On Friday 07 March 2014 05:34:21 Bill did opine: > Hi Gene > > Well I sat down this afternoon and worked on the configuration from > scratch and it seemed to go OK . I can't try it yet because I am still > waiting for the Breakout boards, they are on a slow boat from China. I > still have to work out how to change the hal to make the stepconf type > 5 as my steppers and driver don't suit step/dir. > > I am actually building it because I am experimenting with Magnetic > Motors and Wind Generators. The shaft and rotors on the magentic can > spin very fast so the rotors have to be very accurate. More accurate > than I can make with a circle cutter and spade bits. > > I am considering counter balancing the z axis as this is the heaviest > load on the motors, the motors will be running on 19 volts so that > should give them some oomph. > > My wife just came home from the church Kid's Club she's helping with a > the moment. We've had our tea of a meat and a chicken hot5 pie. > Delicious!! > > I've just taken a guess with the motor sizes but if they are too slow > I'll just have to upgrade, but slow speed is not a great problem it can > take all day if it needs to. I'm looking at the linuxcnc documentation > on fixing SMI issues at the moment to see if I can get away from the > potholes with the computer. I'm getting about 30,000ns max Jitter at > the moment. This is a dedicated computer, it isn't even connected to > the Internet (Linux Livid won t recognise the USB Dongle).
30,000ns jitter? That isn't very good although we did stumble around with similar figure 10 years ago. I think the worst box I ever tried had jitter in milliseconds, but it was also running the nvidia closed source drivers. Changing to the VESA drivers brought it under 20 u-s, 20,000 ns, and it would run my mill up to about 7 or 8 ipm. The intel atom boards many of us are using now will show jitters in the 2000 to 3500 ns range and can run my lathe, which has more motor voltage, at 60 ipm for the Z, Y is similar, but runs into the end of the screw since the range is only a fat 2", so fast its hard to tell. > > This was meant to be an economy project but a few cooked Arduino boards > has blown the budget. > I hear that! I have a collection of the xylotex driver boards I raid for heat sinks occasionally. Currently using a 7 pack of the 2M542 drivers from eBay. Bulletproof it seems. > These are the links to the breakout board and the Stepper motors (For > which I gave the wrong size) > http://www.tecnoflexo.com.br/site/fotos/download/17/17.pdf > http://www.robosoftsystems.co > in/roboshop/media/catalog/product/pdf/Minebea%2014PM-M201%20Unipolar%20M > otor pdf > I'll look at these after I hit send, the links are a bit mangled here. I should have advised that when posting a link, surround them with a pair of <>, the majority of email agents will search more that one line looking for the > and the browser is much happier. > It's great to have our advice, I've been googling everywhere and never > found how to contact people like this. > > Thankyou for your advice. Let me be first to advertise that I did not write the bible on this. This is the users list, and for getting your hands dirty, there is also a developers list. Many of the authors and code contributers hang out on both lists however. There is also wiki.linuxcnc.org where you can grab the latest docs, or maybe figure out how to do something semi-odd. The developers are, ATM, largely tied up trying to get the next, V2.6.0 release out the door. If you haven't updated since the cd install, the current 2.5.3 is quite an upgrade over the cd version and I think, compatible with most of the old configuration options. Do a "sudo update- manager", enter your user password, don't let it upgrade to 12.04, but do let it update everything else. That does need a net connection of course, but not direct, your local net should be NAT'ed in the router as it will then be protected by the routers firewall. I like a router with enough resources to be reflashable with DD.WRT, its solid enough the hackers see what it is and give up. If they can elicit a response from it, but that is up to you and how you have it configured. The most recent addition to my mill is an 'endoscope' camera to help me register the front and back sides of a pcb, or some such twaddle. Ball screws are laying on top of the tool cabinet for it also, but I broke the drive on my toy lathe while getting started on the nut holders for the screws, and don't quite have it back among the living yet. Putting a 1 hp treadmill motor on a 7x12 is pushing drive components into the high failure mode. :) By the weekend perhaps, > Regards Bill > > ( I'm off to watch the football, the local team the Brisbane Broncos are > playing the North Queensland Cowboys for the first game of the year) B Is it cool enough to play already? We still have snow here. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. ------------------------------------------------------------------------------ Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. With Perforce, you get hassle-free workflows. Merge that actually works. Faster operations. Version large binaries. Built-in WAN optimization and the freedom to use Git, Perforce or both. Make the move to Perforce. http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
