Documentation on Ohmikron's parallel interface in on separate page dedicated to PPT1006 . Follow detail links from SDS0707's page
When you mentioned "brushed DC servo system" were you talking about IMService's DeskCNC ? At the moment it's over my budged. What would be advantage(s) of it over CNC system using stepper motor for hobby use ? If I don't plan production runs or any other kind of shop like use for my system, I think I should be fine with stepper motors. On Wed, 2008-06-18 at 10:40 -0700, Kirk Wallace wrote: > On Wed, 2008-06-18 at 11:44 -0400, Sergey Izvoztchikov wrote: > > I had couple direct emails with Phil. He wasn't willing to provide > > more details then on his web site. SDS accepts control signals over > > parallel port and seems to use Xylotex like mapping of pins. Phil > > said it would worm fine with EMC, but I have no idea how easy or > > difficult would it be to configure. > > I didn't see much documentation on the website. If the SDS has a Xylotex > pin out, EMC has a Xylotex sample configuration you can can use as a > starting point. Basically you will need to set the timing parameters and > connect port pins. This is done in at least two text files that you can > edit with a common text editor. For instance: > > net Xstep stepgen.0.step parport.0.pin-03-out > > connects the step signal to the first parallel port pin 3. This gives > you the power to configure your system any way you want, even if it's > the wrong way, but that's usually how I learn. > > > Is there also signal shape > > configuration per CNC control system ? What I mean is will I have > > to configure duration and value of fronts/peaks for signals coming > > to SDS ? Any idea ? > > I haven't worked with this type of stepper system so I don't know for > sure, but EMC has a program call Stepconf: > > http://www.linuxcnc.org/docview/html//config_stepconf.html > > >From what I have heard, the program output is only as good as the input. > It is important to get accurate timing parameters from the manufacturer > to plug into the program. Or Stepconf can make it easier to "cut and > try". > > > I'm very new to CNC. Have some experience with machining. At the moment > > I only have Sherline 4000 manual lathe. > > Personally, if you haven't invested in hardware yet, I think you should > consider going to a brushed DC servo system. In the long run, I think > you will learn more and have a better machine at a similar cost. In my > opinion, you can ease into CNC conversions with a servo system by > fitting encoders and use EMC as a DRO. When you get that sorted out, > then add spindle speed control, or servo motors, mist or other options > one at a time. There is less waste this way because each subsystem can > be used in the final system. You can use the parallel port PWM and wire > up a basic drive to get started and then move to a PWM controller and > higher power drives later if you need more speed. > > > Sherline factory CNC systems > > support only manual control over spindle speed. I was set to follow > > along the same line. Control from CNC system over spindle speed would > > be a great extra thing to have. But I have no idea how to implement it. > > Chris Radek has a Sherline that uses a KBIC style spindle controller: > > http://timeguy.com/cradek/cnc/lathe > > The KBIC controllers can be found on eBay at really good prices if you > are patient. > > > I plan to get CNC conversion kits for my lathe and future mill and then > > hook them up to Xylotex or Ohmikron CNC driver. 4 axles are planned. > > > > Have to learn a lot of new things, terms and embrace a lot of new > > ideas and information. > > > > PS: Was there a thread dedicated to pros and cons of different CNC > > drivers for Sherline mills and lathes overs here ? If there was one > > I would really appreciate a pointer to it. > > I don't know of any pro/con links. Your best bet is to watch the list > for responses. Allot of the active EMC people are at the CNC fest right > now, next week may be a better time to ask. > > I have just started using the IRC to get live help: > > http://www.linuxcnc.org/component/option,com_mospjirc/Itemid,8/lang,en/ > http://freenode.net/using_the_network.shtml > > This has worked well for me. > > FWIW, my website covers some of the above issues here: > http://www.wallacecompany.com/machine_shop/ > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
