Re: [Emc-users] Another crazy idea?

2016-01-06 Thread andy pugh
On 6 January 2016 at 02:05, Gene Heskett wrote: > What do you think? Is that a safe and workable idea? I have seen NC SSRs. I don't know how they do it, and they are expensive. I have been using normally-closed mechanical relays to do this, with a 240V coil connected to

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 05:13:34 andy pugh wrote: > On 6 January 2016 at 02:05, Gene Heskett wrote: > > What do you think? Is that a safe and workable idea? > > I have seen NC SSRs. I don't know how they do it, and they are > expensive. > > I have been using

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 02:36:57 Bertho Stultiens wrote: > On 01/06/2016 03:05 AM, Gene Heskett wrote: > [snip] > > > The idea being that when that drain goes low, it will charge the > > .22, thru the diode, essentially maintaining that charge state. But > > when LCNC is stopped, that drain

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread andy pugh
On 6 January 2016 at 14:01, Gene Heskett wrote: >> Ideally it needs to be a force-guided relay, with the main power feed >> (or surrogate thereof) through a second set of terminals > That thought has crossed my mind too, but the power relays I have, with > an aux set of

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 09:21:48 andy pugh wrote: > On 6 January 2016 at 14:01, Gene Heskett wrote: > >> Ideally it needs to be a force-guided relay, with the main power > >> feed (or surrogate thereof) through a second set of terminals > > > > That thought has crossed my

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread andy pugh
On 6 January 2016 at 14:43, Gene Heskett wrote: >> It is _not_ rated to switch 300V DC, so I just ensure it is never >> asked to switch when there is 300V across it. Or, in fact, more than >> 5V. > > Is it big enough to not weld closed forever? It is rated at 6A, so has no

Re: [Emc-users] Resetting rotary movement count [Solved]

2016-01-06 Thread Marcus Bowman
On 5 Jan 2016, at 23:10, Marcus Bowman wrote: > > > On 5 Jan 2016, at 22:48, John Thornton wrote: > >> Just leave the limits out of the ini for the rotary. >> >> http://linuxcnc.org/docs/2.7/html/config/ini-config.html#_axis__lt_num_gt_section >> >> JT > > Thanks, John. I see the emails

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 10:33:58 andy pugh wrote: > On 6 January 2016 at 14:43, Gene Heskett wrote: > >> It is _not_ rated to switch 300V DC, so I just ensure it is never > >> asked to switch when there is 300V across it. Or, in fact, more > >> than 5V. > > > > Is it big

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Bertho Stultiens
On 01/06/2016 10:13 PM, Gene Heskett wrote: [snip] >> This setup is probably also cheaper than using SSRs. > Perhaps, but your parts count is many times what I have in mind. But then again, the components are small and cheap. The setup you described would probably use more space. [snip] > So if

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 17:05:27 Bertho Stultiens wrote: > On 01/06/2016 10:13 PM, Gene Heskett wrote: > [snip] > > >> This setup is probably also cheaper than using SSRs. > > > > Perhaps, but your parts count is many times what I have in mind. > > But then again, the components are small

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Bertho Stultiens
On 01/06/2016 01:54 PM, Gene Heskett wrote: >> When you turn off the machine and the SSR starts to bleed, and then >> turn on the machine before the caps are completely empty, then you >> will have the bleeder load on there permanently. > > Exactly the reason for the forced time delay in the turn

[Emc-users] Denver Maker Faire

2016-01-06 Thread Charles Buckley
Not sure if anyone would be interested, but I noticed the Call For Makers had a theme this year: Our theme for 2016 is Building the Future. We are looking for hands-on, interactive, and/or whiz bang exciting projects. Here are just *some* of the topics that we’re looking for: - Engineering,

Re: [Emc-users] Another crazy idea?

2016-01-06 Thread Gene Heskett
On Wednesday 06 January 2016 15:10:55 Bertho Stultiens wrote: > On 01/06/2016 01:54 PM, Gene Heskett wrote: > >> When you turn off the machine and the SSR starts to bleed, and then > >> turn on the machine before the caps are completely empty, then you > >> will have the bleeder load on there