The original dust skirt on our ShopBot took one too many hits and frankly I wasn't a big fan of the design. This one is built using some scrap 3/8" polycarbonate, a 2" #8 bolt and nuts, and 16 3/8" x 1/4" cylindrical rare earth magnets.
There are 2 pieces to the design.
The first is the main shoe that clamps onto our spindle.
The second piece is used as the spacers as well as the dust skirt. You can create as many spacers as you need for the length of bits you use. I made 2 to start.
This system makes it extremely easy to remove the skirt for bit changes, z-zeroing, or operating without the hood altogether. It stays out of the way of the Y gantry when the z axis needs to be raised. It also eliminates the need for that silly thumbscrew that held on the factory dust hood. You could rarely get to it when you needed to and it was located in a potential pinch point.
I've included the DXF files so you can take this to any cad/cam combo you like.
Step 1: Create a Jig to Hold Your Polycarbonate Blanks
I cut rounded corners at the ends of the main shoe and skirt pieces but left the long edges at the full 5" width.
Step 2: Cut the Pieces
I've included 3 files. One contains all of the vectors combined. If you are cutting this from a larger sheet of material, you will need to do a few edits to weld the long straight edges into the skirt and main shoe pieces.
Step 3: Fit the Magnets Into the Holes
I got the magnets from K&G.
1/4" dia. x 3/8" thick
Grade N52 - Nickel Plated
Step 4: Drill a Hole for the #8 Bolt
Insert the bolt with a washer and lock washer at each end. Thread on the nut and finger tighten.
Step 5: Attach the Skirt Material to One of Your Skirt Pieces.
Step 6: Attach the Main Shoe to the Spindle
Step 7: Attach the Rest of the Pieces.
I didn't bother gluing the dust collector fitting into the shoe but you may want to seal that with some silicone adhesive.