Well............!
A quick update for those that are interested.
The HPCL2631's won the postal race and arrived in the mail today.
I made up a little 'interface' board to mount them on with the pull ups,
caps, etc. and fitted that board this evenening.
After an initial check on the index pulse I ran my G76 program (in air)
for the M47 x 3.0 thread, that as giving me so much trouble, whilst
watching Halscope for the encoder index and I didn't see one ghost
pulse. I did see one that was missing over the 7 mins but I don't think
a missing pulse is going to give me as much trouble as ghost pulse and
anyway that could have been a software glitch.
Too late to cut metal now but I will tomorrow.
Looking good though!
Pete
On 13/10/2021 19:12, John Dammeyer wrote:
I'll agree with Andy here. I have a dual trace older digital scope and a 4
trace digital that can even decode CAN, SPI and I2C messaging. I bought a
small Digilant PC development kit version for $400 or so to get UART decoding
for a PAN-TILT system that was misbehaving. The add on module for the scope to
do that was $1200 so a no brainer. Haven't used it since we solved the serial
port issues 3 years ago.
But my 4 trace I use all the time. The 2 trace has spent time out in the shop
by the mill but was useless for determining what the issue was with the out of
spec DC servo that only lost steps in one direction and never the other. The
G-54 zero crept in one direction resulting in the center drill peck holes being
in one place and then a bit later the drill bit for those holes not lining up.
In a noisy shop environment just getting the scope to see real data as opposed
to the noise it picks up may be impossible. I saw that at a Siemen's plant in
Regensberg Germany back in the early 90's. We scoped a CAN bus and could
barely see the signal on the differential pair yet the system operated
flawlessly. Just couldn't find the right ground or whatever...
So the money spent on a scope may not be worth anything.
John
-----Original Message-----
From: andy pugh [mailto:[email protected]]
Sent: October-13-21 3:22 AM
To:[email protected]; Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Fwd: Rogue Index Pulses
On Wed, 13 Oct 2021 at 11:13, Peter Hodgson<[email protected]> wrote:
I'm watching a couple of Oscilloscopes on eBay so might take the plunge.
I am going to go against the consensus and suggest that if you don't
already have an oscilloscope, and don't know how to use one, then you
might not find it much help.
I certainly got nowhere trying to use one to track down false
triggering of limit switches. And I have owned a 'scope for decades
(though not used it more than a few times a year)
--
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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