Mobility is key for our shop, and I didn't want to fork over for a mobile base for my Grizzly G0555 when I figured I could do it myself. There were plenty of suggestions online, so I took a few and came up with one. And it *almost* works!
The general idea is that it sits on the base feet (not on the mobile base) when not in use, and then when you lower the arms, it raises the bottom of the saw up off the floor as the casters turn down. There's 2 fixed casters and 2 swivel casters.
Now for the problem. It actually works great going in ONE direction. When you first lock the swivel wheels down, they look like this.
and it rolls great. But when you want to go the opposite direction, the wheels swivel, and apparently that's enough force to cause the flex up enough that the frame drags on the floor. You can see the difference in deflection by the bend in the wooden dowel once the wheels have turned.
It's a minor change in base height, but enough to make moving the saw pretty much impossible.
So I'm thinking that the problem is that when the wheel swivels, it's just got too much leverage on the whole assembly. So I think what I'm going to do is instead of having the upper board (with the casters) be attached at the edge with the hinge, I'll attach that board in the middle. That way, the middle of the swivel casters is in the same line as the hinge joint itself. That should even out the affect of which side the wheel is on.
I'll probably also replace the wooden dowel with a small metal rod, so it won't deflect as easily and cause the casters board to come up.
All in all I like the idea, but for a first try. It needs some tweaking.