I mean this in every aspect of the mill. Whether the bed sags under a 4500lb log, or the blade tracking system sucks, or the band wheels are untrue, etc etc. Band mills work under close tolerances. From the set in the blade, to the saw assembly to the carriage and bed assembly, it all counts. Any one major design flaw is enough to discount a machine from a potential lineup of choices.
As for using tires in place of proper band wheels, I think its a poor idea.
Coal,
I agree, but was just not sure what you were referencing specifically in this thread. Most of the logs I'm working with are 28' and 32' long, since that is the size of my house. The logs are 16"/24" tip to butt, and weigh approx 3,000-4,000 lbs. This is with the sides milled off, they are 8" thick.
So, yes I agree with what you say.
My logs have had the sides milled off them already, but in the future I would like to be able to do the same thing to do.
I used a heft mill that was built by an Amish guy, which has a 30HP diesel engine on it. This is what the results look like:
On this home I have the wall logs all milled, but I still need the rafters (6x10 doug fir is spec'd by the structural engineer), and I also need the rafters for the porches also, the t&g for the ceiling and inside walls, 2x6 t&g for the 2nd floor, etc...as you probably know there is a lot of wood in a home.
This is what drove me to start looking for a mill. Truth be told, the biggest factor for this type of work is the length that the mill can handle, 32' is pretty long for most sawmills.
The above picture was the work I completed last May/June, and I just got the timber out west, and working to get it setup soon.
Here's what I would like to be able to do, produce these type of logs, the top 2 logs were done last May/June, but the 4 underneath are 28 footers. Those top logs are a part of what you see in the top pic.
Weight is an important factor.