Replies

1. 
   _mj_ | Feb 10, 2023 07:36am | #1

   What saw and blade combo are you using?

1. 
   [email protected] | Feb 10, 2023 12:50pm | #5

   Agreed, Not enough info to give an answer

2. 
   Jkatzowitz | Feb 10, 2023 08:32am | #2

   I've had resawing issues like that and attributed it to uneven moisture distribution in the board. I theorized that the middle of the board had a higher moisture content than the ends and the extra moisture made it tougher for the blade to cut evenly. But, of course, I could be totally wrong.

3. 
   mikeinohio | Feb 10, 2023 09:58am | #3

   Try this test:

   Resaw a similar board but without using the fence.

   If it's great, then you have a fence alignment problem.

   If it's not great, then it's something else, such as: wrong blade, dull blade, too fast feed rate, inadequate blade tension, guide misalignment, etc.......

   Mike

4. 
   gulfstar | Feb 10, 2023 12:30pm | #4

   It could also be that the board is curved towards the fence and that as you rip it pushes the blade sideways when the curve makes it track further away from the fence especially towards the center of the board, it could also be that the wood has internal stresses that make it open the kerf as you advance and pushes the board away from the guide pushing the blade sideways.

5. 
   3eagles | Feb 10, 2023 01:57pm | #6

   Saw = Powermatic 14”; fence =Kreg; blade = 3/4” Wood Slicer; alignment checks out on everything an other cuts are square and true.

6. 
   user-1118538293 | Feb 10, 2023 02:26pm | #7

   My Kreg fence flexes a bit from front to back. I get good results by clamping something to the table to prevent the fence from flexing away from the blade. Might be worth looking at if you have not already. I wouldn’t be surprised if lateral forces vary throughout the cut, any if the fence is flexing it might contribute to the problem.

7. 
   tbonetim | Feb 10, 2023 02:26pm | #8

   Has the reference face (the one against the fence) of your stock been jointed or handplaned true before sending through the bandsaw? I wonder if there might be a slight bow in your board.

1. 
   3eagles | Feb 10, 2023 04:09pm | #9

   4 square and dead flat

1. 
   gulfstar | Feb 10, 2023 05:39pm | #11

   If everything is straight and square, that leaves only the operator . Could it be that the feed rate increases after you start and decreases towards the end of the cut ?

8. 
   jake_w | Feb 10, 2023 05:39pm | #10

   Wavy can have a couple of meanings. I occasionally get a waviness across the width of a board when resawing with a similar setup and the same blade. It tends to be an oscillation about the width (3/4”) of the blade with an amplitude of the blade thickness.I don’t know why this occurs, but a fresh blade sometimes fixes it and sometimes I just slow down the feed rate. I suspect it is from sawdust loading in the teeth when the blade has asymmetric wear, but I don’t really know.

9. 
   cl810 | Feb 11, 2023 12:11pm | #12

   3eagles, have you tried slowing the feed rate?

10. 
    derekcohen | Feb 12, 2023 04:10am | #13

    It is quite likely that the wood has internal tensions being released. This widens the kerf and pushed the board away from the fence. This causes the cut to move back-and-forth.

    A better fence will help here - not higher, but shorter ...

    http://www.inthewoodshop.com/Powered%20Tools%20and%20Machinery/ResawingOnTheBandsaw.html

    Regards from Perth

    Derek

1. 
   [email protected] | Feb 12, 2023 02:34pm | #14

   While a short fence that terminates at or just beyond the blade, or using a pivot point can eliminate one problem. You first need to know if indeed that is the problem.
   If internal stresses are releasing, pushing the wood to the side when cutting, you should notice a gap open up between the wood and the fence during the cut, at the point where you get "wavy" saw marks.

11. 
    mattk41 | Feb 16, 2023 04:34pm | #15

    I would ask if you are putting any pressure on the face of the board --the face away from the fence, maybe as you are trying to keep it tight to the fence? If so, and that pressure is not entirely in front of the cut, you be binding the blade just enough to alter its tracking/smooth running. Even without hand or push pad pressure, if the kerf is closing at all your quality of cut will suffer.

12. 
    derekcohen | Feb 16, 2023 06:49pm | #16

    One other common reason for a wavy cut is a dull blade. What happens is that, perhaps unconsciously, the user increases pushing force. This loads the teeth too quickly, and the extra sawdust pushes the blade away inside the kerf. Solution: sharp blade, slower cutting.

    Regards from Perth

    Derek