Hi
I believe that the greatest hurdle in constructing a small CNC machine is
the cost of the linear slides, and I've been trying to think of a way to
alleviate this, and come up with a 'Pivot Mill'. While this is robotic in
configuration, it is for all intensive purposes intended to supplant a
conventional 3 axis machine. (X,Y,Z) Bearings are relatively cheap, and
construction of the mechanics fairly simple.
I have drawn and uploaded a concept picture here, of what I have in mind.
http://www.fotothing.com/CAONgallery/photo/9e62959f5230b6745b40b5285739b62c/
There are still three axis, but they are mathematical functions of each
other, essentially transparent to the user, and where Z is the most complex
interaction. Also notice that the tool will stay vertical during motion due
to the dual strut. The servo's are not shown, and would typically introduce
a further non-linear relationship since they would act indirectly, or at an
angle .
To control something like this, from what I've read here, sounds like a task
for EMC. So, how difficult would it be to implement this inter-relation
between the axis?
As far as the user is concerned, the machine must still execute linear moves
with normal G-code, as in G1 X200.
So the machine has ROTARY AXIS, but executes LINEAR MOTION.
A JOG in the Z axis will cause all three joints to move, but the tool will
only move vertically
Of course, there are always rigidity issues, but it's easy to beef up a
pivot arm, and this is only intended to be of the calibre of 'dremel' type,
benchtop, CNC machines.
There are other appealing factors like the inherent extended reach, for tool
changing, and if the machine were placed centrally on a table, it could
serve four work areas, as quadrants. (assuming here a 360deg. central
column)
So, is this worth pursuing? Is the functionality required already a sub-set
of EMC, or is it a huge re-work?
Regards
Roland Jollivet
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