To drill holes in the drill press, to make dowel joints, we can use the depth stop that the drill press usually have. But the drill bit depth stop of my drill press was always very difficult to adjust accurately, and sometimes I even preferred to adjust the height of the metallic table of the drill press than adjusting the depth stop. That’s why I may find it useful to make a depth stop for the drill bit.
DIY depth stop collar for drilling holes for dowel joints
One of the possibilities we have to drill the holes for the pegs, to the depth we need on each side of the joint, is to use a drill bit depth stop, one of those metal ones that we can buy to put around the drill bit at the necessary height.
I have two different models: a ring type collar that “stays” in position by tightening a screw against the drill bit, which is really difficult to position well and has a tendency to loosen and move; and another two-pieces model that closes tightly around the drill bit by tightening a screw and its nut. The second one usually stays firm but always somewhat inclined and I don’t find it very easy to adjust its position either.
Clamp-type depth stops are also very useful for drilling holes to the desired depth when we use a wood drilling jig.
Many of you probably prefer to use an adhesive tape placed around the wood drill bits that we use in the drill, although it is a method that I am not very convinced about, since I always end up drilling too much (a carpentry trick with adhesive tape is to leave a kind of flag on one side, so that we know that we have reached the depth that we want when the tape sweeps away the chips that remain around the hole).
Lately, the drill bit depth stop I used most often was the two-pieces depth stop, which stays firmly in position. But on a recent project it turned out that that depth stop was too wide to drill in the position I needed to drill. Then I remembered a method that I saw Matthias Wandel was using in one project. He uses a wooden sleeve as a makeshift depth stop for the drill bit during the fabrication of a table, using dowels and a tenoning jig.
So I’m going to take advantage of the fact that I have the drill press table upright (at 90 degrees to its normal position).
And I also have the wood pusher that I use on the table saw, which I can hang on the side of the metallic drill press table. When I clamp it there it stays vertical and serves as a jig for drilling. This way I have a perfectly vertical corner against witch I can put the workpiece, for example a wooden rod.
Now I can put the wooden rod in the drill press vertical table, I hold it with a pair of spring clamps and drill it little by little, in stages, stopping the drill and raising the rod from time to time as the drill press chuck was bumping against the wooden jig.
Once I have the wood rod drilled, and without taking away the drill bit, I measure the length of rod I will need to drill the dowel holes to the correct depth. In my case I want to drill 1.5 centimeter deep dowel holes. The drill bit protrudes 6’5cm, so I have to cut a piece of 5cm long wooden rod.
Now all I have to do is put the piece of hollow wooden rod as a sleeve around the drill bit, and I slide it until it makes contact with the drill press chuck. This way it serves as a depth stop and I can drill all the dowel holes being sure that they will be perfect every time.
I thought I would need to cut this wood tube or make a new one every time I put the drill bit in the drill press chuck, but this depth stop fits snugly around the wood drill bit without moving, so I just have to put it in the position needed for the dowels I use. Then, for all projects where necessary, I can place the drill bit in the drill press chuck being careful not to move the depth stop and so that the DIY depth stop is in contact with the drill press chuck: And like this I can drill the perfect holes for dowel joints.