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Subject: Re: [Homebrew_PCBs] CNC board drilling and routing

From: "Stefan Trethan" <stefan_trethan@...>
Date: 2006-05-09

I expect you plan on showing pictures sometime?

ST


On Tue, 09 May 2006 00:39:53 +0200, Alan King <alan@...> wrote:

> I have had it out since Christmas, but finally got around to really
>
> getting things going again in the last two weeks. Reworked the basic
>
> front end program to read Gerber, so now it'll route out the cutouts etc
>
> from board outlines from Eagle. The 2.4 of the newer Gerber format is
>
> very easy, nice having everything in the same place..
>
>
>
> The simple, meant to be temporary mount I had worked fine for
>
> drilling, but couldn't take a side load so was flexing around. Went
>
> back over to Lowes the other day looking for other boxes etc to make a
>
> better mount, and now they carry a nearly 3" deep single wide metal box,
>
> with no punch outs on the flat sides. Not only will these work for
>
> mounting the Dremel, but they are also large enough to handle a NEMA 23
>
> motor. While I did plastic boxes since it was easy to locate and drill
>
> the holes, the intent was to work out locations then make them with
>
> metal, the plastic just worked out ok enough to not worry with it much.
>
> But now there are very suitable metal ones available, time to change it
>
> over. These and a simple box setup to remount the last coupler and
>
> everything will be pretty solid. Hmm do have to redo the Z motor,
>
> mine's a custom with lead screw, not a standard motor. Still not hard
>
> or much to do..
>
>
> Melamine base plate, wood for the cut board of course, and one wood
>
> plank for the mounting plate for the tool holder. Even the plank could
>
> be done away with and make the mechanics all metal, but little point
>
> since it makes mounting the tool holder easier than straight to the
>
> rails and doesn't affect accuracy much if at all, since it's only the
>
> 3/8" thickness that's in the X,Y dimension.
>
>
> All metal mechanics machine that only takes straight cuts and drill
>
> holes to make, and still ends up being sub-$150 with motors etc. Likely
>
> sub-$100 if done right since the mechanics themselves end up $75 or so.
>
> Getting it finished up over the next couple of days since I want it to
>
> cut out my inner board cuts now.
>
>
> Much of the work is in the boxes, the rest is straight cuts and drill
>
> holes. Plus the box price drops in half if you buy a case of 20 boxes,
>
> like $25 or $30. Likely I could CNC a few sets up and mail them out
>
> with little if any added cost over just buying the 6 individual boxes,
>
> even after shipping not likely $15 or $20. Wouldn't make sense shipping
>
> the other parts though, they have flat cost and not that much work
>
> required on them, better to just buy the rest at a local Lowes.
>
>
> Could probably be brought up to doing medium machine work without too
>
> much effort since it's metal. Most of my own uses are small or light
>
> duty so not sure I'll take it to that point myself. Only thing big I
>
> want for now is a 4'x8' sheet plywood cutter, and that's a different
>
> animal..
>
>
> Alan
>