Acrylic Arrow Shims for PIU Dance Pad

thingiverse

These are the shims I used to drill the holes to the acrylic pads in the correct positions. The sizes (15mm and 6mm) refer to the hole diameter. So for the 6mm, you'll need a 6mm drill bit, and for the 15mm, a 15mm drill bit (possibly a "cup" style drill bit). ### Instructions: Print 2x of the 15mm shim. Print 1x of the 6mm shim. 1. Screw both 15mm parts together and slide them around the corner of the acrylic plate. 2. Fit the 6mm shim inside the hole in one of the sides of the 15mm shim. 3. With a 6mm drill bit, drill (has to be a 100% straight hole) all the way through the acrylic plate, so the bolt can pass through the hole 4. Remove the 6mm shim, keeping the 15mm shim in place 5. With a 15mm drill bit, drill a depth of exactly 4mm **Tips:** In step 1, the shims can be screws together with M3 screws. To ensure they remain firmly attached to the corner of the acrylic pad, I recommend using a woodworking band clamp, or any other type of clamps. This is important to ensure that both the 6mm and 15mm holes are aligned with each other. In step 3, if you can't guarantee that you're drilling perfectly vertical, use the 6mm shim in both sides, drilling just half of the way for each side, meeting in the middle. This will help better align the hole. In step 5, I used 4mm as the hole depth, as that's the exact height I needed when using my parts from https://www.thingiverse.com/thing:4437046 and a 6mm bolt with 30mm in length (30mm not including the head). This means that the bolt will screw in and have just enough clearance to raise level with the tap of the pad, and also sink down 2 millimeters, enough to allow the sensors to work. I strongly recommend that a scrap piece of acrylic is used to tune the drill depth for this, before committing to drill all the holes.