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Re: concrete/molded structural elements
"John Glynn" <[email protected]
Hello,
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I know that concrete type material(Granitan ) is\was used extensively instead of cast iron castings for the beds of high precision grinding machines. Also, I have have seen grinding colums filled with similar material for vibration damping during the grinding of tungsten carbide. Hope this is of some use. Regards John- recent member of the lurking clan -----Original Message-----
From: DAFcnc <DAFcnc@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: 31 May 1999 08:23 Subject: Re: [CAD_CAM_EDM_DRO] concrete/molded structural elements From: DAFcnc <DAFcnc@...>withMessage: 2 discussion of shop built systems in the above catagories.[]vibration. I am using aluminum and steel extrusions and box channel forI saw formula once for strength in tubular structures, something to doI think I am going to try to fill my hollow structural parts with aNot being an engineer, I ask your indulgence if this suggestion is |
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Re: Linux vs. DOS
Matt Shaver
From: "Matt Shaver" <mshaver@...>that's OK, just hit ENTER at the end.In fact this command wrapped in my e-mail, it's really one long command! Matt |
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Re: Linux vs. DOS
Matt Shaver
So, here is where I am now.:modules, one for the network card and another that is a 4 digit number that starts./run.mystepper This seems to start out fine and I see starting emc and then installingrmmod manually, I get the error noted above.OK, let's reboot to get rid of all the installed modules, etc. and do this by hand rather that by script. As user root from a terminal window in X do: cd /usr/local/nist/emc insmod -v /usr/src/rtl/modules/rtl_sched insmod -v /usr/local/nist/emc/plat/rtlinux_09J/lib/steppermod.o SHMEM_BASE_ADDRESS=0x3F00000 PARPORT_IO_ADDRESS=0x378 plat/linux_2_0_36/bin/mmio -ini 64stepper.ini & plat/linux_2_0_36/bin/mmtask -ini 64stepper.ini & plat/linux_2_0_36/bin/xemc -ini 64stepper.ini The long commands may wrap to the next line in the terminal window, that's OK, just hit ENTER at the end. This should get the EMC started without all the fancy error checking stuff in that script file. Let me know if you get any errors from this procedure. You are not the only guy to have trouble with these script files, although I can't figure out what the problems are caused by. Thanks, Matt P.S. If you want to call today (Memorial Day), I'm around and not that busy, so if you need to do that it's OK. (410) 521-3715 |
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Re: Linux vs. DOS
Tim Goldstein
Matt,
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Thanks again for your kindness in helping. Here is where I am at now. The problem was that I removed the !/bin/csh -f line as I was originally getting a message about invalid parameter and the csh parameter list would appear. So, I figured the line was commented out so that removing it shouldn't hurt and that error went away. Silly me!!. I tried to put the line back in and the original error returned even when I copy and pasted it out of the run.stepper file (which produces plenty of errors, just not the csh error). I ended up opening the run.stepper file for edit and deleting all except the first line and saving it as run.mystepper in the /usr/local/nist/emc directory and then running "chmod o+x run.mystepper" command that Jon gave me. Now I could execute run.mystepper with out any errors so I opened it for edit and copy and pasted all of the run.64step378 file into it except for the first line that I had from the run.stepper file. So, here is where I am now.: I boot up and go to a terminal window in X and issue lsmod I see 2 modules, one for the network card and another that is a 4 digit number that starts with 8 and I can't remember the rest. Next I switch to /usr/local/nist/emc and enter the command ./run.mystepper This seems to start out fine and I see starting emc and then installing motion module. Then I get the following error message: segmentation fault rmmod: steppermod: devise or resource busy rmmod: rtl_sched is in use And that is where it leaves me. If I then enter lsmod I see steppermod and rtl_sched in the list with the previous 2 entries. steppermod is marked as [uninitialized]. If I try rmmod manually, I get the error noted above. Any ideas of what I should try now. Thanks again, Tim [Denver, CO] -----Original Message----- |
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Re: Linux vs. DOS
Tim Goldstein
Jon,
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Thanks for the chmod o+x command. Matt gave me the chmod 777 command and that took care of the permissions problem on the script file, but I ended up having to create a new copy and use the o+x switch to make it executable. Tim [Denver, CO] -----Original Message----- |
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Re: plastic strips for encoders
Dan Mauch
I don't think any of the red lion displays will work with the linear
encoders because the linear stips are 200 count and 360 count. The X1,X2X4X10 multipliers don't work out to give the display the correct reading. But R/L has surprised me before with new displays that do some interesting things. I talked with US digital about a 250 count and a 500 count linear strip but no-joy, they don't have them. Dan if your electronics are a computer then the HP readers and correspondingdiscussion of shop built systems in the above catagories. |
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Re: plastic strips for encoders
Dan Mauch
They chose mylar because of its temperature stability.
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I have used them for about a year now and have seen no problem with them. Dan -----Original Message-----
From: Elliot Burke <elliot@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Sunday, May 30, 1999 1:49 PM Subject: [CAD_CAM_EDM_DRO] plastic strips for encoders From: "Elliot Burke" <elliot@...>discussion of shop built systems in the above catagories. |
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Re: Digest Number 27
DAFcnc <[email protected]
Message: 6shouldn't be an issue at all, though an LCD panel may be slow to update and you'll see a blur instead of changing numbers. newer active panels aren't so bad. someone mentioned earthing.... that should not be an issue, no laptop I've used has ever been earthed through it's power supply, most having only 2 wires going in anyway. therefore all you need to do is run an earth wire from the sockets at the back to a good earth point. attach your earth wire to one of the little mounting studs next to one of the serial ports. just do a double check before you do this though, by using a VOM between the the PSU power plug and the plug that goes into the laptop, just to check for any solid connections. there shouldn't be. the biggest danger to the machine is a differnce in 'earth' levels between the laptop and the CNC electronics when you're plugging the thing into the parallel port. this can only happen if there's problem in your earthing circuits in the first place. (I've had 100 volts between a PC earth plugged into one side of a room and a laser pritner plugged into the other side, plug em all into the same wall socket) steam and wind -- David Forsyth DaForce A-T Iwr.Ru.Ac.Za Keeper of the listserver for South African Railways fans _|_ His Part time gricer, kiter, photographer, father etc etc | Way | Up |
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Re: My new mill
DAFcnc <[email protected]
Message: 5[] the worst part is that the DOS environment is not secure!just remember, that no matter what software you use, ALWAYS have an emergency stop button that kills the power supply/s directly, with no software inbetween. sure, the software can detect it too, and stop whatever it's doing, but the first priority is to power down those motors. (place I worked for was doing a machine with an embedded 68hc controller which had the emergency stop into the board/software. one day it went mad and coudl not be stopped, so we had 2.5 tons of machine bouncing around the floor. it was under development and so had not been bolted down (erroneously, bolt everything down), and since it had out of balance moving parts, it bounced under high speed input. normal operation called for controlled slowish speed rotation, so balance was not an issue. I know someone will ask what the thing did.... it was a shock absorber tester, loadcell on the end of the shock, and an adjustable throw crank with 11kw 3phase motor and gearbox to swing it at various rates to test the pressure differentials. eventually the 68hc board was discarded as not fast enough and we fitted a 486 and I rewrote the software in Qbasic 4. this had the advantage of being able to display the load graphs directly, though I had a nice runaround to get the code fast enough (try a 500 line subroutine, any 'gosubs' to do menial tasks slowed it down too much,and this was when compiled) (yes, I wanted to do it in C, which would have worked first time, but the boss decided Qb was quicker to program for the graphics and the thing was already over time and over budget) steam and wind -- David Forsyth DaForce A-T Iwr.Ru.Ac.Za Keeper of the listserver for South African Railways fans _|_ His Part time gricer, kiter, photographer, father etc etc | Way | Up |
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Re: plastic strips for encoders
Ron Wickersham
On Sun, 30 May 1999, Elliot Burke wrote:
Many people have written about using the US Digital plastic strips forhi Elliot, another tass* guy here too :-) you are of course correct that a plastic scale would be suspect, but the scale is probably a piece of litho film. if the film is clamped or glued to the machine, then even if the film overhangs in the clear for the reader, then it would be constrained by the machine structure. i believe that there would be interest in an "open source" effort on scales for machines, and the HP readers don't have the desired increments. so we could design a reader with english increments of say .001 inch and get the reader grill and scales produced on 8 mill litho film by photoplotters with high accuracy which make tooling film for printed circuit boards. these wouldn't have the accuracy of the chromium on glass scales, but would be adequate for many of us on this list. if your electronics are a computer then the HP readers and corresponding scales are no problem to compute, but some people would like smaller units and there are inexpensive quadrature counters with LCD screens, for instance from Red Lion, that would work with such a project's scales. -ron rjw@... *www.tass-survey.org |
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Re: concrete/molded structural elements
DAFcnc <[email protected]
Message: 2[] I saw formula once for strength in tubular structures, something to doI think I am going to try to fill my hollow structural parts with aNot being an engineer, I ask your indulgence if this suggestion is with the difference between the outside and inside diameters, and the conclusion was that filling a strong walled pipe (in that case it was carbon fibre reinforced plastic - used in kites) with lighter, weaker stuff (foam?) would not affect the bending coefficients much at all. So I think your molding will need interior struts to increase the damping, which is hard to achieve effectively with a molding process, and you might as well make them solid parent material. On a related question, how would reinforced concrete work for the bedI would rather use a welded frame covered with sacrificial chipboard, then at least you don't lose router bits to your bed material (so often) (-: Something like the one shown here Geoffsteam and wind -- David Forsyth DaForce A-T Iwr.Ru.Ac.Za Keeper of the listserver for South African Railways fans _|_ His Part time gricer, kiter, photographer, father etc etc | Way | Up |
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Re: Linux vs. DOS
Jon Elson
Tim Goldstein wrote:
From: "Tim Goldstein" <timg@...>Right. You have to do a chmod o+x {filename} to set the file to be executable. If you've already done that, then you need to be root, or give root privledges to the kernel module that becomes the real-time component of EMC. Also, if I try run.stepper I see on the command line emc start, butAs I understand the current distribution, the stepper code is only built if you do something in the makefile to enable the stepper version. This is temporary. Jon |
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Re: Linux vs. DOS
Matt Shaver
Well, I played around a little more and applied the Microsoft trick (shutrunning insmod and it worked as it should. I then booted to the rtlinux kerneland now it seems that I can issue insmod from the command line and it works."command not found" errors. Is there a way to put in an echo or something in thebe found.Hey, quit gettin' ahead of me here! ;) 1. Just put in lines like: echo "your_message_goes_here" This is done a lot in the run.64step378 file already. 2. Make sure that the line: #!/bin/csh -f is the very FIRST line in the file (no blank lines above)! 3. Check the plat/linux_2_0_36/bin/ directory to see that mmio, mmtask, and xemc are there. 4. Check that the path to the EMC code is /usr/local/nist/emc. Note that 'cd /usr/local/nist/emc' is on of the first lines in run.64step378. I'm here till late, so you can even call if you want. Matt (410) 521-3715 |
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Re: Linux vs. DOS
Tim Goldstein
Well, I played around a little more and applied the Microsoft trick (shut
down and reboot) and booted back to the original kernel (I left it as an option in Lilo along with an option to boot to Windows 95). I tried running insmod and it worked as it should. I then booted to the rtlinux kernel and now it seems that I can issue insmod from the command line and it works. Unfortunately, when I try ./run.64step378 I still get a number of "command not found" errors. Is there a way to put in an echo or something in the run.64step378 file so I can get an idea what the commands are that can't be found. Again, thanks for all your help. Tim [Denver, CO] |
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Re: Linux vs. DOS
Matt Shaver
My new problem is that when I execute run.64step378 I get a number ofOK: 1. You must be logged in as root to use insmod. 2. The insmod program lives at /sbin/insmod so make sure this file exists (insmod is part of Linux itself, not the EMC). 3. If the insmod program exists then try doing a '/sbin/insmod' from the command prompt. When insmod is run without any arguments you should get a message like "Usage:..." then a detailed syntax diagram and brief instructions. Here the troubleshooting flowchart forks: 4a. If '/sbin/insmod' works, but 'insmod' by itself doesn't then the /sbin directory isn't in your path. Check this by entering 'echo $PATH' at the prompt and your path will be displayed. It might look like "/do/re/mi:/sbin:/fa/so/la:...". If /sbin isn't there you can either add it in your .bash_profile file in the /root directory (if you look at this and it's not self evident how to do this, just let me know). I'm not sure where the PATH is set initially, but if this is the problem I'll research it further and figure out what to do. Many initialization files reside in /etc. Another option would be to edit run.64step378 and change the lines that start with insmod to /sbin/insmod. 4b. If /sbin/insmod doesn't exist then my initial reaction is to say something along the lines of "Uh, like wow man, I dunno". Since this isn't very helpful I think that you should (from a terminal window in X) do 'cd /usr/src/linux' and then 'make xconfig'. Look in the "Loadable module support" section and be sure that all three items in there are set to "y". Also, and I'm stretching it here, check in the "General setup" section and see if "Support for a.out binaries" and "Support for ELF binaries" are set to "y" as well. If you change any of this you'll need to save the changes and continue on with 'make dep', 'make clean', 'make zlmage', 'make modules', 'make modules-install', and finally 'cp arch/i386/boot/zImage /boot/vmlinuz'. I don't know whether this process actually creates the /sbin/insmod file when loadable module support is enabled, or not, but it's all I can think of right now. One other thing, when you installed Red Hat 5.2 did you pick "Everything" from the list of stuff to install, or did you use the "Workstation" option or ... I always pick the "Custom" choice and then install "Everything", although I can't imagine that insmod is optional in any case as it's pretty important. Let me know what happens ASAP and I'll try to get you going. Thanks, Matt Shaver (410) 521-3715 |
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Re: Linux vs. DOS
Tim Goldstein
Matt,
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Your Linux wizardry again got me over a hump and now I have run smack into another one. the chmod command took care of the permissions and I must have had a bad download as I downloaded the emc program again and reinstalled it and now I have files in all of the directories. My new problem is that when I execute run.64step378 I get a number of "command not found" errors. In poking through the run.64step378 file it looks like the problem is with the insmod command. If I try insmod at a command line I also get "command not found" and in searching the drive I find a bunch of copies of insmod.1 (the man page for insmod), but I cant find the actual file. Is there a module I may have missed installing? Thanks again. Tim [Denver, CO] The permission denied problem can be cured by doing: |
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plastic strips for encoders
Elliot Burke
Many people have written about using the US Digital plastic strips for
encoders. Has anyone calculated the thermal effects of the plastic? The CTE of plastics is so much larger than other engineering materials that even a few degrees F over a foot will make a very inaccurate measurement. When I get to my office I'll look up the exact numbers, but they are freightening. If the strip was glued to a piece of glass it would work better, but might not fit in the reader. If the encoders use transmissive optic a metal backing wouldn't work. Elliot Burke HighTide Instruments |
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Re: DRO boards
Mark Fraser
Didn't arrive in my mailbox, can someone please forward it to me /
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thanks / mark Dan Mauch wrote: From: "Dan Mauch" <dmauch@...> |
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Re: stepper drive info
Dan Mauch
I sell a silkscreen Printed circuit board that makes it easy if you want to
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do it from scratch. But I also have a complete kit. See my webpage at Quite a few people have built them. Talk to Tim Goldstein on this group. He can tell you what he thinks about the 5 amp kit. Dan -----Original Message-----
From: R.Dean, Nr Atlanta, GA <cmsteam@...> To: CAD_CAM_EDM_DRO List <CAD_CAM_EDM_DRO@...> Date: Saturday, May 29, 1999 7:24 PM Subject: [CAD_CAM_EDM_DRO] stepper drive info From: "R.Dean, Nr Atlanta, GA" <cmsteam@...>with outgood design, and good shielding, good airflow, it should be able to put 10 amps- I ran 9 amps for a little while, before roasting some mosfets. |
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