On 12/19/24 14:51, John Dammeyer wrote:
Ha ha. I'm still running LinuxCNC 2.8 on my mill. Kinda afraid to upgrade.
Like if it works why change?
John
Between 2.8 and 2.93 some changed in the tp have taught it new, faster
dances, it the expense of losing the older pid which had to be manually
tuned. Now it can autotune but can also destroy a servo motor doing it.
which was, in a round-about way a good thing because it made me design a
new A axis that does bot use a pid, because I used a 3 phase closed loop
stepper/servo capable of tracking X but scaled up to 500 rpm, same as
the B axis on my 6040 gantry mill, tracking the y axis as it moves about
400mm carving a two start buttress thread in hard maple to make a
woodworkers bench vise screw which I'm custom printing the half nuts for.
Those motors need no pid as its in the controller. already tuned tighter
than you can tune a servo. And if they do lose a step, they can signal
lcnc, stopping it in the next millisecond. So remove the wrench it hit,
rehome & restart, the part will be finished perfectly.
Tested till the cows come home dripping milk, has yet to happen running
gcode.
I carve a 6mm of a 12mm pitch thread going down the length of the screw,
rotate the stick 180 degrees and carve the 2nd start coming back. A far
stronger thread than anything you can buy off ebay at up to $200 a
copy. I 3d print the rest of it which with one good printer is about 2
weeks per completed, ready to bolt to your workbench vise, you make the
paddle, the movable jaw out of a Lowes 2x8. I fully intend the
woodworker will pass the workbench so equipt down to a grandchild who
wants to work wood for a living when he is done. That two weeks is why
I am currently rebuilding two printers 10x faster than OOTB. If I don't
miss roll call first. As a 90 yo diabetic whose already had his quota
of heart attacks, has a pacemaker and man made parts in my heart,
that's a real possibility. I'd post pix but they are too big for JK.
Merry Christmas everybody.
-----Original Message-----
From: andy pugh [mailto:bodge...@gmail.com]
Sent: December 19, 2024 11:42 AM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Biting the bullet
I have decided it is time to update the OS and LinuxCNC version on my
own lathe.
Apparently Wheezy was launched in 2013, and went out of support in 2018. :-
)
(It is, however, running a dev version of linuxCNC 2.8, so not _quite_
as outdated there.)
Of course such laxity would be unforgivable in any other user.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
� George Fitch, Atlanta Constitution Newspaper, 1912
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Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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