Since we’re talking about crosscut sleds…how many runners?
I’m about to make my third crosscut sled. First one is now a dado sled. Second one is bigger than needed most of the time, and so…here we go. Sled number three.
First two sleds both got two runners, but I found later that I had to fettle the runners a bit to keep ’em from binding. This got me to wondering about the necessity or desirability of two runners for a sled.
There are claims made that a two-runner sled is more stable and more accurate, but I’m not aware of any meaningful data to back up such statements. It seems to me that a solidly-attached single runner should be able to do the job–that is, keep the whole contraption moving in a straight, perpendicular line as one slides the sled over/through the blade. It’s also fairly obviously easier to build a sled with a single runner. Matt Kenney’s FWW article on his second-fence technique for a sled featured a design with a single runner, and it was called “super-accurate” or some such, I think. I’m inclined to think that a single runner is a good choice. But…I’ve been wrong before, including at least twice since lunch. So….
I realize that the question–Two runners or one?–might attract more heated opinion than illuminating discussion, but here it is.
Is building a sled with two runners merely a manifestation of the “If one is good, two are better” phenomenon? Or maybe, “God put two slots on table saws for a reason, and it’s so you could put two runners on your crosscut sled.” Did some Really Famous, Notable, and Unquestioned Master of Woodworking make a sled with two runners, and that set the stage for everyone else? Or…is it just a thing regarding which one does whatever one wants, and need justify it only to oneself?