Greetings all; I did some more fine tuning of the drivers, making changes in the drivers stepper divider because the scale value was over 50k, so I changed it from 1600/step/rev to 1000, which drops the scale value to 32000 even. Because that motor is geared 2/1 to the 16tpi carriage leadscrew, it seems to be doing around 300 revs at 20 ipm, and is about tapped out.
So I think I have about hit the limit without putting an even bigger nema 34 motor on it and re-rigging for direct drive. Not gonna happen on my watch, not enough of me left anyway. The bigger motor on the carriage however is doing exactly as I feared, it so heavy that its lifting the front end of the carriage just enough that I can see it twisting about 2 thou with the front v-way rising a thou or so to allow this twist before the flat slide at the rear of the carriage starts moving when the direction is reversed. My thoughts are to add a couple small ball bearings, spring loaded against the bottom lip of the V, but at that point I may as well pull the rack because it would be in the way, and figure on driving it only with the motor. And at the same time now that I know what the crossfeed drive needs, bring that motor about 1.6" closer to the back of the carriage as its "out back" by about 3.5" right now. It looks as if my next project might be making hens teeth, a piece for a 1931 Willis Knight's combo light, horn and starter switch. Since this piece is now made out of pure unobtainium and has been for probably 65 years, what (PM me) would you be charging per hour on such a project that can fit nicely in your pocket polo shirts pocket? Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> I'm glad we don't have to play in the shade. -- Golfer Bobby Jones on being told that it was 105 degrees in the shade. ------------------------------------------------------------------------------ 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
