Sad to hear that Gene.
My thoughts are with you!
Ray M.
--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573
The things we admire in men, kindness and generosity, openness, honesty,
understanding and feeling are the concomitants of failure in our system.
And those traits we detest, sharpness, greed, acquisitiveness, meanness,
egotism and self-interest are the traits of success. And while men admire
the quality of the first they love the produce of the second.
-John Steinbeck, novelist, Nobel laureate (1902-1968)
On Wed, Dec 17, 2014 at 7:20 AM, Gene Heskett ghesk...@wdtv.com wrote:
On Friday 12 December 2014 14:42:26 skullwo...@yahoo.com did opine
And Gene did reply:
Gene;
Have you tried the motor without the damper?
Not since putting a D525MW based machine in that position. This setup is
still a software driven pulser.
Seems the whole damper kludge was to make up for primitive half full
step drives being fed a pulse stream of questionable consistency.
I expect there is that too. I am running 2M542's for drivers, set at x8
stepper divisors. And I do expect to get another 5i25 put it in that
machine as I am very impressed with how it works on the lathe. Between
that, and I just rx'd a stack of 48 volt, 3,3 amp supplies that I'll turn
down to 45 volts if they'll go that low. Whatever all 5 of them will turn
down to, parallel them with .5 ohm isolation R's, into a big Sangamo cap,
and run all motors from the capacitor.
That should give the 2M542's a place to throw the switching current back
flows without causing the supplies to trip off, a major problem in an
older setup I had lashed together at one time about a decade back.
I've no idea what sort of shutdown or over current fold back these units
might do, so it remains TBD as to whether or not they can start and charge
a 73,000 uf cap. OTOH, I also have some 6300 uf'ers at 35 volts, 2 of
those in series with resistive voltage balancing would be a lot less
inrush at power up, and still ought to gobble up whatever the dancing
motors can throw at them.
On the flip side - the rattle dampers using cylinder shaped weights
needs to be loose and dry to work. Tests done with oil added proved
this causing the damper to become effectively a fly wheel and making
performance even worse then running nothing on the motor rear shaft.
I'd assume you mean by the attainable accels? Or by the attainable speeds
before stalls?
However, progress on this will be slow till warmer weather comes round
again. I need to round up the 5i25, and another motor as I caught the
power cable for the Y over the end of a board last week and ripped the
wires out of the 225oz nema 23 on it, and had to put my last only spare
425 on it.
My back after this past weekend is giving me hell I need to arrange for
some more cortisone shots before I can do a hell of a lot more.
This past weekend was a bit of a whirlwind. My oldest son took a bottle
and a kia and killed himself last Thursday, so I was up at 3:30ish Friday
morning to catch a plane to Omaha putting me in driving range of the
weekends events, so I was in Yates Center KS Saturday saw another son
get married, to a girl he brought with him to visit last fall, and I told
him then she was a keeper. So they did it on a date that will never come
around again for 1k years, 12/13/14. Then a motel for the night, getting
up the next morning heading for Central City NE, arriving after
visitation got started, no casket because he was cremated, saw that thru
and had a couple meetings with his widow Lesa, and since all the rest of
my boys (now 4) were there, we had a meeting and I came away with a
partial list of who gets what when my time is up. But then the
conversation got side tracked and we now have tentative plans to go on a
Texas pig hunt sometime next fall. Apparently as guest of the boys.
Thats the plan anyway. ;-)
Then back to my youngun's place in Nebraska City let my back rest Monday
morning, went to work with him in the afternoon, he works at a service
facility that specializes in repair and re-certification of stuff used in
the Nuclear industry, and wound up actually doing some work, teaching
school as it were. Patrick intro'd me around to the rest of the crew as
hands down the smartest person in the building. I may have been, but IMO
that also tends to make the rest of the frogs a bit wary. But I am also
pleased as punch that he thinks so. :)
FWIW, there are people on this list that fit in that category too, and you
know who you are. And, because you do know who you are, you know why I
write the above.
Patrick is learning a lot working there, and for a boy who got a bit of a
slow start as he was born deaf, and lived on a pre-digested formula for
the first 2 years, but his ears at about 5 yo started to work and now in
his mid 30's, hears at least as well as I do at 80.
I have a study course on passing the C.E.T. exam
