at a time, the price is $3 per chain.
Here's
some of the wood I need to process this Spring. On average, they're 16" diameter and 15' long. There's 110
or so logs total.
I figure I'll be set for a few years.
Going to need to build another wood shed...
Great wood pile Zoom; going to be fun to get into that one.