-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 7/7/2013 1:10 PM, Jon Elson wrote: > Charles Steinkuehler wrote: >> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> >> I am getting close to being able to put together one of the >> "delta" style 3D printers, and I will need to put more thought >> into homing. >> >> The current state-of-the-art for this in the Arduino world is >> shown in the following videos: >> >> http://www.youtube.com/watch?v=1eNz1l56H5E >> >> http://www.youtube.com/watch?v=rTuql1iJMAQ >> >> The process is as follows: >> >> * Each joint is homed to a switch at the top of the travel range >> (you can barely see the belts moving for this at the beginning of >> the video) which provides approximate homing >> >> Question: How do I begin to hook in a homing procedure like this >> to LinuxCNC? >> > It seems like each vertical slide could have an optical sensor that > detects a known position of that slide. Then, you home each one > in joint mode, and set a home offset from that position. By making > measurements, you should be able to calculate the right offset from > the sensor to make the rest of the geometry work. The min and max > travel limits can then be set from the home position.
Yes, with a home switch on each of the joint axis, I can home them as normal. This gets me past the first step. What I don't understand is how to go from there (roughly homed joint axis) to running a motion procedure to probe the exact bed position. Once the actual bed position and orientation is determined (it's probably not *EXACTLY* level), I can apply a coordinate offset that should zero out the actual bed position. The part I don't know how to do is create a clever motion-based bed level probe routine that runs some "canned" motion cycles (to extend and retract the probe) and some "controlled by the probe switch" motion to do the actual probing. Did I miss the manual section on setting up probing? Is this sort of probing possible with LinuxCNC? - -- Charles Steinkuehler [email protected] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlHZyqMACgkQLywbqEHdNFy2ewCgnVwsf5YzFaMlTI/37dLC7/MQ S9cAoKY8iVOIt47UOWjeZPw69d6T6h+/ =ZxP/ -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
