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Thanks for the detailed reply. I figured there was no standard, but rather up to the individual hatter. The block, angle of the blade, any wave in the brim will all effect the finish cut you get.The smart ass in me answers the tolerance depends on my patience quotient for that day. Each time I start to trim a brim I hold my breath and say a prayer. I have a red dot on my rounding jack and focus on keeping the pressure constant/even throughout the cut. If the felt is very soft I will recruit my wife to lend a third & fourth hand to hold the felt flat and stable.
The brim has to be dry and the wrinkles/puckers smoothed out. I start at 3 0'clock and I walk around the table rather than turning the hat. Still, once in a while as I pass 6 O'clock if I don't get the pressure even the jack will wander out and I will miss the origin cut and be wide by about a 1/16". It is a minor thing to repair, I have a curved piece of wood and an Xacto knife to join the cuts.
It is tougher if I am refurbing a not with a bound brim and I block up or down on a different shaped block. Especially going from a Reg Oval to a Long Oval it is a bitch to get the brim even all the way around especially getting the front/back same as side to side. There i will settle for a 1/16 variance and declare it close enough or my unintentional dimensional brim.
We used to have to work within 1/8" & cut with a hand torch because pricing didn't permit cutting more precise with a saw.