Beware of the cheap solder-cup connectors they are selling on amazon and
other places. They are made out of the wrong kind of plastic and even with
a temperature controlled iron and a quick hand, the pins can shift.
If a quick jab with the iron leaves a dent - throw them out.
I just threw out some of the crimp connectors from there as well.
Yes, they can work - but you can't rely on them working.
The problem is high quality connectors are not just 10% more -- more
like 10x more..
,.,.
I've used wire from bntechgo.com for constant motion - finely stranded - like
test-lead wire.. The wire they make the cheap 3D printers with is the wrong
type..
On 11/13/20 8:55 PM, Gene Heskett wrote:
On Friday 13 November 2020 20:45:39 dave engvall wrote:
For all the time spent chasing cable problems it might be nice to have
a chip on a board that would echo signals and generate error messages.
Without good diagnostics one is like the puppy chasing his tail.
Dave
While I agree, it wouldn't have found this. Only an optical inspection
found it, after discovering that it worked with the db25 just barely
plugged in. And I've 2 more breakouts ordered, but I have a feeling that
is also a waste of time and I'm going to have to build a board to buffer
and power boost the encoder signals. By the time they get here, I should
have the motor mounts made and installed. The driver works great, now I
have to convince hal to make it a good stiff servo. :)
[...]
We use AMP/TYCO connectors and 3M cable and have basically 0
problems If you plug/unplug the cable frequently, you should use
the strain reliefs or the first and last wires in the cable tend to
get broken.
Peter Wallace
Mesa Electronics
Thank you Peter. I found a coat of what might have been paint or
something similar on pins 12-13 of the bobs rear socket. Chiseled it
off and washed it out with some carb cleaner spray, its working or
was. The bob inputs suddenly acted as if they had a.1 cap to ground,
on all of them, changed the bob for a new but it didn't help.
Disconnected from the bob, the encoder has about a 2 microsecond
rise and fall times, 5 volt rail to rail swings, excellent
quadrature, but hook it up and get instant quad error. I've one more
bob yet, but changing it is an hour plus chore. But its a different
version, db25 moved left about half an inch. I'd have to dis about
12 other connectors just to take the back panel off and mill the
slot wider. Either that or remove the standoffs and mount it via
the connector ears.
Some days it don't pay to gnaw thru the straps to get up and p.
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Cheers, Gene Heskett
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Cheers, Gene Heskett
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