A jig has been defined as custom built tool to hold the work surface or tool. Generally used for repetitive work. I usually work off a solid base where the work surface is clamped to upright posts or blocks.
I help maintain historic Cordelia Lutheran Church. It was built in 1883. Sections of the siding need to be replaced because flickers have pecked holes or wood is rotten due the west exposure. Matching shiplap siding is not available but the knot-free wood is available. I explored using a table saws or router bits to make the laps but found a circular saw and this jig produced the best results. The jigs allows for edge cuts with a circular saw to make the laps.
The base for my siding jig is a 2x6x16 redwood plank that is straight. I have used it to support my jigs and construction projects for over 30 years. The uprights are 90 degree blocks of 3/4" particle board with 3/4" plywood strips attached to allow screwing to the base and clamping to the work surface.
A circular with a saw guide is used to make the cuts.
Right angle post screwed into base.
Wood clamped to posts.
Jig turned so edge cut can be made.
I use a Milescraft Model 1207 Jig to add a design and inlay to wood. The jig comes with 4 templates, a pencil guide for tracing your own pattern, a universal router base to hold the guide bushings and 2 router bits.
If you want to use your router to cut a design or add an inlay accent then the Milecraft is the tool to get. I used it right out of the box to cut my first inlay on a church door.
Bushing selection is sometimes difficult. Cut the inlay first before making the space for it.
Make some working edges out of 1/4" peg board to act as jig clamps to prevent movement and keep router flat.
Jig to cut design and inlays into wood.