Re: [CAD_CAM_EDM_DRO] Why dovetails?

What do you guys think about the Bishop Wisecarver Dual VEE bearings
for linear guides on a CNC router that will do mostly wood, a little
bit of aluminum, and maybe run a torch? these are the guides that bolt
on to whatever machine frame your using and thus are supported all the
way:

http://www.bwc.com/html/dualvee.html

> Your ways must be supported along their full length to make even a
> reasonable machine.
> The big attraction to such a terrible design, is that it's easy and
> cheap to
> get precision ground rod and round linear bearings; it's also easy to
> align
> these elements but it makes a pig's breakfast of a machine for
> anything but
> the shortest of machine travels.
> I've seen a few reasonable successes with such a design; Kearney
> Trecker
> made a universal boring mill this way, but the columns were massive
> and
> short.
> DoAll made a ginder this way too, and it was OK but not great.
> So, despite the temptation, avoid unsupported ways of any
> geometry...they're
> just not worth it.

=====
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http://map.findu.com/FIELDR



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