Homebrew PCBs

Thanks!

:)

No racking is possible...fixed bridge/gantry design.
That's one of those details I really like about this
style of machine.

Air spindles...I never bothered, because of the sheer
amount of noise my compressor makes. But the Paul Jones
or the Wolfgang Engineering spindles are quiet...though
low powered..and are really intended for PCB work.

You can bolt on a Bosch Colt for milling enclosures. Pretty
tough router...:)

Several/many designs have been tested, so the way it is now
turned out to be the most practical. They could even have
true linear rails installed, but nothing really is gained
with the relatively small size of the machine.

Here's a high res picture of some ultra fine detail. The
carving in reality is only less than 1" in size.
.003" stepover IIRC....

http://www.microcarve.com/zone12/mib_large/mib2222%20005.jpg

:)
John



--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> Sweet.
> 
> I've been pondering CNC recently, and offer some thoughts...
> 
> Would it help to have two drive screws per axis, to avoid racking?  My
> router lift works that way.  Put them on opposite sides of the load for
> the Z axis.
> 
> Have you looked at the Harbor Freight 1/8" air-driven grinder, as a
> spindle?  I'm wondering if high speed air spindles would have less
> runout than, say, a dremel.
> 
> Your Y-axis has upper and lower guides, with the load cantilevered off
> the side.  Have you considered supporting the Y-axis the same as the X
> axis, with a sort of table to mount the load on?
>