[solarchimesam]

what's the max pulse rate with emc with a printerport?

Sorry I can not give you a good answer on pulse rate for EMC
via printer port. Like I said I am not an expert.
Sherline uses EMC and I wonder if they could help?

I bet someone here at cnczone can answer your question !

[solarchimesam]

Thanks, I got it going, i had to put 5,200 for mine since i use 1/2 step so.
200x13x2=5,000
also like to point out to people if your axis are going the wrong way, you need to reverse them by simple putting a - in the number.

input/output = -5,200.0

solarchimesam, can you explain what the stepper.mod does? i'm a little confused on that part.

Thanks, Joe

Joe I made a mistake (well sorta) by not mentioning I am running direct drive straight form the stepper to lead screw...you picked up on that I see with 200x13x2 = 5,000
I think direct for me would be 200x16x1 then?
There is a nice calculator for that out there online but I can't find it now.

Steppermod or freqmod in EMC.INI
I am old and wear glasses now so anything I say is not parachute data.
I want to say...there is soooo much data my brain gets burned so what I did first was find out what I needed for a step/dir setup.
That is the setup I have.
So I read about the EMC.INI and found that steppermod was for step/dir and I might be wrong on this but freqmod was for closed loop encoder drives.
Anyone can please double check me on that

I am still messing with EMC and trying to do things like get it to ramp and what not..I like that ramping. I can push these old used steppers just a tad bit more with that effect. And now when the travel cut reaches the end it does now "overshoot" the corner as bad...like a VW going to fast around
the block and missing only to hit the neighbors mailbox and bouncing off.

Is this cnczone great or what?

[solarchimesam]

EMC.INI
I did some reading online concerning steppermod.o & freqmod.o
I chopped it down to make for smaller posting.

If you have stepper motors and a stepper motor controller that requires phase stepping, then freqmod.o is a solution. Phase stepping requires the computer to output the motor phase signals directly, the stepper driver is just an amplifier.

Freqmod can be used for driving stepper motors however
you need to set the value for P.
(This is located in EMC.INI)
P
I
D

There is a chapter on getting steppers to run with freqmod
You may see it at
http://linuxcnc.org/handbook/part2/freqmod.html

When using freqmod keep in mind the kind of input your stepper
driving hardware needs.
If you require only clock and direction, set
STEPPING_TYPE = 0

EMCMOT=freqmod.o
Set it to 1 if you require phase stepping, and to 2 if
you have a table driven (whatever that means) system.

[ESjaavik]

Steppermod or freqmod in EMC.INI
I am old and wear glasses now so anything I say is not parachute data.
I want to say...there is soooo much data my brain gets burned so what I did first was find out what I needed for a step/dir setup.
That is the setup I have.
So I read about the EMC.INI and found that steppermod was for step/dir and I might be wrong on this but freqmod was for closed loop encoder drives.
Anyone can please double check me on that

I use freqmod and have no feedback. It's a "virtual closed loop" in normal cases. But I believe it can alsobe used for real closed loop.

I also use glasses because it is many years since I was born. but I'm not old, as I still actually like it when things demand a bit of Brain Aerobics!

Is this cnczone great or what?

To be frank.. I think it is getting bloated! Loading the ad's for the umpteen-thousandths time is starting to make me think if I really want to continue. I'd say it was very nice.

[DieGuy]

OK let's Bump this thread.

I am currently running turbocnc, definetly adequate, but I am a Linux Junkie, and want the networking and all the Linux goodies like editing and filtering to work my cnc files.

I just did a Deskart run that was 4+ meg and transfered it via 4 floppies to my turbocnc box. painful to say the least, It would have been aneasy transfer with a Linux box.

I hate windows basicly. To damn flacky for me.

I have a Xylotex controller on a taig mill, anyone done this combination with EMC?

[anoel]

You do know that you can do networking in DOS? It's pretty easy to set up.


http://www.dendarii.co.uk/FAQs/dos-net.html

[DieGuy]

Yeah but it is a pain and what will it do to the real time charecteristics of DOS. THe turboCNC manual recommends no TSR types of stuff loaded in the config.sys or autoexec.bat, not even DOSKEY!

Where a good real time kernel in Linux will set the proper priority to the task and can interupt the kernel as needed.

[RotarySMP]

Do the newer BDI-live distro's support intergrated graphics Mobo's?

I have downloaded BDI, BDITNG and BDI Live and tried at least five diffented revision's over the last few years, on two different motherboards and three different graphics cards with no success.

A SIS 645 chipset Athlon board, an IBM PIII-800 business box with Intel chipset and intergrated graphics, ATI Expert 2000 or an older PCI matrox graphic card.

The furthest I ever got was with one of the BDI-Live CD's where it got into the reading a zillion files part before locking up on the business box with the matrox card.

In comparision TurboCNC is a real no brainer. Dos is kind of nice. Switch on machine wait ten seconds, start machining. Finish machining, close TCNC kill computor with button on front. Microsofts last stable OS.

Since I have a lathe anyway TurboCNC is a good choice, but for my up-coming mill, that CVC and CutterRadiusComp in EMC is tempting.

[DieGuy]

I guess I will find out, I was hoping that someone here would have some experience setting it up for use with a Xylotex and taig mill.

[wile_e]

Microsofts last stable OS.

It is not a OS, it is a programloader.

[ESjaavik]

Do the newer BDI-live distro's support intergrated graphics Mobo's?

A: I don't know.

I have downloaded BDI, BDITNG and BDI Live and tried at least five diffented revision's over the last few years, on two different motherboards and three different graphics cards with no success.

A SIS 645 chipset Athlon board, an IBM PIII-800 business box with Intel chipset and intergrated graphics, ATI Expert 2000 or an older PCI matrox graphic card.

A: Mine runs using a Matrox dual head PCI card. I only use it 1-head though.

The furthest I ever got was with one of the BDI-Live CD's where it got into the reading a zillion files part before locking up on the business box with the matrox card.

In comparision TurboCNC is a real no brainer. Dos is kind of nice. Switch on machine wait ten seconds, start machining. Finish machining, close TCNC kill computor with button on front. Microsofts last stable OS.

A: Well OS might be stretching it a bit by today's standards.

Since I have a lathe anyway TurboCNC is a good choice, but for my up-coming mill, that CVC and CutterRadiusComp in EMC is tempting.
I use EMC for my mill, working OK. But it will not do lathe yet. So that's where I seem to end up too: using TCNC.

Reply is inside quoute if my HTML works.

[Jan]

Dieguy
check this link for xylotex and emc:
http://wiki.linuxcnc.org/cgi-bin/emc...l?XylotexBoard
I would suggest to use the radio shack method, you'll understand once you read the material

RotarySMP
You might want to check the archives at:
http://sourceforge.net/mailarchive/f...orum=emc-users
or send an email to the list, also there is an irc channel

jerry

[DieGuy]

Dieguy
check this link for xylotex and emc:
http://wiki.linuxcnc.org/cgi-bin/emc...l?XylotexBoard
I would suggest to use the radio shack method, you'll understand once you read the material
jerry

Thanks, That is exactly what I was looking for. I hate to reinvent the wheel! I will just pull off a recompliation on the BDI install assuming the source is avaialble in the distribution.

Now has anyone played with EMC2. The compliation should not be a problem. Getting the Real time linux might be an issue. I will post back this weekend after I "fix up" the current controller PC with a hard drive and CDROM. It works A-OK with turboCNC but DOS is so featureless.

I bet an AMD XP2400 should be adequate.

[smi4motion]

I have installed 3 versions of the BDI (Brain Dead Installs) With Varying degrees of success. Mostly due to the lack of updated Driver support and my own lacking of knowledge of how the “Make” utility works. The Debian based version seems to be the most forgiving as far as hardware is concerned but the Morfix BDI lite is would appear to be perfect for those of us not yet good enough at Linux to give up our MS dope just yet. The Debian version comes with QCAD for doing 2d basic CAD stuff. Both of these versions have an option for installing in the free space on your current HD And I believe it will allow you to create a disk to boot to if you wanted a duel boot system. The Red Hat 6 ver. of the BDI didn’t run to well on my test computer (video card support).
We are looking at developing a line of small scale Gantry Tables using the EMC stuff so feel free to send me any wish list type items that would make your lives easier.

[ESjaavik]

So someone waked up this thread again.
You should try out Pico-systems.com Universal Stepper Board. Since my last post above, I installed it here on a EMC BDI RC46. It is just unbelievable how much smoother my steppers runs now! I can now run as fast as my drives/motors will allow. No coarse running as with freqmod. I'm now up to around 3500mm/min compared to 500mm/min before. And the limit is that I have only 70V to feed the motors, not the ability to emit equally spaced step pulses.

As the pulses are generated in hardware, there is no skew or jitter on the pulse train. This works so well I have now mothballed my plans to change to servos. I can no longer see any need for that.

Disclaimer: I have no connection with Pico-Systems other than being a very happy customer.