I just put together one of the mk7 extruders over the weekend. It is a great choice from my perspective anyway. The gecko driver will work fine. You will need a 820 ohm and 20 ohm resistor (put them in series) to set the current to the motor to 840ma. The driver will supply a constant current to the motor coil, so the voltage on the motor will go to 4.83 volts.
best regards, Steve Thatcher -----Original Message----- >From: Jeshua Lacock <jes...@3dtopo.com> >Sent: Jun 10, 2012 7:00 PM >To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >Subject: [Emc-users] 3D Printer Parts > > >Greetings all, > >I am thinking these are the parts I am going to order to get started with a >printer attachment for my CNC machine: > >http://store.makerbot.com/extruder-controller-v3-6.html > $99 >http://store.makerbot.com/stepstruder-mk7-complete.html > $199 >http://store.makerbot.com/black-abs-1kg-spool-1-75mm-filament.html $48 > >http://www.geckodrive.com/geckodrive-step-motor-drives/g251x.html $89 >_________________________________________________________________ > > $435 > > >I think that I am just going to try the MakerBot extruder controller for now >because it comes with a working thermocouple. It seems to be a pretty good >cost considering it is the power controller and thermocouple all in one (and >should "just work"). I will just have to send the M-words for temperature out >of a RS485, which based on the postings I saw should be trivial with LinuxCNC. > >Question: the gecko 251x states the minimum voltage is 15v. The extruder >stepper is rated for 5v: > >http://store.makerbot.com/nema-17-stepper-motor.html > >Also, the Gecko 251x shows more inputs than what I see on that stepper motor >(4 wires). I have never used a stepper motor before. Can anyone tell me if the >Gecko will work with that stepper? > >Oh, can anyone recommend a decent RS485 card that will just work with Ubuntu? > >Any other advice before I actually place an order would be greatly >appreciated, thanks! > > >Cheers, > >Jeshua Lacock >Founder/Engineer >3DTOPO Incorporated ><http://3DTOPO.com> >Phone: 208.462.4171 > > >------------------------------------------------------------------------------ >Live Security Virtual Conference >Exclusive live event will cover all the ways today's security and >threat landscape has changed and how IT managers can respond. Discussions >will include endpoint security, mobile security and the latest in malware >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
