Timberharvester set works question

[cubdriver55]

I am fairly new to bandsaw mills after sawing with circle mills for years. I bought a Timberharvester mill and have had great results sawing very accurate lumber. The mill I have does not have set works but just a large dial with 2 pointers. They are adjusted with allen screws and have worked great till now. I was right on the money till the last cut. I had 2 and an eighth left and went to make 2 inch boards but ended up with the bottom board being 1 1/4 inches and the top 3/4. I simply left the saw where it was which just made a 1 1/4 cut and adjusted my dial from 1 in to 1 1/4 which I thought would solve the problem. I ended up making my  thicker cuts off. I cut a 6 in cant and reset the dial . It is right on the money now till the last cut and it is off by 1/4 inch. Anyone know what I am doing wrong?  Thanks  Steve

[bandmiller2]

Steve,possibly the addition of small kerf errors added up comes to roost with the last board.Thats probibly the toughest thing about sawing with a band or circular is to get the last board to come out right. Frank C.

[Brad_S.]

Even though the dial said you were at 1 inch, you weren't really....your head had probably hit bottom at 1 1/4". If you had looked, you would have seen your chains were slack and no longer holding the head. This can often be caused by a buildup of grease and sawdust on the carriage under the head frame as there is a grease zerk above it. The area to check is the  rectangular upright that encases the stainless rod that the head slides up and down on.
If that isn't the problem and no other TH owners can chime in, the guys at our sponsor CMS are pretty knowledgable about TH units.

[laffs]

if you have the drag backs and you brought the head down with the drag backs over the cant you could have bent the uprights that keep tension on the chains and that will throw things off. want to aske me how i know?
so if you bent them youl have to take the chains off from the top unbolt those metal pieces(i call them tensioners) bend them back straight. i welded 1/2 key stock down the middle of mine to give them a little more backbone. after you get them straight then you may have to make adjustments either top of chains or where they hook to the headrig to make the blade parralel with the bunks. kind of a pain. i  bent mine sawing a 20' and didnt notice a hinge that i came down on.
Brent

[cubdriver55]

Thanks everyone for the help. I do not think it is off a little all the way since it is dead on till then and the problem started all of a sudden. I don't think it is the drag backs since I have had them tied up for a while. I do think yhe cleaning or grease build up might just be what is wrong since the problem is only on the last board. I did not check this either. I will check that out and let you know.