Re: Boring Hex Jaws, 3 jaw chuck

On 20 Dec 2006 03:16:11 GMT, D Murphy <spamto154@xxxxxxxxxxx>
wrote:
<snip>
I don't know if
you've thought it far enough through but since you are using the C-axis
the feed rate needs to be in degrees per minute. So every line of code
will have a different feed rate.
===============
Given that the old back-off/relief attachments worked with a
constant spindle speed, I don't understand why the C/Z rotation
speed would need to vary.

While this may make our money players "barf," but what I envision
is a program that varies X and C to machine a polygon. Because
the way I have the program written, a "point" of the polygon is
always at degree zero, thus you can make a Z move, and repeat the
cycle. Given the depth of the total cut, several passes will be
necessary, so most likely there will be nested subroutines, with
changing tool offsets to get reasonable max thickness chip, [.005
inch?] change in x plunge, and width of cut [z axis]. If desired
a Z move could be included to "spiral" the cutter along the
Z-axis, if the controller will allow a simultaneous C, X and Z
move

The program only generates a line number [starting at 10000
incrementing by 1], C value and X value for C = zero to C = 360
to generate a polygon. This is a sub and would need main program
to establish modal options such as units, Z step, feed rates,
speeds and housekeeping [spindle/coolant on/of].

Currently the program only does polygons, but could be easily
modified to generate actual back-off/relieving action for form
(gear) cutters, reamers, taps, etc. This may be important for
maintenance work where parts, and/or the tools to make them are
no longer commercially available.

I anyone wants to try this, and needs the output [file] in a
different format such as a different line number format,
more/fewer decimal places, leading zeros, pre/post fix, etc. drop
me an email or ask on list. I don't have access to a cnc machine
anymore to see how this will work in practice.

I use the Console Compiler from PowerBasic [4.0] and have been
very happy with it as it generates console/text-based programs
that will run on even the latest versions of windoz. The exe
files are tiny compared to windoz based applications and
compile/run *M*U*C*H* quicker. The IDE fits the way I work.

Enjoy



Unka' George [George McDuffee]
................................
On Theory: Delight at having understood
a very abstract and obscure system
leads most people to believe
in the truth of what it demonstrates.

G. C. Lichtenberg (1742-99),
German physicist, philosopher.
Aphorisms "Notebook J," aph. 77
(written 1765-99; tr. by R. J. Hollingdale, 1990).
.