sharp blades are diving

[levans]

Conley
That was what I was saying.
I held one of the .035 blades up and laid the back of a single edge razor blade across the outside of the blade, I didn't think to try an .045, I'd say there was a gap of .025 on either side of the blade.
I talked to the owner of the sharpening service again today ,last week He didn't think there was a problem with the set in the blades but today He admitted a "kid" may have done My order and screwed up the set.
The good news is He has a blade roller so if that's the problem it will be taken care of, if the set is off they will be resharpened and reset at no cost to Me

Larry.

[customsawyer]

I understand what he is saying. What I am saying is that the blade running around the wheels is not what causes the curve in the blade.  So turning the blade inside out and running it, will not fix the problem.

[Tom L]

could this be a pressure problem?

if a 045 blade on a lt40 is supposed to run at 2600 lbs of pressure, would a 035 blade have to run on say 2200 lbs to correctly stretch and tension a blade.
if you are over tensioning a thinner blade this would cause it to cup and not cut straight. because it is over stressing the material and causing it to bend around the rubber wheel belts

maybe less blade pressure would be the answer here, so you don't have to roll them after the cut.

[ely]

thats a pretty good guess tom, as far as i can say.

[levans]

Over tension on the blade was what came to My mind when I checked the blade yesterday, if they are able to correct the problem I will drop the tension on the band and see if that helps.

Larry   

[Solomon]

You say the new blades cut fine , and the problems started after you got them back from the sharpener.  I don't think your blades need to be rolled.  Logic dictates to me that if that were the case, The blade would have been rising or diving as you neared the  last few cuts for that blade before you changed it.   Anything is possable, however, I'm just doing the math and trying to examine the evidence.
Does this make sense to anyone else?    Does anyone disagree?  I'm all ears.  Trying to learn all I can.    Pete  Chesapeake ,Virginia.

[ladylake]

Logic would point to set or sharpness, after sawing 10 years without rolling and getting well over 10 sharpening and still cutting great at good feed rates I'll skip rolling.  I,ve had a few that tracked to far ahead which rolling might straighten out but those were less than 1-1/8" wide by then and got retired.   Steve

[drobertson]

I have had a few weird blades that came back from a well known re-sharp service, they mainly just ran rough not so much diving, The Cook's Super sharp are the ones I run now. Just a little face sharpening and they are good to go. No resetting the teeth no rolling the band. Cook's say blades should be trued back flat, but I have never in 8 years and nearly 400mbd/ft.  1-1/4 7/8  .042.

[customsawyer]

The tension doesn't have that much to do with it cause the blade guide rollers should take care of it.