On Monday, April 16, 2012 05:11:33 AM Peter did opine:
Hi Gene,
You don't want to use an opto-isolation card with the G540 as it already
is opto-isolated.
Cheers,
peter
I may be missing something Peter, but the C1G delay is quite ignorable,
10ns, and its rail to rail 24 ma of drive
On Monday, April 16, 2012 05:18:47 AM Gary P. Fiber did opine:
I need to find the start of this thread. i am running a G540, an Intel
M525MW board
Other than both of mine are D525MW's
with Probotix steppers motors and all 3 axes move fine. I
just need to calibrate them for proper distance
On Monday, April 16, 2012 06:01:27 AM Kirk Wallace did opine:
I tried a 75AC541 buffer on the SIIG card:
http://wallacecompany.com/machine_shop/G540/g540_siig_buf.jpg
and then tried it unbuffered at 1kHz:
http://wallacecompany.com/machine_shop/G540/g540_siig_1kHz.jpg
I got a green LED on
On 04/15/2012 07:09 PM, Kirk Wallace wrote:
I have some scope traces from LinuxCNC's pump below. I haven't had time
to add text to the pictures yet but I'll try to describe them in this
message for now. The group of pictures is here:
http://wallacecompany.com/machine_shop/G540/
An BoB without opto-isolation will give you the same 24mA rail to rail output.
I just didn't see a need to pay for something that's not needed.
But then, it's your choice. :)
Cheers,
Peter
On 16/04/2012 7:17 PM, gene heskett wrote:
On Monday, April 16, 2012 05:11:33 AM Peter did opine:
Hi
On 4/16/2012 12:04 AM, emc-users-requ...@lists.sourceforge.net wrote:
My favorite fix so far is to recomend a buffer board on the parallel
port. It's the only thing a user could add that would cover most every
parallel port and the G540. A user would have a harder time fixing the
G540 or the
On Monday, April 16, 2012 10:23:30 AM Peter Homann did opine:
An BoB without opto-isolation will give you the same 24mA rail to rail
output.
You should refer to it by the URL, is this it?
http://www.homanndesigns.com/store/index.php?main_page=product_infocPath=22products_id=59
That is not
Hi Gene,
I wasn't pushing you to buy my breakout board. I'd assume you would have
bought a C10 from CNC4PC. It's a plain signal buffered board. Not as good as
mine of course. :)
As to the DC-03, I had a bit of a rush last week, so am putting another run
through the pick and place machine this
On Monday, April 16, 2012 11:52:54 AM Peter Homann did opine:
Hi Gene,
I wasn't pushing you to buy my breakout board. I'd assume you would have
bought a C10 from CNC4PC. It's a plain signal buffered board. Not as
good as mine of course. :)
Naturally. ;-)
As to the DC-03, I had a bit of
On Tue, 2012-04-17 at 01:41 +1000, Peter Homann wrote:
Hi Gene,
I wasn't pushing you to buy my breakout board. I'd assume you would have
bought a C10 from CNC4PC. It's a plain signal buffered board. Not as good as
mine of course. :)
I'm thinking the C26:
Peter,
How do the Chinese get stuff into the US so efficiently?
If you look at Ebay they are selling things in the US for less than $10
and offering free delivery!
I ordered some cables once - about $100 worth - and the guy shipped them
express mail from China for about $20. This was probably
On 4/16/2012 12:21 PM, Kirk Wallace wrote:
On Tue, 2012-04-17 at 01:41 +1000, Peter Homann wrote:
Hi Gene,
I wasn't pushing you to buy my breakout board. I'd assume you would have
bought a C10 from CNC4PC. It's a plain signal buffered board. Not as good as
mine of course. :)
I'm
On 16 April 2012 17:58, Dave e...@dc9.tzo.com wrote:
Perhaps Marris should consider adding this to the G540 and doing a USB
port power steal to drive the electronics?
Why not use some of the stepper motor power supply?
(probably isolated and re-referenced to p-port GND using a DC/DC converter)
On 4/16/2012 1:05 PM, andy pugh wrote:
On 16 April 2012 17:58, Davee...@dc9.tzo.com wrote:
Perhaps Marris should consider adding this to the G540 and doing a USB
port power steal to drive the electronics?
Why not use some of the stepper motor power supply?
(probably isolated and
gene heskett wrote:
On Monday, April 16, 2012 12:05:22 AM Jon Elson did opine:
It was described earlier that the charge pump input to the G540 is
capacitively
coupled, and apparently has a large coupling cap. If it is driving the
base of a
BJT with the cap, that would require a pretty
On 4/16/2012 1:30 PM, Stephen Dubovsky wrote:
Expense.A USB cable is cheap and that eliminates the DC-DC converter
cost since the power is coming from the proper side of the optos.
But w/ cheap comes low reliability? The USB can be power up/down by the
host. A USB fault will
On Mon, 2012-04-16 at 12:16 -0500, Jon Elson wrote:
... snip
But, I was thinking of a generic PNP or NPN transistor, but the person
who described the circuit a few days ago did not say whether it was
junction transistor or a FET.
Jon
Most of the components on the G540 are SMT and too small
On 16 April 2012 19:43, Kirk Wallace kwall...@wallacecompany.com wrote:
I'm still concerned that the G540's 10x microstepping would put it out
of the parallel port arena. It seems a 5i25 would be more appropriate,
plus taking into account other savings the 5i25 might provide, might
make it
I got a close up of the pump input area and marked up what I think is on
the board:
http://wallacecompany.com/machine_shop/G540/G540_upper_bottom_z-1b.png
So, I think C is the capacitor coupler. Then the signal drives one SMT
diode and across another (filter?) capacitor and the opto-c LED with
Oh, I don't think it is that cheap, just the west is so expensive. UPS want
$70+ to ship 500g by air.
I get charged US$80.00 for 0.4m3 @ 350kgs shipped by sea from China. So that's
$200.00 per cubic metre.
A 40ft container has a volume of 67.7 m3. So that's $13,540.00 for shipping a
On 17/04/2012 2:17 AM, gene wrote:
Probably the DC05 combo, as it will be driving the board in a 7x12.
Basically, the DC-05 is a DC-03 but without the microprocessor. The
microprocessor' main job is to convert a low frequency PWM to a higher one to
cross the opto-isolator. It means that
On 4/16/2012 7:17 PM, Peter Homann wrote:
just the west is so expensive
That is what I suspected. I was working with a company in the US that
made Casket/Coffin hardware. A strange business, but they were
successful for 30+ years. They were located about 50 miles from a
harbor in Chicago.
Kirk Wallace wrote:
Most of the components on the G540 are SMT and too small to have
markings, so I could only guess about what they are. I have some close
up pictures of the area in question, but my camera's cable has woken up
and run off somewhere. I'll post the pictures when I get this
On 4/16/2012 9:28 PM, Jon Elson wrote:
Kirk Wallace wrote:
Most of the components on the G540 are SMT and too small to have
markings, so I could only guess about what they are. I have some close
up pictures of the area in question, but my camera's cable has woken up
and run off
On Monday, April 16, 2012 09:22:01 PM Jon Elson did opine:
gene heskett wrote:
On Monday, April 16, 2012 12:05:22 AM Jon Elson did opine:
It was described earlier that the charge pump input to the G540 is
capacitively
coupled, and apparently has a large coupling cap. If it is driving
On 4/16/2012 8:54 PM, emc-users-requ...@lists.sourceforge.net wrote:
That is what I suspected. I was working with a company in the US that
made Casket/Coffin hardware. A strange business, but they were
successful for 30+ years. They were located about 50 miles from a
harbor in Chicago.
Yep, $80.00 to get it to Australia from China. About $300 to get it off
the ship to the depot. And about $250 to get it delivered 10Km away.
And they still can't work out why the West is uncompetitive.
Needless to say, I usually pick it up from the depot myself.
Cheers,
Peter.
Dave wrote:
True, but even little Nema 23 steppers have little usable torque beyond
800 rpm unless you go with a high voltage stepper drive (which the G540
is not).
Larger Nema 34 steppers are pretty useless beyond 600 rpm or so.
I used to demo my mini-mill with Gecko 201A drivers and
On Sat, 14 Apr 2012, Kirk Wallace wrote:
Date: Sat, 14 Apr 2012 14:45:40 -0700
From: Kirk Wallace kwall...@wallacecompany.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: LinuxCNC Users List emc-users@lists.sourceforge.net
Subject: [Emc-users] G540
@lists.sourceforge.net
Subject: [Emc-users] G540 Test Update
I set up Dan's G540 today and used it with three different ports. A
motherboard port which worked okay, but showed a bit of a saw toothed
wave form, so it seems the G540 pump input draws a fair amount of
capacitive load compared
andy pugh wrote:
On 14 April 2012 22:45, Kirk Wallace kwall...@wallacecompany.com wrote:
A 660 Ohm
resistor pulled the ramp up higher, but 5V / 660 Ohms = 7.5 mA and is
starting to get into an amp range that could get interesting for pin 16.
I thought that nearly all p-ports can
I have some scope traces from LinuxCNC's pump below. I haven't had time
to add text to the pictures yet but I'll try to describe them in this
message for now. The group of pictures is here:
http://wallacecompany.com/machine_shop/G540/
Motherboard port, set to SPP in BIOS:
On Sunday, April 15, 2012 09:24:08 PM Kirk Wallace did opine:
I have some scope traces from LinuxCNC's pump below. I haven't had time
to add text to the pictures yet but I'll try to describe them in this
message for now. The group of pictures is here:
-
From: Kirk Wallace [mailto:kwall...@wallacecompany.com]
Sent: Sunday, April 15, 2012 6:09 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] G540 Test Update
I have some scope traces from LinuxCNC's pump below. I
haven't had time
to add text to the pictures yet but I'll try
Wallace [mailto:kwall...@wallacecompany.com]
Sent: Sunday, April 15, 2012 6:09 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] G540 Test Update
I have some scope traces from LinuxCNC's pump below. I
haven't had time
to add text to the pictures yet but I'll try to describe
On Sun, 2012-04-15 at 22:05 -0500, Steve Stallings wrote:
Kirk,
Oops, I now realize that you did get different
result for the Startech card in EPP mode. Did
you have a utility from Startech to set that
board to EPP mode, or did you use one of the
utilities from Jon Elson or a similar
On Sun, 2012-04-15 at 21:37 -0400, gene heskett wrote:
... snip
What happens if the pump frequency is reduced to say 10% of what its set at
now?
I haven't tried that. If I disconnect the G540 so there is no load on
the parallel port pin, the charge pump is a clean square wave. I used
10x on
gene heskett wrote:
Looking at the scope traces, either the probe is way out of calibration
against the scopes own test square wave, or the 540 has a low value series
resistor, 33-120 ohm range, with several hundred pf on the other side of
the resistor as a noise filter on that input, and
On Sunday, April 15, 2012 11:55:24 PM Kirk Wallace did opine:
On Sun, 2012-04-15 at 21:37 -0400, gene heskett wrote:
... snip
What happens if the pump frequency is reduced to say 10% of what its
set at now?
I haven't tried that. If I disconnect the G540 so there is no load on
the
On Monday, April 16, 2012 12:05:22 AM Jon Elson did opine:
gene heskett wrote:
Looking at the scope traces, either the probe is way out of
calibration against the scopes own test square wave, or the 540 has a
low value series resistor, 33-120 ohm range, with several hundred pf
on the
Hi Gene,
You don't want to use an opto-isolation card with the G540 as it already
is opto-isolated.
Cheers,
peter
---
Peter Homann
http://www.homanndesigns.com/store
On Mon 16/04/12 2:04 PM , gene heskett wrote:On Sunday, April 15, 2012
11:55:24 PM Kirk
I need to find the start of this thread. i am running a G540, an Intel
M525MW board with Probotix steppers motors and all 3 axes move fine. I
just need to calibrate them for proper distance and get the homing Hall
effect sensors connected.I am not running the charge pump enabled in the
G540.
Pretty sure that the SOT 3 device will be a reverse voltage protection
diode for the opto LED diode. pf caps are not usually termed big ones.
I would ecpect that the charge pump circuitry is on the other side of the
opto.
Cheers,
Peter.
---
Peter Homann
For whatever reason, the G540 charge pump input works fine with the
Intel D525MW board and LinuxCNC.
Whether or not you use it is really up to you.
The Intel D525MW board may be the cheap fix to the G540 charge pump
compatibility issue. :-/
Dave
On 4/16/2012 12:23 AM, Gary P. Fiber wrote:
I tried a 75AC541 buffer on the SIIG card:
http://wallacecompany.com/machine_shop/G540/g540_siig_buf.jpg
and then tried it unbuffered at 1kHz:
http://wallacecompany.com/machine_shop/G540/g540_siig_1kHz.jpg
I got a green LED on both. The SIIG worked at 5kHz unbuffered too, but
peaked 1 Volt
On Sun, 2012-04-15 at 21:23 -0700, Gary P. Fiber wrote:
I need to find the start of this thread. i am running a G540, an Intel
M525MW board with Probotix steppers motors and all 3 axes move fine. I
just need to calibrate them for proper distance and get the homing Hall
effect sensors
I set up Dan's G540 today and used it with three different ports. A
motherboard port which worked okay, but showed a bit of a saw toothed
wave form, so it seems the G540 pump input draws a fair amount of
capacitive load compared to the pin 16 output source capability.
I then used a Rosewill dual
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