Gene Heskett wrote: > On Sunday 28 September 2008, Jon Elson wrote: > >> >> But, no reversing, I assume. >> > > Ahh, emc does have as one of its m# commands, a "start reverse", and I do > have > it hooked up, not terribly useful without the encoder, but ISTR it does work, > I have it tied to one of those teeny relay's in the PMDX-106 which in turn is > clanking a 10 amp P&B DPDT relay to swap the motor leads. So reverse works > both from that teeny little toggle on the PMDX-106, or if its centered, from > emc. > > Yes, of course, you don't need a servo amp to make the motor reversible, just not clear how well the Chinese motor speed control would handle plug reversing. Since my servo amps handle current limit gracefully, it works pretty well. >>> >> I'm a lot more interested in 4-40 and 6-32 size threads than 1/4". >> > > I might go up to 10-32 or 10-24 for interest, but 4-40/4-48 is about how much > power that spindle has. I suspect without the encoder to pace the feed with, > all I'd do is make more practice sessions of removing broken taps by ED > means. Been there, done that, its a PIMA. :) > Well, I did some test holes in 1/8" aluminum with 10-32, and it worked fine. I could hear the motor slow down a little (right now the system uses a servo amp but it is actually open-loop as for speed control). I did put the gears in the low range speed, I'm pretty sure it would have stalled on the high range. >>> How did you attach the encoder to the micromill spindle? Patented? :) >>> >> No patents for me! Starve the lawyers! >> >> See the last picture here http://pico-systems.com/minimill.html for a >> good view of the encoder and mount/drive. I found some nice plastic >> pulleys in my junk drawer, and an oddball encoder with index. >> > > Ahh, but that's a minimill, not a micromill. I've never gotten this minimill vs. micromill figured out, this is the 150 Lb machine. But, I'd guess a number of machines have something on the upper spindle that could be used to attach a small pulley, similar to what I've done. > >> I also need to figure out how to get an on-screen RPM display. I really >> wanted to work on that at the CNC Workshop, but got distracted. >> >> > The road to hell, Jon. ;-) > > Well, you never know, when starting in on a project. But, I DON'T want to bring the same-old, same-old machine to a show two years in a row.
Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
