On Sunday, April 29, 2012 04:42:35 PM Steve Blackmore did opine: > On Sat, 7 Apr 2012 07:32:21 -0400, you wrote: > > Gene - those lines did wrap, sorry my bad, had set to 72 chars per line > max. > > >Thanks Steve, I'll filter this into mine. But it seems to me, with as > >clean a waveforms as I have going in, that I shouldn't have to slow it > >that much. > > > >I'll have to read up on the lowpass function to see if it defines what > >this "gain" setting means. My copy of the docs, and the online version > >both need better explanations as to what these options passed with setp > >do. > > > >>From its man page: > >PARAMETERS > > > > lowpass.N.gain float rw > > > >NOTES > > > > The effect of a specific gain value is dependant on the period > > of the function that lowpass.N is added to > > > >Gives no clue about what to expect. And dependent is miss-spelled. :) > > Yea - that's not very helpful. Can't remember who sorted it for me, > maybe Jon Elson or Alex Joni. > > My signal looked good too, but was deemed unstable without that mod, I > don't know why as both my Tektronix o'scope and my Thurlby Thandar > frequency counter agreed it was stable and clean. > > >I haven't attempted to connect the spindle controller yet, my box for > >it isn't going to mount cleanly, its wrong size puts the mount holes > >under the lathes controller board. So it looks like I'll have to > >remove the "speedway" label and "goop" it to the front face of the > >existing box. With the wall wart and such parts of its power supply, > >its too big to hide in that cover box. > > > >I should be able to get the motors connected today though, once it > >warms up, there is frost on the pumpkin here this morning.
New controller board as of yesterday, uncalibrated so I had to play with those a bit, and I found one mistake on the LMS supplied hookups for the new, reduced max speed reverse. Their schematic, if followed, restricts the fwd speed, not the reverse. Move the wire solves that. But I am not yet wired for computer controlled reverse. The lowpass, when inspected with halmeter, now shows a +=1 count of 20 rps when running wide open in low gear, supposedly 1200 rpm. But, from the explanation of lowpass, when the spindle is stopped, lowpass's output should degenerate to 0.00000, but it seems stuck at the reading it showed after the last pulse came in, which is well over, plus or minus, the gain set by the setp line. Like its not being clocked at all after the spindle stops. IMO it should update by .01 and multiply the error out to zero in a couple dozen servo thread times. Weird, but not a show stopper. Now, it seems like I need to multiply the speeds step size by about .5 as its only about 7 clicks from 1/4 rps to 20 rps. That is the minus-plus buttons under the spindle stop button, so how can I scale that effect down a bit, or maybe (and this makes more sense) do away with those two buttons in favor of a constant increment or decrement of about .05% per servo- thread as long as the rotate left or right buttons are clicked and held on? Thanks Steve B. & everybody else that is contributing to the 'keep Gene out of the bars' project this seems to have become. ;-) 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> We can defeat gravity. The problem is the paperwork involved. ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
