I keep getting myself into situations where I've made a nice PCB and designed it for an enclosure and everything is smooth sailing until it comes time to make holes in a front panel (typically something that is aluminum and 1.5mm/14ga/60mil thick).
My current solution is the following (and I am not happy with it):
- Mark up the aluminum front panel with pencil or blueing and a scratch awl, indicating where the centerpoint of the holes are supposed to go.
- Make a "dimple" on the centerpoints with a spring-loaded punch
- Drill a small hole using the dimple to guide the drill bit (I am using a hand-held drill)
- Drill the correct size hole using the small hole as a guide for openings to fit LED lens's, switches, or cable-glands, etc
What happens, even in the best-case-scenarios, is that I make little errors. I have a row of LED's and one is not in alignment. Or worse, the drill snags on the panel and I end up ruining the panel. Whatever the case it's a lot of work and the results are less than satisfying.
When I look at the front panel, I am just reminded how I screwed it up!
I am looking now into punch and die tools like this (
https://www.zoro.com/roper-whitney-hole-punch-kit-13-16-ga-steel-5-kit/i/G5302044/). This particular one is hand-held and has some restrictions about how far from the edge the punch can reach. Also, it's a hand tool and it might be fine for making holes in aluminum studs (which subsequently get covered by drywall) but I don't have a feel for how good the results will be for making holes in front panels that one actually has to look at.
Arbor presses seem like they would be the ideal tool for this kind of activity, but there doesn't seem to be adaptors specifically for punch and die. Arbor presses like the panavise 502 have nice adaptors for IDC connectorization-- but nothing for hole punch (FWIW it's only a 1/4 Ton force).
Finally there's the matter of accurately marking the panel so that you know where to punch/drill or whatever. Are there good solutions for this that don't involve marking stuff and measuring with a caliper?
What techniques do you folks use for making front panels that look good? Is this stuff best shipped out to a manufacturer who can do laser cutting or CNC machining? I am talking here about prototypes (that still need to look sharp) or one-of-a-kind panels.