Re: [Emc-users] nema 24 motors.

2017-01-23 Thread Danny Miller
What drive and system voltage are you using here? Toroids don't make any sense anymore. Switching power supplies DO perform great, unless you overload 'em with BEMF, but a toroid is vulnerable to that too. Specifically Meanwell switching supplies perform reliably. Resonance seems to be

Re: [Emc-users] nema 24 motors.

2017-01-23 Thread Gene Heskett
On Tuesday 24 January 2017 01:11:40 Danny Miller wrote: > Dude, drop the 2-phase bipolar stuff and move to 3 phase! Or at least > DSP drives. > > http://www.ebay.com/itm/Nema-23-3phase-1-8N-m-255ozf-in-stepper-Motor- >57mm-frame-8mm-shaft-57J1285-658-/262562493149?hash=item3d21f1b2dd:g:fM

Re: [Emc-users] iffy question about chuck mounting.

2017-01-23 Thread Erik Christiansen
On 23.01.17 10:34, andy pugh wrote: > On 23 January 2017 at 08:34, Erik Christiansen > wrote: > > but how > > would you grind the inside of jaws clamped on something? > > For a chuck with 2part jaws, this way works: > https://www.youtube.com/watch?v=nALN0qGZbgY > > For

Re: [Emc-users] nema 24 motors.

2017-01-23 Thread Danny Miller
Dude, drop the 2-phase bipolar stuff and move to 3 phase! Or at least DSP drives. http://www.ebay.com/itm/Nema-23-3phase-1-8N-m-255ozf-in-stepper-Motor-57mm-frame-8mm-shaft-57J1285-658-/262562493149?hash=item3d21f1b2dd:g:fMsAAOSwCfdXor7F

[Emc-users] nema 24 motors.

2017-01-23 Thread Gene Heskett
Greetings all; I see some "Nema 24" motors at quite reasonable prices showing up on fleabay, in fairly high torque ratings, so I bought one 10 days back, since I need a stronger one, with perhaps a damper on it on my x axis. I bought the 8 wire model so I can drive it in parallel where I ought

Re: [Emc-users] iffy question about chuck mounting.

2017-01-23 Thread andy pugh
On 23 January 2017 at 08:34, Erik Christiansen wrote: > but how > would you grind the inside of jaws clamped on something? For a chuck with 2part jaws, this way works: https://www.youtube.com/watch?v=nALN0qGZbgY For a solid-jaw chuck there are some pretty clear pictures

Re: [Emc-users] iffy question about chuck mounting.

2017-01-23 Thread Gene Heskett
On Monday 23 January 2017 03:34:23 Erik Christiansen wrote: > On 22.01.17 11:08, Gene Heskett wrote: > > The faceplate hub looks and measures pretty close to cylindrical, > > but it is a rough surfaced forgeing or cast steel surface I am > > looking at, and I'd druther it was trued, which means

Re: [Emc-users] Unable to get 5i24 + 7i48 + 7i44 to work

2017-01-23 Thread Sarah Armstrong
Field power is required for the serial communications to work . So that should solve your problem On Mon, 23 Jan 2017 at 08:51, Viesturs Lācis wrote: > 2017-01-22 16:54 GMT+02:00 Peter C. Wallace : > > > > > > > > > Do you have field voltage supplied

Re: [Emc-users] Unable to get 5i24 + 7i48 + 7i44 to work

2017-01-23 Thread Viesturs Lācis
2017-01-22 16:54 GMT+02:00 Peter C. Wallace : > > > Do you have field voltage supplied to the 7I70 and 7I71? > Not yet, I have it all laid out on a table, just testing to get the initial config right to get the boards working. So field power is needed? Ok, thanks, I will try

Re: [Emc-users] iffy question about chuck mounting.

2017-01-23 Thread Erik Christiansen
On 22.01.17 11:08, Gene Heskett wrote: > The faceplate hub looks and measures pretty close to cylindrical, but > it is a rough surfaced forgeing or cast steel surface I am looking at, > and I'd druther it was trued, which means I'd have to separate it from > the chuck and turn it around on the