I am going to shopaholic a bunch of proximity sensors to replace mechanical
homing and limit switches for two machines with Mesa cards (5i25/7i77) and
then it struck me, what is the best option? NPN or PNP?
How do they behave if there's no power to them or if they fail? For example
a PNP NO, is it
On 22 Feb 2014, at 10:12, Sven Wesley svenne.d...@gmail.com wrote:
then it struck me, what is the best option? NPN or PNP?
I can't remember which type is preferred, but you probably want the shielded
type as they still work flush-mounted in metal.
You want to use NPN NC switches. This means that the circuit is
energized when in normal condition. If the switch is made the circuit
will open or if the power fails or if the wire breaks, the circuit will
be open and hence you will detect the condition on the input.
Oh and make sure it is the
2014-02-22 10:27 GMT+01:00 Marius Liebenberg mar...@mastercut.co.za:
You want to use NPN NC switches. This means that the circuit is
energized when in normal condition. If the switch is made the circuit
will open or if the power fails or if the wire breaks, the circuit will
be open and hence
Peter
The crackling is random and mainly after jog moves.
The motors are Nema34 and running at 72v and approc 4amps.
On 21/02/14 22:25, peter smith wrote:
Mark
What type of motors and voltage are you using, is the crackling random,
or specifically after a certain type of move??
Regards
You can hear it on this video
http://www.youtube.com/watch?v=aMA6B4n1bGA
On 22/02/14 09:52, Mark Tucker wrote:
Peter
The crackling is random and mainly after jog moves.
The motors are Nema34 and running at 72v and approc 4amps.
On 21/02/14 22:25, peter smith wrote:
Mark
What type of
On Sat, 22 Feb 2014, Sven Wesley wrote:
Date: Sat, 22 Feb 2014 10:12:08 +0100
From: Sven Wesley svenne.d...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: [Emc-users]
Note to those checking out the video.
You will need to have the volume turned up high.
The cracking occurs during most of the video
and it sounds like an old fashioned Geiger counter
ticking to me.
Steve Stallings
-Original Message-
From: Mark Tucker [mailto:m...@rmtucker.f2s.com]
I seem to remember there being a fix for this around v2.3 or something
to stop the stepper motors hunting.which i assume must have been a
parameter to set the tolerance for acceptable position.
Does this not apply when using hardware generated pulses?
I will have to leave the beaglebone on the
Are steps also being generated (back and forth) or is just the direction
line toggling (w/ no steps)?
On Sat, Feb 22, 2014 at 10:56 AM, Mark Tucker m...@rmtucker.f2s.com wrote:
I seem to remember there being a fix for this around v2.3 or something
to stop the stepper motors hunting.which i
Jumping in - I have had this with the MachineKit. No noise but as I had the
'scope on the signals I spotted the fidgeting Dir. I had no pulses on Step
line, just Dir hunting. I was worried that it might stop the stepper drivers
going to reduced current mode but with the ones I was using this was
John
I don't suppose you are using Gecko's?
As Jeff mentioned earlier it seems like a Gecko driver does not like the
Dir line wiggled about in that fashion.
Why it should make a noise beats me,but i can assure everyone that the
drives are running without these noises on a pc setup and have been
I usually use 24 VDC PNP NO proxs for general use for a number of reasons.
If you have voltage at the output of the sensor, then the prox is
sensing metal. Most logic is positive which seems to help the debugging
and troubleshooting process.
However if the input card requires a sinking sensor
Some background on the hunting behavior of the dir line.
It goes back to the implementation of the step generator.
This applies specifically to the software step generator,
but some of the FPGA based ones and perhaps the BBB
PRU one use the same core algorithm and have the same
behavior.
Mark
Not Geckos here but a Leadshine 3 phase stepper motor driver.
I think John K has covered more bases than I ever could.
In essence I see it as the accumulator counting up and down but not
overflowing so a step never gets emitted but the sign of the error is
changing so Dir follows this.
John
Thank you so much for the insight of how that work and it explains a lot.
But as you stated it would be hunting back and forth.Which i assume it
would have to pulse the step line?
And a number of people have scoped the outputs and only found the Dir
line hunting back and forth,i wonder why
On Sat, 22 Feb 2014, Mark Tucker wrote:
Date: Sat, 22 Feb 2014 19:20:57 +
From: Mark Tucker m...@rmtucker.f2s.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re:
On Sat, Feb 22, 2014, at 02:20 PM, Mark Tucker wrote:
John
Thank you so much for the insight of how that work and it explains a lot.
But as you stated it would be hunting back and forth.Which i assume it
would have to pulse the step line?
Lets take my example of a 100uS base thread and
On 02/22/2014 05:33 AM, Greg Bentzinger wrote:
Yeah - I did some digging and that whole L word in a fixed cycle
dates back to the original NIST RS-274D-NGC. IMHO - Its a dinosaur
that should have died out. I consider it an accident waiting to be
activated by the user.
I agree that it is
Thanks
That seems to have nailed it for me now i can very clearly understand
why no pulse is emitted on the pulse line.
Well that brings us back to the question of who is going to fix the problem?
Is there anyone else working on this other than charles that can maybe
work around this using the
On Saturday 22 February 2014 14:59:52 John Kasunich did opine:
On Sat, Feb 22, 2014, at 02:20 PM, Mark Tucker wrote:
John
Thank you so much for the insight of how that work and it explains a
lot. But as you stated it would be hunting back and forth.Which i
assume it would have to
On Sat, 22 Feb 2014, Mark Tucker wrote:
Date: Sat, 22 Feb 2014 19:57:26 +
From: Mark Tucker m...@rmtucker.f2s.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Crackling motors using
Damage the Gecko??
That is extremely unlikely.
If it is not going into standby your motor might get hot, but if you
have the Gecko properly heatsinked there should
not be an issue with it.
Dave
On 2/22/2014 2:57 PM, Mark Tucker wrote:
Thanks
That seems to have nailed it for me now i can
Yes of coarse it depends on the type of input circuit that you use.
Peter is correct for sinking inputs the PNP is best and for sourcing
inputs you will use NPN
On 2014-02-22 11:27, Marius Liebenberg wrote:
You want to use NPN NC switches. This means that the circuit is
energized when in
What is the L supposed to do?
The way I read the program the tool would:
G0 X1 Y2 Z3 - move (in G90) to X1 Y2 Z3 or (in G91) move 1 inch X
, 2 inches Y and 3 inches Z
G91 G98 G81 X4 Y5 Z-0.6 R1.8 L3 - in the drill cycle the tool would rapid
1.8 inches positive Z , move 4 inches positive X and 5
On 02/22/2014 11:16 PM, Stuart Stevenson wrote:
What is the L supposed to do?
The way I read the program the tool would:
G0 X1 Y2 Z3 - move (in G90) to X1 Y2 Z3 or (in G91) move 1 inch X
, 2 inches Y and 3 inches Z
See:
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