[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

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 

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>

Reply to: