balrog said:
Larry ,
Please post a pic of your jig
I'd be happy to! Here are some photos of the jig and how it's used to mortise 3/8" thick by 1 3/4" wide stock for Dominos. First, a full view photo of the jig:
[attachimg=1]
The jig is designed to allow me to place mortises on both the end and long edge of the stock. Next, a photo of the stock placement when mortising the long edge. The jig is constructed so that the stock is centered on the Domino cutter.
[attachimg=2]
Note that there are two positions on the jig for the Domino, both indicated by the brass wear strips set into the jig body. This allows me to place the stock into the jig from either end and still be able to mortise with sufficient clamping pressure. Next, a photo of how the Domino machine aligns with the stock. Someday I'll update the jig to eliminate the need to make centering marks on the stock, but for now I'm using the cast alignment triangle on the Domino with a pencil mark on the stock.
[attachimg=3]
In this photo you can sort of see how the jig places the Domino and stock so that the stock is centered on the Domino cutter. This can't be done with the Domino fence alone as it won't drop far enough to center on 3/8" thick stock.
[attachimg=4]
To mortise the end of the stock we move to the other end of the jig. Here you can see the 3/8" thick stock clamped down and ready for the mortise to be cut in the end grain.
[attachimg=5]
For this operation I added "wings" to the jig to hold the Domino machine in alignment from side to side. The end result of using the jig is to create a perfect 90-degree joint, end to long side, in 3/8" stock.
[attachimg=6]
The component being constructed is used as part of the looms that I build. The piece with the long side mortises (there are actually 2 about 10 inches apart) are always 22" long while the piece with the mortise in the end varies in length depending on the size of the loom. For my current build these pieces are 60 3/16" long.
[attachimg=7]
I hope this gives you some idea of how I built a jig to center a 5mm Domino on 3/8" stock. If you have any questions please let me know.
Larry