All, My Dust shoe
ITs in layers so you can use what you want or dont want.
Theory.
Based on 1/2" material I used Acrylic. and PVC for prototyping.
2 parts.
Main part: clamps to a router. you can adjust the hole size. it has a ring of holes for Leds.
also has holes underside for Magnets. and vents for router re direction.
Bottom shoe: Double grooves for stepped Brush material. groove can be cut on the center line or inside the outer lines.. Magnet holes. and mating grooves for router air re-direction. as well as pass thru holes for Led lighting.
The holes for the magnets are described as. 12mm diameter (all) 3 and 6mm thick. one side is countersunk by an additional 2mm while the other side is projecting out the additional 2mm. this creates a keyed fit.
The clamp is curved to match the vents. and requires no nut as its drilled and tapped. (you could add a nut if you wanted though).
The vents which in my case is a Milwaukee router. minimizes the tornado effect and allows for better vacuum
in my opinion. though you could elect to eliminate the area that re directs and just have a complete hole thru and thru.
The Vacuum hole is a standard hole for the larger diameter hose. resize as needed.
The Led's use at your discretion. I probably wont use them but had to give it a whirl.
So cut one Main mount part.
And cut several brush parts so you can have 1",2" and 3" brushes.
Magnets I ordered many off xbay they were dirt cheap.
Perhaps more info can bee seen here.
http://thesn1per.blogspot.com/2014/01/dust-boot-magnetic-cnc-acrylic-cambam.html-Sam