Make:

• HOW TO - Make fake barf!
• HOW TO - Make a USB remote control receiver
• How-to: Cast concrete planters using packing inserts
• DIY: UV Light Box
• The van that thought out loud
• DIY Automatic ball launcher for dogs made from an old scanner

Reminds me of some experimentes I did a bunch of years back with abrasion holograms.. i didn't have a CNC, so the best i could do was lines and points.

http://amasci.com/amateur/holo1.html

that might actually be the article I read back in the day about it. Nifty stuff.

Yorgle: I was just going to post about the abrasion holos. They're incredibly easy and fun to make.

off-topic: can we not login any more? I used to be able to login here and post but it seems they've now made it more so anyone can post as long as they pass the CAPTCHA. Am I missing something?

"Hand-drawn holograms" was never in Scientific American, although it was featured in a couple of magazines over the years. I came up with the idea in the early 1990s, but it turns out another artist (Gabriel Liebermann) had discovered it in 1979! But while he kept it a secret, I made it "Open Source" in early days of the www. Zillions of kids have used it for science fairs.

I tried some engraved versions once. The glossy shine of the groove surfaces is extremely important, and it works best if you partly fill the grooves with gloss-type paint. Just give the panel one or two thin coats of black spray paint.

More info here: http://amasci.com/amateur/hand1.html

@ehrichweiss - yup, CAPTCHA now

Bill,

I'm using drag engraving. It leaves a highly polished surface in the mark.

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