Finally got some pictures taken of the cutting process so here is the promised blog .
This is the is the cutter I use ( CMT box joint cutter set )
This is the sliding jig riding on the fence cheek ,glued and screwed together and nice and square to the fence with no play which is very imported.
The cutter installed and tilted to 45 DEG. and a insert just for this cutting operation.
Notice the pencil mark on the insert which indicates the setting of the fence for the first cut.
The indexing device I made consisting of some used lumber and two sections of cog belt ( used timing belt ) glued to the lumber with CA glue .
The section on the right is clamed to the fence rail with two C clamps and the left section is loose .
To set the distance I move the loose section on notch to the right and press it down and slide the fence against the end and lock the fence this is repeated for every cut .
I tape the work piece to the jig with masking tape pulling it tight against the jig and rubbing the tape down good .
The cutting height is important and is set to cut the groove but leave the surface intact between grooves ( a very small flat ) this is to ensure the board face is in touch with the saw table over its whole length .
I added a small cleat to the jig for the heel of the push stick to engage to and it allows me to use both hands to slide the jig through the cut and also hold the panel down to the saw table .
Now the cutting the other way with the index device reset and using the push stick .
Here is the results and they turned out very precise as you can see with the two boards clamped together which are reversed end for end and engage perfectly indicating that the indexing device is working with good precision as simple as it is and you can also see the small flats I left on the top of the pyramids.
A close up as good as my camera will take .
The board have to be nice and flat and have no twist or imperfect result will happen .
I hope this explains it well enough but if there are questions please ask .
Now its on with finish building the box for my buddy and it will be the same look as the 1882 box I posted previously if you care to look at my projects .
The pattern on last box I posted is made the same way with the difference being that I laminated three pieces with a walnut as a core and two outside layers of maple about 1/8” thick .