boards increasing in thickness

[JB Griffin]

what causes this? The board started at 3/4 and 9ft later it was 1" that cant is also tapered 7 5/8 at the front and 8" at the end. just did major overhaul on the guide rollers with new rollers from cooks and new solid shafts turn my a local machinist did a alignment and tried it out and now this. At least it cuts a whole lot smoother not wavy any more. was running a supposed resharp but not set blade that appeared to have plenty of set, have had trouble with these blades before and will try a new simmons blade as soon as it dries up a little.
just lookin for and ideas as to whats causin this so I can check it out.

Thanks

[Sheepkeeper]

Sounds like you may have a toe board sticking up a little on the far end. It's happened to me on more than one occasion. :-\

[JB Griffin]

nope towboards down and nothin under the log.

[shelbycharger400]

blade following the grain?  lots of stress?    pulling out of the clamps?

Id break out the dial caliper and check everything, you can pick them up for $40 supprises might show up.  Ive had it happen to me before, and it irritated me distroying mantles, nice wide boards ect.

[21incher]

I don't know if you have a manual mill like me, but I had that happen on my mill when the winch backed off a notch during the cut and I did not realize it until I looked at the log scale on my mill and saw it had dropped 1/4" during the cut.

[JB Griffin]

I have a hyd mill and the scale didn't move, pretty well stumped right now.

[SawyerBrown]

JB, is this on a cut right after a turn/flip, or on a second or more cut while still clamped in?

[JB Griffin]

2 cuts after a 180 flip.

[Ga Mtn Man]

Is your blade parallel to the bunks and at the same height at both ends of the mill?

If yes then:  Make another cut and stop before you get to the end shut it down and take a look at the situation.  Is the cant still on the bunks?  Has the blade pulled away from the guide rollers?  I believe your saw head is suspended from an overhead track.  Has it tilted back?

[JB Griffin]

GA will check that out been thinking that the track might be tweeked slightly. I understand that my mill has had a hard life before I got it.

[SawyerBrown]

That's where I was going too, Mtn Man.  Seems to me there's 3 possibilities: 1) the saw head isn't running parallel to the bed even without cutting, 2) if it is, then for some reason the saw head and/or blade is rising while cutting, or 3) the cant is coming unclamped and moving.  Mtn Man has the right ideas.  Good luck, JB, let us know what you find

[taw6243]

Check that your support jacks are all still tight to the ground. I had mine loosen up at the far end and cause the mill to cut thinner at one end this winter.

Tim

[Dave Shepard]

Could also be tension in the log. Is the can perfectly flat, or does it have some bow to it?

[ladylake]

Check that your support jacks are all still tight to the ground. I had mine loosen up at the far end and cause the mill to cut thinner at one end this winter.

Tim

Good post.   Steve

[Billbob]

Check that your support jacks are all still tight to the ground. I had mine loosen up at the far end and cause the mill to cut thinner at one end this winter.
Tim

That's what I was thinking as well, Tim.  It happened to me this winter also. 

Bill

[JB Griffin]

The cant is flat no bow at all. I'll check the jacks tomorrow.   Thanks guys

[drobertson]

I agree with the possibility of the jacks, but to make sure after you have them solid, do the check across each bed rail to the blade,  I would almost do a check before any adjustments are made to see how much it may be off. Just to know the limits of the frame, 

[bandmiller2]

JB, watch the band when it leaves the board, if it drops down, band is climbing. If not its a problem as described above. Frank C.

[JB Griffin]

no blade climbing either. ???

[POSTON WIDEHEAD]

They may find that Jet before we find a cause to this problem.

[drobertson]

Can you or have you checked the height at each bed rail with no log on?  It seems this would be a good check,
if it is tracking parallel with no log on then it would narrow down the options.  And if it is parallel for the length of the bed it almost seems like it would have to an issue while sawing, blades, and blade alignment.  Unless somehow the head is raising while sawing.  Weird stuff you have going on there for sure,  I'm sure you will find it,

[JB Griffin]

can and will do David I have heard that the overhead track can sag over time and use, I have sighted down the track and can't see anything, but have not measured it yet.
This mill has bout drove me crazy for the last 2-3 months.

They may find that Jet before we find a cause to this problem.

Thats funny right there David.(maybe a little truth there)

[redbeard]

Sometimes I will run saw head back and fourth with blade not engaged and let it just touch the face of can't and see what's been happening with last cut. This might help determine if you have saw head issues while moving full length mill.

[backwoods sawyer]

When I first brought my mill home it was cutting that way so I would lean heavy to the guides not being completely aligned, as bandmiller2 suggested watch for blade movement as it exits the cut. Guides can be tricky to align at times, seem like they are correct and still be off a bit, don't take being off a whole lot to make a big issue. Or it could be a dull saw with bad set like when you trim a log stop that will give you the same result.
I hit a dog tie out cable at six places in one cut, had the saw buried in a 24" wide cut and it started shaking the whole mill but kept on cutting straight as it chewed its way thru the rest of the cut.

[giant splinter]

After reading the many possibilities that might be the potential cause it seems like the problem is most likely the deck, the alignment of the deck, I could be wrong but thats my take. This is something that needs to be checked constantly while sawing on loose ground or especially on dis-simmilar ground conditions. Soft over here and hard ground on the other end needs to be kept up with and dealt with to keep the deck line tight. I am not familiar with your mill and I am sure you always get it set up properly but there are times when the jacks sink right in the middle of a job and we must stop and check things.