Re: [Emc-users] Plasma Table
Jack In this case Google is your friend. There are literally thousands of ideas from guys who have done their own thing. Two things I recommend that you don't do without. 1: You must fit a THC of sorts. Especially if you are going to cut thinner materials. 2: You must fit a water bed for your own health's sake. Also you can minimize the warping if you cut in water. Do a table that can cut a full sheet. The cost will not be that much more. Most of the cost goes into the linear devices and the control system (drivers, motors etc) On 2013/09/06 04:47 AM, Jack Coats wrote: Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 130905-1, 2013/09/05 Tested on: 2013/09/06 08:36:18 AM avast! - copyright (c) 1988-2013 AVAST Software. http://www.avast.com -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Servo motor watts VS torque?
2013/9/6 Gregg Eshelman g_ala...@yahoo.com On Thu, 9/5/13, Sven Wesley svenne.d...@gmail.com wrote: ... gantry weight around 80-90 kg and is driven by small Nidec servos rated at 80 V (really small). That's not even 200 pounds. The table on this mill is 10x50 - 25.4x127 centimeters, 4 - 10cm at its thickest, of cast iron, plus the saddle. That's a lot of weight to move, which I'm not in the least interested in removing unless or until it absolutely needs to be. You miss my point, in relation to the weight the motors are really small. In fact, pretty many on this mailing list said it was not possible to run a machine with such small motors. Still, I cut metal at high speed. It's not the motors that are weak, it's the spindle. Is the table five times the width in length? If it is solid 10 cm you have 258 kg moving weight. Lets say you want 10m/s, 0.3 seconds in acceleration time, 5 mm pitch and 300 kg moving mass you will end up with a need of 0.5 Nm to drive the table at 500 N applied cutting force and 4.1 Nm to accelerate. Assume you don't have linear guides (i.e. sliding guides) you need 4.5 Nm to accelerate. That is a peak value. I have a set of 4 Nm constant tourqe motors in the workshop rated 750 W, they are beefy bastards. You don't need that. Of course you could have it if you like speed and nasty accelerations (I'm the last to say else, I like overkill), but then you also need a fat ball screw that doesn't bend and preferably cooling on the ball nuts. Go large if you want, it's not necessary though. /Sven -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Table
2013/9/6 Marius Liebenberg mar...@mastercut.co.za Jack In this case Google is your friend. There are literally thousands of ideas from guys who have done their own thing. Two things I recommend that you don't do without. 1: You must fit a THC of sorts. Especially if you are going to cut thinner materials. This is easy and cost effective with THCAD card from Mesa. 2: You must fit a water bed for your own health's sake. Also you can minimize the warping if you cut in water. Cutting in water will harden the material. But I do agree that some kind of smoke removal is mandatory. Based on geographical location and temperatures in winter, downdraft table and simple ventilator that sucks the smoke and gases out of the workshop might be a solution. There are _lots_ of videos on youtube, where one can see, how others have built their diy plasma machines. Since the question is about hints of mechanical design, all the builds of Mach users also might worth looking at. I did build a plasma table with 6x2 m work envelope with a downdraft table, I could share something from the 3d model, but I consider it to be above hobby level in terms of linear rails, motors, gearboxes, so I am not sure, how useful could that be. -- Viesturs -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On Thu, 9/5/13, Jon Elson el...@pico-systems.com wrote: Subject: Re: [Emc-users] BeagleBone Image Available To: Ron Bean bucketwo...@rbean.users.panix.com, Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 8:08 PM Ron Bean wrote: I still don't see a benefit in using a BB with a Bridgeport class machine I tend to assume that a single-board computer like the Beaglebone would be more reliable than a desktop PC, just because it has fewer moving parts. All Bridgeport mill and Romi lathes made since 1980 (maybe earlier) had desktop PC motherboards in them. We have 3 at work like that. --- One manufacturer of CNC punch presses used Macintosh IIcx mainboards and designed their control hardware and software to work only with a IIcx and the System version shipped with the machine. Can't upgrade to a IIci or Quadra 700 or any other NuBus Macintosh or a newer System or Mac OS, it Just Won't Work. ;-) -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Table
On Thu, 9/5/13, Jack Coats j...@coats.org wrote: Subject: [Emc-users] Plasma Table To: Enhanced Machine Controller (EMC) Emc-users@lists.sourceforge.net Date: Thursday, September 5, 2013, 8:47 PM Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack Lots of people have built them from scratch and saved a lot of money. I was going to build one for a shop here but then one evening I decided to search Criagslist for CNC and found a 5x10 foot Torchmate 3 for $9,000 with a Thermal Dynamics Cutmaster 82, so the shop owner bought that instead. No problem, I get to use it. ;-) -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Table
Yes, I built my own plasma table. http://s47.photobucket.com/user/johnplctech/library/Plasma%20Cutter?sort=3page=1 In these videos I didn't have a THC http://www.youtube.com/watch?v=e70jdiDm7yc http://www.youtube.com/watch?v=knf3cPrZPrk http://www.youtube.com/watch?v=3o84BzF90JM http://www.youtube.com/watch?v=qlXCdfPsQUU http://www.youtube.com/watch?v=EC1_TTlsOrM http://www.youtube.com/watch?v=KvhvQu5Xxtk And the latest http://gnipsel.com/shop/plasma/plasma.xhtml I designed the table to be 50 in X and 36 in Y and I can slide a sheet of up to 1/4 thick under the extruded aluminum to cut longer pieces. I usually get my stock in 4' x 4' so the first cuts it sticks out the front or rear some. I did this to save floor space. The last photos show the best water table position. JT On 9/5/2013 9:47 PM, Jack Coats wrote: Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Running simulator as a static
I have a few computers with a live OS (Porteus, great little distro). I've tried to setup up the simulator but even though it looks to me that I have the missing libs installed they are still missing. I want to run a few of these with LinuxCNC for educational and testing purpose. Has someone tried (successfully) to run LinuxCNC static? /Sven -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Table
John I take it that you used the Mesa THCAD with your current THC comp? On 2013/09/06 12:55 PM, John Thornton wrote: Yes, I built my own plasma table. http://s47.photobucket.com/user/johnplctech/library/Plasma%20Cutter?sort=3page=1 In these videos I didn't have a THC http://www.youtube.com/watch?v=e70jdiDm7yc http://www.youtube.com/watch?v=knf3cPrZPrk http://www.youtube.com/watch?v=3o84BzF90JM http://www.youtube.com/watch?v=qlXCdfPsQUU http://www.youtube.com/watch?v=EC1_TTlsOrM http://www.youtube.com/watch?v=KvhvQu5Xxtk And the latest http://gnipsel.com/shop/plasma/plasma.xhtml I designed the table to be 50 in X and 36 in Y and I can slide a sheet of up to 1/4 thick under the extruded aluminum to cut longer pieces. I usually get my stock in 4' x 4' so the first cuts it sticks out the front or rear some. I did this to save floor space. The last photos show the best water table position. JT On 9/5/2013 9:47 PM, Jack Coats wrote: Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 130906-0, 2013/09/06 Tested on: 2013/09/06 04:34:54 PM avast! - copyright (c) 1988-2013 AVAST Software. http://www.avast.com -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On Fri, Sep 6, 2013 at 12:23 PM, Kirk Wallace kwall...@wallacecompany.comwrote: On 09/05/2013 02:31 AM, Mark Wendt wrote: ... snip That's not a LinuxCNC/Axis error, that's an X error. There should be something in the X logs that point to the problem. Look in your home directory for the .xsession-errors file. Should say in there what parameter caused the X window to barf. ... snip Thank you for your reply Mark. So far this log is Greek to me: http://www.wallacecompany.com/machine_shop/LinuxCNC/xsession-errors If you happen to have a guess at the problem, please let me know. I will be looking at it. I also set this up with a regular PC and got the same result, so it is not just a BBB thing. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ Kirk, A little Google-fu on the error Major opcode of failed request: 109 (X_ChangeHosts) turned up this: http://ubuntuforums.org/showthread.php?t=1480094 You did say you were running VNC, correct? If so, check post #2 and #4. Mark -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On 09/05/2013 02:31 AM, Mark Wendt wrote: ... snip That's not a LinuxCNC/Axis error, that's an X error. There should be something in the X logs that point to the problem. Look in your home directory for the .xsession-errors file. Should say in there what parameter caused the X window to barf. ... snip Thank you for your reply Mark. So far this log is Greek to me: http://www.wallacecompany.com/machine_shop/LinuxCNC/xsession-errors If you happen to have a guess at the problem, please let me know. I will be looking at it. I also set this up with a regular PC and got the same result, so it is not just a BBB thing. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepgen rate proportional to vector velocity
On 6 September 2013 16:54, Ralph Stirling ralph.stirl...@wallawalla.edu wrote: I suspect I need to create a stepgen in velocity mode for the syringe, and connect its velocity command to the product of hypot with the three velocity-fb pins and the gain parameter. Yes, that is exactly what I was about to suggest when I read the title of the email. So, I am afraid I can be of no further help. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] stepgen rate proportional to vector velocity
I am setting up a dispensing application, and would like to drive a stepgen at a rate proportional to the current vector velocity. I recall reading some discussion of this kind of application a year or two ago, but can't find it in the archives. Basically, I have a little Haydon linear stepper actuator driving the piston of a syringe. I want to start dispensing with an M code, and have the dispense rate proportional to the velocity of the nozzle tip. I will use a parameter to set the proportionality. Does anybody have a hal configuration that does something like this? I'm using a Mesa 7i43, so have hostmot2 stepgens with velocity-fb pins. I suspect I need to create a stepgen in velocity mode for the syringe, and connect its velocity command to the product of hypot with the three velocity-fb pins and the gain parameter. I can envision the details taking a few hours to figure out though :-(. Thanks, -- Ralph -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepgen rate proportional to vector velocity
One more question on the way to a solution. I've found references on how to pass hal signals to ngc programs, but not vice versa. If I want to use a parameter from my ngc program in my hal logic, how do I pass it? Will I need to hijack something like spindle speed or can I pass arbitrary parameters via some mechanism? Thanks again, -- Ralph From: andy pugh [bodge...@gmail.com] Sent: Friday, September 06, 2013 9:17 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] stepgen rate proportional to vector velocity On 6 September 2013 16:54, Ralph Stirling ralph.stirl...@wallawalla.edu wrote: I suspect I need to create a stepgen in velocity mode for the syringe, and connect its velocity command to the product of hypot with the three velocity-fb pins and the gain parameter. Yes, that is exactly what I was about to suggest when I read the title of the email. So, I am afraid I can be of no further help. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On 09/06/2013 10:05 AM, Kirk Wallace wrote: On 09/06/2013 09:32 AM, Mark Wendt wrote: ... snip You did say you were running VNC, correct? If so, check post #2 and #4. ... snip I installed tightvnc on the LinuxCNC PC. For fun, I tried running glxgears through VNC and it failed. Xlib: extension GLX missing on display :1.0 Error: couldn't get an RGB, Double-buffered visual This seems to have fixed it: sudo apt-get install libgl1-mesa-swx11 -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] BeagleBone Image Available
On 09/06/2013 09:32 AM, Mark Wendt wrote: ... snip You did say you were running VNC, correct? If so, check post #2 and #4. ... snip I installed tightvnc on the LinuxCNC PC. For fun, I tried running glxgears through VNC and it failed. Xlib: extension GLX missing on display :1.0 Error: couldn't get an RGB, Double-buffered visual -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] stepgen rate proportional to vector velocity
On 6 September 2013 18:33, Ralph Stirling ralph.stirl...@wallawalla.edu wrote: If I want to use a parameter from my ngc program in my hal logic, how do I pass it? http://www.linuxcnc.org/docs/html/gcode/m-code.html#sec:M67-Analog-Output -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifes -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Creating Screw Compensation
Well that was interesting. I created a, modest, screw compensation file and I'm most impressed by the effect. I added a limit switch for X home in the middle of the table (to get some repeatability of the axis screw position) and did: HOME reset DRO X-Axis G0 X100 take reading from DRO X0 take reading from DRO Here's the results without any backlack or screw compensation in the .ini file. 99.905 0.155 99.905 0.155 99.910 0.165 99.900 0.150 99.910 0.155 Kind of what I expected as the table's being driven in the positive direction to get to X0 after tripping the home switch so there's no initial backlash for the positive move to X100. The return trip in the negative direction shows my typical backlash. Adding a screw compensation table (type 0 with entries for every 10mm over a 150mm run) and repeating the above I got: 99.995 0.010 99.995 0.005 99.995 0.010 99.995 0.010 100.000 0.010 That's a lot better and pushed the error down an order of magnitude into the limits of my DRO's accuracy :-) Remembering the negating effect of the homing sequence on the positive backlash I thought I'd be sneaky and drive the table in the negative direction before the test to maximise the backlash effect. HOME G0 X10 X0 reset DRO X-Axis to zero X100 take reading from DRO X0 take reading from DRO Here's what happened: 100.005 0.000 100.000 0.000 100.010 0.000 100.010 0.000 100.010 0.000 I don't quite understand how Linuxcnc managed that but I'm not going to examine the gift horse's gnashers too closely! I'll just conclude that the time to produce a screw compensation table is time well spent. I'm planning on doing a bit of nut tweakery to minimise the backlash and then doing a proper high-as-I-can-resolution compensation table run across the whole of the X Y axis. When I'm done I'll update the wiki page with my experience for other newbies. -- Regards, Russell | Russell Brown | MAIL: russ...@lls.com PHONE: 01780 471800 | | Lady Lodge Systems | WWW Work: http://www.lls.com | | Peterborough, England | WWW Play: http://www.ruffle.me.uk | -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Plasma Table
Correct my current setup is Mesa 5i25, 7i76, THCAD and Gecko 203v's with Nema 23 triple stack steppers. JT On 9/6/2013 9:34 AM, Marius Liebenberg wrote: John I take it that you used the Mesa THCAD with your current THC comp? On 2013/09/06 12:55 PM, John Thornton wrote: Yes, I built my own plasma table. http://s47.photobucket.com/user/johnplctech/library/Plasma%20Cutter?sort=3page=1 In these videos I didn't have a THC http://www.youtube.com/watch?v=e70jdiDm7yc http://www.youtube.com/watch?v=knf3cPrZPrk http://www.youtube.com/watch?v=3o84BzF90JM http://www.youtube.com/watch?v=qlXCdfPsQUU http://www.youtube.com/watch?v=EC1_TTlsOrM http://www.youtube.com/watch?v=KvhvQu5Xxtk And the latest http://gnipsel.com/shop/plasma/plasma.xhtml I designed the table to be 50 in X and 36 in Y and I can slide a sheet of up to 1/4 thick under the extruded aluminum to cut longer pieces. I usually get my stock in 4' x 4' so the first cuts it sticks out the front or rear some. I did this to save floor space. The last photos show the best water table position. JT On 9/5/2013 9:47 PM, Jack Coats wrote: Has anyone done a DIY plasma table, or have suggestions I could find out about a DIY version? I am a rookie and just learning, wanting to find out if it could be practical for a hobby setup. TIA, Jack -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Modbus TCP? Latency?
On Mon, Sep 2, 2013 at 1:06 PM, John Morris j...@zultron.com wrote: Best of all is to use a dedicated NIC and crossover cable for each device. Practically all modern network cards have polarity autonegotiation Auto-MDIX. I think this is at hardware level. -- Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58041391iu=/4140/ostg.clktrk ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
