Re: librecad
On Friday 07 December 2018 19:54:56 John Hasler wrote:
> Joe writes:
> > ...he's still on wheezy.
>
> I wrote:
> > That is easily fixed.
>
> Gene writes:
> > Not until an rtai patched kernel is available for the newer stuffs.
>
> Why would you run your CAD software on your machine controller?
Why not John? With 6 machines here running 32 bit wheezy, one running
jessie on an R-PI-3B, and one running armbian stretch on a arm64, all
but the arm64 actually running a machine or the card firmware updater,
the only one w/o enough iron to run cad stuff is the pi.
This machine, with its comfy chair, can run anything installed on the
other 6 machines via ssh -Y logins, and all are or can be mounted over
an sshfs facility for moving files around. Samba/cifs has turned into a
headache precisely because of all the windows crap that been
incorporated in the last years since Andrew T. got a helper.
NFS, any version is at best a chain with broken links, whereas sshfs Just
Works.
The machine that will carve the back panel is the best simulator ever for
code that will be run on it, simply by turning off all motor power, I
can run gcode on it, with the gui exported to this machine and its comfy
chair. This allows me to exercise the code, making sure it does exactly
what I had in mind, without carving up a hundred bucks worth of raw
material and putting more wear on a cutting tool.
alu is the hardest stuff to cut in terms of tool wear there is, only
partially mitigated by a mister directed fog of sealing oil directed at
the back of the cutting tool so the alu is sealed away from the air,
majorly sealing the just cut surface.
99% of the heat you get from machining alu is not the cutting tool
friction, but the burning of the alu as it forms a new layer of alu
oxide in the thousandth of a second after the passing cutting edge of
the tool has exposed the alu to the airborn oxygen. That alox layer is
the 2nd hardest substance we have, 2nd to diamond, and asking the tool
to cut thru it with every passing cutting edge is pure hell even on
silicon carbide tooling. At $10 to $50 a tool.
CAD/CAM may be able to do it faster, but they do not yield editable
gcode. This file I am working with, if exported as gcode from freecad,
would be 5 to 20 megabytes because the cad/cam programs have no clue
about the use of loops and conditionals. I am doing all this, with one
hole of unk size to cut yet, with 199 LOC. 50+ is comments, keeping
track of what I'm doing. And I can fix it with the same editor I used
to write it. geany.
Biggest problem ATM is I'm one eyed, haven't let the left eye settle long
enough after the surgery Tuesday to be able to write a prescription and
get the correct lens in the frame, so its empty on that side. Since I'm
partial to hard coated Transitions lenses (special order, takes 7 to 9
days in this neck of the woods), that will be 2 more weeks till I've got
two medium good eyes again.
Other than that, whats not to like, John?
--
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
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