On 11/22/2016 12:41 PM, woodchucker wrote:
On 11/22/2016 10:45 AM, Brewster wrote:
On 11/21/16 9:05 AM, Brewster wrote:
On 11/20/16 6:11 PM, Peter Bennett wrote:
On Sat, 19 Nov 2016 09:51:45 -0600, Leon lcb11211@swbelldotnet
wrote:

:


Oddly, and counter to what you would think, the crown helps the blade
stay centered, I read that some where when researching BS's 10 years
ago. With my Laguna the tension does not seem to be critical and I
seldom adjust the top wheel tilt when going from a 1/2" to a 1.25"
wide
blade.


Mattias Wandel explains this:
http://woodgears.ca/bandsaw/crowned_pulleys.html



Very nice. The "stretching" from the crown makes sense, negative
feedback control loop!

-BR



My tires are flat rubber hoops, but out of curiosity, I placed a square
across the tire surface and sure 'nuf, there is a very slight crown,
maybe 10 mils at the center across 1 1/4" of width. My wheels must be
machined with an ever so slight crown (learn something every day!)
I still run narrow blades (1/2" and smaller) with the teeth hanging off
the front of the tire as recommended, never get any movement, but I'd
assume that tweaking the tracking is effectively putting a pseudo-crown
under the center of the blade.

-BR


Teeth off the front of the rubber?
How old is the saw? What brand? I wonder if the tire is worn.

Many Italian built BS's have "rubber" tires. My Laguna has rubber.



Old saws didn't have much crown and had rubber, which hardened or wore
down. Maybe your tire needs replacement.

I let my narrow blades ride in the center. I don't usually have to touch
my saw, other than set the thrust bearing and guides.