Re: [Emc-users] G540 Test Update

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 an

Re: [Emc-users] G540 Test Update

On 17 April 2012 02:57, Peter wrote: > Mach3 now generates up to 100K steps/sec, Any idea how constant the frequency is at that rate? -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ---

Re: [Emc-users] G540 Test Update

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.

Re: [Emc-users] G540 Test Update

Because 20 TPI  has been a standard for manual machines for years.  Also, most small machines aren't designed for scarey rapids, so there was no need to change to a more expensive solution. And finely, microstepping does not improve accuracy only resolution. For a 200 step motor and a 10TPI yo

Re: [Emc-users] G540 Test Update

Have to completely disagree here. I have a Taig mill with a 20TPI leadscrew driven by A G540 from Mach3. I limit my rapids to 60IPM which is 40Ksteps/sec Mach3 has had a max steps/sec of 45K for about a decade. Mach3 now generates up to 100K steps/sec, So it  20K steps/sec is nowhere near the

Re: [Emc-users] G540 Test Update

On 4/16/2012 9:54 PM, Ron Ginger wrote: > 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

Re: [Emc-users] G540 Test Update

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.

Re: [Emc-users] G540 Test Update

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

Re: [Emc-users] G540 Test Update

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 o

Re: [Emc-users] G540 Test Update

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 th

Re: [Emc-users] G540 Test Update

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.

Re: [Emc-users] G540 Test Update

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 th

Re: [Emc-users] G540 Test Update

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 containe

Re: [Emc-users] G540 Test Update

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 li

Re: [Emc-users] G540 Test Update

On 16 April 2012 19:43, Kirk Wallace 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 cost similar to a PCI para

Re: [Emc-users] G540 Test Update

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 sm

Re: [Emc-users] G540 Test Update

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 fau

Re: [Emc-users] G540 Test Update

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 requi

Re: [Emc-users] G540 Test Update

> 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 turn the power off. I don't know if a fault on another

Re: [Emc-users] G540 Test Update

On 4/16/2012 1:05 PM, andy pugh wrote: > On 16 April 2012 17:58, Dave 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-re

Re: [Emc-users] G540 Test Update

On 16 April 2012 17:58, Dave 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) -- atp The i

Re: [Emc-users] G540 Test Update

On Mon, Apr 16, 2012 at 12:23 PM, Dave wrote: > Peter, > > How do the Chinese get stuff into the US so efficiently? > My conclusion is that it is heavily subsidized. There certainly is an economy of scale, but I find it hard to believe that explains everything. I was just joking with someone ear

Re: [Emc-users] G540 Test Update

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. :)

Re: [Emc-users] G540 Test Update

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 t

Re: [Emc-users] G540 Test Update

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: http://www.cnc4pc.com/Store/os

Re: [Emc-users] G540 Test Update

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 bi

Re: [Emc-users] G540 Test Update

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

Re: [Emc-users] G540 Test Update

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? That i

Re: [Emc-users] G540 Test Update

On 4/16/2012 7:59 AM, Ron Ginger wrote: > 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 us

Re: [Emc-users] G540 Test Update

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 th

Re: [Emc-users] G540 Test Update

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: > >>

Re: [Emc-users] G540 Test Update

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/ > >

Re: [Emc-users] G540 Test Update

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

Re: [Emc-users] G540 Test Update

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 distan

Re: [Emc-users] G540 Test Update

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 dr

Re: [Emc-users] G540 Test Update

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 con

Re: [Emc-users] G540 Test Update

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 high

Re: [Emc-users] G540 Test Update

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:

Re: [Emc-users] G540 Test Update

  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 ht

Re: [Emc-users] G540 Test Update

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. Am

Re: [Emc-users] G540 Test Update

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 Wall

Re: [Emc-users] G540 Test Update

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

Re: [Emc-users] G540 Test Update

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 >

Re: [Emc-users] G540 Test Update

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, an

Re: [Emc-users] G540 Test Update

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 t

Re: [Emc-users] G540 Test Update

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

Re: [Emc-users] G540 Test Update

: 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 tex

Re: [Emc-users] G540 Test Update

age- > 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 >

Re: [Emc-users] G540 Test Update

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: > http://wallacecompany.com/machine_shop

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 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: http://wall

Re: [Emc-users] G540 Test Update

andy pugh wrote: > On 14 April 2012 22:45, Kirk Wallace 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 _sink_ 15mA per

Re: [Emc-users] G540 Test Update

On 4/15/2012 11:02 AM, Peter C. Wallace wrote: > On Sat, 14 Apr 2012, Kirk Wallace wrote: > > >> Date: Sat, 14 Apr 2012 14:45:40 -0700 >> From: Kirk Wallace >> Reply-To: "Enhanced Machine Controller (EMC)" >> >> To: LinuxCNC Users List >

Re: [Emc-users] G540 Test Update

On Sat, 14 Apr 2012, Kirk Wallace wrote: > Date: Sat, 14 Apr 2012 14:45:40 -0700 > From: Kirk Wallace > Reply-To: "Enhanced Machine Controller (EMC)" > > To: LinuxCNC Users List > Subject: [Emc-users] G540 Test Update > > I set up Dan's G540 today an

Re: [Emc-users] G540 Test Update

On Sat, 14 Apr 2012 14:45:40 -0700, you wrote: >What comes to mind from my first test is that the Roswill may never work >with the G540 without an external pull-up. These 9815 based cards are by >far the most popular, so either Mach3 people are not using PCI cards >with the G540, or Mach3 is doing

Re: [Emc-users] G540 Test Update

On 14 April 2012 22:45, Kirk Wallace 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 _sink_ 15mA per pin? http://www.asix.com.tw/FrootAttach

[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 to the pin 16 output source capability. I then used a Rosewill dual