The brass sorter in the video doesn't rely on precise holes. Those devices on the side are optical sensors (laser?) that are measuring the diameter [edit: or height] of the casing. If the diameter [edit: or height] matches the desired diameter, it operates a servo that opens a door to let the casing fall through.Charles L. Cotton wrote:I'd like to build this brass sorter, but I have no idea how to drill the precise holes that would be needed. Not counting .45ACP and .40 S&W, here are the the holes I'm worried about: .380 ACP (.374"), 9mm (.391") and 38 Super (.406").
Is it possible to drill these holes within a 0.002 - 0.005 using a drill press?
Chas.
[edit:] Reading the other responses (especially Justme's) as well as there being 3 optical sensors instead of just 1 that would be needed if they were just measuring diameter makes me agree with Justme's height assumption, not diameter. However, with enough precision on the spinning motion, the same could be done with a laser measuring the diameter. In fact, probably the best implementation would measure both diameter and height in order to sort more types of ammunition that share similar diameters but have differing heights.