20 Mar
2018
20 Mar
'18
12:19 p.m.
Hi Gene!
Am Montag, 19. März 2018 schrieb Gene Heskett:
[...]
The install is armbian jessie lite. Downloadable from the armbian site
LinuxCNC is the uspace version of 2.8-pre. Weird config, no PID's used
Works fine.
PM me, and I can send you what should be working configs IF you've
installed and wired up a pair of MPJA's 100 ppr a/b encoders to function
as hand wheels. This encoder is also available elsewhere, s/b under $25
a copy. Interface is a mesa 7i90HD, with 3 7i42TA's to protect the 3.3
volt 7i90HD from the noises. Spindle control is a 240 volt single ph
input 1.5 hp vfd, running an old (probably about 40 yo) 3 ph, 1 horse I
took off a scrapped air compressor.
But no use further cluttering this list, so PM me.
Thank you for your hint. Sorry, no mesas in my shop, but at least I have some encoders
waiting :-)
Ages ago I had a single RPi2 (the newer ones) running with linuxcnc + TDE and GPIO for
signals, just like the parallelport. Latency was not so great (~ 20000ns), but at least
the steppers turned. Last week I wanted to resurrect the project, just finding the RPi
beeing unable to boot. Well, following your hints I came to the conclusion that almost
anything is better than a RPi for CNC (oh my, never thought I would write that).
Now I've placed a T60 mainboard into a 15.4" T61p with libreboot (stock bios
gives horrible latency) + linuxcnc + TDE + NativeCAM, looks neat and has nice latency
(<2000ns).
Nik
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