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Re: DRO boards
Dan Mauch
It requires just a few parts . See Tom Kulaga's discussion earlier today
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about other parts required. Dan -----Original Message-----
From: Mark Fraser <mfraser@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Saturday, May 29, 1999 6:41 PM Subject: Re: [CAD_CAM_EDM_DRO] DRO boards From: Mark Fraser <mfraser@...>tube discussion of shop built systems in the above catagories.the length of the strip. I use a tube as a pushrod and as the conduit for discussion of shop built systems in the above catagories. |
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Re: Question For Dan Mauch
Dan Mauch
As you may know I have been using the L297/L298 combo for nearly 5 years. I
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have also been using the Superior electric D200 which is similar. I designed a PC board to fit this module and have a three and four axis version. The module will go to 2.5 amps. You can set the current anywhere from .5 to 2.5Amps. I am using a 36VDc supply with it. They run great. I was running my full size mill with 450 oz in motors with them for two years before switching to servos. The D200 does not lend itself to simply adding mosfets to the output because you would loose the current sensing in the choppers. Since they are sealed there is no way to connect the sense resistors. That is why I chose the ericsson 3776 chip for my 5 amp chopper. Coinsidently, Kevin Carol was also working with this chip and we both found it superior to run descrete mosfets. Dan -----Original Message-----
From: William Scalione <scalione@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Saturday, May 29, 1999 5:55 PM Subject: [CAD_CAM_EDM_DRO] Question For Dan Mauch From: William Scalione <scalione@...>discussion of shop built systems in the above catagories. |
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Re: DRO boards
Dan Mauch
No ,you have not sent me the rotary axis version yet. I'd be delighted to
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test it. I was over a friends house yesterday. He has a 4 axis CNC with a rotary table. The software for the CNC ( maxnc) does linear moves on the A axis. We figured out how to convert it to degrees. That sure would have been nice to have the 4 th axis in degrees and why I know that the DR0 should have that feature. As Always, I'll get prompt feed back to you. Dan -----Original Message-----
From: Tom Kulaga <tkulaga@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Saturday, May 29, 1999 10:35 AM Subject: Re: [CAD_CAM_EDM_DRO] DRO boards From: Tom Kulaga <tkulaga@...>haveI have placed the order for a batch of Printed circuit boards for the -2/4 discussion of shop built systems in the above catagories.first shot at them. Right now I have 35 boards on order which gives a fewWow, 15-16 bucks for the board? That's pretty good. The encoder |
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Re: Digest Number 28
Andrew Werby
From: john@... (John Stevenson)
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Subject: Aha and Servos On Sat, 29 May 1999 12:16:11 +0100, you wrote:
Andrew, Contary to popular opinion the Ahha controllers can now control servo's. As you already have a working controller you should be able to hook up to your existing servo amps and save the cost of a servo card. I went this way with my conversion as with all the help I received from the UK agent for Ahha it made it quick and painless, especially for someone like myself who is not capable of working these thing out for himself. Added to the fact that I needed this machine up and working to earn a living I didn't have the time to experiment. In fact from start to actually getting the machine under power took less than 5 hours. I don't believe that Ahha web site has been updated for quite a while but the servo work is actually being carried out by the Uk agents, Eagland Machine Tools. They have a web site at www.eagland.co.uk Regards, John Stevenson Nottingham, England [Thanks, John. I've been getting conflicting advice about this- is there a model number for the Aha controllers that work with servos? Do they come with opto-isolater relays, or do you get those separately? There was somebody who was going to sell me an Aha controller, but he said I'd have to switch to steppers, which I didn't want to do. I wonder if the ones he had were an older style. Are you running EMC in Linux, or did you figure out something else that works? Like you, I'd like to spend my time milling instead of experimenting, if possible.] Andrew Werby From: Jon Elson <jmelson@...> Subject: Re: Linux vs. DOS Andrew Werby wrote: [Oh. I really don't know anything about Linux, but it seems intimidating.Well, there is somewhat of a learning curve, and a fair amount of work to set up the system for the first time. But when you get down to running the machine, it really works quite reliably, with essentially no further attention. [Is there anybody that sells computers with the right flavor of Linux preinstalled? Although this might be more expensive than doing it myself, if it saves weeks of headache it might be worth it.] The kernel is the basic center of the operating system. If you don't like the way your Win-NT is configured, you are pretty well out of luck. If you don't like the configuration of your linux kernel, you can edit the configuration (graphically) and re-compile. It takes less than 30 minutes on a Pentium. It would be a simple install, except for the real-time patch. Apparently somebody is selling a CD with a real-time patched RedHat Linux that will install directly, without you having to install the patch. [Anybody know who this might be?] I should note there are people running Linux that have had their machines up for YEARS without rebooting. I'll also note that once I got the hardware all stable, I have had no crashes with Linux. I have had earlier versions of the EMC program that malfunctioned or hung up. The current version appears to be ROCK SOLID! [That sounds good, I'll admit. I know I'm going to have enough trouble getting the hardware working- debugging an operating system I have no clue about doesn't sound like much fun.] I read some previous discussion here on the fine pointsNT is not a real time system. There are real-time extensions to NT, but they didn't work as well as the people at NIST wanted, and had a $2000 per machine license, I think. Has anybody built a graphical userOf course! There are several, including a windows-like environment. I'm using X windows, and it is fine for what I'm doing. This is all on the CD. [That would be the patched RedHat Linux CD you were referring to above?] Is there a Linux forI've heard of such a thing. You certainly need to at least get a book on using the Unix user environment, or specifically Linux. Probably any Barnes&Noble or B. Dalton's has such books. [Would that be better than leaving the old relays in place?The version of EMC I'm using sends all the auxilliary control signals out the printer port. For the safety of your PC, if not yourself, it is pretty wise to use opto isolators. They aren't too expensive. A Grayhill card and 5 or 6 opto-relays will cost about $50. These are compatible with the Opto-22 modules, just a lot cheaper. You will likely cobble together some combination of opto-relays and the existing relays to run things. The machine tools I've seen seem to run most of the control stuff off 110 Volts. The opto-relays are for pretty small loads, up to 5 Amps or so. So, you often use the opto-relays to control the coils of the bigger relays, especially for the spindle motor. [That makes sense. Where do you get the Grayhill card and opto-relays?] Also, can youHmm, sounds like my fireplace. Whenever it gets humid, the fireplace smells like natural gas. My wife was always worried the house was going to blow up. (It wasn't that strong, just detectable.) Well, we finally had the gas log disconnected, and the smell still shows up under humid conditions. All I can figure is some rainwater gets inside the thing, and seeps into crevices, breeding anaerobic bacteria. This is the same thing that makes coolant sumps stink, especially on Monday morning, after the plant has been shut down and sealed over the weekend. Does the machine have a coolant sump? If so, the sump or anyplace stray coolant may have settled could be causing the smell. [That's probably it- the machine does have a sump full of antique water soluble coolant. But it's strange that the smell is so strong in the control box, while the sump itself doesn't smell so bad.] Also, I';ll bet you're smelling H2S, not CH3SH (methyl mercaptan). They smell somewhat alike (note the chemical similarity) and I think the mercaptan is only produced under high temp, pressure or both, like in an oil well. [From my winemaking experience, I learned the difference between mercaptans (the natural gas smell) and H2S (hydrogen sulfide, or rotten eggs) . This is definitely the former. Left to itself, H2S will change to mercaptans inside a wine bottle, so I don't think much heat or pressure is necessary. Natural gas, by the way, is odorless when extracted- the mercaptans are added so you can detect it.] [If you'd rather, we could take this off-list, but it seemed we were stillWell, I don't think STG really has any software that does true real-time control under NT or DOS. They do have some DOS demos, but they are just loops, not real time. Yes, initially, I didn't want to go through the learning curve of Linux, but EMC showed REAL promise, even 18 months ago. I certainly couldn't find any true servo package (from the ground up) that I could afford. And, the idea of having servos controlled by step pulses from a program that thinks it is driving steppers soulds almost worse than just using steppers (which I hate, in this application). I couldn't be more happy now with EMC. I did go through a LOT of hassle, but I think the way has been cleared for those that follow. Jon [I salute you, brave pioneer! I also really appreciate the time you've taken to explain all this- thanks again.] Andrew Werby Message: 19 Date: Sun, 30 May 1999 00:29:06 -0400 From: "Matt Shaver" <mshaver@...> Subject: Re: Linux vs. DOS 1. If you have the brains to contemplate retrofitting a servo controlled cnc mill, do machine work as a hobby, and subscribe to this newsgroup, then you have enough brains to deal with Linux. [I was afraid you'd say that. With all the work I'm trying to accomplish, the grey matter is getting stretched pretty thin...] It looks really bad going into it, but once you get over the initial hump in the learning curve it's not bad at all. In fact Linux is becoming more and more popular all the time, so unless you're already retired, there's more than a small chance you're going to have some contact with it in the future if you work with or around computers for a living. There's no time like the present to get up to speed. By the way, DOS has a kernel too. It is found in two hidden files in the root directory of the boot disk called MSDOS.SYS and IO.SYS. There doesn't seem to be a /dos/src directory though... One difference between the two systems is that support for accessory hardware devices is handled in DOS by loading device drivers in the CONFIG.SYS file with a line such as DEVICE=C:\MYDEVICE.SYS. In Linux this support is provided by including the code in the kernel which means that the kernel is re-compiled to add support for new hardware. In truth, Linux also has loadable modules as well, but they are optional. Also, in Linux, there are directories full of files that perform the function of DOS's AUTOEXEC.BAT and CONFIG.SYS. [Are there any other big differences between how Linux works and other operating systems? I suppose the biggest hump in the learning curve is to figure out what new things I need to learn, and what are more or less the same things but with different names. ] 2. Linux is a much more reliable OS (doesn't lock up, get weird, or give you the "blue screen of death") than Win95/98 or NT and the only alternatives for a real time control application are systems like QNX and LynxOS which are specifically meant for real time control. They are expensive and there is a lot of debate (and I mean among guys with PhD behind their names) on the RTLinux mailing list about whether there is any real advantage to these systems over RTL. [RTL stands for Real Time Linux?] 3. All the inexpensive control programs that folks talk about on RCM and this list such as DanCAM, MaxNC, Stepster, etc. are only for use with stepper motor systems. This is to say that they output axis motion commands in the form of step and direction signals. You would be much better off to keep your existing servo motors, amps, and encoders due to their higher performance. [That was my feeling as well. ] This leaves alternatives like Lighthouse Software (big $), Delta-Tau (MEGA $), Bestsoft (no one can seem to get tech support), or a commercial control such as Centroid or Fanuc, or ... This is the gap that the EMC fills. [And EMC is shareware? Sounds too good to be true...] 4. See my previous, very long post, for comments on NT and real time. 5. Caldera's latest version of OpenLinux has a graphical install and comes with a nice window manager called KDE (which I use on my Red Hat Linux system as well). You can download KDE from .The only problem is that the EMC doesn't run under the newer 2.2 version of the kernel yet, so you'll need to stick with Red Hat 5.2 (which uses the 2.0.36 version of the kernel) for the moment. The installation isn't as bad as you think, and you'll reduce your problems a lot if you pick hardware from the compatibility list you can find at l . [It looks like I'm going to have to buy a new computer to run this beast, so this list will be helpful, thanks. Is the compatibility different for different kernels, or is it all basically the same?] 6. Yes, I think there is a Linux for Dummies book, but there is also a lot of documentation that comes with the boxed version of Red Hat Linux. [Where do I get that? Does it have all the different versions of the kernel?] There is a printed installation manual and many helpful files in /usr/doc once you get it up and running. In fact the online documentation on networking goes into some information on how Microsoft's networking scheme works, and this helped me solve some Win 95 problems I had been having! There is also the Linux Documentation Project at . [Would that be better than leaving the old relays in place? Also, can youYou'll need most, if not all of the existing electrical gear in your control to run thing like the spindle, coolant pumps, etc. The solid state relays that Jon refers to are simply an interface between the TTL level world of the computer and the coils of the power relays you are talking about which are probably actuated by 24 or 110 volt signals. You really need to understand how you present system works before you attempt to change it. Are their any schematics or other documentation like a maintenance manual that came with the machine, or which you could get? These will be INVALUABLE to you when you go to rewire things! [Fortunately, this machine did come with a manual- I think I saw some schematics in there someplace. Now all I have to do is figure out how to read them...] I'll venture a guess that the smell is transformer varnish cooking. [Wouldn't that be a burned sort of smell? This is like fresh gas- I wonder if it's from fermenting PCBs.] [If you'd rather, we could take this off-list, but it seemed we were stillWhat they are talking about are real time extensions to NT written by Venturcom and other third party developers. I don't believe they have as good a level of performance as RTLinux, probably because the developers didn't have access to all the source code for the NT. In addition these extensions cost a lot of money for the developers kit, plus a per machine runtime license, in addition to the cost of NT itself. As for writing your own algorithms, if you can do that, well, let's just say you don't need any of my advice. [Yeah, I wish- no, that part was what made me think this was way out of my range.] I'm happy to see this discussion stay on the list as I think there is a subset of subscribers who is interested in this sort of thing. As I've said before, if you need any help in getting the EMC up and running, don't hesitate to call or write. Matt Shaver (410) 521-3715 mshaver@... [Thanks- you'll be hearing from me plenty, I'll bet...] Andrew Werby Andrew Werby - United Artworks Sculpture, Jewelry, and Other Art Stuff |
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Re: Linux vs. DOS
Matt Shaver
Thank you for your instruction sheet on setting up the rt patch andbut then I get an error message that the stepper module file does not exist.if I remember correctly the documentation directory, but they are all empty.Is it possible that I got a bad .tgz file or are the files for theseThe permission denied problem can be cured by doing: cd /usr/local/nist/emc chmod 777 run.64step378 Do a 'man chmod' for more info on this command, but essentially you are giving yourself permission to execute this script file. The reason I supplied this script is that the scripts (like run.stepper) that come with the distribution aren't correct in several respects: 1. They don't load the schedule module. 2. The directories for the RT modules are wrong. Start up two terminal windows, cd to /usr/local/nist/emc and do 'less run.64step378' in one and 'less run.stepper' in the other. Scroll through the files and compare the lines that start with: insmod ... You'll see the differences right away. If you still have trouble with run.64step378 once you change the file permissions as above then check to make sure that the files referenced by the insmod lines actually exist. By the way, you need to be logged in as root to run the EMC program. If you have any other problems just call or write. If it works I'd love to hear about that as well... Matt Shaver (410) 521-3715 mshaver@... |
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Re: Linux vs. DOS
Tim Goldstein
Matt
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Thank you for your instruction sheet on setting up the rt patch and installing EMC. With your help I now seem to have rtlinux running. I seem to be having a problem with the EMC part though. I followed your directions and when I execute run.64step378 I get a message "Permission Denied". Also, if I try run.stepper I see on the command line emc start, but then I get an error message that the stepper module file does not exist. When I look under the plat directory I have the rtlinux, linux2.0.36, and if I remember correctly the documentation directory, but they are all empty. Is it possible that I got a bad .tgz file or are the files for these directories in a separate download. Appreciate all the help. Tim [Denver, CO] -----Original Message----- |
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Re: DRO boards
Jon Elson
Tim Goldstein wrote:
From: "Tim Goldstein" <timg@...>Yes, I could certainly do this. It really isn't going to make any difference to you, however, as nobody else is ordering the kit this way. There have already been about 30 boards sold, and you are the first to want it that way. I actually have a few parts here and there, from my own construction of a batch of these amps. How many units did you want? I have a parts list somewhere around here with price for all but a couple of the parts. I'll send that to you, so you can get some idea of the total parts cost. Jon |
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Re: My new mill
Jon Elson
Tim Goldstein wrote:
Jon,Yes, there is a readme for the xemc. I'm not exactly sure where it is, but I think it goes in the documentation directory /usr/local/emc/doc... when you install the whole EMC system. There are some files in the emc web pages at NIST that describe the setup file, and what each parameter does. I should caution you that, while the text-based user interface (keystick) does still work, it is no longer up to date. A number of improvements in ease of use, reliability, and controllability have been added into the Xemc program. I don't believe that these updates were put into keystick in parallel. Keystick would be OK for checking out the system, but xemc is a MUCH easier and more 'enjoyable' program to use. It puts a lot more information on one screen, whereas you have to flip between about 3 or 4 screens to keep track of what is happening with keystick. With keystick, you are sort of flying blind. Jon |
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Re: Linux vs. DOS
Matt Shaver
Andrew Werby wrote:1. If you have the brains to contemplate retrofitting a servo controlled cnc mill, do machine work as a hobby, and subscribe to this newsgroup, then you have enough brains to deal with Linux. It looks really bad going into it, but once you get over the initial hump in the learning curve it's not bad at all. In fact Linux is becoming more and more popular all the time, so unless you're already retired, there's more than a small chance you're going to have some contact with it in the future if you work with or around computers for a living. There's no time like the present to get up to speed. By the way, DOS has a kernel too. It is found in two hidden files in the root directory of the boot disk called MSDOS.SYS and IO.SYS. There doesn't seem to be a /dos/src directory though... One difference between the two systems is that support for accessory hardware devices is handled in DOS by loading device drivers in the CONFIG.SYS file with a line such as DEVICE=C:\MYDEVICE.SYS. In Linux this support is provided by including the code in the kernel which means that the kernel is re-compiled to add support for new hardware. In truth, Linux also has loadable modules as well, but they are optional. Also, in Linux, there are directories full of files that perform the function of DOS's AUTOEXEC.BAT and CONFIG.SYS. 2. Linux is a much more reliable OS (doesn't lock up, get weird, or give you the "blue screen of death") than Win95/98 or NT and the only alternatives for a real time control application are systems like QNX and LynxOS which are specifically meant for real time control. They are expensive and there is a lot of debate (and I mean among guys with PhD behind their names) on the RTLinux mailing list about whether there is any real advantage to these systems over RTL. 3. All the inexpensive control programs that folks talk about on RCM and this list such as DanCAM, MaxNC, Stepster, etc. are only for use with stepper motor systems. This is to say that they output axis motion commands in the form of step and direction signals. You would be much better off to keep your existing servo motors, amps, and encoders due to their higher performance. This leaves alternatives like Lighthouse Software (big $), Delta-Tau (MEGA $), Bestsoft (no one can seem to get tech support), or a commercial control such as Centroid or Fanuc, or ... This is the gap that the EMC fills. 4. See my previous, very long post, for comments on NT and real time. 5. Caldera's latest version of OpenLinux has a graphical install and comes with a nice window manager called KDE (which I use on my Red Hat Linux system as well). You can download KDE from .The only problem is that the EMC doesn't run under the newer 2.2 version of the kernel yet, so you'll need to stick with Red Hat 5.2 (which uses the 2.0.36 version of the kernel) for the moment. The installation isn't as bad as you think, and you'll reduce your problems a lot if you pick hardware from the compatibility list you can find at l . 6. Yes, I think there is a Linux for Dummies book, but there is also a lot of documentation that comes with the boxed version of Red Hat Linux. There is a printed installation manual and many helpful files in /usr/doc once you get it up and running. In fact the online documentation on networking goes into some information on how Microsoft's networking scheme works, and this helped me solve some Win 95 problems I had been having! There is also the Linux Documentation Project at . [Would that be better than leaving the old relays in place? Also, can youYou'll need most, if not all of the existing electrical gear in your control to run thing like the spindle, coolant pumps, etc. The solid state relays that Jon refers to are simply an interface between the TTL level world of the computer and the coils of the power relays you are talking about which are probably actuated by 24 or 110 volt signals. You really need to understand how you present system works before you attempt to change it. Are their any schematics or other documentation like a maintenance manual that came with the machine, or which you could get? These will be INVALUABLE to you when you go to rewire things! I'll venture a guess that the smell is transformer varnish cooking. [If you'd rather, we could take this off-list, but it seemed we were stillWhat they are talking about are real time extensions to NT written by Venturcom and other third party developers. I don't believe they have as good a level of performance as RTLinux, probably because the developers didn't have access to all the source code for the NT. In addition these extensions cost a lot of money for the developers kit, plus a per machine runtime license, in addition to the cost of NT itself. As for writing your own algorithms, if you can do that, well, let's just say you don't need any of my advice. I'm happy to see this discussion stay on the list as I think there is a subset of subscribers who is interested in this sort of thing. As I've said before, if you need any help in getting the EMC up and running, don't hesitate to call or write. Matt Shaver (410) 521-3715 mshaver@... |
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Re: Linux vs. DOS
Jon Elson
Andrew Werby wrote:
[Oh. I really don't know anything about Linux, but it seems intimidating.Well, there is somewhat of a learning curve, and a fair amount of work to set up the system for the first time. But when you get down to running the machine, it really works quite reliably, with essentially no further attention. The kernel is the basic center of the operating system. If you don't like the way your Win-NT is configured, you are pretty well out of luck. If you don't like the configuration of your linux kernel, you can edit the configuration (graphically) and re-compile. It takes less than 30 minutes on a Pentium. It would be a simple install, except for the real-time patch. Apparently somebody is selling a CD with a real-time patched RedHat Linux that will install directly, without you having to install the patch. I should note there are people running Linux that have had their machines up for YEARS without rebooting. I'll also note that once I got the hardware all stable, I have had no crashes with Linux. I have had earlier versions of the EMC program that malfunctioned or hung up. The current version appears to be ROCK SOLID! I read some previous discussion here on the fine pointsNT is not a real time system. There are real-time extensions to NT, but they didn't work as well as the people at NIST wanted, and had a $2000 per machine license, I think. Has anybody built a graphical userOf course! There are several, including a windows-like environment. I'm using X windows, and it is fine for what I'm doing. This is all on the CD. Is there a Linux forI've heard of such a thing. You certainly need to at least get a book on using the Unix user environment, or specifically Linux. Probably any Barnes&Noble or B. Dalton's has such books. [Would that be better than leaving the old relays in place?The version of EMC I'm using sends all the auxilliary control signals out the printer port. For the safety of your PC, if not yourself, it is pretty wise to use opto isolators. They aren't too expensive. A Grayhill card and 5 or 6 opto-relays will cost about $50. These are compatible with the Opto-22 modules, just a lot cheaper. You will likely cobble together some combination of opto-relays and the existing relays to run things. The machine tools I've seen seem to run most of the control stuff off 110 Volts. The opto-relays are for pretty small loads, up to 5 Amps or so. So, you often use the opto-relays to control the coils of the bigger relays, especially for the spindle motor. Also, can youHmm, sounds like my fireplace. Whenever it gets humid, the fireplace smells like natural gas. My wife was always worried the house was going to blow up. (It wasn't that strong, just detectable.) Well, we finally had the gas log disconnected, and the smell still shows up under humid conditions. All I can figure is some rainwater gets inside the thing, and seeps into crevices, breeding anaerobic bacteria. This is the same thing that makes coolant sumps stink, especially on Monday morning, after the plant has been shut down and sealed over the weekend. Does the machine have a coolant sump? If so, the sump or anyplace stray coolant may have settled could be causing the smell. Also, I';ll bet you're smelling H2S, not CH3SH (methyl mercaptan). They smell somewhat alike (note the chemical similarity) and I think the mercaptan is only produced under high temp, pressure or both, like in an oil well. [If you'd rather, we could take this off-list, but it seemed we were stillWell, I don't think STG really has any software that does true real-time control under NT or DOS. They do have some DOS demos, but they are just loops, not real time. Yes, initially, I didn't want to go through the learning curve of Linux, but EMC showed REAL promise, even 18 months ago. I certainly couldn't find any true servo package (from the ground up) that I could afford. And, the idea of having servos controlled by step pulses from a program that thinks it is driving steppers soulds almost worse than just using steppers (which I hate, in this application). I couldn't be more happy now with EMC. I did go through a LOT of hassle, but I think the way has been cleared for those that follow. Jon |
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Re: stepper drive info
Dan Falck
Just ask Dan Mauch about it. He has pc boards already made up with the
layout and a description. He also has a full kit. Initially, I made my own pc boards by engraving the copper clad boards on my cnc mill. Now I am getting too busy and Dan already has the boards made up- so I bought one from him. Ericsson is going to stop shipping one of the chips that is key to this design, so I suggest you talk to Dan before you delve too much into this. They (Ericsson) have a web site- but I am sorry that I can't remember it (www.ericsson.com??). Dan Nashville, TN. At 10:24 PM 5/29/99 -0400, you wrote: From: "R.Dean, Nr Atlanta, GA" <cmsteam@...>discussion of shop built systems in the above catagories. |
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stepper drive info
R.Dean, Nr Atlanta, GA
I sure would like to see this Drive diagram. Finding cnc info
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sources is very difficult. I can build one from a schematic. Dan, is this available via web or e/m? regards, Rich Dean (snip) My favorite DIY stepper drive is the Ericsson design that Dan Mauch has Dan Falck --
. .~ ~ ~~ ~~____~,~~ ~~~__ . \------ |OO|_[]_[]__\/O . .|_CMRy_|-|__|________|_|. .____oo__oo__--"O=O=O"=[]oo\\____________________________________ .--Colorado Midland Railway---Rich---cmsteam@.... |
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Re: Question For Dan Mauch
Dan Falck
I have some of those drives. The ones that I got came from General
Controls. They got them from SGS. They are actually pretty good drives- they ran very well, seemed immune to electrical noise, never blew up :) I don't think that you could use them to piggyback on to bigger mosfets and still have current limiting/control. The L297 has a pin on it that reads the voltage going across a sensing resistor that indirectly tells it how much current the H-bridges is outputting. You would need to be able to gain access to this resistor and even then, you don't have the the phase outputs from the L297 (a, A, b, B). So, you would be better off starting from scratch on that one. One thing that the SGS book says is possible is to run several L298s or L6203s (3 amp pentawatt chip) in parallel. But, sadly, in practice a lot of people have found that this isn't reliable. Check out the Stepper motor discussion forum at www.eio.com. There is a lot of info on the SGS stuff. The dallas robotics club has a web page that shows a rough sketch of a scaled up L298. I think that Roger Arrick drew this on a piece of paper- but I don't know if it's been tested. It is described as being capable of 10 amps or more using big-ass mosfets. You would need to build two of these H-bridges to replace every L298. My favorite DIY stepper drive is the Ericsson design that Dan Mauch has now. It uses 2 ICs and 8 mosfets to put out over 5 amps. Apparently, with good design, and good shielding, good airflow, it should be able to put out 10 amps- I ran 9 amps for a little while, before roasting some mosfets. Ask Dan about the 5amp boards/kits. Dan Falck Nashville,TN. At 08:01 PM 5/29/99 -0500, you wrote: From: William Scalione <scalione@...>discussion of shop built systems in the above catagories. |
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Re: DRO boards
Mark Fraser
So, I missed the earlier discussion on this item - what else will I need to
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a) populate the board, and b) drive it? (a pointer is fine, thanks) / mark Dan Mauch wrote: From: "Dan Mauch" <dmauch@...> |
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Question For Dan Mauch
William Scalione
Dan, or anyone else who might know;
Have you ever tried to use an SGS Thompson GS-D200? It is basically a L297/L298 with most of the glue components in one module. Add a couple resisters, a current limiting pot and some wire and your done. What I was wondering about was since the output is only 2 amps could those outputs be run into some high power transisters to acheive approx 10 amps. If so how would the current limiting be accomplished? Design so the gain of the output transisters is approx. 5 then adjust the current limiting pot on the GS-D200 (or L297/L298 combo) to equal 2 amps at the output of the H-Bridge (2A * 5 = 10A)? Thanks Bill |
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Re: Linear bearing types?
William Scalione
Don Hughes wrote:
Don; Danplot will read a HPGL plot file, and output the steps to a controller that takes step and direction inputs from the parallel port. Also you can make the Z axis trip a relay or transister instead of driving a motor. Talk to Dan Mauch at Camtronics and here. What will you bu using the laser for? Is it for cutting wood? If so, how much power does that have to be and how much would a laser like that cost. Bill |
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Re: DRO boards
Tim Goldstein
Dan,
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Any though of packaging the board together with all the required components to make a complete kit? It seems as if this should save some cost over each of us purchasing the components individually. I would be more than willing to send you the money up front for mine. Tim [Denver, CO] -----Original Message----- |
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Re: My new mill
Tim Goldstein
Jon,
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I see that you are running the X interface for EMC. I find the files xemc and XEmc in the ftp directory under linux_2_0_36. Are there any readme files or instructions on how to use these files with the text based EMC program? Tim [Denver, CO] -----Original Message----- |
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