|Forum topic by jtm||posted 01-11-2014 07:58 AM||2026 views||0 times favorited||3 replies|
01-11-2014 07:58 AM
I’m having a couple of issues with my craftsman jointer:
First, I’ve started to develop chatter in my cuts. I feed the stock at a very slow rate. I also take off a tiny amount with each pass (basically as little as possible). I still get chatter marks, and the wood really tends to bounce at the end of the cut. For obvious reasons, this is much more prominent on smaller, thinner stock. Larger pieces joint more easily, but still not as well as I would expect.
Tonight I took my dial indicator and checked the blade height. All three blades are within 0.004” across the bed at any point, which seems more than sufficient for the machine.
Is it possible that the knives are too dull? I really haven’t jointed all that much stock, and far far less than I would reasonably expect before needing to sharpen the knives. I do have an extra brand new set, but I’ve heard that setting knives is an exercise that tests every woodworker’s patience, so I’d rather not do it if there is no reason to do so.
Second, I think that my infeed and outfeed tables are slightly non-coplanar. I can’t be absolutely certain yet, as I don’t own one of those $70+ fancy straightedges. But I did test it with a Home Depot grade straightedge, as well as three separate factory edges from pine, MDF, and cabinet grade BB plywood. They all show similar trends. It looks like the infeed table slopes down toward the cutterhead approximately 1/64th or so over the length of the infeed table. I know this will cause tapers with multiple passes, but I only use the jointer to true-up a board, or clean up saw marks.
I’ve done some research, and it doesn’t look like this is an adjustable feature on the Craftsman (Rigid/Grizzly). So it looks like I’ll have to take it apart and add some shims to the rails. Does anyone have any experience with this? Right now it’s not the end of the world, but one day when I have basically an entire weekend’s worth of free time, I’ll attempt to do this. (of course, this assumes that the tables really are non-coplanar, which of course I will verify when I get a nice straightedge).
Thanks in advance