I'm running into problems with my crosscut sled. I thought this was just an issue with wet lumber, as I bought a metric fuckton of it for a decking project for the gun range, but I am getting intermittent kickback issues on my sled, while crosscutting, without a stop block, and I'm trying to figure out why this could be the case.
I built the sled a year and a half or so ago, the bottom of it is MDF and the front and back are 3/4 plywood glued up to inch and a half. I totally understand why I would get kickback if I was using a stop block, that makes sense to me. But what I can't figure out is how I can just be crosscutting a piece to a rough length and have the blade bind on me. With the wet 2x6's, it was just bogging the blade down, and I just thought it was water (because actually the saw was spraying more water than dust on some pieces), but I pulled a bunch of old beat up scrap wood out of the shed last weekend and went to cut them down to 12" or so to fit in the trash bin, and I'm having the same problem.
My first thought is that my sled is out of alignment with the miter guides, but both guides appear to be parallel and are 10.75" apart at both ends. So I don't know how that could be the case. My second thought was that the sled somehow warped, but doesn't that seem pretty much impossible with a MDF base? Furthermore impossible with the fact that my miter guides are parallel?
I'm really confused. I'm gonna rebuild the thing tomorrow, because I had a pretty fucking close call today, but just curious if anyone had any similar experiences. Do they just wear out? I dunno.