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The poor Man's CNC, the 3D Pantograph......And a working example, shown below, on the bottom part of this article.
Once again, you don't have to be poor to build this, if you don't want to do much machining, or for any other reason, you can just build a 3D Pantograph.
Illustration
38 Remember
this? Has an error I've corrected,
see if you can find what on the next picture...
Why? What can it do for you'?
Well, imagine you can carve Wood,
or even Roofmate,
and want make a piece from that, you want to have made in Aluminum, or
Steel; Put the original and a metal block firmly set at the same distance that separates the Dremmel from the pointer. Then turn the Dremmel on, with a milling bit, and pass the pointer over the original piece's surface, the Dremmel will mill away the empty volume around the piece's contour... And leave the rest, that is, an exact replica of the original piece. So any one with no patience to learn CNC, or for any other reason, can carve a mock up of the thing he wants, and then, after a few moment's time, proudly hold a metal whatsit that is only dependent of his/hers carving skills, but will hold a lot of abuse no Wood/Stirofoam/Roofmate piece would. So what's a 3D Pantograph, anyway?
It
is
an array of drawer slides, bars on holes, or whatever, that can make a
pointer holder and a machine holder move synchronized,
on movements where they move parallel in the X, Y an Z axis, or in
plain English, they move from left to right, up and down, and to and
fro, in-sinc.
Illustration 39 What the pointer does, so does the Dremmel! Not to make light entertainment, but for the Dremmel milling bit to replicate the motions of the pointer, so as to replicate like a 2D Pantograph, but in this case, not a drawing, 3D means palpable objects! In the case shown, the left to right blue bar set on the sides of the red box holds all the white moving parts, and so they move left to right. Then the 2 vertical blue bars hold the remaining white parts, making those move left-right, up-down. Then the last, 2 horizontal blue bars move the holding piece with the inherited X and Y parallel movements of the other parts, and add the depth movement, front-back, parallel in the Z axis. So the red X original contour is being carved away on the green block! Note that if you follow this model, the first horizontal bar is the strongest bar, then the 2 vertical, then the 2 horizontal bars, as the latter only holds the holding piece, but the first holds all of the moving parts. See, it CAN be done! Tought you could'nt do it? Here's a Web Page to prove you can!
So
take a look at this Woodworking Duplictor, real neat!
http://www.copycarver.com/index.htm Like I told
you, what the point "feels", the router mills!
So go and take a look at this fine looking Site: That's what this World needs, the guy needed to solve a production problem, he went and done it, no nags! And even simpler...This is the end of the line, as simple goes! Just nail 4 wood boards, the guy doesen't even uses proper hinges, and voilá! A steel piece, a Dremmel, he happily goes on, duplicating Aircraft Proppelers, on a dime! Click on the image below, you'll see the Youtube film: 
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