DeWalt sent me this battery operated FlexVolt jobsite saw.
Given my previous experience with a jobsite saw, I was skeptical,
and doubly so given that this one runs off batteries. But I figured, the best way to put it to the test was to go ahead and do a project with it.
DeWalt also makes a battery powered miter saw, which perhaps explains why this saw only comes with what I would consider a "token" miter gauge. The miter gauge is very small and loose in the slot. The pivoting part is made entirely out of plastic, and the front edge isn't even parallel to the table. So I figured before I do anything else, I should make a small table saw sled for this saw, similar to this one
The slots in this saw are nominally 3/4", but wide enough that a 3/4" metal bar would have too much play sliding in it, so I made a wooden guide bar to fit very snugly, cutting it carefully on the table saw.
When switching the saw on, it often immediately turns off again. At first I thought I wasn't pushing the button long enough, but eventually I realized that when I let the red cover (that covers the start button) drop down, it taps the stop button hard enough to stop it. So that cover needs to be let down slowly. Kind of an annoying feature.
Next I cut a square piece of wood out of a piece of plywood.
This saw is a very small jobsite saw, but the fence can be moved out a full 24" (60 cm) from the blade. To accomplish this, the fence attaches to rails on either end, and a rack and pinion is used to move the two rails in unison.
Gluing down the guide bar, using some weights. The guide bar goes just a bit further from the edge of the wood than the distance from the blade to the slot in the saw.
Then scraping off the excess glue.
In the past, I made the guide bar so it could be removed again, but I have never ever had a desire to replace a guide bar on a sled, so I'm just gluing it on. If it does wear out, I could always cut it off, or make a new sled.
Grudgingly, I used the tiny little miter gauge to cut off a 2x4 for the fences for this sled. I had already planed and jointed this 2x4 to make sure it was straight, smooth and square.
When I put the start of my sled in the guide bar, I noticed it slid freely in one direction, but got stuck if I put it on backwards. Very odd.
Examining this closely with a straight edge, I realized the slot itself is curved. The middle of the slot is about 0.25 mm (about 1/128") further to the right than the ends! With a ruler pressed against the right edge of the slot, I could easily insert a folded piece of paper between the ruler and the edge of the slot!
For it to get stuck in one direction but not the other, my miter gauge must also have a similar curve in it.
I figured the best way to address this is to fix the saw's slot!
I took a file, pressed it against a block of wood to keep it vertical, and filed away at the right side of the slot near both ends, and on the left side near the middle. This widened the slot slightly, but it also made it straighter.
Now the base of the sled slid freely in both orientations. It was slightly lose though, but I adjusted for that by putting some varnish on the edges of the sled's guide bar (the varnish adds a bit of thickness).
My next step was to cut the main slot of the sled, even though I hadn't yet assembled the sled.
I added a slight chamfer to what will be the inside edge of the fence pieces with a small palm plane.
Then squaring it up with respect to the edge that I just cut.
I glued the fences to the main part of the sled, checking square-ness multiple times as I went along.
Then gluing on the smaller part on the right. I glued it on so that the slot was a bit smaller than the width of the saw blade.
After that I used some sawdust and a wooden splint to clean up any glue squeeze-out that made it into the corner.
At this point, I could call the sled done.
But on my other small sled I added this neat stop that prevents me from pushing it any further than I need to make the cut. It's a little toggle that gets caught on my outfeed table.
But I don't have an outfeed table to hook onto on this table saw.
So I had the idea of making a pin that drops out the bottom to get caught on the finger hole of the table saw insert. It works much like the latching part of a door knob (prototype mechanism at right)
At left, I'm drilling a 9/16" hole for the dowel in the bottom of the sled.
I had to cut a dowel at an angle, so I used the little miter gauge again. But to get near enough to the blade to make this cut safely, I had to extend the miter gauge's fence. I cut a bevel on the back of this fence to match the non-square angle of the miter gauge. That way the front edge of the fence is vertical.
I drilled two holes next to each other for a slot in the back of the sled, then inserted the 1/2" dowel, pre-drilled a hole and put a small #4 screw in the dowel. This screw allows the dowel to move up and down but keeps it from dropping down too far.
I hadn't anticipated this, but the sled also had a tendency to catch on the front edge of the saw (This would not have been a problem on my big table saw with a much deeper table). I filed a light bevel in the edge of the aluminium table to help the latch make it over the step on the edge of the table.
And finally, trying out the sled by cutting off a piece of maple. I have to say, the saw performs surprisingly well considering that it's battery powered. It really doesn't feel like it's battery powered.