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BR549

• 6,965
« Reply #40 on: May 03, 2011, 05:46:25 PM »
OK what do you mean " common is 4.96 for z-  and 2.85 for z+"

(;-) TP

RICH

• 7,427
« Reply #41 on: May 03, 2011, 06:03:14 PM »
Quote
Where would I be getting the noise from?  The plasma's breaker is still shut off.

If you have a battery operated portable radio, just tune it to any am or fm frequency and scan / sniff  the area with the antenna
and if you hear a lot of static you are finding noise sources. See if that noise is present at the computer, BOB, Keyboard, etc.

You may be creating a very large electrical field just by turning on /off the plasma breaker and causing an electircal field to be set
up around a recieving source and over time it can dimish ....thus things seem to work....proper shielding and grounding comes into play.
Noise sources or interference can be a cross to find. A large field source can screw up a computer and cause it to do weird things.

I am not saying that noise is your only issue.

Keep it simple and just do one axis at a time. Go through the process of elimination as suggested.

FWIW,
RICH

cheech669

• 34
« Reply #42 on: May 03, 2011, 06:36:06 PM »
The common on the bob is set for 5v but when z moves up the voltage at common goes to 2.85.

The plasma breaker has not been turned on for over a week.

BR549

• 6,965
« Reply #43 on: May 03, 2011, 06:59:02 PM »
You should be measuring from the output term to the com term and getting  5v +/-.    The dir term will read 5v in one direction and 0 in the other +/-. The step term should be 5v when active 0 when not active

Where are you measuring at to measure the com voltage?

OK I see that you have the jumper set for com=5v.  DOES your drives support this method or does it require Com=GRND ?

(;-) TP
« Last Edit: May 03, 2011, 07:11:02 PM by BR549 »

OCNC

• 23
« Reply #44 on: May 04, 2011, 12:13:29 AM »
Sorry, but I've got to ask.  Have you tried taking the BOB out of the loop yet?

Chris

cheech669

• 34
« Reply #45 on: May 04, 2011, 07:49:28 AM »
The company I got all this from gave the wiring setup as I have wired it so the drivers should support it.  I'm measuring at the bob and no I have not taken bob out since my lpt only goes to 3.3, where bob amps it up to 5.

OCNC

• 23
« Reply #46 on: May 04, 2011, 08:15:54 AM »
It seems to me that the 2.85v on the z+ move is indicating that the BOB is failing to buffer the 3.3v signal from the computer  You should only be seeing ~5v or ~0v  on the BOB.

Chris

Tweakie.CNC

• 9,208
• Super Kitty
« Reply #47 on: May 04, 2011, 08:24:26 AM »
Trash the BoB and replace it with one that works

Tweakie.
PEACE

• 34