60cm is a nice size log. Are you limited to width of blade guides, or, is that the limit your blade can cut, decently ??
It is difficult to tell how long 1 band can cut. When I sharpen, I take off the very little amount of metal I can, to get that really sharp blade. I NEVER take a heavy cut. It will burn the steel and ruin the temper.
Grinding a 1¼" blade down to ride on the roller teeth, so the gullets sound like a stripped gear, I never cared how long it had been used.
IF you take off the blade, as soon as it starts getting dull, you will have much cleaner cut lumber and, more blade longevity. I would guess a blade would last 10,000 bd/ft ?? Sounds like a very high guess, but, remember I suggested the Munksforsager blades ?? They DO last a very long time.
Blade lasting per day, is an entirely different thing. We have sawn all day, 6-7 hours actually cutting logs, with 1 blade. Logs were VERY clean, and were Southern Yellow Pine. Typical construction lumber.
We once tried to saw a Beach (think ocean) log, and made 1 cut per sharpen. It was loaded with worm holes (teredos), and full of fine white sand. Customer wanted it done, so, I priced it very high, and made 4 cuts. He quit, not me.
Photo below.
MOST of our sawing was sunken logs from the river. they were loaded with fine white sand, and, we had a hose to wash logs down. That's partly why I can't say how many bd/ft per 8 hours. We have sawn over 3500 bd/ft per day, loaded on a trailer, mostly natural live edge, for rustic table slabs. My son kept everything going smoothly from the mill onto the trailer, and I would keep logs ready to load, with 1 always sitting on the loader forks, ready to go up on the mill. We had a good system. Figure this to be 2½-3" thick table slabs. bd/ft adds up fast that way. We would start sawing around 7AM and have the trailer loaded and ready to head home by 3PM, same day. We were tired, but, that load would be worth $19,250.00. We could only haul 2000 bd/ft at a time, because the wood was soaking wet from the river, usually.
Moving logs from the pile to the mill, and turning logs on the mill takes a third as much time as sawing the log, usually.
We would cut the edges off the boards, 6 boards at a time, and, always 1" lumber. NEVER cut off the edge on the table slabs. DO NOT be afraid of sawing ugly logs. IF they are YOUR logs, you can make some nice money.
The last photo is Pecky Cypress in an "S" shape. Log was big but UGLY. We sold all 5 slabs for over $400.00 each. They are 37" (94cm) wide at the widest place and 2" (5.1cm) thick X 6' (183cm) long. 1 customer bough 4 and the last piece went for more than the $400.00 average.
Down here, in Costa Rica, all that wood would be "Basura", garbage, throw away.
