|Project by antmjr||posted 10-24-2009 11:37 AM||12637 views||17 times favorited||18 comments|
hi all, I post my first project, hope you enjoy it. This jig works on European-style table saws (it needs a sliding table). I have uploaded a little clip on Picasa that shows how it works:
Made out of black locust from my garden. Basically the piece of wood to work is held firmly in position while you move it by means of the handle. My blade saw is 3,2mm thick, while the pitch of the leading screw is 3mm: that’s very useful, because you can get the tenon slightly narrower then the mortise (the slot).
The leading screw is metric, square thread, similar to the ACME thread. To tap the nut (the nylon cylinder you see in the middle) I had to make a tap first, you can see it in the second photo, put near the handle.
As you can see, the handle has several little slots, cut on 3 disks: in the first there is only one slot (i.e. one stop every turn of handle, which means 3mm feed), the second disk has 3 slots (i.e. 3 stops/turn, 1mm feed each stop), the third 6 slots (0,5mm feed); under the handle disks (see the third photo), there are 3 pins with springs engaging the slots: this way one can control whatever move with a basic step of 0,5 mm (frankly 1mm feed would be far enough).
The type of joint you can build with this jig is extremely strong and tight. The only problem I’m experimenting is that the water based glue (vinylic) may swell the wood, slightly BUT sufficiently to prevent assembling the parts. In the 6th photo you see a joint of two 15×7.5cm black locust pieces; in this case I’m wondering if it will be the case to use resocinol or epoxy glue instead.