A common complaint about T-track extrusions is how, even if you fasten down a track using the hole spacings provided, you can still pull them up out of their groove with heavy upward force, such as when you are using hold-down clamps.
I ran into this problem once, when using a short section of T-track on my drill press table to secure small objects. My solution was to drill and countersink more holes in the track. Some T-tracks have centered grooves that make it easier to drill additional mounting points, others don’t.
Otoro’s dovetail T-track was specifically designed to prevent the pull-up that can plague common T-track installations. It features a dovetail profile and securely installs into a 14° dovetail groove, giving it a lot of resistance against strong upward forces.
You still have to use screws when installing an Otoro dovetailed T-track, but they’re more for keeping the T-track in place from sliding in the groove, rather than for holding the track down to your table.
Made from high-grade aluminum, the T-track is anodized in “Otoro pink.” They provide 6 screw holes for a 610 mm (24″) length, and 9 holes for a 914 mm (36″) length. Of course Otoro recommends that you use their own hold downs, but I measured a T-bolt from a Rockler accessory and it should fit nicely.
Cutting the dovetail slots for these T-tracks will be a little more difficult than just cutting a straight sided groove with a 3/4″ bit. Unless you can find a 14° 23 mm wide dovetail bit (I couldn’t), you would have to make at least 2 passes with a smaller 14° dovetail bit to get the correct width. One pass could create the correct angle on one side, and a second pass (at the least) would create the angle on the other side, widening the slot to length.
For installation, you’ll only be able to slide the T-track in from the side, so you need to design and plan out your project accordingly.
The biggest downside is that I can only find one distributor for these dovetail T-tracks, Dieter Schmid in Germany, with all of their prices are in Euros. I’ve converted the amounts to dollars, but they are only approximate.
They sell the T-track in 24″ and 36″ lengths for ~$11 or ~$14 respectively. Also you’ll have to pay at least $32 shipping on top of the $14 for a single 36″ T-track. After the first couple of extrusions, shipping goes to ~$41, and then goes up in smaller increments as you add many more extrusions to your order.
Buy Now (Dovetail T-track via Dieter Schmid)
Otoro also makes a dovetail miter channel extrusion. It’s made for a standard miter slot bar (3/8″ x 3/4″). Dieter Schmid notes that you have to remove the bottom T-clip to use this miter channel with Incra miter sliders.
As with the Otoro T-slots, Dieter Schmid seems to be the only distributor. They sell the miter channel in 24″ and 36″ lengths, and for a little less than the T-tracks, at a little over $7 for the 24″ track, and a little over $9 for the 36″ track. The same shipping charges apply as above.
Buy Now (Dovetail miter channel via Dieter Schmid)