Here is a simple way to cut the handles in the sides of your hives and supers. It uses a simple jig on your table saw.
First, cut two pieces of 2X4 the length of your table saws table. In the pictures you will see my pieces don't quite reach from front to back, but that's just because I used what I had on hand. If your pieces reach from front to back, you will have a much easier time with the clamping operation.
Put one piece on one side of the blade and the other piece on the other side. Next, tack or clamp a stop piece 1" back from the edge of the piece on the left side of the blade. Now clamp these two pieces together 1" away from the blade ( make sure the piece is parallel to the blade. Measure 1" from the back side of the blade and 1" from the front side of the blade ). Now your stop piece on top of the 2X4 should be exactly 2" away from the blade and look like my picture.
Next, put a mark on the stop piece exactly in the middle of the saw blade. To find the middle of the blade, look down through the table at the arbor that the blade is attached to. This is the very middle of the blade. Put your mark here.
Now take the piece you want to cut the handle in and turn it over so the handle side is down. Put a mark on the back of the piece exactly in the middle. Now put the piece up against the stop ( with the blade lowered ) and support the other side with your other piece of 2X4 on the other side of the blade. Line up the mark on the stop with the mark on the back of your piece and clamp the whole thing down with another piece accross the top of everything. It should look like my picture when you are done.
Now that you have everything clamped down so that NOTHING moves , you are ready to make your first cut!
Make sure the blade is not touching the underside of your piece and start the saw. With the saw running, raise the blade one revolution up into the piece. With the saw still running turn the handle that tips the blade on an angle and continue cranking that handle untill the blade works its way down and out of the piece. Now turn the handle back the other way untill the blade is straight up and down again. Raise the blade one more revolution and do the whole thing all over again. It took me two and one half revolutions of raising the blade untill I finally got the depth of cut I wanted which was 1/2" . This leaves 1/4" on the backside so the inside of the handle isn't paper thin. You should experiment with your saw on a piece of scrap so you don't cut all the way through, before you find out how much cut one revolution makes.
When you are all done, your handle will look like this.
As always, if you have any questions about this procedure, feel free to PM me about it.