Nema17 and LinuxCNC - Raspberry Pi Forums

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hi

not n00b raspberry pi, python or programming. new using stepper motor pi.

looking build cnc machine can send file on wireless , launch linuxcnc (which have compiled own kernel) , start cutting.

have:
- 3 x nema17 stepper motors
- 3 x hg7881 h-bridge drivers
- 1 x raspberry pi custom linuxcnc kernel
- cabling required

issue having nema17 stepper motors have 4 cables, hg7881 has 4 inputs , 4 outputs , have them wired correct way around according polarity of stepper motor linuxcnc has 2 outputs per stepper motor configured raspberry pi settings using. 1 wire step , other drive. how connect step/drive (2 cable) setup linuxcnc 4 inputs on hg7881 h-bridge? or need piece of hardware in between pi , stepper motors replace h-bridge, going wrong?

h-bridge talking about:
http://www.ebay.com.au/itm/190866391027 ... 1439.l2649


regards
tom o'brien

hi tom,
inventor_tommy wrote:1 wire step , other drive.
how change rotation direction ?

current software , hardware not compatible... need make decision side you're going modify. if you'd change hardware, might consider using l297.


best wishes, ivan zilic.


raspberrypi



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